Leaking stoppage device for bored pile construction and bored pile construction method

Abstract

The invention discloses a leaking stoppage device for bored pile construction and a bored pile construction method, and relates to the technical field of bored piles.The leaking stoppage device for bored pile construction comprises a top pile casing located at the position of a pile hole and a leaking stoppage head hoisted at the position of the pile hole, and a steel rope is arranged on the leaking stoppage head; the leaking stoppage head penetrates through the top pile casing through the steel rope and sinks to the leaking point position in the pile hole; the plugging head comprises a fixed sleeve and a movable sleeve, the movable sleeve is fixedly connected with the bottom of the steel rope, the fixed sleeve is provided with a fixing piece used for fixing the sunken fixed sleeve to the inner wall of a pile hole, an external expansion rod capable of being expanded and bent is arranged between the fixed sleeve and the movable sleeve, and the external expansion rod is arranged around the central axis of the fixed sleeve at equal angles. And a water swelling strip is arranged on the outer surface of the external expansion rod. According to the invention, a corresponding shape can be expanded according to the change of the water leakage position, so that the water leakage gap can be better fit and filled.

Description

Technical Field

[0001] The invention relates to the technical field of bored piles, and in particular to a plugging device for bored pile construction and a bored pile construction method. Background Art

[0002] Pile foundation is the foundation of the bridge. Most of the existing pile foundations are constructed using the mud wall bored pile construction process. During the pile foundation construction process, due to the presence of karst caves or poor site adjustment, it is easy to cause slurry leakage during the drilling process, which in turn causes problems such as drilling construction stagnation and hole collapse. In order to solve the slurry leakage problem, loess, stone flakes, cement and other fillers are generally backfilled into the drilled holes to plug the leakage.

[0003] For related technologies, reference may be made to the Chinese patent with the authorization announcement number CN114319337B, which discloses a plugging device for bored pile construction and a bored pile construction method. A plugging device for bored pile construction includes a top casing and at least one level of plugging casing, all of which are arranged vertically in sequence below the top casing, the outer diameter of the plugging casing located below is smaller than the inner diameter of the plugging casing located above, the outer diameter of the topmost plugging casing is smaller than the inner diameter of the top casing, one end of the plugging casing is provided with a water-expanding structure, the water-expanding structure is used to plug the gap between the plugging casing and the inner wall of the top casing or the gap between the inner wall of the adjacent plugging casing, which can better plug the leaking part of the drilling process, and has a high plugging success rate, resulting in less waste of resources, continuous construction, faster progress of bridge construction, and lower construction costs.

[0004] However, the above scheme still has certain limitations. For example, the cross-section of the plugging casing is designed to be a fixed shape, which makes it difficult to adapt to pile holes of different cross-section sizes, which may lead to poor sealing effect, thereby affecting the overall plugging effect and construction quality. Summary of the invention

[0005] The present application provides a plugging device for bored pile construction and a bored pile construction method, which has the function of expanding a corresponding shape according to changes in the leakage position, thereby better fitting and filling the gaps that cause the leakage.

[0006] The present application provides a plugging device for bored pile construction and a bored pile construction method, which adopts the following technical solutions: A plugging device for bored pile construction and a bored pile construction method, wherein the plugging device for bored pile construction comprises a top casing located at the position of the pile hole and a plugging head hoisted at the leaking position of the pile hole, the plugging head is provided with a steel rope, the plugging head is passed through the top casing by the steel rope, and is sunk to the leaking position in the pile hole; the plugging head comprises a fixed sleeve and a movable sleeve, the movable sleeve is fixedly connected to the bottom of the steel rope, and the fixed sleeve is provided with a fixed sleeve for fixing the sunken fixed sleeve on the inner wall of the pile hole A fixing part on the outer sleeve, an outward expansion rod that can be expanded and bent outward is arranged between the fixed sleeve and the movable sleeve, the connection is arranged at equal angles around the central axis of the fixed sleeve, and a water-swellable waterstop strip is arranged on the outer surface of the outward expansion rod. After the fixed sleeve is fixed, the movable sleeve is moved toward the fixed sleeve by winding the steel rope. At this time, the outward expansion rod between the movable sleeve and the fixed sleeve is folded. At this time, the outer part of the outward expansion rod expands until the water-swellable waterstop strip on the outer side of the outward expansion rod contacts the leakage point on the inner wall of the pile hole.

[0007] By adopting the above technical scheme, the leak-proof device consists of a fixed sleeve, a movable sleeve and a bendable expansion rod; the fixed sleeve is firmly installed on the inner wall of the pile hole through a fixing part, and the movable sleeve is connected to the steel rope and can be moved by winding the steel rope; the expansion rod provides a connection and support between the fixed sleeve and the movable sleeve, and when the movable sleeve moves toward the fixed sleeve, the expansion rod will fold and produce a moderate deformation with the help of the flexibility of the material; at the same time, the outer surface of the expansion rod is equipped with a water-swelling waterstop strip, and when the expansion rod contacts the leaking point on the inner wall of the pile hole, the waterstop strip will expand due to the action of moisture, thereby forming an effective seal and achieving the purpose of leak-proofing; the water-swelling waterstop strip can be used to quickly and efficiently seal the leaking point, thereby significantly improving the leak-proofing efficiency; in addition, the bendable expansion rod is designed to enable it to expand into a corresponding shape according to changes in the leaking position, so as to better fit and fill the gap that causes the leak.

[0008] Preferably, a reinforcement sleeve is provided at the top inner ring opening of the top protective sleeve, and the top of the reinforcement sleeve is turned outward to form a clamping portion at the top of the top protective sleeve.

[0009] By adopting the above technical solution, the clamping portion formed on the reinforcement sleeve can increase the connection strength with the ground and prevent the casing from sliding or shifting due to mechanical effects during construction and use.

[0010] Preferably, a plurality of guide assemblies for guiding the steel rope are provided on the top of the reinforcement sleeve, and a plurality of guide assemblies are arranged at equal angles around the central axis of the reinforcement sleeve. The guide assemblies include a mounting frame, and a first guide wheel and a second guide wheel are provided on the mounting frame. The steel rope passes through the first guide wheel and the second guide wheel in an alternating manner up and down.

[0011] By adopting the above technical solution, the guide assembly forms a guide system through the first guide wheel and the second guide wheel arranged on the reinforcement sleeve, which helps the steel rope move along a specific path, thereby ensuring stability and safety during the lifting process.

[0012] Preferably, a first limiting sleeve matching the number of steel ropes is provided on the inner wall of the reinforcing sleeve, and a through hole for the steel ropes to pass through is provided inside the first limiting sleeve.

[0013] By adopting the above technical solution, the design of the through hole allows the steel rope to pass smoothly, while forming effective support with the side wall of the limiting sleeve; the position of the through hole is precisely arranged to ensure the accurate positioning of the steel rope, thereby preventing misalignment or entanglement during operation.

[0014] Preferably, the fixing member includes an oblique insertion hole arranged inside the fixing sleeve, the oblique insertion hole is arranged to be inclined downward toward the inner wall of the pile hole, and a plurality of the oblique insertion holes are distributed at equal angles around the central axis of the fixing sleeve, and an oblique insertion rod is arranged inside each oblique insertion hole of the fixing sleeve, and the oblique insertion rod slides along the inside of the oblique insertion hole by hitting the top of the oblique insertion rod until it is obliquely inserted into the inner wall of the pile hole.

[0015] By adopting the above technical solution, the top of the oblique insertion rod is hit, so that the oblique insertion rod slides along the inside of the oblique insertion hole until it is inserted into the inner wall of the pile hole at an angle downward, which helps to enhance the fixing effect.

[0016] Preferably, the outward expansion rod is made of thermoplastic polyurethane, and includes a first outward expansion portion, a straight portion, and a second outward expansion portion. The first outward expansion portion, the straight portion, and the second outward expansion portion of the outward expansion rod form a V-shaped cross-section structure, and a first notch is formed between the first outward expansion portion of the outward expansion rod and the straight portion of the outward expansion rod, and a second notch is formed between the straight portion of the outward expansion rod and the second outward expansion portion of the outward expansion rod.

[0017] By adopting the above technical solution, the V-shaped cross-section design of the expansion rod and the setting of the first notch and the second notch enable the joints between the first expansion part and the straight part, and between the second expansion part and the straight part to be flexibly deformed when subjected to longitudinal extrusion; when external force is applied, the deformation of these joints enables the expansion rod to unfold at different angles, thereby realizing the function of adapting to pile holes of different diameters.

[0018] Preferably, raised blocks are evenly distributed on the first outwardly expanded portion and the second outwardly expanded portion of the water-swellable waterstop strip, and the cross-section of the raised blocks is a semicircular structure.

[0019] By adopting the above technical solution, the semicircular raised blocks can effectively increase the contact area between the water stop strip and the soil or surrounding structures, thereby improving the sealing effect.

[0020] Preferably, the water-swellable waterstop strip is located on the straight portion of the outward expansion rod.

[0021] By adopting the above technical solution, when the expansion rod expands outward, the straight portion contacts the leaking part, and the straight portion forms a transition slope at the first expansion part and the second expansion part of the expansion rod, which is used to effectively play a role in plugging the leak.

[0022] Preferably, a water-swellable water-stop ring is provided on the bottom of the inner ring of the fixed sleeve and on the top of the inner ring of the movable sleeve.

[0023] By adopting the above technical solution, the water-swellable waterstop ring of the fixed sleeve and the water-swellable waterstop ring of the movable sleeve are designed so that they can work together to form an effective sealing system; when the movable sleeve is in motion, the water-swellable waterstop ring maintains the seal by expansion to prevent water from leaking in the system.

[0024] Preferably, the bored pile construction method of the plugging device for bored pile construction comprises the following construction steps: S1: Conduct a detailed survey of the construction site, including geological conditions and groundwater levels; prepare drilling machines, concrete mixers, and leak-proofing devices; and then set up safety precautions to ensure the safety of workers; S2: Lay out the pile positions according to the design drawings to ensure the accuracy of the drilling positions; then use a drilling machine to perform drilling operations according to the designed depth; S3: Check the depth and diameter of the borehole, install the top casing at the top opening of the pile hole, and install the reinforcement sleeve at the top inner ring opening of the top casing to ensure the construction quality; S4: When the drilling construction encounters leakage, the plugging head is lowered to the leakage point by a steel rope, and the sunken fixing sleeve is fixed on the inner wall of the pile hole by a fixing piece; S5: After the fixed sleeve is fixed, the steel rope is wound to move the movable sleeve toward the fixed sleeve. At this time, the outer expansion rod between the movable sleeve and the fixed sleeve is folded. At this time, the outer part of the outer expansion rod expands until the water-swelling water stop strip on the outer part of the outer expansion rod contacts the leaking point on the inner wall of the pile hole, and then the drilling construction continues; S6: After confirming that the plugging measures are effective, proceed with concrete pouring operations; maintain the uniformity and fluidity of the concrete to avoid voids.

[0025] By adopting the above technical solution, In summary, this application has the following beneficial effects: 1. The plugging device for bored pile construction; it consists of a fixed sleeve, a movable sleeve and a bendable expansion rod; the fixed sleeve is firmly mounted on the inner wall of the pile hole through a fixing part, while the movable sleeve is connected to a steel rope and can be moved by winding the steel rope; the expansion rod provides a connection and support between the fixed sleeve and the movable sleeve, and when the movable sleeve moves toward the fixed sleeve, the expansion rod will fold and produce a moderate deformation with the help of the flexibility of the material; at the same time, the outer surface of the expansion rod is equipped with a water-swelling water-stop strip, and when the expansion rod contacts the leaking point on the inner wall of the pile hole, the water-stop strip will expand due to the action of moisture, thereby forming an effective seal and achieving the purpose of plugging the leak; the water-swelling water-stop strip can be used to quickly and efficiently plug the leaking point, thereby significantly improving the plugging efficiency; in addition, the bendable expansion rod is designed to enable it to expand into a corresponding shape according to changes in the leaking position, so as to better fit and fill the gap that causes the leak.

[0026] 2. The bored pile construction method of the plugging device for bored pile construction, firstly, through detailed on-site investigation, potential geological problems can be identified before construction to ensure the safety and effectiveness of construction; secondly, the use of precise layout and drilling technology can improve the accuracy of pile positions and ensure the quality of construction; in addition, when encountering leakage, the rapid response of the plugging equipment can solve the problem in time to prevent leakage from affecting subsequent construction; finally, the concrete pouring stage emphasizes uniformity and fluidity, which helps to improve the overall stability and durability of the project, thereby ensuring the durability and reliability of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the overall structure of the plugging device for bored pile construction in this embodiment; Figure 2 is an overall cross-sectional view of the top casing in this embodiment; Figure 3 Schematic diagram of the internal structure of the outer expansion rod in this embodiment; Figure 4 2 is a schematic diagram of the overall structure of the plugging head in the embodiment of the present invention; Explanation of the reference numerals: 1. Top casing; 2. Leakage plugging head; 201. Fixed sleeve; 202. Movable sleeve; 203. Fixing piece; 204. Water-swelling waterstop strip; 205. Outward expansion rod; 20501. First outward expansion portion; 20502. Straight portion; 20503. Second outward expansion portion; 20504. First notch; 20505. Second notch; 206. Raised block; 3. Steel rope; 4. Reinforcement sleeve; 5. Clamping portion; 6. Guide assembly; 601. Mounting frame; 602. First guide wheel; 603. Second guide wheel; 7. Water-swelling waterstop ring. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content. Example

[0029] The present invention discloses a plugging device for bored pile construction and a bored pile construction method. Figure 1 As shown, the plugging device for bored pile construction includes a top casing 1 located at the position of the pile hole and a plugging head 2 hoisted at the leaking position of the pile hole, wherein the plugging head 2 is provided with a steel rope 3, through which the plugging head 2 passes through the top casing 1 and sinks to the leaking position in the pile hole, and through the steel rope 3, the plugging head 2 can be lowered from the casing at the top of the pile hole until it reaches the leaking position; this hoisting system can flexibly adjust the depth of the plugging head 2 to ensure that it accurately reaches the leaking point.

[0030] like Figure 1 As shown, a reinforcement sleeve 4 is provided at the top inner ring opening of the top casing 1. The provision of the reinforcement sleeve 4 enhances the strength and rigidity of the top casing 1, reduces deformation or damage caused by external pressure (such as soil pressure, water pressure, etc.), and thus improves the durability of the structure; the top of the reinforcement sleeve 4 is turned outward and forms a clamping portion 5 at the top of the top casing 1, and the formed clamping portion 5 can increase the connection strength with the ground, and prevent the casing from sliding or shifting due to mechanical action during construction and use; and in addition to increasing stability, the clamping portion 5 can also improve the waterproof and sealing properties, and prevent water and mud from leaking from the joints of the casing.

[0031] like Figure 1 As shown, it ensures that the top casing 1 remains stable during long-term use, reduces the risk of settlement and deformation of beams or pile foundations, and improves the safety of the overall structure; the outward-turned clamping portion 5 design makes it easier to fix the casing during construction, simplifies the operating steps, and improves construction efficiency.

[0032] like Figure 1 and Figure 2As shown, a plurality of guide assemblies 6 for guiding the steel rope 3 are fixedly installed on the top of the reinforcement sleeve 4, and four guide assemblies 6 are arranged at equal angles around the central axis of the reinforcement sleeve 4. Specifically, the guide assembly 6 includes a mounting frame 601, and a first guide wheel 602 and a second guide wheel 603 are arranged on the mounting frame 601. The steel rope 3 passes through the first guide wheel 602 and the second guide wheel 603 alternately up and down. The guide assembly 6 forms a guide system by the first guide wheel 602 and the second guide wheel 603 arranged on the reinforcement sleeve 4, which helps the steel rope 3 move along a specific path, thereby ensuring stability and safety during the lifting process; the steel rope 3 passes through the first and second guide wheels 603 alternately up and down, which can achieve a reasonable configuration of the steel rope 3 in the vertical direction, making the lifting of heavy objects more stable and avoiding friction, wear or breakage of the steel rope 3 due to uneven force; the four guide wheels of the guide assembly 6 are evenly arranged around the central axis of the reinforcement sleeve 4, which can provide balanced support during the lifting process, disperse the lifting weight, and make the entire system more stable.

[0033] like Figure 1 and Figure 2 As shown, a first limiting sleeve matching the number of steel ropes 3 is fixedly mounted on the inner wall of the reinforcing sleeve 4, and a through hole is provided inside the first limiting sleeve for the steel ropes 3 to pass through; the design of the through hole allows the steel ropes 3 to pass through smoothly while forming a certain support with the side wall of the limiting sleeve; the setting of the position of the through hole can accurately locate the position of the steel rope 3 to prevent it from being misplaced or entangled during operation.

[0034] like Figure 3 and Figure 4As shown, the plugging head 2 includes a fixed sleeve 201 and a movable sleeve 202, the movable sleeve 202 is fixedly connected to the bottom of the steel rope 3, the fixed sleeve 201 is provided with a fixing piece 203, the fixed sleeve 201 is fixed to the inner wall of the pile hole by the fixing piece 203, an outward expansion rod 205 that can be expanded and bent outward is provided between the fixed sleeve 201 and the movable sleeve 202, the connection is arranged at equal angles around the central axis of the fixed sleeve 201, the outer surface of the outward expansion rod 205 is provided with a water-swelling water stop strip 204, after the fixed sleeve 201 is fixed, the steel rope 3 is wound up, so that the movable sleeve 202 moves toward the fixed sleeve 201, at this time the outward expansion rod 205 between the movable sleeve 202 and the fixed sleeve 201 is folded, and the outer expansion rod 205 is expanded outside. , until the water-swelling water-stopping strip 204 on the outside of the outer expansion rod 205 contacts the leaking point on the inner wall of the pile hole; the plugging head 2 is composed of a fixed sleeve 201, a movable sleeve 202 and a bent outer expansion rod 205; the fixed sleeve 201 is firmly fixed to the inner wall of the pile hole by a fixing member 203, and the movable sleeve 202 is connected to the steel rope 3 and can be moved by winding the steel rope 3; the outer expansion rod 205 plays a role of connection and support between the fixed and movable sleeves 202, and when the movable sleeve 202 moves toward the fixed sleeve 201, the outer expansion rod 205 will fold, and the flexibility of the material will be used to produce a moderate deformation; the outer surface of the outer expansion rod 205 is provided with a water-swelling water-stopping strip, and when the outer expansion rod 205 contacts the leaking point on the inner wall of the pile hole, the water-stopping strip will swell due to moisture, thereby forming a seal to achieve the effect of plugging the leak.

[0035] like Figure 3 and Figure 4 As shown, the water stop strip that swells when in contact with water can quickly and effectively stop the leak, thereby improving the efficiency of plugging leaks; the bendable outward expansion rod 205 can expand into a corresponding shape according to the different locations of the leak, so that it can better fit and fill the gaps that cause the leak.

[0036] like Figure 3 and Figure 4 As shown, specifically, the fixing member 203 includes an oblique insertion hole arranged inside the fixing sleeve 201, the oblique insertion hole is arranged to be inclined downward toward the inner wall of the pile hole, and a number of the oblique insertion holes are distributed at equal angles around the central axis of the fixing sleeve 201, and an oblique insertion rod is arranged inside each oblique insertion hole of the fixing sleeve 201, and the oblique insertion rod slides along the inside of the oblique insertion hole by hitting the top of the oblique insertion rod until it is inserted into the inner wall of the pile hole at an angle downward; at this time, the shape and surface of the oblique insertion rod increase the contact area with the inner wall of the pile hole, which helps to enhance the fixing effect; once the oblique insertion rod is successfully inserted into the inner wall of the pile hole, the inclined surface of the oblique insertion rod can generate friction with the pile hole, ensuring that the fixing sleeve 201 is stable and motionless in the pile hole.

[0037] like Figure 3 and Figure 4 As shown, the material of the outward expansion rod 205 is thermoplastic polyurethane, and the outward expansion rod 205 includes a first outward expansion portion 20501, a straight portion 20502, and a second outward expansion portion 20503. The first outward expansion portion 20501, the straight portion 20502, and the second outward expansion portion 20503 of the outward expansion rod 205 form a V-shaped cross-section structure, and a first notch 20504 is formed between the first outward expansion portion 20501 of the outward expansion rod 205 and the straight portion 20502 of the outward expansion rod 205. A second notch 20505 is formed between the straight portion 20502 of the V-shaped expansion rod 205 and the second expansion portion 20503 of the expansion rod 205. When the expansion rod 205 is squeezed in the longitudinal direction, the first expansion portion 20501 and the straight portion 20502 will be deformed at the first notch 20504, and the second expansion portion 20503 and the straight portion 20502 will be deformed at the second notch 20505, thereby realizing the angle change of the V-shaped expansion rod 205 to adapt to pile holes of different apertures.

[0038] like Figure 3 As shown, the V-shaped cross-section design of the expansion rod 205 and the arrangement of the first notch 20504 and the second notch 20505 enable the joints between the first expansion portion 20501 and the straight portion 20502, and between the second expansion portion 20503 and the straight portion 20502 to be flexibly deformed when subjected to longitudinal extrusion; when external force is applied, the deformation of these joints enables the expansion rod 205 to expand at different angles, thereby achieving the function of adapting to pile holes of different hole diameters.

[0039] like Figure 3 As shown, during the longitudinal extrusion process, due to the unique shape of the V-shaped expansion rod 205, the applied pressure is not only transmitted to the straight portion 20502, but also evenly distributed to the first expansion portion 20501 and the second expansion portion 20503; thereby effectively reducing the risk of local stress concentration and avoiding premature fatigue or rupture of the material.

[0040] like Figure 3 As shown, the water-swellable waterstop strip 204 is located on the straight portion 20502 of the outward expansion rod 205. When the outward expansion rod 205 expands outward, the straight portion 20502 contacts the leaking part, and the straight portion 20502 forms a transition slope at the first outward expansion portion 20501 and the second outward expansion portion 20503 of the outward expansion rod 205, which is used to effectively play a role in plugging the leak.

[0041] like Figure 3As shown, the first outward expansion portion 20501 and the second outward expansion portion 20503 of the water-swellable waterstop strip 204 are evenly distributed with raised blocks 206, and the cross-section of the raised blocks 206 is a semicircular structure. The semicircular raised blocks 206 can effectively increase the contact area between the waterstop strip and the soil or surrounding structures, thereby improving the sealing effect; the larger contact area helps the waterstop strip to provide better support and compression when the water expands; the semicircular design helps to guide water flow and disperse water pressure, prevent water from concentrating at a certain point, and reduce potential damage or leakage.

[0042] like Figure 3 As shown, a water-swellable waterstop ring 7 is provided on the inner ring of the fixed sleeve 201 near its bottom and the inner ring of the movable sleeve 202 near its top. The water-swellable waterstop ring 7 and the water-swellable waterstop strip 204 are made of the same material. The water-swellable waterstop ring 7 will expand when it comes into contact with water to form a tight seal; and the waterstop ring of the inner ring of the fixed sleeve 201 and the water-swellable waterstop ring 7 of the movable sleeve 202 are made of the same material, which can ensure that their expansion properties are consistent under the same humidity and temperature conditions, avoiding differences in sealing effects caused by different materials; the design of the water-swellable waterstop ring 7 of the fixed sleeve 201 and the water-swellable waterstop ring 7 of the movable sleeve 202 enables them to work together to form an effective sealing system; when the movable sleeve 202 is in motion, the water-swellable waterstop ring 7 maintains a seal by expansion to prevent moisture from leaking into the system.

[0043] The bored pile construction method of the plugging device for bored pile construction comprises the following construction steps: S1: Conduct a detailed survey of the construction site, including geological conditions, groundwater level, etc.; prepare drilling machines, concrete mixers and plugging devices; then set up safety protection measures to ensure the safety of workers; S2: Lay out the pile positions according to the design drawings to ensure the accuracy of the drilling positions; then use a drilling machine to perform drilling operations according to the designed depth; S3: Check the depth and diameter of the borehole, install the top casing 1 at the top opening of the pile hole, and install the reinforcement sleeve 4 at the top inner ring opening of the top casing 1 to ensure the construction quality; S4: When the drilling construction encounters leakage, the plugging head 2 is lowered to the leakage point by the steel rope 3, and the sunken fixing sleeve 201 is fixed on the inner wall of the pile hole by the fixing member 203; S5: After the fixed sleeve 201 is fixed, the steel rope 3 is wound to make the movable sleeve 202 move toward the fixed sleeve 201. At this time, the outer expansion rod 205 between the movable sleeve 202 and the fixed sleeve 201 is folded. At this time, the outer part of the outer expansion rod 205 expands until the water-swelling water stop strip 204 on the outer part of the outer expansion rod 205 contacts the water leakage point on the inner wall of the pile hole, and then the drilling construction continues; S6: After confirming that the plugging measures are effective, proceed with concrete pouring operations; maintain the uniformity and fluidity of the concrete to avoid voids.

[0044] Working principle: When using it, the construction workers first conduct a comprehensive survey of the construction site to learn about the geological conditions and groundwater level in detail. Then, they prepare the drilling machine, concrete mixer and plugging device, and set up safety protection measures to ensure the safety of the workers. And accurately lay out the lines according to the design drawings to ensure the accuracy of the drilling position. Use the drilling machine to drill and complete the drilling operation according to the designed depth.

[0045] Check the depth and diameter of the borehole to ensure that it meets the design requirements. Install the top casing 1 at the top opening of the pile hole, and install the reinforcement sleeve 4 at the top inner ring opening of the casing to improve the construction quality. If leakage occurs during the drilling process, use the steel rope 3 to lower the plugging head 2 to the leaking point, and then use the fixing piece 203 to firmly install the sunken fixing sleeve 201 on the inner wall of the pile hole.

[0046] After the fixed sleeve 201 is stabilized, the steel rope 3 is wound to move the movable sleeve 202 toward the fixed sleeve 201. At this time, the outer expansion rod 205 between the movable sleeve 202 and the fixed sleeve 201 is folded and expanded at the same time until the expanded part of the outer expansion rod 205 contacts the water leakage point on the inner wall of the pile hole.

[0047] After ensuring that the plugging measures are effective, proceed with concrete pouring. Maintain the uniformity and fluidity of the concrete to prevent voids.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A plugging device for bored pile construction, comprising a top casing (1) located at the position of a pile hole and a plugging head (2) hoisted at the leaking position of the pile hole, characterized in that: The plugging head (2) is provided with a steel rope (3), and the plugging head (2) is passed through the top casing (1) by the steel rope (3) and sunk to the leak point in the pile hole; the plugging head (2) comprises a fixed sleeve (201) and a movable sleeve (202), the movable sleeve (202) is fixedly connected to the bottom of the steel rope (3), the fixed sleeve (201) is provided with a fixing member (203) for fixing the sunken fixed sleeve (201) on the inner wall of the pile hole, and an outward expansion rod (205) that can be expanded and bent outward is provided between the fixed sleeve (201) and the movable sleeve (202). The connection is arranged at equal angles around the central axis of the fixed sleeve (201); the outer surface of the outer expansion rod (205) is provided with a water-swellable water stop strip (204); after the fixed sleeve (201) is fixed, the steel rope (3) is rolled up so that the movable sleeve (202) moves toward the fixed sleeve (201); at this time, the outer expansion rod (205) between the movable sleeve (202) and the fixed sleeve (201) is folded; at this time, the outer portion of the outer expansion rod (205) expands until the water-swellable water stop strip (204) on the outer portion of the outer expansion rod (205) contacts a water leakage point on the inner wall of the pile hole.

2. The plugging device for bored pile construction according to claim 1, characterized in that: A reinforcement sleeve (4) is provided at the top inner ring opening of the top casing (1); the top of the reinforcement sleeve (4) is turned outward and forms a clamping portion (5) at the top of the top casing (1).

3. The plugging device for bored pile construction according to claim 2, characterized in that: A plurality of guide assemblies (6) for guiding the steel rope (3) are provided at the top of the reinforcement sleeve (4), and a plurality of the guide assemblies (6) are arranged at equal angles around the central axis of the reinforcement sleeve (4). The guide assemblies (6) include a mounting frame (601), and a first guide wheel (602) and a second guide wheel (603) are provided on the mounting frame (601). The steel rope (3) passes through the first guide wheel (602) and the second guide wheel (603) in an alternating manner up and down.

4. The plugging device for bored pile construction according to claim 3, characterized in that: The inner wall of the reinforcing sleeve (4) is provided with first limiting sleeves whose number matches the number of the steel ropes (3), and the interior of the first limiting sleeve is provided with through holes for the steel ropes (3) to pass through.

5. The plugging device for bored pile construction according to claim 1, characterized in that: The fixing member (203) comprises an oblique insertion hole arranged inside the fixing sleeve (201), the oblique insertion hole being arranged to be inclined downwardly toward the inner wall of the pile hole, and a plurality of the oblique insertion holes being distributed at equal angles around the central axis of the fixing sleeve (201), and an oblique insertion rod being arranged inside each oblique insertion hole of the fixing sleeve (201), and by striking the top of the oblique insertion rod, the oblique insertion rod slides along the inside of the oblique insertion hole until it is obliquely inserted into the inner wall of the pile hole.

6. The leak-proof device for bored pile construction according to claim 1, characterized in that: The material of the outward expansion rod (205) is thermoplastic polyurethane. The outward expansion rod (205) comprises a first outward expansion portion (20501), a straight portion (20502) and a second outward expansion portion (20503). The first outward expansion portion (20501), the straight portion (20502) and the second outward expansion portion (20503) of the outward expansion rod (205) form a V-shaped structure in cross section. A first notch (20504) is formed between the first outward expansion portion (20501) of the outward expansion rod (205) and the straight portion (20502) of the outward expansion rod (205), and a second notch (20505) is formed between the straight portion (20502) of the outward expansion rod (205) and the second outward expansion portion (20503) of the outward expansion rod (205).

7. The plugging device for bored pile construction according to claim 6, characterized in that: The first outwardly expanded portion (20501) and the second outwardly expanded portion (20503) of the water-swellable waterstop strip (204) are evenly distributed with raised blocks (206), and the cross-section of the raised blocks (206) is a semicircular structure.

8. The plugging device for bored pile construction according to claim 7, characterized in that: The water-swellable water stop strip (204) is located on the straight portion (20502) of the outer expansion rod (205).

9. The leak-proof device for bored pile construction according to claim 6, characterized in that: The inner ring of the fixed sleeve (201) close to the bottom thereof and the inner ring of the movable sleeve (202) close to the top thereof are both provided with a water-swellable water stop ring (7).

10. A bored pile construction method according to any one of claims 1 to 9, characterized in that: The construction steps include: S1: Conduct a detailed survey of the construction site, including geological conditions and groundwater levels; prepare drilling machines, concrete mixers, and leak-proofing devices; and then set up safety precautions to ensure the safety of workers; S2: Lay out the pile positions according to the design drawings to ensure the accuracy of the drilling positions; then use a drilling machine to perform drilling operations according to the designed depth; S3: Check the depth and diameter of the drilled hole, install a top casing (1) at the top opening of the pile hole, and install a reinforcement sleeve (4) at the top inner ring opening of the top casing (1) to ensure the construction quality; S4: When leakage occurs during drilling, the plugging head (2) is lowered to the leakage point by means of a steel rope (3), and the sunken fixing sleeve (201) is fixed to the inner wall of the pile hole by means of a fixing member (203); S5: After the fixed sleeve (201) is fixed, the steel rope (3) is rolled up to move the movable sleeve (202) toward the fixed sleeve (201). At this time, the outer expansion rod (205) between the movable sleeve (202) and the fixed sleeve (201) is folded. At this time, the outer portion of the outer expansion rod (205) expands until the water-expanding water stop strip (204) on the outer portion of the outer expansion rod (205) contacts the water leakage point on the inner wall of the pile hole, and then the drilling construction is continued; S6: After confirming that the plugging measures are effective, proceed with concrete pouring operations; maintain the uniformity and fluidity of the concrete to avoid voids.

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