Multi-depth Mud Sampling Device for Bored Cast-in-place Piles

Abstract

The present application provides a multi-depth mud sampling device for bored cast-in-place piles, which includes a cylinder body. A storage cavity is provided inside the cylinder body. The storage cavity is provided with a feed check valve and a discharge valve. A slidable piston member is provided inside the storage cavity. A main spindle rod is also provided. The piston member is connected to the main spindle rod. A towing rope is provided at the upper end of the cylinder body, and a cable is provided at the upper end of the main spindle rod. The problem of multi-depth sampling of the pile holes of bored cast-in-place piles is solved. The depth of the cylinder body is controlled by the towing rope, and the sampling operation is realized by pulling the cable. The full coverage of mud sampling at different depths of the cast-in-place pile can be achieved, the difficulty of the sampling operation is reduced, and the sampling efficiency and accuracy are improved.

Description

Technical Field

[0001] The present invention relates to the field of bored pile construction, and in particular to a multi-depth mud sampling device for bored cast-in-place piles. Background Art

[0002] In the construction fields such as highways, railways, municipal engineering, building construction, water conservancy, petrochemical industry, etc., the construction of bored cast-in-place piles is widely applied. The drilling mud of the cast-in-place pile plays roles such as consolidating the hole wall, suspending the drill cuttings, lubricating and cooling the drill bit, etc. Before drilling, mud with corresponding performance indexes needs to be prepared according to the drilling method and soil layer conditions to ensure the quality of the hole wall; after hole cleaning, it is necessary to judge the effect of hole cleaning through the performance indexes of the mud to ensure the pouring quality of underwater concrete. The detection of the performance indexes of the mud is determined through mud sampling tests at different depths on site.

[0003] The traditional mud sampling method is to collect the mud extracted from the bottom of the hole or overflowing from the hole mouth by equipment, and then use mud detection equipment for detection. The detected indexes can only reflect the mud performance at the bottom of the hole or the hole mouth, and it is difficult to comprehensively and integrally reflect the mud performance at different depths, resulting in a large deviation in the judgment result. Summary of the Invention

[0004] The present invention provides a multi-depth mud sampling device for bored cast-in-place piles, which solves the problem of multi-depth sampling of the bored cast-in-place pile hole.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a multi-depth mud sampling device for bored cast-in-place piles, including a cylinder body. A storage cavity is provided inside the cylinder body. The storage cavity is provided with a feed check valve and a discharge valve. A slidable piston member is provided inside the storage cavity. A main shaft rod is also provided. The piston member is connected to the main shaft rod. A towing rope is provided at the upper end of the cylinder body, and a cable is provided at the upper end of the main shaft rod.

[0006] In a preferred solution, the piston member includes a rigid member. Upper and lower rubber sealing rings are provided on both sides of the rigid member. A main shaft rod thread is provided at the lower end of the main shaft rod. An upper mouth fastening bolt and a lower mouth fastening bolt are sleeved on the main shaft rod thread. The upper mouth fastening bolt and the lower mouth fastening bolt clamp the upper rubber sealing ring, the rigid member and the lower rubber sealing ring.

[0007] In a preferred solution, a plurality of storage cavities are provided along the height direction of the cylinder body. A partition is provided between adjacent storage cavities. The piston member includes a central shaft. A plurality of piston plates are connected to the outer wall of the central shaft. Each piston plate is arranged in each storage cavity. The central shaft is connected to the main shaft rod.

[0008] In a preferred solution, the central shaft is a hollow multi-section telescopic structure. Each piston plate is sleeved on each section of the central shaft. A slidable inner sliding plug is provided inside the central shaft. The inner sliding plug is sequentially connected to each section of the central shaft to drive each piston plate to move sequentially.

[0009] In a preferred embodiment, the central shaft includes a first shaft section, a second shaft section, and a third shaft section that are sequentially sleeved and slidable. An inner sleeve is provided at the upper end of the second shaft section. Inner extending pins are provided on the inner walls of the upper ends of the first shaft section and the inner sleeve. The pins are retractable and are used to stop the inner sliding plug or retract inward to allow the inner sliding plug to pass through.

[0010] In a preferred embodiment, a convex ring is provided at the lower end of the inner sleeve. Ring grooves are provided on the upper end surfaces of the first shaft section and the inner sleeve. The pin is provided with a conical surface, and the convex ring presses against the conical surface of the pin to cause the pin to retract laterally.

[0011] In a preferred embodiment, a plurality of radially penetrating holes are provided along the circumferential direction on the inner walls of the upper ends of the first shaft section and the inner sleeve. Each pin is disposed in each radially penetrating hole. A plug is provided at one end of the radially penetrating hole, and a spring is provided between the pin and the plug.

[0012] In a preferred embodiment, a stop baffle is provided on the inner wall of each storage cavity, and the stop baffle is used to stop the piston plate.

[0013] In a preferred embodiment, a one-way exhaust valve is provided near the upper end in each storage cavity.

[0014] In a preferred embodiment, a cylinder cap is provided at the upper end of the cylinder body. The cylinder body is provided with a cylinder body thread, and the cylinder body is threadedly connected to the cylinder cap. A connecting ring is provided on the cylinder cap, and the connecting ring is connected to the towing rope.

[0015] The beneficial effects of the present invention are as follows: The depth of the cylinder body is controlled by the towing rope, and the sampling operation is achieved by pulling the cable. The full coverage of mud sampling at different depths of the cast-in-place pile can be realized, the difficulty of the sampling operation is reduced, and the sampling efficiency and accuracy are improved; the degree of structural integration is high, the operation is simple, which is beneficial to on-site actual application and turnover, and reduces the construction cost; in the preferred embodiment, pulling the cable once can sample mud samples in multiple different depth segments at the same position, further improving the sampling fineness and making the depth distribution of the samples more uniform and refined. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the drawings and embodiments.

[0017] Figure 1 is the front view of the present invention.

[0018] Figure 2 is the side view of the present invention.

[0019] Figure 3 is the assembly view of the present invention.

[0020] Figure 4 is the cross-sectional view of the central shaft of the present invention.

[0021] Figure 5 is the enlarged view at A of the present invention.

[0022] Figure 6It is a schematic diagram of the first state of the central axis of the present invention.

[0023] Figure 7 It is a schematic diagram of the second state of the central axis of the present invention.

[0024] Figure 8 It is a schematic diagram of the third state of the central axis of the present invention.

[0025] Figure 9 It is a schematic diagram of the fourth state of the central axis of the present invention.

[0026] Figure 10 It is a schematic diagram of the fifth state of the central axis of the present invention.

[0027] Figure 11 It is a schematic diagram of the sixth state of the central axis of the present invention.

[0028] Figure 12 It is an enlarged view of part B of the present invention.

[0029] Figure 13 It is an enlarged view of part C of the present invention.

[0030] In the figure: slurry discharge port 1; lower discharge valve 2; cylinder support 3; cylinder body 4; storage cavity 401; partition 402; stop baffle 403; first shaft joint 404; second shaft joint 405; third shaft joint 406; side check valve 407; one-way exhaust valve 408; piston plate 409; inner sliding plug 410; pin 411; spring 412; inner sleeve 413; convex ring 414; plug 415; ring groove 416; side discharge valve 417; cylinder cap 5; lower check valve 6; cylinder body thread 7; upper rubber sealing ring 8; rigid member 9; lower rubber sealing ring 10; main shaft rod 11; main shaft rod thread 12; upper fastening bolt 13; lower fastening bolt 14; first connecting ring 15; second connecting ring 16; main shaft rod pull ring 17; first towing rope 18; second towing rope 19; cable 20. Detailed implementation manners

[0031] As Figures 1 - 13 In [a certain reference], a multi-depth mud sampling device for bored cast-in-place piles includes a cylinder body 4. A storage cavity 401 is provided inside the cylinder body 4. The storage cavity 401 is provided with a feed check valve and a discharge valve. A slidable piston member is provided inside the storage cavity 401. A main shaft rod 11 is also provided. The piston member is connected to the main shaft rod 11. The upper end of the cylinder body 4 is provided with a first towing rope 18 and a second towing rope 19. The upper end of the main shaft rod 11 is provided with a main shaft rod pull ring 17. The pull ring 17 is connected to a cable 20.

[0032] In a preferred solution, the upper end of the cylinder body 4 is provided with a cylinder cap 5. The cylinder body 4 is provided with a cylinder body thread 7. The cylinder body 4 is threadedly connected to the cylinder cap 5. The cylinder cap 5 is provided with a first connecting ring 15 and a second connecting ring 16. The first connecting ring 15 is connected to the first towing rope 18. The second connecting ring 16 is connected to the second towing rope 19.

[0033] In a preferred embodiment, when there is a single storage chamber 401, the piston member is conical and includes a rigid member 9. Upper and lower rubber sealing rings 8 and 10 are provided on both sides of the rigid member 9. A spindle rod thread 12 is provided at the lower end of the spindle rod 11. An upper mouth fastening bolt 13 and a lower mouth fastening bolt 14 are sleeved on the spindle rod thread 12. The upper mouth fastening bolt 13 and the lower mouth fastening bolt 14 clamp the upper rubber sealing ring 8, the rigid member 9, and the lower rubber sealing ring 10. A cylinder support 3 matching the piston member is provided at the lower end of the cylinder body 4. A check valve 6 for one-way feeding communicating with the storage chamber 401 is provided on the cylinder support 3, and a slurry discharge port 1 facing downward is provided. A lower discharge valve 2 is provided at the slurry discharge port 1. The lower discharge valve 2 is a ball valve, which is closed during sampling and can be manually opened to discharge the slurry after sampling is completed.

[0034] In a preferred embodiment, when there are multiple storage chambers 401 arranged along the height direction of the cylinder body 4, a partition 402 is provided between adjacent storage chambers 401. The piston member includes a central shaft, and a plurality of piston plates 409 are connected to the outer wall of the central shaft. Each piston plate 409 is arranged in each storage chamber 401. The central shaft is connected to the spindle rod 11. A side check valve 407 and a side discharge valve 417 are provided near the lower end of each storage chamber 401. The side check valve 407 is used for one-way feeding, and the side discharge valve 417 is a ball valve for manually discharging the material after sampling is completed.

[0035] A one-way exhaust valve 408 is provided near the upper end of each storage chamber 401 for discharging air and balancing the air pressure during sampling.

[0036] There are at least two storage chambers 401 in the height direction. The spindle rod 11 pulls the central shaft, and each piston plate 409 moves upward simultaneously, so that mud samples at different depths can be sucked.

[0037] To improve the sealing performance, the side wall of the piston plate 409 fits closely with the inner wall of the storage chamber 401, and there is a certain frictional resistance during relative movement. The mud has a high viscosity and poor fluidity, and there is also a certain resistance during sampling and sucking. Therefore, although multi-chamber simultaneous sucking is efficient, when the number of storage chambers 401 is large, there may be a situation where it cannot be pulled. Therefore, in a preferred embodiment, the central shaft adopts a hollow multi-section telescopic structure. Each piston plate 409 is sleeved on each section of the central shaft. A slidable inner plug 410 is provided inside the central shaft. The inner plug 410 is sequentially connected to each section of the central shaft to drive each piston plate 409 to move sequentially. By pulling the cable once, sampling operations can be performed on multiple consecutive heights. However, the sampling is sequential, and the piston plates 409 from bottom to top move upward in sequence, avoiding the situation where the resistance of the piston plates 409 moving upward simultaneously is too large.

[0038] A stop plate 403 is provided on the inner wall of each storage chamber 401. The stop plate 403 is used to stop the piston plate 409. The piston plate 409 moves upward to absorb mud. When the capacity limit is reached, it is stopped by the stop plate 403, and the inner sliding plug 410 switches to connect with the adjacent upper telescopic joint.

[0039] In the preferred embodiment, the central shaft includes a first shaft section 404, a second shaft section 405 and a third shaft section 406 which are slidably sleeved in sequence. An inner sleeve 413 is provided at the upper end of the second shaft section 405. The inner wall diameter of the inner sleeve 413 is equal to or similar to the inner wall diameter of the first shaft section 404. An inwardly extending bayonet 411 is provided on the inner wall of the upper end of the first shaft section 404 and the inner wall of the inner sleeve 413. The bayonet 411 is retractable and is used to stop the inner sliding plug 410 or to retract to allow the inner sliding plug 410 to pass through. After passing through, the adjacent upper bayonet 411 blocks the inner sliding plug 410, and the inner sliding plug 410 can drive the upper shaft section to continue to move, thereby realizing switching connection between the shaft sections.

[0040] In the preferred embodiment, a convex ring 414 is provided at the lower end of the inner sleeve 413, an annular groove 416 is provided on the upper end surface of the first shaft section 404 and the inner sleeve 413, the bayonet 411 is a stepped shaft, and a conical surface is used for transition at the step. The thin shaft end of the bayonet 411 extends inward to the inner wall of the shaft section to block the inner sliding plug 410, and a chamfer is provided at the lower end of the convex ring 414. The convex ring 414 squeezes the conical surface of the bayonet 411 to make the bayonet 411 retract laterally outward, so that the sliding plug 410 can pass through.

[0041] In the preferred embodiment, a plurality of radial through holes are provided on the inner wall of the upper end of the first shaft section 404 and the inner wall of the inner sleeve 413 along the circumferential direction, and each bayonet 411 is provided in each radial through hole. A plug 415 is provided at one end of the radial through hole, and a spring 412 is provided between the bayonet 411 and the plug 415. The two ends of the spring 412 respectively abut against the bayonet 411 and the plug 415 to provide a retaining force for the bayonet 411 to reset.

[0042] When sampling mud, take the need to sample 3 different depth points as an example, the device is lowered into the hole. The lowering depth can be easily determined according to the length of the traction rope. After reaching the first sampling position, the traction rope hangs the cylinder body 4 to keep the position of the cylinder body 4 stable. Pull the cable 20 and the inner sliding plug 410 moves upward from the bottom end. Figure 7 , is blocked when it reaches the first latch 411; Figure 8 , the first shaft section 404 is pulled upward to absorb the mud until the upper end of the first shaft section 404 approaches the inner sleeve 413 of the second shaft section 405; Figure 9 , the convex ring 414 at the lower end of the inner sleeve 413 of the second shaft section 405 squeezes the conical surface of the bayonet 411 at the upper end of the first shaft section 404, causing the bayonet 411 to retract outward, and the inner sliding plug 410 continues to move upward to support the bayonet 411 of the inner sleeve 413 of the second shaft section 405; Figure 10, the inner sliding plug 410 pulls the second shaft section 405 upward to sample the mud in the second section; as the inner sliding plug 410 continues to move upward, the device sequentially samples the third section, the fourth section, and so on.

[0043] After sampling at the first sampling position, pull out the cylinder body 4, open each discharge valve to release the mud sample, and then place the cylinder body 4 at the second sampling position again and repeat the above operations.

[0044] Taking the cylinder body 4 having three storage cavities 401 as an example, when sampling at three points, nine-depth samples can be obtained in this sampling. If the lengths of each shaft section are longer, it can be considered as nine different required depths in the hole. Compared with the traditional device that can only sample at a single point, the sampling density is increased by three times; if the lengths of each shaft section are shorter, it can be considered as sampling three times at each of the three required depths. By comparing and analyzing and taking the average value, the sampling accuracy at this depth can be improved. That is to say, compared with the traditional device that can only sample at a single point, the sampling accuracy is greatly improved.

[0045] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A multi-depth mud sampling device for bored cast-in-place piles, characterized in that: It includes a cylinder body (4). A storage cavity (401) is provided inside the cylinder body (4). The storage cavity (401) is provided with a feed check valve and a discharge valve. A slidable piston member is provided inside the storage cavity (401). There is also a main shaft rod (11). The piston member is connected to the main shaft rod (11). A towing rope is provided at the upper end of the cylinder body (4), and a cable (20) is provided at the upper end of the main shaft rod (11). A plurality of storage cavities (401) are provided along the height direction of the cylinder body (4). A partition plate (402) is provided between adjacent storage cavities (401). The piston member includes a central shaft. A plurality of piston plates (409) are connected to the outer wall of the central shaft. Each piston plate (409) is arranged in each storage cavity (401). The central shaft is connected to the main shaft rod (11). A one-way exhaust valve (408) is provided near the upper end inside each storage cavity (401). The central shaft is a hollow multi-section telescopic structure. Each piston plate (409) is sleeved on each section of the central shaft. A slidable inner plug (410) is provided inside the central shaft. The inner plug (410) is sequentially connected to each section of the central shaft to drive each piston plate (409) to move sequentially. The central shaft includes a first shaft section (404), a second shaft section (405), and a third shaft section (406) that are sequentially slidably sleeved. An inner sleeve (413) is provided at the upper end of the second shaft section (405). Inner extending pins (411) are provided on the inner wall of the upper end of the first shaft section (404) and the inner wall of the inner sleeve (413). The pins (411) can be telescopic. A convex ring (414) is provided at the lower end of the inner sleeve (413). Ring grooves (416) are provided on the upper end surfaces of the first shaft section (404) and the inner sleeve (413). The pins (411) are provided with conical surfaces. The convex ring (414) presses the conical surfaces of the pins (411) to cause the pins (411) to retract laterally.

2. The multi-depth mud sampling device for bored cast-in-place piles according to claim 1, characterized in that: The piston member includes a rigid member (9). Upper and lower rubber sealing rings (8) and (10) are provided on both sides of the rigid member (9). A main shaft rod thread (12) is provided at the lower end of the main shaft rod (11). An upper mouth fastening bolt (13) and a lower mouth fastening bolt (14) are sleeved on the main shaft rod thread (12). The upper mouth fastening bolt (13) and the lower mouth fastening bolt (14) clamp the upper rubber sealing ring (8), the rigid member (9), and the lower rubber sealing ring (10).

3. The multi-depth mud sampling device for bored cast-in-place piles according to claim 1, characterized in that: A plurality of radially through holes are provided along the circumferential direction on the inner wall of the upper end of the first shaft section (404) and the inner wall of the inner sleeve (413). Each pin (411) is arranged in each radially through hole. A plug (415) is provided at one end of the radially through hole. A spring (412) is provided between the pin (411) and the plug (415).

4. The multi-depth mud sampling device for bored cast-in-place piles according to claim 3, characterized in that: A stop baffle (403) is provided on the inner wall of each storage cavity (401). The stop baffle (403) is used to stop the piston plate (409).

5. The multi-depth mud sampling device for bored cast-in-place piles according to claim 1, characterized in that: A cylinder cap (5) is provided at the upper end of the cylinder body (4). A cylinder body thread (7) is provided on the cylinder body (4). The cylinder body (4) is threadedly connected to the cylinder cap (5). A connecting ring is provided on the cylinder cap (5). The connecting ring is connected to the towing rope.

Images