Geological survey drilling elastic sampling tube

Abstract

The utility model provides a kind of geological survey drilling elastic sampling tube, under the elastic force drive of elastic member, moving part drives elastic shielding part to stretch into inside of sampling tube body through communicating hole, elastic shielding part enters opening position, forms shielding to opening, prevents the soil mass in storage sample cavity from flowing out by opening large area. When sampling tube body is lifted, elastic member generates elastic force, and elastic shielding part is pressed into opening, so that opening changes from open state to shielded state, while elastic shielding part part stretches into storage sample cavity, and forms support and limit to lower soil sample. It can effectively prevent soft plastic or flow plastic fine-grained soil mass from flowing out or sliding down as a whole from opening in lifting stage, to avoid the condition that obvious empty section appears in storage sample cavity.

Description

Technical Field

[0001] This utility model relates to the field of geological exploration technology, and in particular to an elastic sampling tube for geological exploration drilling. Background Technology

[0002] In hydrogeological exploration and drilling projects, to obtain the hydrogeological parameters of the underground soil layers, it is usually necessary to conduct engineering geological and hydrogeological exploration of the soil layers during the drilling process. Specifically, a hole needs to be drilled at the proposed exploration location using a drilling rig, and soil samples need to be taken at different depths using a specialized drilling and sampling device to analyze the geotechnical engineering properties and hydrogeological characteristics of the soil layers. This yields basic data such as the burial depth, thickness distribution, interlayer interfaces, structural composition, and physical and mechanical properties of the soil layers, providing a basis for subsequent analysis of groundwater occurrence conditions.

[0003] In existing technologies, hydrogeological drilling commonly employs cylindrical drilling sampling tubes for in-situ sampling. After drilling to the target depth, the cylindrical sampling tube is pressed into the soil layer to be tested using drilling tools, filling the tube with soil at the corresponding depth. The sampling tube is then pulled out to the surface along with the drilling tools, and the soil sample inside is recorded and tested in layers to determine the structural composition and stratification interfaces of the soil layers at that depth.

[0004] However, when the target soil is a soft plastic or fluid plastic fine-grained soil layer (such as high-water-content silt, silty clay, saturated soft clay, etc.), the use of the aforementioned straight-tube sampling pipe has significant limitations. During the upward lifting of the straight-tube sampling pipe after sampling, due to the low structural strength and poor self-stabilizing ability of the soft soil layer, some soil cannot be reliably retained within the sampling pipe and remains on the borehole wall or within the sampling area. As the sampling pipe is lifted and disturbed by water and mud within the borehole, and due to its own weight, these remaining soft soil masses easily slide down, fall back, or redistribute along the borehole wall or sampling cavity. This results in local gaps or discontinuous stratification in the soil sample within the sampling pipe along the axial direction, failing to fully represent the undisturbed soil layer at the corresponding depth. The layer boundaries of the soil sample become confused or misaligned; soft soil moves downwards under gravity, causing soil from the upper layer to enter the lower layer, interfering with soil layer division and interface determination. This results in distortion of the soil structure information at the survey location, causing deviations in the hydrogeological and engineering geological analysis results based on the sample, and reducing the accuracy and reliability of the survey results. Utility Model Content

[0005] Therefore, it is necessary to propose a flexible sampling tube for geological exploration drilling to solve the above-mentioned technical problems.

[0006] A flexible sampling tube for geological exploration drilling, the flexible sampling tube for geological exploration drilling comprising: The sampling tube body has an opening, a sample storage cavity, and a connecting hole, wherein the sample storage cavity is connected to the opening, and the opening is connected to the connecting hole; An elastic movable member has a movable part and an elastic blocking part fixedly connected to one end of the movable part. The movable part is sleeved on the body of the sampling tube, and the elastic blocking part is received in the communicating hole. The elastic element has one end abutting against the sampling tube body and the other end abutting against the moving part; When the sampling tube body is pulled upward, the elastic element generates elastic force to press the elastic blocking part into the opening, so that the elastic blocking part blocks the opening. In at least one embodiment of this application, the elastic shielding portion includes: The connecting part has one end located on the moving part; An elastic part is provided at one end of the connecting part away from the moving part; The part extends into the blocking portion, with one end located at the end of the elastic portion away from the connecting portion, and is inclined relative to the length direction of the elastic portion. The end of the part extending into the blocking portion away from the elastic portion faces the geometric center of the opening.

[0007] In at least one embodiment of this application, the moving part has a movable cavity, the sampling tube body passes through the movable cavity, and is slidably connected to the moving part.

[0008] In at least one embodiment of this application, the sampling tube body includes: The sample storage section has a sample storage cavity inside, and a sliding groove is provided on the outside of the sample storage section. The elastic movable part is partially received in the sliding groove, and the elastic part is located in the sliding groove. The sampling section has the opening and extends from one end of the sample storage section.

[0009] In at least one embodiment of this application, the elastic movable member is provided with a slider, the slider extends into the groove, one end of the elastic member abuts against the groove, and the other end abuts against the slider.

[0010] In at least one embodiment of this application, the sampling tube body further includes: A protective sleeve is fitted over the sampling section and surrounds the sampling section, forming a protective cavity between the sampling section and the protective sleeve. The elastic movable member extends into the protective cavity, and the protective cavity communicates with the communicating hole.

[0011] In at least one embodiment of this application, one end of the protective sleeve is located at the end of the sampling section away from the sample storage section, and the connecting hole is opened at the junction of the protective sleeve and the sampling section.

[0012] In at least one embodiment of this application, there are multiple insertion blocking parts, and the multiple insertion blocking parts are arranged at equal angles with the axis of the sample storage cavity as the axis.

[0013] In at least one embodiment of this application, the maximum diameter of the elastic movable member is denoted as a, and the maximum diameter of the sampling tube body is denoted as b, satisfying the relationship: a > b.

[0014] In at least one embodiment of this application, the end of the sampling section away from the sample storage section has drill teeth.

[0015] Implementing the flexible sampling tube for geological exploration drilling in this embodiment will have at least the following beneficial effects: The aforementioned elastic sampling tube for geological exploration drilling, after sampling is completed, is pulled upwards from the soft soil layer along with the drilling tool. As the sampling tube moves upwards, the soil in front of and around the opening no longer obstructs the moving part, and the counter-thrust force on the moving part disappears. At this time, the elastic element in the pre-compressed state releases its elastic potential energy, applies a reverse elastic force to the moving part, and pushes the moving part to move in the opposite direction relative to the sampling tube body.

[0016] Driven by the elastic force of the elastic element, the moving part drives the elastic shielding part to extend into the inner side of the sampling tube body through the connecting hole. The elastic shielding part enters the opening position and forms a shield on the opening, preventing the soil in the sample storage cavity from flowing out of the opening over a large area.

[0017] The extended section of the elastic shielding part occupies only a portion of the cross-section of the sample storage cavity, providing partial shielding and support to the sample storage cavity. This inhibits the overall sliding and cross-layer fall of the soft soil layer during the lifting process, while retaining a certain amount of water body connectivity space to reduce negative pressure and strong disturbance caused by complete closure.

[0018] By setting a connecting hole on the sampling tube body and arranging an elastic movable component with an elastic shielding part on the outside of the sampling tube body, when the sampling tube body is lifted, the elastic component generates elastic force, pressing the elastic shielding part into the opening, changing the opening from an open state to a shielded state. At the same time, the elastic shielding part partially extends into the sample storage cavity, providing support and restraint for the soil sample below. This effectively prevents soft plastic or fluid plastic fine-grained soil from flowing out of the opening in large quantities or sliding down as a whole during the lifting stage, avoiding obvious empty sections in the sample storage cavity.

[0019] It can better maintain the original stratification and interface position of the soil sample column in the axial direction, so that the obtained soil sample is closer to the original soil layer in terms of layer thickness, layer boundary burial depth and structural combination, which significantly improves the accuracy of soil layer division and interface determination. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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.

[0021] in: Figure 1 A perspective view of a geological exploration drilling elastic sampling tube in one embodiment; Figure 2 An exploded view of a geological exploration drilling elastic sampling tube in one embodiment; Figure 3 This is a cross-sectional view of a geological exploration drilling elastic sampling tube in one embodiment. Figure 4 This is a diagram showing the usage status of an elastic sampling tube for geological exploration drilling in one embodiment.

[0022] Explanation of main component symbols 100. Geological exploration drilling elastic sampling tube; 110. Sampling tube body; 111. Opening; 112. Sample storage chamber; 113. Connecting hole; 120. Elastic moving part; 121. Moving part; 122. Elastic shielding part; 123. Connecting part; 124. Elastic part; 125. Extending shielding part; 130. Elastic element; 140. Moving chamber; 150. Sample storage section; 151. Slide groove; 152. Sampling section; 160. Sliding block; 170. Protective sleeve; 171. Protective chamber; 180. Drill teeth. Detailed Implementation

[0023] 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.

[0024] This invention provides a geological exploration drilling elastic sampling tube 100, the geological exploration drilling elastic sampling tube 100 comprising: The sampling tube body 110 has an opening 111, a sample storage chamber 112 and a connecting hole 113, wherein the sample storage chamber 112 is connected to the opening 111 and the opening 111 is connected to the connecting hole 113; The elastic movable member 120 has a movable part 121 and an elastic blocking part 122 fixedly connected to one end of the movable part 121. The movable part 121 is sleeved on the outside of the sampling tube body 110, and the elastic blocking part 122 is received in the communicating hole 113. The elastic element 130 has one end abutting against the sampling tube body 110 and the other end abutting against the moving part 121; When the sampling tube body 110 is pulled upward, the elastic member 130 generates elastic force to press the elastic blocking part 122 into the opening 111, so that the elastic blocking part 122 blocks the opening 111.

[0025] Please refer to Figures 1-4 In this embodiment, after sampling is completed, the sampling tube body 110 is pulled upward from the soft soil layer along with the drill bit. As the sampling tube body 110 moves upward, the soil in front of and around the opening 111 does not obstruct the moving part 121, and the counter-thrust force on the moving part 121 disappears. At this time, the elastic element 130 in the pre-compressed state releases elastic potential energy and applies a reverse elastic force to the moving part 121, pushing the moving part 121 to move in the opposite direction relative to the sampling tube body 110.

[0026] Driven by the elastic force of the elastic element 130, the moving part 121 drives the elastic shielding part 122 to extend into the inner side of the sampling tube body 110 through the connecting hole 113. The elastic shielding part 122 enters the opening 111 position and forms a shield on the opening 111, preventing the soil in the sample storage cavity 112 from flowing out of the opening 111 over a large area.

[0027] The extended section of the elastic shielding part 122 occupies only a part of the cross-section of the sample storage cavity 112, forming partial shielding and support for the sample storage cavity 112, inhibiting the overall sliding and cross-layer fall of the soft soil layer during the lifting process, while retaining a certain water body connection space to reduce the negative pressure and strong disturbance caused by complete closure.

[0028] By providing a connecting hole 113 on the sampling tube body 110 and arranging an elastic movable member 120 with an elastic blocking part 122 on the outside of the sampling tube body 110, when the sampling tube body 110 is lifted, the elastic member 130 generates elastic force, pressing the elastic blocking part 122 into the opening 111, changing the opening 111 from an open state to a blocked state. At the same time, the elastic blocking part 122 partially extends into the sample storage cavity 112, providing support and limiting for the lower soil sample. This effectively prevents soft plastic or fluid plastic fine-grained soil from flowing out of the opening 111 in large quantities or sliding down as a whole during the lifting stage, avoiding obvious empty sections in the sample storage cavity 112.

[0029] It can better maintain the original stratification and interface position of the soil sample column in the axial direction, so that the obtained soil sample is closer to the original soil layer in terms of layer thickness, layer boundary burial depth and structural combination, which significantly improves the accuracy of soil layer division and interface determination.

[0030] Compared with a completely closed sealing structure, it reduces the slippage of soft soil and does not cause a large negative pressure or strong water pressure gradient in the sample storage chamber 112 due to the complete sealing of the lower end. This reduces the secondary disturbance to the original structure and water content of the soft soil and is conducive to preserving the original state of the soil sample.

[0031] Because soil loss, layer mixing, and layer boundary misalignment are significantly suppressed during the extraction process, the soil sample column obtained from the sampling tube more closely resembles the in-situ soil layer in terms of layer structure, thickness distribution, and physical state. Based on this soil sample, laboratory tests were conducted to assess its water content, permeability, compressibility, and shear strength. The test results more accurately reflect the hydrogeological and geotechnical properties of the target soil layer, thereby improving the accuracy of groundwater occurrence condition analysis, foundation bearing capacity assessment, and deformation prediction.

[0032] It should be noted that the sampling tube body 110 is a hollow cylindrical structure with a sample storage cavity 112 formed along the axial direction. An opening 111 is provided at the lower end of the sampling tube body 110, which is connected to the sample storage cavity 112. Soft plastic or fluid plastic soil can enter the sample storage cavity 112 through the opening 111 during drilling and pressing to form a soil sample column.

[0033] Near the lower end of the sampling tube body 110, a connecting hole 113 is provided on its side wall. The connecting hole 113 communicates with the space where the lower opening 111 is located, so that the structure on the outside of the sampling tube body 110 (i.e., the elastic shielding part 122) can partially extend into the vicinity of the opening 111 and the lower region of the sample storage cavity 112 through the connecting hole 113.

[0034] The moving part 121 is a ring-shaped or sleeve-shaped structure, which is sleeved on the outside of the sampling tube body 110 along the axial direction of the sampling tube body 110, and can move axially or slide to a limited extent relative to the sampling tube body 110.

[0035] The elastic shielding part 122 is fixedly connected to one end of the moving part 121. A portion of it is housed in the connecting hole 113 of the sampling tube body 110. When the sampling tube body 110 is pulled upward, the elastic shielding part 122 moves inward under the action of the elastic member 130, so that it extends through the connecting hole 113 into the lower region of the opening 111 and the sample storage cavity 112, thereby shielding a portion of the cross section of the sample storage cavity 112.

[0036] An elastic element 130 is disposed between the sampling tube body 110 and the moving part 121, and may be, for example, a helical spring, a disc spring, or other elastic component. One end of the elastic element 130 abuts against the sampling tube body 110, and the other end abuts against the moving part 121.

[0037] Under different working conditions of axial movement of the sampling tube body 110, the moving part 121 is displaced relative to the sampling tube body 110, causing the elastic element 130 to be compressed or stretched. Especially when the sampling tube body 110 is pulled upward, the elastic element 130 generates elastic force, driving the moving part 121 to move in a predetermined direction, thereby causing the elastic blocking part 122 to move inward through the connecting hole 113 into the sampling tube body 110, partially extending into the sample storage cavity 112, forming partial blocking of the lower end area of ​​the sample storage cavity 112.

[0038] It should be further explained that during the drilling and sampling process, the sampling tube body 110 is drilled downwards with the drilling tool and pressed into the soft plastic or fluid plastic fine-grained soil layer. As the sampling tube body 110 moves downwards, the soil enters the sample storage cavity 112 through the opening 111 and gradually fills to form a soil sample column distributed along the axial direction.

[0039] As the sampling tube continues to descend, the soil in front of and around the opening 111 gradually comes into contact with the moving part 121. This is because the moving part 121 is fitted onto the outside of the sampling tube body 110 and is located near the opening 111.

[0040] As the sampling tube body 110 is pressed further down into the soil layer, the soil blocking moving part 121 in front of and around the opening 111 continues to descend with the sampling tube body 110, thereby generating a counter-thrust force relative to the sampling tube body 110 on the moving part 121. Under the action of this counter-thrust force, the moving part 121 is forced to move backward relative to the sampling tube body 110. The axial displacement of the moving part 121, through its fixed connection with the elastic shielding part 122, causes the elastic shielding part 122 to generate an axial displacement relative to the sampling tube body 110.

[0041] Meanwhile, since one end of the elastic element 130 is fixed to the sampling tube body 110 and the other end abuts against the moving part 121, when the moving part 121 moves backward relative to the sampling tube body 110 under the action of soil counter-thrust, the elastic element 130 is compressed, enters the pre-compression state and stores elastic potential energy.

[0042] During the drilling and sampling process, the soil first applies a counter-thrust force to the moving part 121. Under the action of this counter-thrust force, the moving part 121 moves backward relative to the sampling tube body 110, thereby compressing the elastic member 130 arranged between it and the sampling tube body 110, and causing the elastic shielding part 122 fixedly connected to it to generate axial displacement relative to the sampling tube body 110.

[0043] In at least one embodiment of this application, the elastic shielding portion 122 includes: The connecting part 123 is located at one end of the moving part 121; The elastic part 124 is located at one end of the connecting part 123 away from the moving part 121; The shielding part 125 extends into the elastic part 124, with one end located at the end of the elastic part 124 away from the connecting part 123, and is inclined relative to the length direction of the elastic part 124. The end of the shielding part 125 extending into the elastic part 124 away from the elastic part 124 is directed toward the geometric center of the opening 111.

[0044] Please refer to Figures 1-4 In this embodiment, when the sampling is completed and the tube is lifted, the sampling tube body 110 moves upward relative to the soil, the counter-pushing force of the soil in front of the opening 111 on the moving part 121 disappears, the pre-compressed elastic element 130 releases its elastic force, and pushes the moving part 121 back.

[0045] Driven by the elastic force of the elastic member 130, the moving part 121 moves the elastic part 124 as a whole toward the lower end of the sampling tube body 110 via the connecting part 123.

[0046] Since the extended blocking part 125 is arranged at an angle relative to the elastic part 124, and its free end points to the geometric center of the opening 111, when the elastic part 124 is pushed, it generates an elastic force that acts on the blocking part, and is inserted into the area of ​​the opening 111 through the connecting hole 113, with its front end naturally aligned with the center position of the opening 111.

[0047] The portion extending into the shielding part 125 enters the lower region of the sample storage chamber 112, shielding and supporting a portion of the cross-section of the sample storage chamber 112.

[0048] When the inserting shield 125 is inserted, its free end will enter the central area of ​​the opening 111 and the sample storage chamber 112, forming a lifting and shearing barrier on the central soil. Even if the inserting shield 125 only shields a part of the section, it at least blocks the middle channel, which is most prone to collapse, greatly reducing the overall downward trend.

[0049] The extended shield 125 forms a fulcrum at the center of the cross section, and the lower soil sample can form a stress state similar to a soil arch on it. The self-weight and downward trend of the upper soil are dispersed and transferred to the surrounding soil and pipe wall when it reaches the central fulcrum, making the whole more stable.

[0050] It should be noted that one end of the connecting part 123 is fixedly disposed on the moving part 121, and may be, for example, an integrally formed bent piece, an ear plate, or an arm extending from the edge of the moving part 121. The function of the connecting part 123 is to reliably connect the outer moving part 121 with the inner elastic part 124, so that force and displacement are transmitted from the moving part 121 to the elastic part 124, and then to the extending blocking part 125.

[0051] One end of the elastic part 124 is disposed at the end of the connecting part 123 away from the moving part 121. The elastic part 124 is an elastic arm, elastic sheet or elastic rod extending from the connecting part 123. It is used to generate elastic force when the blocking part 125 is inserted into the opening 111 so as to insert the blocking part 125 into the opening 111.

[0052] One end of the extending portion 125 is located at the end of the elastic portion 124 away from the connecting portion 123, that is, at the foremost part of the entire elastic shielding structure. The extending portion 125 is inclined relative to the length direction of the elastic portion 124, and its end away from the elastic portion 124 is directed toward the geometric center of the opening 111.

[0053] When the sampling tube is lifted and the elastic element 130 releases its elastic force, the moving part 121 is pushed back by the elastic element 130, which drives the connecting part 123, the elastic part 124 and the extension shielding part 125 to move as a whole toward the opening 111. The extension shielding part 125 extends into the inside of the sampling tube through the connecting hole 113, enters the area corresponding to the opening 111, and partially extends into the lower part of the sample storage cavity 112, forming a local shielding and support within the cross section of the sample storage cavity 112.

[0054] It should be further explained that during the sampling stage, as the sampling tube continues to move downward, the soil in front of and around the opening 111 comes into contact with the moving part 121, generating a counter-pushing force on the moving part 121. The moving part 121 is forced to move backward relative to the sampling tube body 110, and together with the connecting part 123, the elastic part 124 and the extended shielding part 125, it undergoes axial displacement, while compressing the elastic element 130 between the sampling tube body 110 and the moving part 121.

[0055] At this stage, the extended shielding part 125 has not yet been significantly pressed into the central area of ​​the opening 111, and the sample storage cavity 112 is not shielded, so as not to affect the smooth entry of the soil.

[0056] In at least one embodiment of this application, the moving part 121 has a movable cavity 140, the sampling tube body 110 passes through the movable cavity 140 and is slidably connected to the moving part 121.

[0057] Please refer to Figures 1-4 In this embodiment, when sampling is completed and the tube is lifted, the sampling tube body 110 is pulled upwards, and the reverse thrust of the soil on the moving part 121 disappears.

[0058] The pre-compressed elastic element 130 releases its elastic force, pushing the moving part 121 to slide in the opposite direction along the axial direction of the sampling tube body 110. Under the guidance and constraint of the movable cavity 140, the moving part 121 still moves smoothly along the axial direction of the sampling tube, pushing the connecting part 123, the elastic part 124 and the extending shielding part 125 as a whole into the opening 111 area.

[0059] With the guidance of the connecting hole 113 and the cooperation of the elastic part 124, the extending shielding part 125 extends obliquely into the opening 111 and partially into the sample storage cavity 112, thereby achieving shielding of the opening 111 and partial shielding of the sample storage cavity 112.

[0060] The movable cavity 140 provides an inner guide sleeve for the moving part 121, through which the sampling tube body 110 passes, and the inner wall and the outer wall of the sampling tube body 110 form a sliding guide pair.

[0061] When the soil exerts a counter-thrust force on the moving part 121 during drilling, the moving part 121 is constrained by the active cavity 140 and can only move along the axis of the sampling tube body 110. It will not deviate radially to one side, thus preventing tilting and jamming caused by eccentric force.

[0062] During the lifting phase, when the elastic element 130 releases its elastic force, the moving part 121 also slides smoothly along the axial direction within the movable cavity 140, ensuring that the elastic blocking part 122 can accurately reach the vicinity of the opening 111, thereby achieving the expected blocking effect.

[0063] It should be noted that the moving part 121 is preferably an annular or sleeve-shaped structure, and a hollow movable cavity 140 is provided inside it along the axial direction. The cross-section of the movable cavity 140 can be circular, nearly circular, or other shapes that match the shape of the sampling tube body 110. The axis of the movable cavity 140 is basically coincident with the axis of the sampling tube body 110. The inner wall of the movable cavity 140 serves as a guide surface and is arranged opposite to the outer wall of the sampling tube body 110 to provide guidance and limit the axial movement of the moving part 121.

[0064] In at least one embodiment of this application, the sampling tube body 110 includes: The sample storage section 150 has the sample storage cavity 112 formed inside, and the sample storage section 150 has a sliding groove 151 on the outside. The elastic movable member 120 is partially received in the sliding groove 151, and the elastic member 130 is located in the sliding groove 151. The sampling section 152 has the opening 111 and extends from one end of the sample storage section 150.

[0065] Please refer to Figures 1-4In this embodiment, after sampling is completed, the sampling tube body 110 is lifted, and the counter-pushing force of the soil in front of the opening 111 on the moving part 121 disappears. The pre-compressed elastic member 130 releases its elastic force in the slide groove 151, pushing the elastic movable member 120 to slide in the opposite direction in the slide groove 151, and the moving part 121 drives the elastic blocking part 122 to move towards the opening 111.

[0066] The elastic shielding part 122 extends into the sampling section 152 through the connecting hole 113 to shield the opening 111 and partially extends into the lower part of the sample storage cavity 112, providing support and limiting the lower soil sample and preventing the soft soil sample from sliding down and falling back during the lifting process.

[0067] It should be noted that the sample storage section 150 is a hollow cylindrical structure with a sample storage cavity 112 running through its interior along the axial direction. This cavity is used to receive soil samples entering through the opening 111, forming a soil sample column distributed along the axial direction.

[0068] A groove 151 extending axially is provided on the outer surface of the sample storage section 150. The groove 151 can be a strip groove recessed in the outer circumference, and the cross-section can be rectangular, trapezoidal or other shapes that facilitate guidance.

[0069] A portion of the elastic movable member 120 is housed in the slide groove 151, which serves to guide, limit, and protect the elastic movable member 120.

[0070] The sampling section 152 is located at one end of the sample storage section 150, preferably integrally extended from the lower end of the sample storage section 150, and the two are coaxially connected. The interior of the sampling section 152 is connected to the sample storage cavity 112. An opening 111 is provided at the lower end of the sampling section 152 for allowing soil to enter the sample storage cavity 112 during drilling and sampling.

[0071] In at least one embodiment of this application, the elastic movable member 120 is provided with a slider 160, the slider 160 extends into the groove 151, one end of the elastic member 130 abuts against the groove 151, and the other end abuts against the slider 160.

[0072] Please refer to Figures 1-4 In this embodiment, when the sampling is completed, the tube body 110 moves upward relative to the soil as a whole, and the counter-thrust force of the soil in front of and around the opening 111 on the moving part 121 disappears.

[0073] At this time, the elastic element 130, which is in a pre-compressed state, applies a reverse elastic force to the slider 160, pushing the slider 160 to move forward along the axial direction of the slide groove 151.

[0074] When the slider 160 moves forward, it drives the elastic movable part 120 (and its connecting part 123, elastic part 124 and extending blocking part 125) which is rigidly connected to it to move relative to the sampling tube body 110 toward the opening 111.

[0075] Guided by the connecting hole 113 and the elastic part 124, the extending shielding part 125 eventually extends into the opening 111 area to shield the opening 111, and partially extends into the lower part of the sample storage cavity 112 to support and limit the soil sample below.

[0076] The two ends of the elastic element 130 abut against the end wall of the groove 151 and the slider 160 respectively, forming a clear end-face force relationship. The soil transmits the axial counterforce to the elastic element 130 through the moving part 121 and the slider 160. The elastic element 130 is compressed in an approximately linear manner, and the magnitude of the elastic force is stably related to the displacement of the slider 160.

[0077] The slider 160 is axially guided in the groove 151, so that the relative movement of the elastic movable member 120 is restricted in a preset direction. The elastic member 130 is also compressed and elongated axially in the groove 151, thereby ensuring that the insertion blocking part 125 accurately extends into the opening 111 and the lower part of the sample storage cavity 112 when it is lifted.

[0078] The elastic movable member 120 is preferably a ring-shaped or sleeve-shaped moving part 121, with a slider 160 integrally or fixedly provided on its outer periphery or side. The slider 160 protrudes radially or obliquely from the elastic movable member 120 and extends into the groove 151 outside the sample storage section 150, so that at least a part of the slider 160 is located in the cavity of the groove 151. The slider 160 can be a block-shaped, strip-shaped or tongue-shaped structure, and its cross-section can be designed into a rectangle, trapezoid or other matching shape according to the cross-sectional shape of the groove 151, so as to achieve reliable guidance in the groove 151.

[0079] The groove 151 is a groove arranged along the axial direction of the sample storage section 150. After the slider 160 is embedded in the groove 151, it forms a matching guide surface with the side wall and bottom of the groove 151. The slider 160 and the groove 151 are in sliding fit, allowing the slider 160 to move back and forth in the axial direction of the groove 151, while being restricted in the radial and circumferential directions, thereby limiting the movement of the elastic movable member 120 to the axial sliding direction.

[0080] The elastic element 130 (such as a helical compression spring) is integrally arranged in the slide groove 151. One end of the elastic element 130 abuts against one end face of the slide groove 151 or is set on a fixed limiting surface (such as the bottom end wall, step or limiting block of the slide groove 151) in the slide groove 151. The other end of the elastic element 130 abuts against the slider 160. That is, the elastic element 130 is arranged between the end wall of the slide groove 151 and the slider 160 in the slide groove 151. When the slider 160 moves axially in the slide groove 151, it will compress or release the elastic element 130.

[0081] In at least one embodiment of this application, the sampling tube body 110 further includes: A protective sleeve 170 is fitted over the sampling section 152 and surrounds the sampling section 152. A protective cavity 171 is formed between the sampling section 152 and the protective sleeve 170. The elastic movable member 120 extends into the protective cavity 171, and the protective cavity 171 communicates with the communicating hole 113.

[0082] Please refer to Figures 1-4 In this embodiment, the pre-compressed elastic element 130 releases its elastic force, pushing the moving part 121 forward along the axial direction. The elastic shielding part 122 is obliquely pressed into the opening 111 from the protective cavity 171 side through the connecting hole 113 and only partially extends into the sample storage cavity 112, thereby shielding the opening 111 and partially shielding the sample storage cavity 112, supporting the soft soil sample at the bottom, and suppressing the sliding and falling back during the lifting process.

[0083] Because the protective cavity 171 runs through the top and bottom, the water pressure inside and outside the protective cavity 171 is easily balanced, the moving parts have low resistance to movement and return to their original position quickly, thus achieving shielding.

[0084] Single-ended openings 111 or blind cavities are prone to accumulating mud and fine particles, which over time can encase the elastic moving parts 120, causing sluggish or even malfunctioning movements. After penetrating both vertically, drilling and lifting will create a predictable axial flow path within the protective cavity 171, carrying fine particles through them and preventing them from remaining in the cavity, significantly reducing the probability of jamming.

[0085] The protective cavity 171 is a ring-shaped or near-ring-shaped cavity formed between the inner wall of the protective sleeve 170 and the outer wall of the sampling section 152, and the cavity runs vertically through the sampling section 152 (i.e., both the upper and lower ends are open), forming a continuous circumferential flow channel.

[0086] The sampling tube body 110 has a connecting hole 113 on its side wall. The outer port of the connecting hole 113 opens directly into the protective cavity 171, and the inner port communicates with the inside of the sampling section 152 (the lower area of ​​the opening 111 / sampling cavity 112), ensuring that the protective cavity 171 and the connecting hole 113 are interconnected.

[0087] In at least one embodiment of this application, one end of the protective sleeve 170 is located at the end of the sampling section 152 away from the sample storage section 150, and the connecting hole 113 is opened at the junction of the protective sleeve 170 and the sampling section 152.

[0088] Please refer to Figures 1-4 In this embodiment, after sampling is completed, the pre-compressed elastic element 130 is lifted up, and the elastic force is released. The elastic movable element 120 is driven to move axially downward (towards the end of the sampling section 152) through the slider 160 and the movable cavity 140.

[0089] Driven by the elastic movable member 120, the elastic shielding part 122 extends from the upper region of the protective cavity 171 through the connecting hole 113 into the interior of the sampling tube body 110. Since the connecting hole 113 is located at the junction of the protective sleeve 170 and the sampling section 152, its inner opening corresponds to the lower region of the sample storage cavity 112.

[0090] The elastic shielding part 122 is pressed into and shields the area corresponding to the sampling opening 111, preventing the soil sample from flowing out directly and in large quantities from the opening 111.

[0091] The extended section of the elastic shielding part 122 is located near the lower end of the sample storage cavity 112, which partially shields and supports the sample storage cavity 112, effectively supporting the soft soil sample below and inhibiting the sliding and falling back during the lifting process.

[0092] The connecting hole 113 is arranged at the junction of the protective sleeve 170 and the sampling section 152, and its inner opening is naturally located in the area near the opening 111 at the lower end of the sample storage cavity 112, so that the elastic shielding part 122 can support the soil as soon as it enters the tube.

[0093] The connecting hole 113 is located at the junction of the upper end of the protective sleeve 170 and the sampling section 152. The inner opening corresponds to the key area at the lower end of the sample storage cavity 112, so that after the elastic shielding part 122 extends in, it can directly support and shear limit the bottom soil sample that is prone to sliding, effectively preventing the soft plastic or fluid plastic soil layer from collapsing and falling back from the bottom when it is lifted.

[0094] In at least one embodiment of this application, there are multiple insertion blocking parts 125, and the multiple insertion blocking parts 125 are arranged at equal angles with the axis of the sample storage cavity 112 as the axis.

[0095] Please refer to Figures 1-4 In this embodiment, when the multiple extending shielding parts 125 are lifted after sampling, they can simultaneously extend into the opening 111 to support the soil sample in the storage cavity 112, thus preventing the soil sample from partially detaching and the soil layer from shifting due to the gravity of the soil sample during the lifting process.

[0096] This improves the accuracy of subsequent test results and ensures the integrity of the soil sample.

[0097] In at least one embodiment of this application, the maximum diameter of the elastic movable member 120 is denoted as a, and the maximum diameter of the sampling tube body 110 is denoted as b, satisfying the relationship: a > b.

[0098] Please refer to Figures 1-4 In this embodiment, since the maximum diameter of the elastic movable member 120 is denoted as a and the maximum diameter of the sampling tube body 110 is denoted as b, the relationship is satisfied: a > b.

[0099] Specifically, the diameter of the moving part 121 is larger than the maximum diameter of the sampling tube body 110. During the drilling and sampling process, as the drilling progresses, the moving part 121 will be squeezed by the soil layer and will be displaced upward relative to the sampling tube body 110. This will cause the elastic shielding part 122 to be housed in the protective cavity 171 in the initial stage, and at the same time, generate a compressive force on the elastic element 130. As the drilling continues, the moving part 121 will maintain continuous pressure, so that the elastic shielding part 122 will not block the position of the opening 111.

[0100] During the lifting process, since there is no soil layer exerting upward pressure on the moving part 121, as the moving part 121 is lifted, under the spring force of the elastic element 130 and the compression of the soil layer, the elastic blocking part 122 will extend into the opening 111, thereby partially blocking the opening 111 to form a supporting force on the soil sample in the sample storage chamber 112, and continuously supporting the soil sample as it is lifted.

[0101] In at least one embodiment of this application, the sampling section 152 has drill teeth 180 at the end away from the sample storage section 150.

[0102] Please refer to Figures 1-4 In this embodiment, the drill teeth 180 are tooth-shaped and used for drilling. There are multiple drill teeth 180, and a connecting hole 113 is provided between two adjacent drill teeth.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A flexible sampling tube for geological exploration drilling, characterized in that, The geological exploration drilling elastic sampling tube includes: The sampling tube body has an opening, a sample storage cavity, and a connecting hole, wherein the sample storage cavity is connected to the opening, and the opening is connected to the connecting hole; An elastic movable member has a movable part and an elastic blocking part fixedly connected to one end of the movable part. The movable part is sleeved on the body of the sampling tube, and the elastic blocking part is received in the communicating hole. The elastic element has one end abutting against the sampling tube body and the other end abutting against the moving part; When the sampling tube body is pulled upward, the elastic element generates elastic force to press the elastic blocking part into the opening, so that the elastic blocking part blocks the opening.

2. The elastic sampling tube for geological exploration drilling according to claim 1, characterized in that, The elastic shielding portion includes: The connecting part has one end located on the moving part; An elastic part is provided at one end of the connecting part away from the moving part; The part extends into the blocking portion, with one end located at the end of the elastic portion away from the connecting portion, and is inclined relative to the length direction of the elastic portion. The end of the part extending into the blocking portion away from the elastic portion faces the geometric center of the opening.

3. The elastic sampling tube for geological exploration drilling according to claim 1, characterized in that, The moving part has a movable cavity, and the sampling tube body passes through the movable cavity and is slidably connected to the moving part.

4. The elastic sampling tube for geological exploration drilling according to claim 3, characterized in that, The sampling tube body includes: The sample storage section has a sample storage cavity inside, and a sliding groove is provided on the outside of the sample storage section. The elastic movable member is partially received in the sliding groove, and the elastic member is located in the sliding groove. The sampling section has the opening and extends from one end of the sample storage section.

5. The elastic sampling tube for geological exploration drilling according to claim 4, characterized in that, The elastic movable member is provided with a slider, the slider extends into the groove, one end of the elastic member abuts against the groove, and the other end abuts against the slider.

6. The elastic sampling tube for geological exploration drilling according to claim 4, characterized in that, The sampling tube body also includes: A protective sleeve is fitted over the sampling section and surrounds the sampling section, forming a protective cavity between the sampling section and the protective sleeve. The elastic movable member extends into the protective cavity, and the protective cavity communicates with the communicating hole.

7. The elastic sampling tube for geological exploration drilling according to claim 6, characterized in that, One end of the protective sleeve is located at the end of the sampling section away from the sample storage section, and the connecting hole is opened at the junction of the protective sleeve and the sampling section.

8. The elastic sampling tube for geological exploration drilling according to claim 2, characterized in that, There are multiple extending shielding parts, and the multiple extending shielding parts are arranged at equal angles with the axis of the sample storage cavity as the axis.

9. The elastic sampling tube for geological exploration drilling according to claim 2, characterized in that, Let a be the maximum diameter of the elastic movable component and b be the maximum diameter of the sampling tube body. The relationship is: a > b.

10. The elastic sampling tube for geological exploration drilling according to claim 4, characterized in that, The sampling section has drill teeth at its end away from the sample storage section.

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