Deep mud sampling device for cast-in-situ bored pile

Abstract

The utility model discloses a deep mud sampling device for a cast-in-situ bored pile, which relates to the field of building construction, and adopts the technical scheme that the deep mud sampling device comprises a cylindrical sampling barrel, an opening is formed in the lower end of the sampling barrel, and the diameter of the opening is smaller than the inner diameter of the sampling barrel; an adapter frame is fixedly arranged on the upper surface of the sampling barrel, and a pull rope is fixedly arranged on the adapter frame; a self-shrinking mechanism is arranged in the sampling barrel and comprises a piston arranged in the sampling barrel, the diameter of the piston is larger than that of the opening, a spring is fixedly arranged on the piston, a connector is arranged at the lower end of the piston, and the connector is detachably connected with a balancing weight. The sampling device has the beneficial effects that samples at specified positions can be taken through the spring, the stability is high, less or more samples can be taken, the operation is simple, the sampling device is easy to use by workers, the phenomenon of improper use of operators due to technical problems is avoided, and the site construction requirement is met.

Description

Technical Field

[0001] The utility model relates to the field of building construction, in particular to a deep mud sampling device for bored piles. Background Art

[0002] Bored piles are a critical foundation project, and their quality directly impacts the overall project. They are widely used in infrastructure construction, including buildings and bridges. However, the quality of bored piles is significantly affected by the properties of the slurry during the borehole construction phase, particularly after hole cleaning prior to concrete pouring. The quality of bored piles is affected by slurry properties because the slurry during bored pile construction is a suspension, with sand particles in the soil layer present as solid suspended matter and clay minerals in colloidal form. The sand content of the slurry is directly affected by the ratio of the former, while the specific gravity of the slurry is determined by the sum of the two. When the slurry in the bored pile hole is static—that is, during the withdrawal of drilling equipment, installation of the rebar cage and conduit, and concrete pouring—solid sand particles and colloidal clay minerals can settle at the bottom of the hole, increasing the thickness of the bottom sediment and seriously affecting the quality of the bored pile. In order to control the quality of bored cast-in-place piles, my country's "Technical Specifications for Building Pile Foundations" and other relevant specifications stipulate the mud index at the hole mouth and the mud index at the bottom of the hole. The hole mouth index is an extrapolation of the index at the bottom of the hole, and the mud index at the bottom of the pile can directly evaluate the sedimentation state of the mud. Therefore, directly measuring the mud index at the bottom of the hole is crucial to the quality of bored cast-in-place piles.

[0003] Regarding the existing invention: a mud sampling tool for the bottom of a bored pile hole (application number CN202020859668.2), its structure includes a bottle body and an auxiliary mechanism. By setting an auxiliary mechanism on the top of the bottle mouth, the pull rope is held to slowly lower the equipment into the bored pile hole. When the bottom of the supporting foot is against the bottom of the hole, the metal block drives the sealing plate to fall to the bottom of the bottle body, and the mud at the bottom of the hole flows into the bottle body to complete the sampling. However, this sampling method has low stability in sample collection, small sampling volume, heavy device and not labor-saving, and the sampling results are greatly affected by the skill level of the operator.

[0004] To ensure the effectiveness of bored pile sampling, the following two aspects must be determined: 1. When the sampling device is placed in the hole, to ensure that the mud in the specified area is sampled, the sampling device must be open in the specified position and closed in all other positions. 2. High stability is required, so that the sampling results are not affected by the sampling personnel's range, and the mud collected in a single sampling should meet the one-time requirements of the mud-related tests. Utility Model Content

[0005] In view of the above technical problems, the utility model provides a deep mud sampling device for bored cast-in-place piles.

[0006] The technical solution is as follows: it comprises a circular cylindrical sampling tube, the lower end of which is provided with an opening, the diameter of which is smaller than the inner diameter of the sampling tube; an adapter frame is fixedly provided on the upper surface of the sampling tube, and a pull rope is fixedly provided on the adapter frame;

[0007] A self-retracting mechanism is provided in the sampling cylinder, and the self-retracting mechanism includes a piston provided inside the sampling cylinder, the diameter of the piston is larger than the diameter of the opening, a spring is fixed on the piston, and a joint is provided at the lower end of the piston, and the joint is detachably connected to a counterweight block.

[0008] Preferably, an adjusting sleeve is fixedly provided at the upper end of the spring, a threaded hole is provided in the middle of the adjusting sleeve, an adjusting screw is threadedly connected in the threaded hole, and the adjusting screw is rotatably connected to the middle of the upper end of the sampling cylinder;

[0009] The upper end portion of the adjusting screw extends to the outside of the sampling cylinder and is fixed with a knob.

[0010] Preferably, the joint includes a mounting seat fixedly provided on the piston, a socket is provided in the middle of the mounting seat, a limit plate is slidably provided on the upper end of the mounting seat, the limit plate is L-shaped, the horizontal portion of the limit plate is slidably connected to the mounting seat, and a return spring is provided between the vertical portion of the limit plate and the mounting seat;

[0011] A limiting groove is provided on the horizontal portion of the limiting plate.

[0012] Preferably, the counterweight block is rectangular, an insertion rod is fixedly provided on the upper surface of the counterweight block, a slot is provided at the upper end of the insertion rod, and the slot is engaged with the limiting plate.

[0013] Preferably, a rubber pad is provided on the side of the piston facing away from the spring.

[0014] The beneficial effects of the technical solution provided by the embodiment of the utility model are: samples at a specified position can be taken through the spring, and it has high stability, can take a small or large amount of samples, is simple to operate, and is easy for workers to use. There is no phenomenon of improper use by operators due to technical problems, and the requirements of on-site construction are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] Figure 2 It is a cross-sectional view of the overall structure of an embodiment of the present utility model.

[0017] Figure 3 Schematic diagram of the self-retracting mechanism of an embodiment of the present utility model.

[0018] Figure 4 Schematic diagram of a connector according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of a counterweight block according to an embodiment of the present invention.

[0020] Among them, the accompanying drawings are marked as: 1. sampling tube; 2. opening; 3. adapter frame; 4. pull rope; 5. self-retracting mechanism; 6. piston; 7. spring; 8. joint; 9. counterweight; 10. adjusting sleeve; 11. adjusting screw; 12. knob; 13. mounting seat; 14. limit plate; 15. plug rod; 16. slot. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. A person skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0025] Example 1

[0026] See also Figures 1 to 5 The utility model provides a deep mud sampling device for bored piles, comprising a circular cylindrical sampling tube 1, an opening 2 being provided at the lower end of the sampling tube 1, the diameter of the opening 2 being smaller than the inner diameter of the sampling tube 1; an adapter frame 3 being fixedly provided on the upper surface of the sampling tube 1, a pull rope 4 being fixedly provided on the adapter frame 3;

[0027] A self-retracting mechanism 5 is provided in the sampling tube 1, and the self-retracting mechanism 5 includes a piston 6 provided inside the sampling tube 1, the diameter of the piston 6 is larger than the diameter of the opening 2, a spring 7 is fixed on the piston 6, and a joint 8 is provided at the lower end of the piston 6, and the joint 8 is detachably connected to a counterweight block 9.

[0028] Hold the pull rope 4 and slowly place the sampling tube 1 into the pile hole of the bored pile. During the placement process, pay attention to keep the pull rope 4 stable to prevent the sampling device from shaking or colliding with the pile hole wall;

[0029] As the sampling tube 1 sinks, when the sampling tube 1 reaches the deep mud, due to the pressure of the mud, the piston 6 will move upward and compress the spring 7. At this time, negative pressure is formed inside the sampling tube 1, and the deep mud will enter the sampling tube 1 through the opening 2 at the lower end of the sampling tube 1.

[0030] Then slowly pull up the pull rope 4 to remove the sampling tube 1 from the pile hole. During the removal process, the spring 7 will gradually return to its original state, pushing the piston 6 to move downward to block the opening 2 at the lower end of the sampling tube 1;

[0031] After the sampling tube 1 is completely taken out of the pile hole, the slurry in the sampling tube 1 is poured into a dedicated container for subsequent detection and analysis.

[0032] The joint 8 includes a mounting base 13 fixedly mounted on the piston 6, a socket being provided in the middle of the mounting base 13, a limit plate 14 being slidably provided on the upper end of the mounting base 13, and an "L"-shaped limit plate 14, the horizontal portion of which is slidably connected to the mounting base 13, and a return spring being provided between the vertical portion of the limit plate 14 and the mounting base 13;

[0033] A limiting groove is provided on the horizontal portion of the limiting plate 14 .

[0034] The counterweight block 9 is rectangular, and an insertion rod 15 is fixedly provided on the upper surface of the counterweight block 9 . A slot 16 is provided at the upper end of the insertion rod 15 , and the slot 16 is engaged with the limiting plate 14 .

[0035] When the insertion rod 15 is inserted into the socket of the mounting seat 13 and the horizontal part of the limit plate 14 is inserted into the slot, when the counterweight 9 needs to be removed, the user presses the vertical part of the limit plate 14, and the horizontal part of the limit plate 14 slides on the upper surface of the mounting seat 13, separating the limit plate 14 from the slot. At this time, the user can move the insertion rod 15 to separate the counterweight 9 from the piston 6.

[0036] This design improves the efficiency of assembly and disassembly of the sampling tube 1 and the counterweight 9, makes it easy to disassemble the counterweight 9 and the connector 8 after use, clean the various components of the sampling tube 1, especially the piston 6, the sampling tube 1 and the spring 7, remove mud residues, and keep the device clean and dry.

[0037] A rubber pad is provided on the side of the piston 6 facing away from the spring 7 .

[0038] When the utility model is used, the pull rope 4 is held and the sampling tube 1 is slowly placed into the pile hole of the bored pile. During the placement process, attention should be paid to keeping the pull rope 4 stable to prevent the sampling device from shaking or colliding with the pile hole wall;

[0039] As the sampling tube 1 sinks, when the sampling tube 1 reaches the deep mud, due to the pressure of the mud, the piston 6 will move upward and compress the spring 7. At this time, negative pressure is formed inside the sampling tube 1, and the deep mud will enter the sampling tube 1 through the opening 2 at the lower end of the sampling tube 1.

[0040] Then slowly pull up the pull rope 4 to remove the sampling tube 1 from the pile hole. During the removal process, the spring 7 will gradually return to its original state, pushing the piston 6 to move downward to block the opening 2 at the lower end of the sampling tube 1;

[0041] After the sampling tube 1 is completely taken out of the pile hole, the slurry in the sampling tube 1 is poured into a dedicated container for subsequent detection and analysis.

[0042] Example 2

[0043] On the basis of Example 1, an adjusting sleeve 10 is fixedly provided at the upper end of the spring 7, a threaded hole is provided in the middle of the adjusting sleeve 10, an adjusting screw 11 is threadedly connected in the threaded hole, and the adjusting screw 11 is rotatably connected to the middle of the upper end of the sampling tube 1;

[0044] The upper end of the adjusting screw 11 extends to the outside of the sampling tube 1 and is fixed with a knob 12 .

[0045] When sampling is required for a pile hole of a certain depth, the sampling tube 1 with the counterweight 9 cannot be opened automatically, resulting in that mud cannot enter the sampling tube 1 .

[0046] Before placing the sampling tube 1 into the pile hole, the operator can manually adjust the elastic coefficient of the spring 7 according to the actual depth to be sampled, and adjust the position of the sleeve 10 by turning the knob 12;

[0047] For example, when the mud pressure is expected to be high, the elastic coefficient of the spring 7 can be increased by rotating the adjustment knob 12 to prevent the piston 6 from rising prematurely before reaching the specified depth, resulting in inaccurate sampling.

[0048] Since the mud pressure at different depths is different, the elastic coefficient can be adjusted according to the actual pressure conditions through the adjustable spring 7 to ensure that the piston 6 moves at the appropriate position, so that the inside of the sampling tube 1 always maintains a stable negative pressure state, thereby improving the accuracy of sampling.

[0049] The adjustable spring 7 enables the sampling device to adapt to different pile hole depths and mud conditions, expanding the application range of the device; whether in shallow or deep holes, high pressure or low pressure mud environments, good sampling results can be achieved by adjusting the spring 7.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A deep mud sampling device for bored piles, characterized in that: The invention comprises a circular cylindrical sampling tube (1), wherein an opening (2) is provided at the lower end of the sampling tube (1), and the diameter of the opening (2) is smaller than the inner diameter of the sampling tube (1); an adapter frame (3) is fixedly provided on the upper surface of the sampling tube (1), and a pull rope (4) is fixedly provided on the adapter frame (3); A self-retracting mechanism (5) is provided in the sampling cylinder (1), and the self-retracting mechanism (5) comprises a piston (6) provided inside the sampling cylinder (1), the diameter of the piston (6) being larger than the diameter of the opening (2), a spring (7) being fixedly provided on the piston (6), and a joint (8) being provided at the lower end of the piston (6), and the joint (8) being detachably connected to a counterweight block (9).

2. The deep mud sampling device for bored piles according to claim 1, characterized in that: An adjusting sleeve (10) is fixedly provided at the upper end of the spring (7), a threaded hole is provided in the middle of the adjusting sleeve (10), an adjusting screw (11) is threadedly connected in the threaded hole, and the adjusting screw (11) is rotatably connected to the middle of the upper end of the sampling tube (1); The upper end of the adjusting screw (11) extends to the outside of the sampling cylinder (1) and is fixedly provided with a knob (12).

3. The deep mud sampling device for bored piles according to claim 2, characterized in that: The joint (8) includes a mounting seat (13) fixedly arranged on the piston (6), a socket is arranged in the middle of the mounting seat (13), a limit plate (14) is slidably arranged on the upper end of the mounting seat (13), the limit plate (14) is "L"-shaped, the horizontal portion of the limit plate (14) is slidably connected to the mounting seat (13), and a return spring is arranged between the vertical portion of the limit plate (14) and the mounting seat (13); A limiting groove is provided on the horizontal portion of the limiting plate (14).

4. The deep mud sampling device for bored piles according to claim 3 is characterized in that: The counterweight block (9) is rectangular, and an insertion rod (15) is fixedly provided on the upper surface of the counterweight block (9). A slot (16) is provided at the upper end of the insertion rod (15), and the slot (16) is engaged with the limiting plate (14).

5. The deep mud sampling device for bored piles according to claim 2, characterized in that: A rubber pad is provided on the side of the piston (6) facing away from the spring (7).

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