Engineering investigation core tube

Abstract

The application relates to the technical field of engineering investigation, in particular to an engineering investigation core tube. The engineering investigation core tube comprises a core tube body and a protection gasket, wherein the core tube body is provided with a core containing area, the core containing area comprises a first containing area and a second containing area, a clamping table is arranged between the first containing area and the second containing area, and the core tube body comprises a core tube inner wall; the protection gasket is movably arranged in the core tube body through a sliding device and is connected with the clamping table, and an installation gap is formed between the protection gasket and the core tube inner wall. The embodiment of the application provides the engineering investigation core tube to solve the problem that the existing core tube in the related art is easily washed away by washing liquid, thereby reducing the core taking rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering investigation, in particular to an engineering investigation core tube. BACKGROUND

[0002] Coring refers to the process of sampling rock of stratum drilled by a drilling machine for understanding geological conditions. At present, in engineering investigation mainly covering stratum, a single tube drilling coring method is mainly used.

[0003] In the related art, in the process of coring by using a single tube drilling, rock needs to be cut and broken, and drilling flushing liquid is often used to flush the soil layer, the flushing liquid is easy to flow into the drilled core, resulting in a low core recovery rate, so that the soil layer cannot be accurately identified, and the accuracy of engineering investigation is affected. In addition, drilling circulating fluid needs to be pumped into the core tube to cool the drill bit during drilling, and the pumped drilling circulating fluid directly flushes the taken core in the core tube, which also affects the core recovery rate. SUMMARY

[0004] The embodiment of the present application provides an engineering investigation core tube to solve the problem of low core recovery rate caused by the fact that the existing core tube is easily scattered by flushing liquid in the related art.

[0005] To achieve the above purpose, the embodiment of the present application provides an engineering investigation core tube, which comprises:

[0006] A core tube body, the core tube body is provided with a core containing area, the core containing area comprises a first containing area and a second containing area, a clamping table is arranged between the first containing area and the second containing area, and the core tube body comprises a core tube inner wall.

[0007] A protective pad is movably arranged in the core tube body by a sliding device and connected to the clamping table, and the protective pad has a mounting gap with the core tube inner wall.

[0008] In some embodiments, a sliding groove is arranged on the core tube inner wall along the axial direction of the core tube body, and the sliding device is slidably arranged on the core tube inner wall through the sliding groove.

[0009] In some embodiments, the sliding groove is arranged in the first containing area.

[0010] In some embodiments, a sliding groove is arranged on the core tube inner wall along the axial direction of the core tube body.

[0011] The sliding device comprises a mounting groove, a short rod and a ball, the mounting groove is arranged in the circumferential direction of the protective pad, the ball is fixed in the mounting groove through the short rod and slidably arranged in the sliding groove.

[0012] The protective pad is circular, and the distance from the end of the ball away from the center of the protective pad to the center is greater than the radius of the protective pad.

[0013] In some embodiments, the radius of the ball is equal to the radius of the sliding groove.

[0014] In some embodiments, the sliding device comprises a mounting groove, a spring and a ball, the mounting groove is long strip-shaped and is arranged in the circumferential direction of the protective pad;

[0015] The protective pad is circular, the mounting groove is arranged in the radial direction of the protective pad, the spring is connected to the bottom wall of the mounting groove, the ball is connected to the end of the spring away from the bottom wall and is used for compressing or releasing the spring so that the spring can be extended or retracted in the mounting groove.

[0016] The free length of the spring plus the diameter of the ball is greater than the depth of the mounting groove.

[0017] In some embodiments, the sliding device further comprises an arc piece, the arc piece is connected to the end of the spring away from the bottom wall, the center of the arc piece is located on the side away from the spring, and the ball is connected to the arc piece.

[0018] In some embodiments, the diameter of the arc piece is greater than the diameter of the ball, and the ball is limited in the arc piece.

[0019] In some embodiments, the sliding device has a plurality of and is arranged in the circumferential direction of the protective pad at intervals, and the center of the protective pad is consistent with the axis of the core tube body.

[0020] In some embodiments, the mounting gap is 0.8-2cm.

[0021] The technical scheme provided by the application has the beneficial effects of:

[0022] The engineering survey core tube provided by the embodiments of the application has the beneficial effects of:

[0023] The protection pad has an installation gap between the protection pad and the inner wall of the core tube, and the protection pad is movably arranged in the core tube body through the sliding device. During drilling, the protection pad is lifted with the increase of the core taken in the core tube body, and is always located on the top surface of the core, so that the water flow does not directly wash the core during drilling and core taking, but flows through the installation gap, thereby solving the problem of low core taking rate caused by the fact that the existing core tube is easily washed away by the washing liquid in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The structural schematic diagram of the core tube for engineering investigation provided by the embodiment of the present application is shown in the figure.

[0026] Figure 2 The cooperation schematic diagram of the sliding device and the sliding groove provided by the embodiment of the present application is shown in the figure.

[0027] Figure 3 The top view of the cooperation of the sliding device and the sliding groove provided by the embodiment of the present application is shown in the figure.

[0028] Figure 4 The partial schematic diagram of the cooperation of the sliding device and the sliding groove provided by the embodiment of the present application is shown in the figure.

[0029] Figure 5 The schematic diagram of the protection pad provided by the embodiment of the present application is shown in the figure.

[0030] In the figure: 1, core tube body; 11, outer wall of core tube; 12, inner wall of core tube; 2, core containing area; 21, first containing area; 22, second containing area; 23, clamping table; 3, protection pad; 4, sliding groove; 5, sliding device; 51, installation groove; 511, bottom wall; 52, ball; 53, spring; 54, circular arc piece; 6, core tube joint; 7, core; 8, drill bit; 9, installation gap. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] The embodiment of the present application provides an engineering investigation core tube which can solve the problem of low core collection rate caused by the fact that the existing core tube is easily washed away by flushing liquid in the prior art.

[0033] Referring to Figures 1 to 5 The embodiment of the present application provides an engineering investigation core tube, which comprises a core tube body 1 and a protective gasket 3, and specifically, in combination with Figure 1 The core tube body 1 is provided with a core containing area 2 for collecting cores, and in combination with Figure 2 The core containing area 2 comprises a first containing area 21 and a second containing area 22, and a clamping table 23 is arranged between the first containing area 21 and the second containing area 22, and specifically, the diameter of the first containing area 21 is greater than that of the second containing area 22.

[0034] Further, the core tube body 1 has a certain thickness to maintain strength during drilling, in combination with Figure 1 and Figure 2 The core tube body 1 comprises a core tube outer wall 11 and a core tube inner wall 12.

[0035] Further, in combination with Figures 1 to 4 The protective gasket 3 is movably arranged in the core tube body 1 through a sliding device 5 and is connected with the clamping table 23, and specifically, the protective gasket 3 is limited on the clamping table 23 and moves in the first containing area 21.

[0036] Since the diameter of the first containing area 21 is greater than that of the second containing area 22, and the clamping table is arranged between the first containing area 21 and the second containing area 22, in combination with Figure 1 and Figure 2 When the core tube body 1 collects the core 7, the core 7 enters the second containing area 22 from the drill bit 8 and lifts the protective gasket 3, and the core further enters the first containing area 21.

[0037] Further, in combination with Figure 3 and Figure 4 The protective gasket 3 has an installation gap 9 with the core tube inner wall 12, and the installation gap 9 is used for flushing liquid to flow through, thereby avoiding that the high-pressure water flow directly washes the core. Since the protective gasket 3 covers the upper surface of the core 7, on one hand, the protective gasket 3 provides a buffer for the flushing liquid coming from the core tube joint 6, so that the water flow flows out from the installation gap 9 and direct washing by the high-pressure water flow is avoided, and on the other hand, the water pressure is uniformly applied to the inside of the core, thereby ensuring the integrity of the core when the core is washed out by the water pressure.

[0038] The embodiment of the present application provides a kind of engineering investigation core tube, since core tube body is provided with core containing area 2, core containing area 2 is divided into two parts, and the two parts are provided with clamping table 23, protective gasket 3 is movably arranged in core tube body 1, and it is connected with clamping table 23, i.e. limit in clamping table 23, so that protective gasket 3 cannot fall from core tube body 1 due to its own gravity during the process of lowering drilling tool;

[0039] Another aspect protective gasket 3 and the installation gap 9 between core tube inner wall 12, and protective gasket 3 is movably arranged in core tube body 1 by sliding device 5, in the process of drilling, protective gasket 3 is lifted with the increase of core 7 taken in core tube body 1, and always located on the top surface of core 7, ensure drilling and flushing core 7, water flow is not directly flushed to core 7, but flows from installation gap 9, therefore, it can solve the problem of low core collection rate in the prior art that existing core tube is easily washed away by flushing liquid.

[0040] In some optional embodiments, referring to Figure 1 And Figure 2 As shown, along the axial direction of core tube body 1, sliding groove 4 is arranged on core tube inner wall 12, and sliding device 5 is slidably arranged on core tube inner wall 12 through sliding groove 4.

[0041] Optionally, one end of sliding groove 4 close to second containing area 22 is connected with clamping table 23, and the other end of sliding groove 4 extends to the joint between core tube body 1 and core tube joint 6, so that core 7 can be collected to fill the entire core containing area 2, to ensure the collection efficiency of core 7. Specifically, since clamping table 23 is located at the junction of first containing area 21 and second containing area 22, sliding groove 4 is arranged in first containing area 21.

[0042] For the arrangement of sliding device 5, the present application provides three embodiments.

[0043] Embodiment one: combined with Figure 1 As shown, along the axial direction of core tube body 1, sliding groove 4 is arranged on core tube inner wall 12;

[0044] Combined with Figure 3 And Figure 4 As shown, sliding device 5 includes mounting groove 51, short rod and ball 52, mounting groove 51 is arranged in the circumferential direction of protective gasket 3, ball 52 is fixed in mounting groove 51 through short rod, and ball 52 is slidably arranged in sliding groove 4.

[0045] Specifically, the short rod can be arranged in the mounting groove 51 along the axial direction of the mounting groove 51, and the ball 52 is arranged at the end of the short rod away from the mounting bottom wall 511, at this time, the ball 52 is not rollable, and the ball 52 and the sliding groove 4 are in sliding friction when the core 7 lifts the protection pad 3 up. Preferably, the sliding groove 4 is circular arc-shaped, and the surface of the sliding groove 4 is matched with the arc of the outer surface of the ball 52.

[0046] Further, the protection pad 3 is circular, and the distance from the end of the ball 52 away from the center of the protection pad 3 to the center of the protection pad 3 is greater than the radius of the protection pad 3, and the ball 52 is arranged in the sliding groove 4, and the protection pad 3 can slide along the length direction of the sliding groove 4.

[0047] Alternatively, the short rod is arranged on the two side walls of the mounting groove 51 and passes through the ball 52, the ball 52 can rotate around the short rod as the rotating shaft, and the rotating shaft is perpendicular to the length direction of the sliding groove 4; when the core 7 lifts the protection pad 3 up, the ball 52 and the sliding groove 4 are in rolling friction, and preferably, the sliding groove 4 is circular arc-shaped, and the surface of the sliding groove 4 is matched with the arc of the outer surface of the ball 52.

[0048] Preferably, the radius of the ball 52 is equal to the radius of the sliding groove 4.

[0049] Embodiment two: in combination with Figure 1 As shown, along the axial direction of the core barrel body 1, the sliding groove 4 is arranged on the inner wall 12 of the core barrel;

[0050] In combination with Figures 2 to 4 As shown, the sliding device 5 includes a mounting groove 51, a spring 53 and a ball 52, the mounting groove 51 is long strip-shaped and is arranged on the protection pad 3 in the circumferential direction;

[0051] In combination with Figure 3 As shown, the protection pad 3 is circular, the mounting groove 51 is arranged along the radial direction of the protection pad 3, the spring 53 is connected to the bottom wall 511 of the mounting groove 51, and the ball 52 is connected to the end of the spring 53 away from the bottom wall 511 and is used to compress or release the spring 53, so that the spring 53 can stretch or contract in the mounting groove 51;

[0052] Further, the free length of the spring 53 plus the diameter of the ball 52 is greater than the depth of the mounting groove 51, that is, in the free state of the spring 53, the ball 52 is exposed outside the mounting groove 51, when the protection pad 3 is located in the core barrel body 1, in combination with Figure 4 As shown, the spring 53 is pressed, the ball 52 abuts against the sliding groove 4 and can be limited at the clamping table 23, so as to prevent the protection pad 3 from falling during the drilling process. At this time, the ball 52 is not rollable, and the ball 52 and the sliding groove 4 are in sliding friction when the core 7 lifts the protection pad 3 up.

[0053] Embodiment three: the difference between the embodiment three and the embodiment two is thatFigure 4 As shown, the sliding device 5 also includes an arc plate 54, which is connected to the end of the spring 53 away from the bottom wall 511, and the center of the arc plate 54 is located on the side away from the spring 53. The ball 52 is connected to the arc plate 54.

[0054] Specifically, Figure 4 As shown in the cross-sectional view, the arc plate 54 exhibits an arc shape in the cross-section to limit the ball 52 within the arc plate 54. The diameter of the arc plate 54 is slightly larger than the diameter of the ball 52, for example, it can be 1 to 2 mm. The ball 52 can roll within the arc plate 54 to achieve rolling friction with the groove 4.

[0055] In some alternative embodiments, see Figure 2 and Figure 3 As shown, there are multiple sliding devices 5, which are spaced apart in the circumferential direction of the protective pad 3, and the center of the protective pad 3 is consistent with the axis of the core tube body 1.

[0056] Preferably, combined with Figure 3 As shown, there are four sliding devices 5, which are evenly spaced around the circumference of the protective pad 3 to ensure that the protective pad 3 can be kept in the center position in the core tube body 1.

[0057] Combination Figure 5 As shown, the protective pad 3 has four mounting slots 51 for mounting the sliding device 5.

[0058] In some optional embodiments, the installation gap 9 is 0.8–2 cm. Preferably, the installation gap 9 is 1 cm to ensure that the circulating fluid can pass between the protective gasket 3 and the inner wall 12 of the core tube.

[0059] In some optional embodiments, the ball bearing 52 should be made of stainless steel to prevent rusting caused by long-term immersion in water; furthermore, the protective pad 3 can be made of stainless steel to prevent rusting while also having a suitable weight to ensure that when the core tube body 1 is upright, the protective pad 3 can slide down to the bottom of the chute 4 (i.e., the mounting plate 23) by its own weight.

[0060] Specifically, this application provides a method for manufacturing a core tube for engineering exploration, comprising the following steps:

[0061] S1. Process the core tube body 1 by cutting the steel pipe original according to the design dimensions, grinding and polishing the cut position, and machining threads at both ends to form the core tube body 1.

[0062] S2. Four symmetrical grooves 4 are made on the inner wall 12 of the core tube;

[0063] S3. Grind and polish the groove 4 to ensure that the inner wall of the groove 4 is smooth.

[0064] S4. Cut out a circular piece with a diameter about 1 cm smaller than the inner diameter of the corresponding core tube body 1 from a stainless steel plate with a thickness of 1.5 cm, and polish the cut surface to form a protective gasket 3.

[0065] S5. Four mounting grooves 51 are punched at symmetrical positions on the side wall of the protective gasket 3;

[0066] S6. Install spring 53, arc plate 54, and ball bearing 52 in the installed slot 51.

[0067] S7. Fill the groove 4 with lubricating oil to ensure that the ball 52 can slide freely in the groove 4;

[0068] S8. Install the completed protective gasket 3 into the core tube body 1 accordingly;

[0069] S9. Connect the core tube connector 6 and drill bit 8 to the core tube body 1 and seal them.

[0070] This application provides an engineering exploration core tube. Because a protective gasket 3 is provided inside the core tube body 1, it prevents the drilling fluid from directly eroding the retrieved core 7 during drilling and core extraction, greatly improving the core recovery rate and reducing rework due to insufficient recovery. Furthermore, the equipment has a simple structure and is easy to manufacture.

[0071] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0072] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0073] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An engineering investigation core tube, characterized by, It comprises: The core tube body (1) is provided with a core containing area (2), which comprises a first containing area (21) and a second containing area (22), and a clamping table (23) is arranged between the first containing area (21) and the second containing area (22), and the core tube body (1) comprises a core tube inner wall (12); A protective pad (3) is movably arranged in the core tube body (1) by a sliding device (5) and is connected with the clamping table (23), and a mounting gap (9) is formed between the protective pad (3) and the core tube inner wall (12), which is used for the flow of flushing liquid to avoid direct flushing of high-pressure water flow to the core; The sliding device (5) comprises a mounting groove (51), a spring (53) and a ball (52), the mounting groove (51) is long strip-shaped and is arranged on the circumference of the protective pad (3); The protective pad (3) is circular, the mounting groove (51) is arranged along the radial direction of the protective pad (3), the spring (53) is connected to the bottom wall (511) of the mounting groove (51), the ball (52) is connected to the end of the spring (53) away from the bottom wall (511) and is used for compressing or releasing the spring (53), so that the spring (53) can be stretched or retracted in the mounting groove (51); The sum of the free length of the spring (53) and the diameter of the ball (52) is greater than the depth of the mounting groove (51).

2. The engineering investigation core tube according to claim 1, wherein: Along the axial direction of the core tube body (1), a sliding groove (4) is arranged on the core tube inner wall (12), and the sliding device (5) is slidably arranged on the core tube inner wall (12) through the sliding groove (4).

3. The engineering investigation core tube according to claim 2, wherein: The sliding groove (4) is arranged in the first containing area (21).

4. The engineering investigation core tube according to claim 1, wherein: The sliding device (5) further comprises a circular arc piece (54), the circular arc piece (54) is connected to the end of the spring (53) away from the bottom wall (511), the center of the circular arc piece (54) is located on the side away from the spring (53), and the ball (52) is connected to the circular arc piece (54).

5. The engineering investigation core tube according to claim 4, wherein: The diameter of the circular arc piece (54) is greater than the diameter of the ball (52), and the ball (52) is limited in the circular arc piece (54).

6. The engineering investigation core tube according to claim 1, wherein: A plurality of sliding devices (5) are arranged on the circumference of the protective pad (3) at intervals, and the center of the protective pad (3) is consistent with the axis of the core tube body (1).

7. The engineering investigation core tube according to claim 1, wherein: The mounting gap (9) is 0.8-2 cm.

Images