Convenient testing device for compactness of silty-fine sand soil in aeolian sand area

Abstract

The utility model discloses a convenient testing device for the compactness of silty-fine sand soil in an aeolian sand area, which goes deep into an exploration hole formed by a Luoyang shovel for testing and comprises a drill rod assembly and a cross plate assembly, the drill rod assembly comprises a rotating handle, a plurality of standard drill rod sections and a drill rod with gradually-changed sections which are detachably connected in sequence, and the standard drill rod sections are spliced one by one in the length direction; the cross plate assembly comprises a shaft rod and a cross plate stainless steel sheet, the shaft rod is detachably connected to the drill rod with the gradually-changed section, the cross plate stainless steel sheet is fixed around the shaft rod in the length direction to be in a cross shape, and a cross plate blade foot is arranged at the bottom of the cross plate stainless steel sheet and used for cutting sandy soil in the vertical direction and driving the cross plate assembly to be vertically pressed into a sandy soil layer. And the test position is reached. The testing device is simple in structure and easy and convenient to operate, has the advantages of being high in testing efficiency and accuracy, low in operation safety risk and high in applicability to traffic conditions of various exploration sites.

Description

TECHNICAL FIELD

[0001] The utility model relates to in situ testing technical field, concretely relates to a kind of for aeolian sand area fine sand soil compactness convenient testing device. BACKGROUND

[0002] In the engineering construction of aeolian sand area, the compactness of sand is an important parameter, and it is an important basis for selecting the characteristic value of the bearing capacity of building foundation. It has guiding significance for the selection of design scheme and investment cost of engineering construction.

[0003] Currently, the main methods for testing the compactness of sand are in-situ testing and laboratory testing methods, including static cone penetration test, dynamic cone penetration test, standard penetration test, and relative compactness test. The most widely used method is in-situ testing.

[0004] In the aeolian sand area, taking the Mawusu Desert in northern Shaanxi as an example, there is a large amount of fine sand on the surface. Due to the particularity of the power industry, power transmission towers, photovoltaic power generation foundations, wind power generation foundations, and substation sites are mostly located in desolate areas where transportation tools cannot directly reach the site. Traditional in-situ testing equipment for sand compactness, such as static cone penetration test, dynamic cone penetration test, and standard penetration test, is mostly heavy and bulky. Therefore, it is neither practical nor economical for sites with poor transportation conditions.

[0005] Therefore, for the discrimination and division of the compactness of fine sand soil in the foundation, it is urgent to use a convenient device for testing, which can ensure the accuracy of the discrimination of sand compactness and is convenient for manual carrying and operation. UTILITY MODEL CONTENT

[0006] The utility model provides a simple structure, easy operation, high testing efficiency, low safety risk, and strong adaptability to transportation conditions for the compactness of fine sand soil in aeolian sand area, which can at least solve one of the above technical problems.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A convenient testing device for the compactness of fine sand soil in aeolian sand area, which is tested by drilling into the exploration hole formed by a Luoyang shovel, includes a drill rod assembly and a cross plate assembly.

[0009] The drill rod assembly includes a rotating handle, standard drill rod segments and a cross-section gradually changing drill rod connected in sequence, the standard drill rod segments have multiple segments connected one by one along the length direction.

[0010] The cross plate assembly comprises a shaft and a cross plate stainless steel sheet, the shaft is detachably connected to the cross-sectionally tapered drill rod, the cross plate stainless steel sheet is fixed in a cross shape along the length direction around the shaft, and the bottom is provided with a cross plate blade foot for vertically cutting the sandy soil and driving the cross plate assembly to be vertically pressed into the sandy soil layer until reaching the test position.

[0011] Further, the drill rod assembly is integrally made of solid steel material, the rotating handle is welded with the adjacent standard drill rod segment, and the adjacent two standard drill rod segments and the cross-sectionally tapered drill rod and the adjacent standard drill rod segment are respectively connected through connecting threaded heads.

[0012] Further, the cross plate assembly is integrally made of stainless steel material, the shaft is a cylindrical shape with a top thick bottom thin structure and a non-uniform diameter, the caliber of the top of the shaft is matched with the caliber of the bottom of the cross-sectionally tapered drill rod, the length of the cross plate stainless steel sheet is consistent with the length of the shaft, and the cutout of the cross plate blade foot is vertically downward.

[0013] Further, the depth of the exploration hole is a predetermined hole depth reached after the loyang shovel forms a hole, after the cross plate blade foot penetrates the exploration hole, the sandy soil is continuously cut downward until reaching the test position, and the rotating handle is horizontally rotated to apply a torque.

[0014] Further, the triangular support frame is detachably sleeved on the outside of the drill rod assembly and is erected on the ground outside the exploration hole, and is used for limiting and supporting the drill rod assembly.

[0015] Further, the triangular support frame comprises a support tray and support legs, the center of the support tray is provided with a limiting hole for penetrating the standard drill rod segment, the support tray is horizontally arranged, the support legs are three, are uniformly distributed at the bottom of the support tray, the support legs are hinged to the support tray through the hinge shaft at the top, and are abutted to the ground through the antiskid boots at the bottom.

[0016] Further, the detection assembly comprises a torque measurement sensor, a data transmission line and a data acquisition instrument, the torque measurement sensor is installed on the rotating handle and is connected to the data acquisition instrument through the data transmission line.

[0017] The beneficial effects of the utility model are embodied in:

[0018] This invention utilizes a convenient testing device with a cross-plate assembly to test the density of fine sand. This device not only accurately and efficiently tests the density of sand, but also makes the sand density test more convenient due to its simple structure and ease of disassembly and transport. It also has the advantages of low operational safety risk and strong adaptability to different exploration site traffic conditions, effectively overcoming the shortcomings of existing methods for testing the density of fine sand in aeolian sandy areas. Attached Figure Description

[0019] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0021] Figure 2 This is a schematic diagram of the connecting thread head structure according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the triangular support frame structure according to an embodiment of the present utility model.

[0023] Figure 4 This is a schematic diagram of the cross plate assembly structure according to an embodiment of the present utility model.

[0024] The components in the attached diagram are labeled as follows: 1. Drill pipe assembly; 2. Rotary handle; 3. Standard drill pipe segment; 4. Gradient cross-section drill pipe; 5. Connecting threaded head; 6. Triangular support frame; 7. Support tray; 8. Support leg; 801. Hinge shaft; 802. Anti-slip shoe; 9. Cross plate assembly; 10. Shaft; 11. Stainless steel cross plate sheet; 12. Cross plate cutting edge; 13. Detection assembly; 14. Torque measurement sensor; 15. Data transmission line; 16. Data acquisition instrument; 17. Ground; 18. Exploration hole. Detailed Implementation

[0025] 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 a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0026] It should be noted that if any directional indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0027] See Figure 1 and Figure 4 This utility model embodiment provides a convenient testing device for the compaction of fine sand in aeolian sandy areas, which is inserted into the exploration hole 18 formed by the Luoyang shovel for testing, including a drill rod assembly 1 and a cross plate assembly 9;

[0028] The drill pipe assembly 1 includes a rotary handle 2, a standard drill pipe segment 3 and a drill pipe with a gradually changing cross section that are detachably connected in sequence. The standard drill pipe segment 3 has multiple segments that are spliced ​​together one by one along the length direction.

[0029] The cross plate assembly 9 includes a shaft 10 and a cross plate stainless steel sheet 11. The shaft 10 is detachably connected to the cross section gradually changing drill rod 4. The cross plate stainless steel sheet 11 is fixed in a cross shape around the shaft 10 along the length direction, and has a cross plate cutting foot 12 at the bottom. The cross plate cutting foot 12 is used to cut sand in the vertical direction and drive the cross plate assembly 9 to be vertically pressed into the sand layer until the test position is reached.

[0030] See Figure 1 and Figure 2 In this embodiment, the drill pipe assembly 1 is made of solid steel. The rotary handle 2 is welded to the adjacent standard drill pipe segment 3. The two adjacent standard drill pipe segments 3 and the cross-section gradually changing drill pipe 4 are respectively connected to the adjacent standard drill pipe segment 3 by connecting threaded heads 5.

[0031] In this design, the rotating handle 2 is positioned horizontally or inclined at the top of the standard drill pipe segment 3, mainly to apply torque. The standard drill pipe segment 3 is a cylindrical shape with a uniform diameter and comes in various lengths to meet exploration tasks at different underground depths. The cross-section tapered drill pipe 4 is a cylindrical shape with a thicker top and a thinner bottom and a non-uniform diameter, which facilitates smooth penetration into the exploration hole 18 and reduces travel resistance. The connecting threaded head 5 has an internal threaded groove structure and an external protruding threaded joint structure, which are respectively located at both ends of the standard drill pipe segment 3 or the cross-section tapered drill pipe 4 for easy installation and disassembly.

[0032] In one implementation case, the diameter of the rotating handle 2 is 20mm and the length is 300mm, the diameter of the standard drill pipe segment 3 is 20mm and the standard length is 1m, the length of the cross-section gradually changing drill pipe 4 is 0.5m, the upper diameter is 20mm and the lower diameter is 10mm, and the overall diameter transitions from top to bottom.

[0033] See Figure 1 and Figure 4 In this embodiment, the cross plate assembly 9 is made of stainless steel. The shaft 10 is cylindrical with a thicker top and a thinner bottom, and the diameter is not uniform. The diameter of the top of the shaft 10 matches the diameter of the bottom of the cross-section gradually changing drill rod 4. The length of the cross plate stainless steel sheet 11 is the same as the length of the shaft 10. The cutting edge of the cross plate cutting foot 12 is vertically downward.

[0034] With this design, the material and structure of the cross plate assembly 9 can effectively reduce the friction with the sand and soil during the soil insertion process, ensuring smooth sinking and deep penetration.

[0035] In one implementation, the shaft 10 has a length of 100mm, the upper part (70mm) of the shaft has a diameter of 10mm, the lower part (30mm) of the shaft has a diameter of 5mm, the cross-shaped stainless steel sheet 11 is rectangular, has a length of 100mm, a thickness of 3mm, and the cylinder formed by rotating around the shaft 10 has a diameter of 50mm.

[0036] See Figure 1 In this embodiment, the depth of the exploration hole 18 is the predetermined hole depth reached after the Luoyang shovel makes the hole. After the cross blade foot 12 passes through the exploration hole 18, it continues to cut the sand and soil downward until it reaches the test position. The torque is applied by the horizontal rotation of the rotating handle 2.

[0037] See Figure 1 and Figure 3In this embodiment, a triangular support frame 6 is also included. The triangular support frame 6 is detachably fitted onto the outside of the drill rod assembly 1 and erected on the ground 17 outside the opening of the exploration hole 18, for limiting and supporting the drill rod assembly 1.

[0038] The triangular support frame 6 includes a support tray 7 and support legs 8. The center of the support tray 7 has a limiting hole for the standard drill rod segment 3 to pass through. The support tray 7 is horizontally arranged. There are three support legs 8, which are evenly distributed on the bottom of the support tray 7. The support legs 8 are hinged to the support tray 7 via a hinge shaft 801 at the top and contact the ground 17 via an anti-slip boot 802 at the bottom.

[0039] With this design, the triangular support frame 6 ensures that the drill rod assembly 1 remains perpendicular to the ground 17 and does not tilt or lean during the sinking process. The outer diameter of the standard drill rod segment 3 and the cross-section gradually changing drill rod 4 matches the inner diameter of the limiting hole and can slide along the limiting hole.

[0040] In one implementation example, the diameter of the limiting hole is ±0.5mm of the diameter of the standard drill rod segment 3.

[0041] See Figure 1 In this embodiment, a detection component 13 is also included. The detection component 13 includes a torque measurement sensor 14, a data transmission line 15, and a data acquisition device 16. The torque measurement sensor 14 is mounted on the rotating handle 2 and connected to the data acquisition device 16 via the data transmission line 15.

[0042] With this design, the torque measuring sensor 14 is mainly used to measure the torque generated by the rotating handle 2 during rotation. After the cross blade foot 12 drives the cross blade assembly 9 to cut the sand layer vertically downward to the test position, the rotating handle 2 is rotated horizontally to apply torque to the cross blade assembly 9. The torque measuring sensor 14 measures the torsional resistance of the cross blade assembly 9 at the test position, thereby achieving the function of testing the compaction of the sand layer. The torque measuring sensor 14 transmits the electrical signal to the data acquisition instrument 16 through the data transmission line 15. The data acquisition instrument 16 plots the torque change curve and obtains the torque peak value.

[0043] It should be noted that the electronic devices involved in this application, such as the torque measurement sensor 14, data transmission line 15 and data acquisition instrument 16, etc., all adopt existing technologies, such as standard parts or modified parts obtained through purchase. The working principle of the electronic devices and the communication protocols and communication interfaces between them are not protected here.

[0044] In the geotechnical laboratory, geological physical models of different densities were prepared using silty fine sand. The number of model samples was maximized to fully reflect the conditions of sand at different densities, ranging from loose to dense. The testing device of this application will be described in detail below based on actual usage:

[0045] The cross plate assembly 9 is driven downwards along with the drill rod assembly 1 into the prepared sand layer for 15cm. The rotating handle 2 is connected, and the torque measurement sensor 14 and the data acquisition instrument 16 are turned on. One tester simulates applying torque on site by rotating the rotating handle 2, while another tester observes the torque change curve of the data acquisition instrument 16. When a significant torque peak appears, the rotation is stopped. The density of the sand is then compared with the measured torque peak. The same method and operating steps are then used to test sand sample models with other densities.

[0046] Through extensive testing and in conjunction with existing engineering data, the density of fine sand is correlated one-to-one with the peak torque value obtained from the tests. The minimum peak torque value is proposed for sand in a dense state, and finally a sand density discrimination interval is formed. After field testing, the sand density can be quickly determined based on this interval.

[0047] Specifically, during field testing, a Luoyang shovel with a head diameter of not less than 60mm is first used to drill a hole to explore the stratum elevation where the test is to be conducted. The cross plate assembly 9 is then connected to the drill rod assembly 1 until the cross plate assembly 9 reaches the predetermined depth. At this point, the length of the drill rod assembly 1 left above the ground must be not less than 60cm. Otherwise, another standard drill rod segment 3 should be connected. Then, the triangular support frame 6 is inserted into the drill rod assembly 1 through the reserved limit. The support legs 8 are fixed on the ground 17 in a triangular distribution, ensuring that the support tray 7 is as horizontal as possible. Finally, the data transmission line 15 is connected to the torque measurement sensor 14 and the data acquisition instrument 16. At the start of the test, the vane assembly 9 was first statically pressed into the soil layer to a depth of 15cm. This was primarily to avoid the influence of residual soil at the bottom of the hole on the results. After preparation, the operation of the torque measurement sensor 14 was checked, and the data acquisition instrument 16 was turned on. One technician on site applied torque slowly and evenly to the rotating handle 2, causing significant shear failure in the lower fine sand. Another technician on site observed the data acquisition instrument 16 in real time. When a significant torque peak appeared, the torque application was stopped, and the peak torque was recorded. If the torque could not be twisted, the data acquisition instrument 16 showed that the peak torque had exceeded the laboratory's measured peak torque for compacted sand, and the test was stopped, directly determining it to be in a compacted state. For sand that was not in a compacted state, the vane assembly 9 was further driven into the sand layer to a depth of 10cm, and the above steps were repeated, recording the peak torque. Subsequently, the vane assembly 9 was driven into the sand layer to a depth of 10cm again, bringing the cumulative depth to 35cm. The above steps were repeated, and the peak torque was recorded. Finally, the average value of the obtained peak torque data was calculated and compared with the test results of different silty fine sand density intervals in the laboratory to obtain the sand density at different depths of the site, thereby making an accurate judgment.

[0048] In summary, this utility model mainly addresses the shortcomings of existing methods for testing the density of fine sand in aeolian sandy areas. Based on extensive summarization of the properties of sand extracted by Luoyang shovels during the preliminary survey process, and after reviewing relevant literature and materials, it proposes a convenient testing device using a vane assembly to test the density of fine sand. This method not only accurately tests the density of sand, but also makes the testing of sand density more convenient due to the simple structure and ease of disassembly and portability.

[0049] It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various modifications or changes based on them. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A convenient testing device for the compaction of fine sandy soil in aeolian sandy areas, which is inserted into an exploration hole (18) formed by a Luoyang shovel for testing, characterized in that, Includes drill pipe assembly (1) and vane assembly (9); The drill pipe assembly (1) includes a rotary handle (2), a standard drill pipe segment (3), and a drill pipe with a gradually changing cross section that are detachably connected in sequence. The standard drill pipe segment (3) has multiple segments and is spliced ​​together one by one along the length direction. The cross plate assembly (9) includes a shaft (10) and a cross plate stainless steel sheet (11). The shaft (10) is detachably connected to the cross section gradient drill rod (4). The cross plate stainless steel sheet (11) is fixed in a cross shape around the shaft (10) along the length direction, and a cross plate cutting foot (12) is provided at the bottom. The cross plate cutting foot (12) is used to cut sand in the vertical direction and drive the cross plate assembly (9) to be vertically pressed into the sand layer until the test position is reached.

2. The convenient testing device for the compaction of silty fine sand in aeolian sandy areas as described in claim 1, characterized in that, The drill pipe assembly (1) is made of solid steel. The rotary handle (2) is welded to the adjacent standard drill pipe segment (3). The two adjacent standard drill pipe segments (3) and the cross-section gradually changing drill pipe (4) are respectively connected by threaded heads (5).

3. The convenient testing device for the compaction of silty fine sand in aeolian sandy areas as described in claim 1, characterized in that, The cross plate assembly (9) is made of stainless steel. The shaft (10) is a cylindrical shape with a thicker top and a thinner bottom, and the diameter is not uniform. The diameter of the top of the shaft (10) matches the diameter of the bottom of the cross-section gradually changing drill rod (4). The length of the stainless steel cross plate (11) is the same as the length of the shaft (10). The cutting edge of the cross plate (12) is vertically downward.

4. The convenient testing device for the compaction of silty fine sand in aeolian sandy areas as described in claim 1, characterized in that, The depth of the exploration hole (18) is the predetermined hole depth reached after the Luoyang shovel makes the hole. After the cross blade foot (12) passes through the exploration hole (18), it continues to cut the sand and soil downward until it reaches the test position. The torque is applied by the horizontal rotation of the rotating handle (2).

5. The convenient testing device for the compaction of silty fine sand in aeolian sandy areas as described in claim 1, characterized in that, It also includes a triangular support frame (6), which is detachably fitted onto the outside of the drill rod assembly (1) and erected on the ground (17) outside the opening of the exploration hole (18) to limit and support the drill rod assembly (1).

6. The convenient testing device for the compaction of silty fine sand in aeolian sandy areas as described in claim 5, characterized in that, The triangular support frame (6) includes a support tray (7) and support legs (8). The center of the support tray (7) is provided with a limiting hole for the standard drill rod segment (3) to pass through. The support tray (7) is horizontally arranged. There are three support legs (8), which are evenly distributed on the bottom of the support tray (7). The support legs (8) are hinged to the support tray (7) via the top hinge shaft (801) and contact the ground (17) via the bottom anti-slip boot (802).

7. The convenient testing device for the compaction of silty fine sand in aeolian sandy areas as described in claim 1, characterized in that, It also includes a detection component (13), which includes a torque measurement sensor (14), a data transmission line (15), and a data acquisition device (16). The torque measurement sensor (14) is mounted on the rotary handle (2) and connected to the data acquisition device (16) via the data transmission line (15).

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