Cement stabilized graded broken stone core sample rapid extraction device
By designing a rapid extraction device for cement-stabilized graded crushed stone core samples, and utilizing an arc-shaped gripper and screw structure, the problem of incomplete core sample extraction was solved, achieving rapid and complete core sample extraction, thus improving detection efficiency and data accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-22
- Publication Date
- 2026-04-14
AI Technical Summary
In the testing of water-stabilized structural layers, it is difficult to extract complete core samples of cement-stabilized graded crushed stone. Existing tools are prone to damaging the core samples, resulting in low testing efficiency and inaccurate data.
A rapid extraction device for cement-stabilized graded crushed stone core samples is designed. It adopts an elastic arc-shaped gripper and screw structure. By rotating the screw, the gripper tightens to clamp the core sample. The elastic element provides clamping force to ensure complete extraction of the core sample.
It enables rapid and complete extraction of core samples, improves detection efficiency, reduces operational difficulty and core sample damage, and ensures the accuracy and standardization of detection data.
Smart Images
Figure CN224122198U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of grasping tools, and in particular to a rapid extraction device for cement-stabilized graded crushed stone core samples. Background Technology
[0002] Cement-stabilized graded crushed stone specifically refers to a stabilized mixture using cement as a binder and graded crushed stone as aggregate. It is one of the most commonly used material types in water-stabilized structural layers. After the construction of the water-stabilized structural layer is completed and the curing period has arrived, to ensure construction quality, core samples of cement-stabilized graded crushed stone need to be tested to assess the quality of the compacted water-stabilized structural layer. The testing indicators are core sample density and compacted layer thickness. Typically, a water-stabilized core drilling machine is used to drill core samples. When drilling reaches the lower structural layer, the machine is stopped and the core barrel is raised, with the core sample being brought out of the hole. Then, the barrel wall is gently tapped with a wooden mallet, and the core sample slides out. However, based on actual field operations, in most cases, the core sample is left in the hole after the core barrel is raised. Currently, simple tools such as clamps are used to retrieve the core sample, but due to the high density of the core sample, it is often damaged during retrieval, resulting in chipped edges and corners. Furthermore, core sample removal is extremely difficult, reducing testing efficiency and making it difficult to reflect the accuracy of the data. Utility Model Content
[0003] In view of this, the present invention provides a rapid extraction device for cement-stabilized graded crushed stone core samples to solve the problem of core sample damage during the extraction process of water-stabilized core samples.
[0004] This utility model is achieved through the following technical solution: a rapid extraction device for core samples of cement-stabilized graded crushed stone, comprising a support plate, a screw, grippers, and elastic elements; the grippers are elastic arc-shaped structures, and several grippers are uniformly fixed to the bottom edge of the support plate, with the height direction of the grippers parallel to the central axis of the support plate; the screw passes through the middle of the support plate and is threaded into the support plate; each gripper is connected to the bottom end of the screw through a corresponding elastic element, and the connection point between the elastic element and the gripper is located in the upper middle part of the gripper; the length of the screw is not less than the height of the gripper, and when the bottom end of the screw and the connection point are on the same horizontal plane, the elastic element is not subjected to force; rotating the screw causes it to move linearly upward along the axis of the support plate, and the elastic element is subjected to tension, causing the free end of the gripper to contract inward to clamp the core sample.
[0005] Furthermore, the support plate has a through hole in the middle, and a nut is fixed to the through hole; the screw consists of a threaded section and a smooth section from top to bottom, and the internal thread of the nut matches the threaded section of the screw.
[0006] Furthermore, the gripper is made of stainless steel, has an arc structure, and the radius of the arc is not less than the radius of the core sample, and the height is not less than the length of the core sample.
[0007] Furthermore, the support plate is a circular steel plate, and the diameter of the support plate is not less than the diameter of the core sample and not greater than the diameter of the core hole.
[0008] Furthermore, the elastic element is a linear spring with the same length as the radius of the support plate.
[0009] Furthermore, a handle is provided at the top of the screw, and the handle adopts a square steel bar structure.
[0010] Compared with existing technologies, the beneficial effects of this utility model are:
[0011] 1. This utility model only requires rotating the screw to tighten the gripper to extract the core sample, making the extraction operation convenient and fast, improving the efficiency of testing and inspection work, avoiding operational problems such as broken cores and incomplete core samples that occur with other gripping tools, reducing the workload of on-site testing operators, and making on-site road engineering testing and inspection work more standardized and convenient.
[0012] 2. The arc-shaped gripper of this utility model cooperates with the side of the core sample to ensure complete extraction of the core sample and prevent it from slipping.
[0013] 3. The screw of this utility model consists of a threaded section and a smooth section from top to bottom. The smooth section can prevent the screw from moving upward and detaching from the support plate. Moreover, compared with traditional clamps, this utility model can be operated by a single person and is simple and quick to operate. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model.
[0015] Figure 2 This is an exploded view of the present invention.
[0016] Figure 3 This is a schematic diagram of the operation of this utility model.
[0017] Among them, 1-handle, 2-screw, 3-nut, 4-support plate, 5-grip, 6-linear spring. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.
[0019] This invention provides a rapid extraction device for cement-stabilized graded crushed stone core samples, such as... Figure 1 As shown, the extraction device includes a support plate 4, a screw 2, a gripper 5, and an elastic element; the gripper 5 has an elastic arc-shaped structure, and several grippers 5 are evenly fixed to the bottom edge of the support plate 4, with the height direction of the gripper 5 parallel to the central axis of the support plate 4.
[0020] The support plate 4 has a through hole in the middle, and a nut 3 is welded into the through hole. The nut 3 can be an M24 type with a height of 50mm. The screw 2 passes through the nut 3 from top to bottom. The internal thread of the nut 3 and the external thread of the screw 2 engage for transmission. Each gripper 5 is connected to the bottom end of the screw 2 through a corresponding elastic element. Each gripper 5 can be connected to one or more elastic elements. The connection point between the elastic element and the gripper 5 is located in the upper middle part of the gripper 5. When the bottom end of the screw 2 and the connection point are on the same horizontal plane, the elastic element is not under force. When the screw 2 is rotated so that it moves upward in a straight line along the axis of the support plate 4, the elastic element is under tension, causing the free end of the gripper 5 to retract inward to clamp the core sample.
[0021] like Figure 2 As shown, the support plate 4 is a circular steel plate, which can be made of Q235 and has a thickness of 5mm. The diameter of the support plate 4 is not less than the diameter of the core sample and not greater than the diameter of the core hole. In this embodiment, the diameter of the circular steel plate is 150mm, so that the gripper 5 can just penetrate into the core hole to grip the core sample.
[0022] The gripper 5 is made of stainless steel with an arc structure and an arc radius not less than the core sample radius. This ensures that the gripper 5 fits snugly against the side of the core sample, allowing for complete extraction from the core extraction hole without slippage. The gripper 5 is 2mm thick and its height is not less than the core sample length. In this embodiment, two grippers 5 are used, each 100mm wide (along the edge of the support plate 4). The two grippers 5 are symmetrically arranged on both sides of the screw 2, with a height of 200mm. When gripping the core sample, the gripper 5 should generally penetrate at least below the core sample's center of gravity, meaning the length of the gripper 5 penetrating the core extraction hole should be greater than half the length of the core sample. For the gripper 5 to penetrate the core extraction hole, it is also necessary to ensure that the connection point between the elastic element and the gripper 5 is above the top of the core sample, and that the connection point is located in the upper middle part of the gripper 5. Therefore, the height of the gripper 5 must be greater than or equal to the core sample length.
[0023] In specific implementation, such as Figure 3 As shown, the gripper 5 penetrates 50-80mm into the core-retrieving hole to grasp the core sample. The connection point between the elastic element and the gripper 5 is located in the middle of the gripper 5, ensuring that the elastic element does not touch the core sample during the entire gripping process. Furthermore, the arc-shaped gripper 5 cooperates with the side of the core sample to ensure that the core sample can be completely removed. The screw 2 can be an M24 model, consisting of a threaded section and a smooth section from top to bottom. The threaded section can be 200mm long, and the smooth section is 50mm long. The smooth section prevents the screw from moving upward and detaching from the support plate 4.
[0024] The elastic element is a linear spring 6. In this embodiment, the linear spring 6 has a wire diameter of 5mm and an outer diameter of 30mm, and ensures that the elastic force generated by the extension of the linear spring 6 when the screw 2 is rotated can pull the gripper 5. The length of the linear spring 6 is the same as the radius of the circular steel plate, and the length is 75mm, which ensures that the linear spring 6 is not under force when the bottom end of the screw 2 is at the same horizontal plane as the connection point between the elastic element and the gripper 5.
[0025] The top of the screw 2 can also be equipped with a handle 1. The handle 1 adopts a square steel bar structure, with the middle of the square steel bar welded to the top of the screw 2. For ease of operation, the length of the handle 1 can be 150mm.
[0026] When using this extraction device, check that all parts are securely connected and that the screw 2 can slide smoothly within the nut 3; clean the debris around the core sampling hole to ensure sufficient space for installation and operation of the extraction device; position the extraction device perpendicular to the core sampling hole, align the screw 2 with the center of the hole, and slowly lower the extraction device so that the gripper 5 reaches the predetermined gripping position of the core sample (generally the lower middle part of the core sample); rotate the handle 1 at a uniform speed to make the gripper 5 hold the core sample tightly, and feel that the contact force between the gripper 5 and the core sample is moderate to ensure a firm grip; lift the extraction device so that the core sample is taken out of the core sampling hole along with the extraction device; place the extracted core sample in the designated storage location, release the handle 1 to open the gripper 5, and remove the core sample.
[0027] This invention can be applied to core sampling of water-stabilized layers in highways of all grades and township and municipal road projects. It can effectively improve the testing efficiency of on-site testing personnel, ensure the timeliness and accuracy of test data, and effectively guide on-site construction.
[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A rapid extraction device for cement-stabilized graded crushed stone core samples, characterized in that, It includes a support plate, a screw, grippers, and elastic elements; the grippers are elastic arc-shaped structures, and several grippers are evenly fixed to the bottom edge of the support plate. The height direction of the grippers is parallel to the central axis of the support plate. The screw passes through the middle of the support plate and is threaded into the support plate. Each gripper is connected to the bottom end of the screw through a corresponding elastic element. The connection point between the elastic element and the gripper is located in the upper middle part of the gripper. When the length of the screw is not less than the height of the gripper, and the bottom end of the screw is on the same horizontal plane as the connection point, the elastic element is not subjected to force; when the screw is rotated to make it move upward in a straight line along the axis of the support plate, the elastic element is subjected to tension, causing the free end of the gripper to retract inward to clamp the core sample.
2. The rapid extraction device for cement-stabilized graded crushed stone core samples as described in claim 1, characterized in that, The support plate has a through hole in the middle, and a nut is fixed in the through hole; the screw consists of a threaded section and a smooth section from top to bottom, and the internal thread of the nut matches the threaded section of the screw.
3. The rapid extraction device for cement-stabilized graded crushed stone core samples as described in claim 1, characterized in that, The gripper is made of stainless steel, has an arc structure, and the radius of the arc is not less than the radius of the core sample, and the height is not less than the length of the core sample.
4. The rapid extraction device for cement-stabilized graded crushed stone core samples as described in claim 1, characterized in that, The support plate is a circular steel plate with a diameter not less than the core sample diameter and not greater than the core hole diameter.
5. The rapid extraction device for cement-stabilized graded crushed stone core samples as described in claim 4, characterized in that, The elastic element is a linear spring with the same length as the radius of the support plate.
6. The rapid extraction device for cement-stabilized graded crushed stone core samples as described in any one of claims 1-5, characterized in that, A handle is provided at the top of the screw, and the handle is a square steel bar structure.