Automatic hammer count recorder for standard penetration test

Abstract

The utility model provides an automatic recorder for the number of hammers in a standard penetration test, which belongs to the technical field of engineering survey equipment and comprises a shell, a semicircular magnet, a concave rotating wheel, a line wheel, a slide rod, a slide block, a first traction rope, a limiting piece, a first elastic piece, a second traction rope, an elastic trigger and a triple counter. According to the utility model, the vertical displacement of the drill rod is converted into the transverse displacement of the sliding block by adopting the concave rotating wheel in close contact with the drill rod and the first traction rope, and the triple counter at the lower part is triggered by the elastic trigger on the sliding block, so that the automatic segmented counting of a standard penetration test is realized. When the penetration depth of the standard penetration test is completed, the elastic trigger triggers the buzzer to remind an operator to end the test. According to the utility model, errors caused by manual line drawing and counting can be reduced, the test precision is improved, counting errors are avoided, manual counting procedures are reduced, the efficiency is improved, and the influence of human factors on the test accuracy is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of engineering survey equipment, and more specifically, it relates to an automatic recorder for the number of hammer blows in a standard penetration test. Background Technology

[0002] Standard penetration testing (SPT) is one of the most widely used in-situ testing methods in engineering geological exploration. During the test, the SPT apparatus is attached to the drill pipe and lowered to the bottom of the borehole, where a standard penetration hammer is connected at the surface. Before hammering, markings of 15 cm, 10 cm, 10 cm, and 10 cm are drawn on the drill pipe above ground, using a reference plane. In actual drilling operations, it is common practice to use a finger dipped in drilling rig lubricant or water to draw the markings on the drill pipe; a more standardized method is to use chalk.

[0003] The method of using fingers dipped in drilling lubricant or water, or drawing graduation lines on the drill rod with chalk, results in relatively wide (1-2 cm) lines, poor accuracy, and large errors. When counting, the standard penetration test hammer blows are counted manually. The first 15 cm of penetration is not counted, and then every 10 cm of penetration is counted. This method has low automation, is cumbersome, and prone to errors.

[0004] Therefore, it is necessary to develop an auxiliary counting device that automatically records the number of hammer blows per 10 cm penetration. Utility Model Content

[0005] The purpose of this invention is to provide an automatic hammer blow count recorder for standard penetration tests, so as to improve the counting accuracy of standard penetration tests, reduce human error or error, reduce manual counting procedures, and reduce the workload of operators.

[0006] To achieve the above objectives, this utility model provides an automatic recorder for the number of hammer blows in a standard penetration test, comprising:

[0007] The housing includes two opposing side panels;

[0008] A semi-annular magnet is fixedly connected to the housing.

[0009] The concave rotating wheel has an arc-shaped concave surface; the two ends of the concave rotating wheel are rotatably connected to the two side plates through a rotating shaft; the arc-shaped concave surface and the concave surface of the semi-annular magnet are in contact with the outer wall of the drill rod; the center of the arc-shaped concave surface and the center of the semi-annular magnet are arranged on the same axis.

[0010] A reel is coaxially connected to the shaft with the concave reel;

[0011] A sliding rod, the two ends of which are fixedly connected to the two side plates;

[0012] The slider is slidably connected to the slide rod;

[0013] The first traction rope has its upper end wound around the reel and its lower end fixedly connected to the slider.

[0014] A limiting member is fixedly connected to one of the side plates; the limiting member is provided with a first threading hole;

[0015] The first elastic element has one end fixedly connected to the other side plate;

[0016] The second traction rope has one end passing through the first threading hole and fixedly connected to the slider, and the other end being fixedly connected to the first elastic element.

[0017] An elastic trigger, the upper end of which is fixedly connected to the slider; and,

[0018] A triple counter is disposed below the elastic trigger and close to one side of the side plate; the triple counter is fixedly connected to the housing.

[0019] Furthermore, the elastic trigger includes a first connecting rod, a second elastic element, and a trigger end connected in sequence. The first connecting rod is fixedly connected to the slider, and the trigger end is used to trigger the triple counter to count.

[0020] Furthermore, it also includes a buzzer, which is fixedly connected to the side plate near the triple counter, and the trigger terminal triggers the buzzer to emit an alarm by conducting the buzzer circuit.

[0021] Furthermore, the first elastic element has a second threading hole on the side near the side plate, and the lower end of the first traction rope passes through the second threading hole and is fixedly connected to the slider.

[0022] Furthermore, two semi-annular magnets are symmetrically arranged in the vertical direction.

[0023] Furthermore, the triple counter is equipped with a reset button.

[0024] Furthermore, the housing also includes a connecting plate connected between the two side plates.

[0025] Furthermore, the first elastic element is an elastic rubber strip.

[0026] Furthermore, the second elastic element is a spring.

[0027] Furthermore, the concave rotating wheel is a rubber wheel.

[0028] Compared with the prior art, the present invention has the following technical effects:

[0029] This invention relates to an automatic hammer blow count recorder for a standard penetration test. The device is attached to the drill rod by a semi-circular magnet. The rotation of a concave wheel drives a first traction rope to wind around a spool, which in turn pulls a slider along a slide rod. This causes an elastic trigger connected to the lower end of the slider to automatically count the blows when struck by the hammer. This invention reduces errors caused by manual marking and counting, improves test accuracy, avoids counting errors, reduces manual counting steps, increases efficiency, and minimizes the impact of human factors on test accuracy. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the overall structure of an automatic hammer blow count recorder for a standard penetration test provided in this embodiment of the present invention;

[0032] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point A-A';

[0033] Figure 3 for Figure 1 A partially enlarged structural diagram of the first and second traction ropes in the middle section;

[0034] Figure 4 for Figure 1 A schematic diagram of the structure of a flexible trigger.

[0035] The following are the labeling elements in the figure:

[0036] 1. Housing; 2. Semi-annular magnet; 3. Concave wheel; 4. Shaft; 5. Threaded wheel; 6. Slide bar; 7. Slider; 8. First traction rope; 9. Limiting element; 10. First elastic element; 11. Second traction rope; 12. Elastic trigger; 13. Triple counter; 14. Buzzer; 15. Reset button; 16. Partition; 17. Adhesive; 101. Side plate; 102. Connecting plate; 1201. First connecting rod; 1202. Second elastic element; 1203. Trigger end. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects 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 merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0039] It should be understood that the terms "length", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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.

[0040] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The singular forms “a,” “the,” and “the” used in the embodiments of this utility model and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0041] The terms "first" and "second" are used for descriptive purposes only, to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, without departing from the scope of the embodiments of this utility model, "first" may also be referred to as "second," and similarly, "second" may also be referred to as "first." Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0042] Please see Figures 1-4 The present invention will now describe an automatic recorder for the number of hammer blows in a standard penetration test provided by an embodiment of the present invention.

[0043] In one embodiment of this utility model, an automatic recorder for the number of hammer blows in a standard penetration test includes: a housing 1, a semi-annular magnet 2, a concave rotating wheel 3, a spool 5, a slide rod 6, a slider 7, a first traction rope 8, a limiting member 9, a first elastic member 10, a second traction rope 11, an elastic trigger 12, and a triple counter 13. The housing 1 includes two opposing side plates 101, and the semi-annular magnet 2 is fixedly connected to the housing 1. The concave rotating wheel 3 has an arc-shaped concave surface; both ends of the concave rotating wheel 3 are rotatably connected to the two side plates 101 via a rotating shaft 4. The arc-shaped concave surface and the concave surface of the semi-annular magnet 2 are in contact with the outer wall of the drill rod, and the center of the arc-shaped concave surface is coaxially aligned with the center of the semi-annular magnet 2. The spool 5 is coaxially connected to the concave rotating wheel 3 on the rotating shaft 4. Both ends of the slide rod 6 are fixedly connected to the two side plates 101. The slider 7 is slidably connected to the slide rod 6. The upper end of the first traction rope 8 is wound around... The upper end of the first elastic element 10 is fixedly connected to the slider 7 and the lower end is fixedly connected to the pulley 5. The limiting element 9 is fixedly connected to a side plate 101. The limiting element 9 is provided with a first threading hole. One end of the first elastic element 10 is fixedly connected to another side plate 101. One end of the second traction rope 11 passes through the first threading hole and is fixedly connected to the slider 7, and the other end is fixedly connected to the first elastic element 10. The upper end of the elastic trigger 12 is fixedly connected to the slider 7. The triple counter 13 is located below the elastic trigger 12 and close to one side plate 101. The triple counter 13 is fixedly connected to the housing 1.

[0044] In this embodiment, as Figure 1 , Figure 2 As shown, the left side of the semi-annular magnet 2 is connected to the left side plate 101 of the housing 1, and the right side is connected to the partition plate 16. The partition plate 16 is connected to the connecting plate 102 of the housing 1. The connecting plate 102 connects the left and right side plates 101. Thus, the housing 1 is composed of two side plates 101 and a connecting plate 102 connecting the two side plates 101. The housing 1 can be welded from steel plates. One end of the partition plate 16 is welded to the connecting plate 102. The semi-annular magnet 2, the housing 1, and the partition plate 16 can be connected together using an adhesive 17. In one embodiment, the housing 1 may not have a connecting plate 102. However, the addition of a connecting plate 102 makes the overall structure of the housing 1 more stable and facilitates the fixing and connection of other components within the housing 1.

[0045] The concave surface of the semi-annular magnet 2 faces the drill rod, and its diameter is approximately the same as the drill rod diameter. This ensures that the concave surface of the semi-annular magnet 2 fits snugly against the outer wall of the drill rod during use. The magnetic attraction between the semi-annular magnet 2 and the drill rod allows the entire device to be fixed to the outer wall of the drill rod. Preferably, two semi-annular magnets 2 are symmetrically arranged in the vertical direction, one at the top and one at the bottom of the housing 1. The two semi-annular magnets 2 provide a more stable fixation to the outer wall of the drill rod. The semi-annular magnets 2 are located on the left side inside the housing 1. This magnetic attraction method allows the device to be quickly assembled onto the drill rod during the penetration test and quickly removed after the test.

[0046] The concave rotating wheel 3 and the thread reel 5 are coaxially arranged, meaning that when the concave rotating wheel 3 rotates, it can synchronously drive the rotating shaft 4 and the thread reel 5 to rotate. Preferably, the concave rotating wheel 3 is a rubber wheel, which has a large friction force. Thus, when the concave rotating wheel 3 is in close contact with the drill rod and the drill rod moves downward, it drives the concave rotating wheel 3 to rotate, and the thread reel 5, which is coaxial with the concave rotating wheel 3, also rotates together. This causes the first traction rope 8 to wind around the thread reel 5, and at the same time pulls the slider 7 to slide from left to right along the slide rod 6.

[0047] The first elastic element 10 is horizontally arranged on the right side of the housing 1, with its right end fixedly connected to the right side plate 101 and its left end connected to the second traction rope 11. During the standard penetration test, the drill rod moves downward, causing the concave wheel 3 to rotate, and the spool 5, which is coaxial with the concave wheel 3, also rotates. The first traction rope 8 is wound around the spool 5, causing the slider 7 to move to the right, and the first elastic element 10 is stretched. After the standard penetration test, the device is removed from the drill rod, the resistance acting on the concave wheel 3 disappears, the first elastic element 10 contracts, and the slider 7 returns to its original position. In one embodiment, the first elastic element 10 is an elastic rubber strip or a spring. When the first elastic element 10 is an elastic rubber strip, preferably, the side of the first elastic element 10 closest to the right side plate 101 is provided with a second threading hole. The lower end of the first traction rope 8 passes through the second threading hole and is fixedly connected to the slider 7. The movement path of the first traction rope 8 can be limited through the second threading hole.

[0048] In one embodiment, the slide bar 6 is a horizontal circular steel column with a diameter of 10 mm, horizontally arranged below the first elastic element 10, providing a track for the slider 7 to slide. The slider 7 is annular, fitted onto the slide bar 6, located on the left side of the device. The slide bar 6 is located within the central ring of the annular slider 7, guiding its movement. The upper part of the slider 7 is fixedly connected to the first traction rope 8 and the second traction rope 11, and the lower part is fixed to the elastic trigger 12. During the standard penetration test, due to the rotation of the concave wheel 3, it moves to the right under the tension of the first traction rope 8; after the test, it moves to the left and resets to the left end of the slide bar 6 under the tension of the first elastic element 10 and the second traction rope 11.

[0049] The first traction rope 8 and the second traction rope 11 are the central nerves of this device, which convert the downward displacement of the drill rod into the horizontal displacement of the slider 7. The first traction rope 8 and the second traction rope 11 should preferably be thin ropes with small deformation under stress.

[0050] The elastic trigger 12 is vertically arranged and fixed to the lower part of the slider 7. As the slider 7 moves, the elastic trigger 12 has a vertically arranged second elastic element 1202. Under the impact of the standard penetrating hammer, the vertically arranged second elastic element 1202 extends, allowing the elastic trigger 12 to strike the trigger counting part of the triple counter 13 below it. In one embodiment, the elastic trigger 12 includes a first connecting rod 1201, a second elastic element 1202, and a trigger end 1203 connected in sequence. The first connecting rod 1201 is fixedly connected to the slider 7, and the trigger end 1203 is used to trigger the triple counter 13 to count. Specifically, both the first connecting rod 1201 and the trigger end 1203 are steel columns with a diameter of 5–10 mm. The second elastic element 1202 is preferably a spring connecting the upper and lower sections of the steel column.

[0051] The triple counter 13 is horizontally arranged below the elastic trigger 12, located on the right side of the device, with a certain distance between its left side and the left side plate 101 of the housing 1. A horizontal support plate can be connected inside the housing 1, and the triple counter 13 is placed on the horizontal support plate and fixed to it with screws. When the standard penetration test penetrates the upper 15 cm (the section not to be counted), the elastic trigger 12 moves in the empty area on the left. When the standard penetration test penetrates the first 10 cm, the elastic trigger 12 moves above the trigger on the left side of the triple counter 13; when the standard penetration test penetrates the second 10 cm, the elastic trigger 12 moves above the trigger in the middle of the triple counter 13; when the standard penetration test penetrates the third 10 cm, the elastic trigger 12 moves above the trigger on the right side of the triple counter 13. For each hammer blow in the standard penetration test, the elastic trigger 12 triggers the corresponding counter once. The left, middle, and right triggers of the triple counter 13 are sequentially abutted on the same horizontal plane, and the total length of the three triggers of the triple counter 13 is equal to the distance traveled by the first traction rope 8. Preferably, a reset button 15 is provided on the right side of the triple counter 13 to reset the triple counter 13 to zero after each count.

[0052] In use, the concave surface of the concave wheel 3 and the concave surface of the semi-annular magnet 2 are both in contact with the outer wall of the drill rod. The function of the semi-annular magnet 2 is to fix the entire device to the outer wall of the drill rod. The function of the concave wheel 3 is to rotate when the drill rod moves downward, using the friction between it and the drill rod, thereby driving the rotating shaft 4 and the reel 5 to rotate, so that the first traction rope 8 drives the annular slider 7 to slide. That is, this device uses the concave wheel 3 and the first traction rope 8, which are in close contact with the drill rod, to convert the vertical displacement of the drill rod into the lateral displacement of the annular slider 7. The elastic trigger 12 on the annular slider 7 triggers the triple counter 13 at the bottom to realize the automatic segmented counting of the standard penetration test. In one embodiment, the inner diameter of the concave surface of the concave wheel 3 and the concave surface of the semi-annular magnet 2 is 42.5 mm, and the concave wheel 3 and the semi-annular magnet 2 are both located on the same side of the drill rod.

[0053] Furthermore, the automatic recorder of this utility model also includes a buzzer 14, which is fixedly connected to a side plate 101 near the triple counter 13. The trigger end 1203 of the elastic trigger 12 triggers the buzzer 14 to sound an alarm by activating the buzzer 14 circuit. In one embodiment, the buzzer 14 is located on the upper part of the triple counter 13 and connected to the right side plate 101. When the standard penetration test penetration depth reaches the penetration depth (45 cm), the elastic trigger 12 moves to the trigger position of the buzzer 14, triggering the buzzer 14 to remind the operator that the test can be ended.

[0054] The automatic recorder of this utility model embodiment can be used in the following way:

[0055] 1) After the standard penetration tester is connected to the drill rod and lowered to the bottom of the borehole, the device is secured to the drill rod above the ground using its semi-circular magnet 2. The bottom of the device is placed on the crossbar above the borehole. During the standard penetration test, ensure that the device does not move downward with the drill rod.

[0056] 2) When the standard penetration test is completed, first read the number of penetration blows of each section from the triple counter 13 and record it, then remove this device from the drill pipe.

[0057] 3) Press the reset button 15 of the triple counter 13 to reset the counter to zero for easy use next time.

[0058] An automatic hammer blow count recorder for a standard penetration test according to this invention uses a semi-annular magnet 2 to attach the device to the drill rod. The rotation of the concave wheel 3 drives the first traction rope 8 to wind around the reel 5, which in turn pulls the annular slider 7 along the slide rod 6. This causes the elastic trigger 12 connected to the lower end of the annular slider 7 to automatically count segments under hammer impact, triggering the lower triple counter 13. When the standard penetration test reaches the required penetration depth, the elastic trigger 12 activates the buzzer 14 to remind the operator to end the test. This invention reduces errors caused by manual marking and counting, improves test accuracy, avoids counting errors, reduces manual counting procedures, increases efficiency, and reduces the impact of human factors on test accuracy.

[0059] An automatic hammer blow recorder for standard penetration tests according to an embodiment of this utility model has an auxiliary counting function that automatically records the number of hammer blows per 10 cm penetration, but it is not applicable to fluid plastic or soft plastic formations where the number of hammer blows per 10 cm penetration is less than 1.

[0060] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An automatic hammer blow count recorder for a standard penetration test, characterized in that, include: The housing includes two opposing side panels; A semi-annular magnet is fixedly connected to the housing. The concave rotating wheel has an arc-shaped concave surface; the two ends of the concave rotating wheel are rotatably connected to the two side plates through a rotating shaft; the arc-shaped concave surface and the concave surface of the semi-annular magnet are in contact with the outer wall of the drill rod; the center of the arc-shaped concave surface and the center of the semi-annular magnet are arranged on the same axis. A reel is coaxially connected to the shaft with the concave reel; A sliding rod, the two ends of which are fixedly connected to the two side plates; The slider is slidably connected to the slide rod; The first traction rope has its upper end wound around the reel and its lower end fixedly connected to the slider. A limiting member is fixedly connected to one of the side plates; the limiting member is provided with a first threading hole; The first elastic element has one end fixedly connected to the other side plate; The second traction rope has one end passing through the first threading hole and fixedly connected to the slider, and the other end being fixedly connected to the first elastic element. An elastic trigger, the upper end of which is fixedly connected to the slider; and, A triple counter is disposed below the elastic trigger and close to one side of the side plate; the triple counter is fixedly connected to the housing.

2. The automatic hammer blow count recorder for standard penetration test as described in claim 1, characterized in that, The elastic trigger includes a first connecting rod, a second elastic element, and a trigger end connected in sequence. The first connecting rod is fixedly connected to the slider, and the trigger end is used to trigger the triple counter to count.

3. The automatic hammer blow count recorder for standard penetration test as described in claim 2, characterized in that, It also includes a buzzer, which is fixedly connected to the side plate near the triple counter, and the trigger terminal triggers the buzzer to sound an alarm by activating the buzzer circuit.

4. The automatic hammer blow count recorder for a standard penetration test as described in claim 1, characterized in that, The first elastic element has a second threading hole on the side near the side plate, and the lower end of the first traction rope passes through the second threading hole and is fixedly connected to the slider.

5. The automatic hammer blow count recorder for a standard penetration test as described in claim 1, characterized in that, Two semi-circular magnets are symmetrically arranged in the vertical direction.

6. The automatic hammer blow count recorder for a standard penetration test as described in claim 1, characterized in that, The triple counter is equipped with a reset button.

7. The automatic hammer blow count recorder for a standard penetration test as described in claim 1, characterized in that, The housing also includes a connecting plate that connects the two side plates.

8. An automatic hammer blow count recorder for a standard penetration test as described in any one of claims 1-7, characterized in that, The first elastic element is an elastic rubber strip or a spring.

9. An automatic hammer blow count recorder for a standard penetration test as described in claim 2 or 3, characterized in that, The second elastic element is a spring.

10. An automatic hammer blow count recorder for a standard penetration test as described in any one of claims 1-7, characterized in that, The concave rotating wheel is a rubber wheel.

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