A device for sampling cement slurry at the bottom of a cast-in-place pile hole

Abstract

The utility model discloses a device suitable for cast-in-situ pile hole bottom cement paste sampling belongs to pile foundation construction technical field, including sinking tube, the upper and lower end of sinking tube is respectively screw thread assembly and bottom cover, the sliding setting of sinking tube has top seal board, and the top of top seal board is connected with the pull rope, the middle bore of top cover is to the cement paste from top and is supplied with the pull rope and passes, the outer diameter of top seal board is less than the inner diameter of sinking tube, and the outer ring sets up the limit arm, the utility model discloses, can realize the function of hole bottom slurry sampling function fast, and, simple operation, low cost, construction efficiency is high, is suitable for popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation construction technology, and in particular to a device suitable for sampling cement slurry at the bottom of drilled cast-in-place pile holes. Background Technology

[0002] In engineering construction, buildings, subway stations, bridges, and other structures all involve the construction of underground pile foundations and walls, such as bored piles and diaphragm walls. These foundations and support structures often employ wet methods, using cement grout to form the walls and create trenches. To ensure the construction quality of the underground pile foundations or retaining structures, the quality of the cement grout used for wall protection is particularly crucial.

[0003] According to construction specifications and design requirements, the viscosity, specific gravity, and sand content of the cement slurry must meet certain requirements. To accurately reflect the performance indicators of the cement slurry during construction, the design and specifications stipulate that the performance indicators of the cement slurry within 500mm of the bottom of the borehole should represent the overall performance of the cement slurry. Therefore, accurately identifying the cement slurry performance within this 500mm range becomes crucial for testing the cement slurry's performance indicators.

[0004] Based on past construction experience and technical methods, the main method for collecting cement slurry within 500mm of the bottom of the borehole is to use a "sampler with a one-way valve". The sampler is sent to the bottom of the borehole by a rope, and the sampling is achieved by controlling the opening and closing of the one-way valve. The operation is relatively complicated and the structure is cumbersome.

[0005] Therefore, based on on-site construction experience, the applicant designed a self-weight sampler; its structure is simple, easy to operate, and accurate in sampling, and it can accurately extract cement slurry samples within 500mm of the bottom of the hole. Utility Model Content

[0006] The purpose of this invention is to solve the above-mentioned problems in the prior art by proposing a device for sampling cement slurry at the bottom of drilled cast-in-place piles.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A device for sampling cement slurry at the bottom of bored piles includes a submerged cylinder, wherein a top cover and a bottom cover are threadedly fitted to the upper and lower ends of the submerged cylinder, respectively.

[0009] A top sealing plate is slidably installed inside the sinking cylinder, and a pulling rope is connected to the top of the top sealing plate;

[0010] The top cover has a central opening to allow cement slurry to enter from the top and for the pull rope to pass through.

[0011] The outer diameter of the top sealing plate is smaller than the inner diameter of the submerged cylinder, and a limit arm is provided on the outer ring.

[0012] In some embodiments, the upper end of the top sealing plate and the lower end of the top cover are respectively concentrically slotted and fitted with sealing rings.

[0013] In some embodiments, the sealing rings of the top sealing plate and the top cover are concentrically offset or correspondingly arranged.

[0014] In some embodiments, a plurality of transparent windows are arranged around the submerged cylinder.

[0015] In some embodiments, a magnetic ring is provided at the lower end of the top cover;

[0016] The limiting arm is attracted by the magnetic ring; and the magnetic ring's attraction force is less than the weight of the top sealing plate; without external force, the top sealing plate falls under the action of gravity.

[0017] In some embodiments, multiple limiting arms are arranged around the perimeter, and the outer edge of the limiting arms matches the inner diameter of the submerged cylinder; the gap between the limiting arms allows cement slurry to pass through.

[0018] In some embodiments, a discharge port is provided at the center of the bottom cover;

[0019] A self-sealing cap is provided above the discharge port;

[0020] Without external force, the self-sealing cap presses against the discharge port to seal it.

[0021] In some embodiments, multiple concentric annular grooves are formed on the top of the bottom cover;

[0022] An airbag is embedded in the annular groove; and the airbag protrudes upward when not pressed down by the self-sealing cap.

[0023] In some embodiments, the self-sealing cover includes: a central cover plate and a plurality of supporting legs arranged around it; the supporting legs slide downward through the bottom cover;

[0024] In the suspended state of the submerged cylinder: the outriggers extend downwards, and the self-sealing cap presses against the bottom cover to seal the discharge port;

[0025] When the submerged cylinder is placed or in contact with the lower end: after the support leg contacts the placement surface or the contact surface, it is pushed upward; the cover is lifted, and the discharge port is gradually opened; and, when initially lifted, the discharge port does not open according to the deformation of the airbag.

[0026] In some embodiments, the inner wall of the submerged cylinder is provided with a plurality of elastic strips that apply downward pressure to the self-sealing cap.

[0027] Compared with the prior art, the present invention provides a device for sampling cement slurry at the bottom of bored piles, which has the following beneficial effects.

[0028] 1. This utility model can quickly realize the function of bottom hole slurry sampling; moreover, it is simple to operate, low in cost, and has high construction efficiency, making it suitable for widespread application.

[0029] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the basic structure of this utility model.

[0031] Figure 2 This is a schematic diagram of the structure of this utility model.

[0032] Figure 3 This is a schematic diagram of the front structure of this utility model.

[0033] Figure 4 This is a cross-sectional view of the present invention.

[0034] Figure 5 This is a cross-sectional front view of the present invention.

[0035] Figure 6 This is a diagram showing the falling state of the top sealing plate.

[0036] Figure 7 This is a partial cross-sectional view of the material discharge state of this utility model.

[0037] Figure 8 This is a cross-sectional front view of the material discharge state of this utility model.

[0038] Figure 9 This is an exploded state diagram of the present invention.

[0039] Figure 10 This is a cross-sectional view of the present invention in its exploded state.

[0040] Figure 11 This is a schematic diagram of the lower structure of the top cover.

[0041] Figure 12 This is a structural schematic diagram of the top sealing plate.

[0042] Figure 13 This is a schematic diagram of the bottom cover.

[0043] Figure 14 This is a schematic diagram of the sealing ring.

[0044] Figure 15 This is a schematic diagram showing the bottom support state of the long screw.

[0045] Figure 16 This is a cross-sectional view of the bottom support state of the long screw.

[0046] In the picture:

[0047] 1. Submerged cylinder; 11. Transparent viewing window; 2. Top cover; 21. Magnetic ring; 3. Bottom cover; 31. Discharge port; 32. Ring groove; 33. Airbag; 4. Top sealing plate; 41. Limiting arm; 5. Sealing ring; 6. Self-sealing cover; 61. Center cover plate; 62. Extension arm; 63. Support leg; 7. Elastic strip; 8. Long screw. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0049] Reference Figure 1-16 A device for sampling cement slurry at the bottom of bored piles includes a submerged cylinder 1, with a top cover 2 and a bottom cover 3 threadedly fitted to the upper and lower ends of the submerged cylinder 1, respectively; that is, the submerged cylinder is a circular tube with open top and bottom, and the detachable top cover 2 and bottom cover 3 are assembled and connected to it to form the entire sampling and holding structure.

[0050] It should be noted that the top cover 2, bottom cover 3 and submerged cylinder 1 are connected in a non-detachable manner (e.g., the top cover 2 and bottom cover 3 are plate-shaped and welded together), which can also meet the usage requirements; however, it is not conducive to cleaning, maintenance and other operations during use.

[0051] Meanwhile, a top sealing plate 4 is slidably installed inside the sinking cylinder 1, and a pulling rope is connected to the top of the top sealing plate 4; the top sealing plate 4 is moved by the pulling rope, and the entire device is moved along with it.

[0052] Preferably, the sinking cylinder 1, top cover 2, bottom cover 3 and top sealing plate 4 are all metal structures; a nut is welded to the middle of the top of the top sealing plate 4 as the connection point of the pulling rope.

[0053] Correspondingly, the top cover 2 has a central opening to allow cement slurry to enter from the top and for the pulling rope to pass through.

[0054] Preferably, the diameter of the submerged cylinder 1 is designed to be 150mm and the height to be 200mm; the inner diameter of the opening of the top cover 2 is 70mm; and the diameter of the top sealing plate 4 is 120mm (smaller than the inner diameter of the submerged cylinder 1).

[0055] Understandably, the basic principle of the bottom sampling device is that the inlet is closed during the descent; after reaching the sampling position, the inlet is opened to carry out the sampling operation.

[0056] In this scheme, a pulling rope is connected to the top sealing plate 4, and the device is lowered to the bottom of the bored pile hole using the pulling rope. During the lowering process, the top sealing plate 4, under the action of gravity, blocks the middle opening of the top cover 2, and the whole is in a sealed state. After reaching the bottom, the bottom cover 3 contacts the bottom surface, and then the pulling rope continues to be lowered. The top sealing plate 4 moves downward, opening the middle opening of the top cover 2, and cement slurry enters the sinking cylinder 1. Then, the pulling rope is pulled upward, and the top sealing plate 4 moves upward again to block the middle opening of the top cover 2. Finally, it is pulled out by the pulling rope to obtain the sample.

[0057] In some embodiments, the outer diameter of the top sealing plate 4 is smaller than the inner diameter of the submerged cylinder 1, and a limit arm 41 is provided on the outer ring.

[0058] Understandably, the outer diameter of the top sealing plate 4 must be smaller than the inner diameter of the submerged cylinder 1 to form a channel on the outside of the top sealing plate 4 for cement slurry to flow. However, this inevitably leads to the top sealing plate 4 being prone to displacement, resulting in the submerged cylinder 1 tilting and the top opening failing to close. Therefore, a limiting arm 41 was specially designed.

[0059] Specifically, such as Figure 9 , 12 As shown; multiple limiting arms 41 are arranged around the perimeter, and the outer edge of the limiting arms 41 matches the inner diameter of the submerged cylinder 1; the gap between the limiting arms 41 allows cement slurry to pass through.

[0060] Furthermore, in order to form a reliable closed shape, the upper end of the top sealing plate 4 and the lower end of the top cover 2 are respectively concentrically slotted and fitted with sealing rings 5, or respectively pasted with sealing rings 5.

[0061] The sealing rings 5 ​​of the top sealing plate 4 and the top cover 2 are concentrically offset or correspondingly arranged.

[0062] like Figure 6 As shown, the sealing rings 5 ​​of the top sealing plate 4 and the top cover 2 are correspondingly arranged, and the two sealing rings 5 ​​abut against each other to ensure the sealing effect; in another form, when the two sealing rings 5 ​​are concentrically staggered, two seals are formed, which can also ensure the sealing effect.

[0063] In some embodiments, a plurality of transparent windows 11 are arranged around the submerged cylinder 1 to directly observe the sample contents inside.

[0064] The transparent window 11 can be made of materials such as glass or high-transparency plastic; a vertical elongated hole is opened on the submerged cylinder 1, and the transparent window 11 is sealed and installed.

[0065] In some embodiments, a magnetic ring 21 is provided at the lower end of the top cover 2; the limiting arm 41 is attracted by the magnetic ring 21; and the attraction force of the magnetic ring 21 is less than the gravity of the top sealing plate 4; when there is no external force, the top sealing plate 4 falls under the action of gravity.

[0066] It is understandable that during the descent process, when the submerged cylinder 1 encounters certain resistance (such as being blocked by the hole wall), the top opening may become open. In order to better maintain the sealing effect before reaching the bottom, a magnetic ring 21 is added to provide a certain attraction force so that the top sealing plate 4 remains stable. Moreover, after reaching the bottom, it can cooperate with the gravity of the top sealing plate 4 to make the top sealing plate 4 fall without affecting the normal sampling operation.

[0067] In some embodiments, a discharge port 31 is provided at the center of the bottom cover 3; at the same time, a self-sealing cover 6 is provided above the discharge port 31; and, when not subjected to external force, the self-sealing cover 6 presses against the discharge port 31 to seal it.

[0068] like Figure 4 , 5 As shown in Figures 10 and 13; the bottom is in a closed state during the lowering or raising process.

[0069] In some embodiments, multiple concentric annular grooves 32 are formed on the top of the bottom cover 3; an airbag 33 is embedded in the annular grooves 32; and the airbag 33 protrudes upward on the surface of the bottom cover 3 when not pressed down by the self-sealing cover 6.

[0070] Correspondingly, the self-sealing cover 6 includes: a central cover plate 61, and a plurality of supporting legs 63 arranged around it; the supporting legs 63 slide downward through the bottom cover 3.

[0071] In the suspended state of submerged cylinder 1:

[0072] The support leg 63 extends downwards, and the self-sealing cover 6 presses against the bottom cover 3 to seal the discharge port 31.

[0073] Submerged cylinder 1 is in a position where it is placed or in contact with the lower end:

[0074] After the outrigger 63 contacts the placement surface or the abutment surface, it is pushed upward;

[0075] As the cover 6 is lifted, the discharge port 31 is gradually opened;

[0076] Furthermore, during the initial lifting, the discharge port 31 does not open due to the deformation of the air bladder 33.

[0077] Therefore, when the support leg 63 is accidentally triggered, the discharge port 31 will not open immediately.

[0078] Additionally, the discharge port 31 at the bottom generally needs to be designed to be smaller; in order to better match the force triggering at the bottom (the support leg 63 has a larger coverage area, making it easier to be triggered and more reliable), the area of ​​the central cover plate 61 can be designed to be larger, and the support leg 63 can be set closer to the outer edge; or, multiple extension arms 62 can be arranged around the outside of the central cover plate 61 to expand the outer edge size of the self-sealing cover 6; correspondingly, the support leg 63 is connected to the outer end of the extension arm 62.

[0079] Understandably, the size of the central cover plate 61 is larger than the outer diameter of the largest ring airbag 33, and it forms a multi-ring seal with the bottom cover 3; the inner side of the extension arm 62 is fixedly connected to the central cover plate 61, and the outer side extends with the support leg 63; the support leg 63 slides vertically through to the lower end of the bottom cover 3.

[0080] It should be noted that the sealing effect of the outrigger 63 needs to be maintained to a certain extent (the sealing requirement does not need to be particularly high); without the extension arm 62, the outrigger 63 is directly fixed to the lower end of the central cover plate 61; and the connection position of the outrigger 63 is located in the inner ring side area of ​​the airbag 33; in this way, the sealing effect can be achieved by the airbag 33.

[0081] With the extension arm 62 installed, the corresponding enclosure design needs some modifications; for example... Figure 14 In the middle, a sealing ring is fixedly fitted on the support leg 63 near the top; alternatively, a groove can be made on the bottom cover 3 to correspond to the sealing ring for better effect.

[0082] Furthermore, the lower ends of all outriggers 63 are fixed to a ring, thereby enhancing the stability and balance during the lifting process.

[0083] It should be noted that in the above method, the self-sealing cover 6 relies on gravity to seal the discharge port 31, which may have uncontrollable factors; therefore, a corresponding force application device was designed to achieve sealing more reliably.

[0084] Specifically, the inner wall of the sinking cylinder 1 is surrounded by multiple elastic strips 7 that apply downward pressure to the self-sealing cover 6, so that the discharge port 31 is sealed when there is no other external force.

[0085] It should be noted that without the extension arm 62, the elastic strip 7 presses directly on the center cover plate 61; with the extension arm 62, the elastic strip 7 can press on either the center cover plate 61 or the extension arm 62.

[0086] like Figure 4 , 5 As shown, when the lower end of the support leg 63 is not subjected to external force, the elastic strip 7 will press down the self-sealing cover 6 to seal the discharge port 31; as Figure 6 , 7As shown in Figure 8, when the lower end of the support leg 63 is subjected to an external force and moves upward, the elastic strip 7 deforms, the self-sealing cover 6 is lifted, and the discharge port 31 is opened.

[0087] It should be noted that the self-sealing cover 6 is used for sampling and discharge. During sampling, after falling to the bottom, the self-sealing cover 6 is lifted up, opening the discharge port 31, and the cement slurry enters the sinking cylinder 1. During the lifting process, the self-sealing cover 6 is pressed down, closing the discharge port 31.

[0088] After the submerged cylinder 1 is lifted out, it can simply be placed inside a suitable container, with the support legs 63 resting against the bottom of the container. Under gravity, the self-sealing cap 6 will rise to open the discharge port 31, allowing the sample to be discharged. This is simple and convenient. Alternatively, after lifting the submerged cylinder 1 out, it can be placed above a suitable container, and the self-sealing cap 6 can be manually pushed to open the discharge port 31, allowing the sample to be discharged.

[0089] However, a problem arises: if the sampled sample container 1 needs to be stored for a period of time, the design of the self-sealing cap 6 will affect its normal placement; therefore, an adjustment structure has been added.

[0090] like Figures 2-10 As shown, multiple long screws 8 are threadedly assembled on the outer ring side of the bottom cover 3.

[0091] like Figure 15 , 16 As shown, by adjusting the downward distance of the long screw 8, a support lower than the support leg 63 is formed; thus, the whole unit can be placed.

[0092] Correspondingly, when it is necessary to discharge cement slurry for sampling, or to lower it to the bottom of the drilled pile hole for sampling, the long screw 8 is adjusted upward so that the support leg 63 can be lifted and the discharge port 31 is opened.

[0093] Preferably, multiple threaded cylinders are fixedly connected to the outer ring side of the bottom cover 3, and a long screw 8 is assembled with them.

[0094] Furthermore, multiple guide cylinders are fixedly connected to the outer ring side of the top cover 2; the long screw 8 passes through the guides and threaded cylinders from top to bottom for assembly; at this time, the top of the long screw 8 is located at the top of the whole, which makes it easier to operate. Moreover, the long screw 8 can also be used as a counterweight.

[0095] This utility model provides a bottom hole cement slurry sampling device based on the principle of self-weight. It relies on its own weight to achieve the sealing and closing function of the opening, thereby controlling the sampling device to achieve the function of bottom hole sampling. It is simple and reliable.

[0096] In this invention, when the sampling device is suspended by a traction rope, the sealing rings 5 ​​on the lower surface of the top cover 2 and the upper surface of the top sealing plate 4 are tightly sealed under the weight of its components, thus achieving top closure. When lowered from the orifice, since its density is much greater than that of cement slurry, it falls to the bottom of the orifice by its own weight. After reaching the bottom of the orifice, the traction rope is lowered to an even greater depth. Under its own weight, the top sealing plate 4 inside the cylinder disengages from the top of the cylinder, opening the channel at the top to collect cement slurry samples within 500mm of the bottom of the orifice.

[0097] In this invention, all accessories can be manufactured according to standardized production processes and applied on the construction site, enabling rapid sampling of slurry at the bottom of the borehole; moreover, it is simple to operate, low in cost, and highly efficient in construction; at the same time, the device is sturdy and durable, lightweight, reusable, resource-saving, and environmentally friendly, making it suitable for widespread application.

[0098] In this invention, the detachable top cover 2 and bottom cover 3 facilitate cleaning and maintenance during use; the top sealing plate 4, in conjunction with the limiting arm 41, forms a channel for cement slurry flow and improves stability and reliability; a sealing ring 5 is provided to strengthen the top sealing; a transparent window 11 is provided to directly observe the sample filling situation inside; a magnetic ring 21 is provided to provide a certain attraction to keep the top sealing plate 4 stable; a discharge port 31 is opened at the lower end for convenient and rapid discharge; the airbag 33 protrudes upwards and will not immediately open the discharge port 31 when accidentally touched; the long screw 8 adjusts the bottom support and can also be used as a counterweight.

[0099] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0100] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0101] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for sampling cement slurry at the bottom of bored piles, comprising a submerged cylinder (1), characterized in that, The upper and lower ends of the submerged cylinder (1) are respectively threaded with a top cover (2) and a bottom cover (3). A top sealing plate (4) is slidably disposed inside the sinking cylinder (1), and a pulling rope is connected to the top of the top sealing plate (4); The top cover (2) has a central opening for cement slurry to enter from the top and for the pull rope to pass through; The outer diameter of the top sealing plate (4) is smaller than the inner diameter of the submerged cylinder (1), and a limit arm (41) is provided on the outer ring.

2. The device for sampling cement slurry at the bottom of drilled cast-in-place piles according to claim 1, characterized in that, The upper end of the top sealing plate (4) and the lower end of the top cover (2) are respectively concentrically slotted and fitted with sealing rings (5).

3. The device for sampling cement slurry at the bottom of drilled cast-in-place piles according to claim 2, characterized in that, The sealing ring (5) of the top sealing plate (4) and the top cover (2) are concentrically offset or correspondingly arranged.

4. The device for sampling cement slurry at the bottom of drilled cast-in-place piles according to claim 1, characterized in that, The submerged cylinder (1) is surrounded by multiple transparent windows (11).

5. The device for sampling cement slurry at the bottom of bored piles according to claim 1, characterized in that, A magnetic ring (21) is provided at the lower end of the top cover (2). The limiting arm (41) is attracted by the magnetic ring (21); and the attraction force of the magnetic ring (21) is less than the gravity of the top sealing plate (4); without external force, the top sealing plate (4) falls under the action of gravity.

6. The device for sampling cement slurry at the bottom of drilled cast-in-place piles according to claim 1, characterized in that, Multiple limiting arms (41) are arranged around the perimeter, and the outer edge of the limiting arms (41) matches the inner diameter of the submerged cylinder (1); the gap between the limiting arms (41) allows cement slurry to pass through.

7. The device for sampling cement slurry at the bottom of bored piles according to claim 1, characterized in that, The bottom cover (3) has a discharge port (31) at its center. A self-sealing cap (6) is provided above the discharge port (31); Without the action of external force, the self-sealing cap (6) presses against the discharge port (31) to seal it.

8. The apparatus for sampling cement slurry at the bottom of bored piles according to claim 7, characterized in that, Multiple annular grooves (32) are concentrically formed above the bottom cover (3); An airbag (33) is embedded in the annular groove (32); and the airbag (33) protrudes upward when not pressed down by the self-sealing cap (6).

9. The apparatus for sampling cement slurry at the bottom of bored piles according to claim 8, characterized in that, The self-sealing cover (6) includes: a central cover plate (61) and a plurality of supporting legs (63) arranged around it; the supporting legs (63) slide downward through the bottom cover (3); In the suspended state of the submerged cylinder (1): the support leg (63) extends downward and the self-sealing cover (6) presses on the bottom cover (3) to seal the discharge port (31). When the submerged cylinder (1) is in a position or in a contacting state at its lower end: after the support leg (63) contacts the placement surface or the contact surface, it is pushed upward; the cover (6) is lifted up, and the discharge port (31) is gradually opened. Furthermore, during the initial lifting, the discharge port (31) does not open due to the deformation of the air bladder (33).

10. The apparatus for sampling cement slurry at the bottom of bored piles according to claim 7, characterized in that, The inner wall of the submerged cylinder (1) is provided with a plurality of elastic strips (7) that apply downward pressure to the self-sealing cap (6).

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