A leaking stoppage device for bored pile construction and a bored pile construction method

Abstract

This invention discloses a leak-sealing device and a method for drilling pile construction, relating to the technical field of drilled piles. The leak-sealing device includes a top casing located at the pile hole and a leak-sealing head suspended at the leak point in the pile hole. A steel rope is attached to the leak-sealing head, which passes through the top casing and is lowered to the leak point within the pile hole. The leak-sealing head includes a fixed sleeve and a movable sleeve. The movable sleeve is fixedly connected to the bottom of the steel rope. The fixed sleeve has a fixing element for securing the lowered fixed sleeve to the inner wall of the pile hole. An outwardly expanding and bending rod is provided between the fixed sleeve and the movable sleeve. The outwardly expanding rod is angled around the central axis of the fixed sleeve, and its outer surface is provided with a water-swellable sealing strip. This invention allows the device to expand into a corresponding shape according to changes in the leak location, thereby better fitting and filling the leaking gap.

Description

Technical Field

[0001] This invention relates to the technical field of bored piles, and in particular to a leak-sealing device and a method for bored pile construction. Background Technology

[0002] Pile foundations are the foundation of bridges, and most existing pile foundations are constructed using the mud-wall drilling and grouting pile construction technique. During pile foundation construction, encountering karst caves or poor geological conditions can easily lead to grout leakage during drilling, resulting in drilling stagnation and borehole collapse. To solve the grout leakage problem, the commonly used method is to backfill the drilled borehole with materials such as loess, rubble, and cement to seal the leakage.

[0003] Related technology can be found in Chinese Patent No. CN114319337B, which discloses a plugging device and a method for drilling pile construction. The plugging device for drilling pile construction includes a top casing and at least one first-stage plugging casing. All the plugging casings are arranged vertically below the top casing. The outer diameter of the lower plugging casing is smaller than the inner diameter of the upper plugging casing, and the outer diameter of the uppermost plugging casing is smaller than the inner diameter of the top casing. One end of each plugging casing has a water-swellable structure, which is used to seal the gap between the plugging casing and the inner wall of the top casing or the gap between the plugging casing and the inner wall of adjacent plugging casings. This device can better seal leaks during drilling, has a high success rate, reduces resource waste, enables continuous construction, accelerates bridge construction progress, and lowers construction costs.

[0004] However, the above solutions still have certain limitations. For example, the fixed cross-sectional design of the sealing casing makes it difficult to adapt to pile holes with different cross-sectional sizes, which may lead to poor sealing performance and thus affect the overall sealing effect and construction quality. Summary of the Invention

[0005] This application provides a leak-sealing device and a drilling pile construction method for bored pile construction, which can unfold into a corresponding shape according to the change of the leak location, thereby better fitting and filling the gaps that cause leaks.

[0006] This application provides a leak-sealing device and a drilling pile construction method for bored pile construction, which adopts the following technical solution:

[0007] A leak-sealing device and a method for drilling pile construction are disclosed. The leak-sealing device includes a top casing located at the pile hole position and a leak-sealing head suspended at the leak point in the pile hole. A steel rope is attached to the leak-sealing head, which passes through the top casing and is lowered to the leak point within the pile hole. The leak-sealing head includes 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 equipped with features for securing the lowered fixed sleeve to the inner wall of the pile hole. The fixing component includes an outwardly expanding rod between the fixed sleeve and the movable sleeve. The outwardly expanding rod is set at equal angles around the central axis of the fixed sleeve. A water-swellable sealing strip is provided on the outer surface of the outwardly expanding rod. After the fixed sleeve is fixed, the movable sleeve moves towards the fixed sleeve by winding up the steel rope. At this time, the outwardly expanding rod between the movable sleeve and the fixed sleeve folds, and the outwardly expanding rod expands until the water-swellable sealing strip on the outside of the outwardly expanding rod contacts the leakage point on the inner wall of the pile hole.

[0008] By adopting the above technical solution, the leak-sealing device consists of a fixed sleeve, a movable sleeve, and a bendable expanding rod. The fixed sleeve is firmly installed on the inner wall of the pile hole by a fixing component, while the movable sleeve is connected to a steel rope and can be moved by winding the steel rope. The expanding rod provides connection and support between the fixed sleeve and the movable sleeve. When the movable sleeve moves towards the fixed sleeve, the expanding rod folds, generating appropriate deformation due to the flexibility of the material. At the same time, the outer surface of the expanding rod is equipped with a water-swellable sealing strip. When the expanding rod comes into contact with the leakage point on the inner wall of the pile hole, the sealing strip expands due to the action of water, thereby forming an effective seal and achieving the purpose of leak sealing. The water-swellable sealing strip can quickly and efficiently seal the leakage point, thereby significantly improving the leak-sealing efficiency. In addition, the bendable expanding rod design allows it to unfold into a corresponding shape according to the change of the leakage location, better fitting and filling the gaps causing the leakage.

[0009] Preferably, the top inner ring opening of the top protective sleeve is provided with a reinforcing sleeve, the top of the reinforcing sleeve is turned outward and forms a snap-fit ​​part on the top of the top protective sleeve.

[0010] By adopting the above technical solution, the locking part formed on the reinforced sleeve can increase the connection strength with the ground and prevent the sleeve from sliding or shifting due to mechanical action during construction and use.

[0011] Preferably, the top of the reinforcing sleeve is provided with a plurality of guide components for guiding the steel rope. The guide components are arranged at equal angles around the central axis of the reinforcing sleeve. Each guide component includes a mounting frame, on which a first guide wheel and a second guide wheel are provided. The steel rope passes through the first guide wheel and the second guide wheel alternately.

[0012] By adopting the above technical solution, the guiding component forms a guiding system through the first and second guide wheels installed on the reinforcing sleeve, which helps the steel rope move along a specific path, thereby ensuring stability and safety during the hoisting process.

[0013] Preferably, the inner wall of the reinforcing sleeve is provided with a first limiting sleeve that matches the number of steel ropes, and the interior of the first limiting sleeve is provided with a through hole for the steel ropes to pass through.

[0014] By adopting the above technical solution, the through hole design allows the steel rope to pass through 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.

[0015] Preferably, the fixing member includes an inclined insertion hole disposed inside the fixing sleeve. The inclined insertion hole is inclined downward toward the inner wall of the pile hole. Several inclined insertion holes are distributed at equal angles around the central axis of the fixing sleeve. Each inclined insertion hole of the fixing sleeve is provided with an inclined insertion rod inside. By striking the top of the inclined insertion rod, the inclined insertion rod slides along the inside of the inclined insertion hole until it is inclined downward and inserted into the inner wall of the pile hole.

[0016] By adopting the above technical solution, the top of the inclined rod is struck, causing the inclined rod to slide along the inside of the inclined hole until it is inserted into the inner wall of the pile hole at a downward angle; this helps to enhance the fixing effect.

[0017] Preferably, the material of the expansion rod is thermoplastic polyurethane, and the expansion rod includes a first expansion portion, a straight portion and a second expansion portion. The first expansion portion, the straight portion and the second expansion portion of the expansion rod form a V-shaped cross-section, and a first groove is formed between the first expansion portion and the straight portion of the expansion rod, and a second groove is formed between the straight portion and the second expansion portion of the expansion rod.

[0018] By adopting the above technical solution, the V-shaped cross-section design of the expansion rod and the setting of the first and second slots enable the joints between the first expansion part and the straight part, as well as between the second expansion part and the straight part, to deform flexibly when subjected to longitudinal compression. When an external force is applied, the deformation of these joints causes the expansion rod to unfold at different angles, thereby achieving the function of adapting to pile holes of different diameters.

[0019] Preferably, the first and second outward expansion portions of the water-swellable sealing strip are evenly distributed with protrusions, and the cross-section of the protrusions is a semi-circular structure.

[0020] By adopting the above technical solution, the semi-circular protrusion can effectively increase the contact area between the waterstop strip and the soil or surrounding structure, thereby improving the sealing effect.

[0021] Preferably, the water-swellable sealing strip is located on the straight portion of the outward-expanding rod.

[0022] By adopting the above technical solution, when the expansion rod expands outward, the straight part contacts the leak, and the straight part forms a transition slope at the first and second expansion parts of the expansion rod, which effectively seals the leak.

[0023] Preferably, the inner ring of the fixed sleeve near its bottom and the inner ring of the movable sleeve near its top are both provided with water-swellable sealing rings.

[0024] By adopting the above technical solution, the design of the water-swellable sealing ring of the fixed sleeve and the water-swellable sealing ring of the movable sleeve allows them to work together to form an effective sealing system; when the movable sleeve is in motion, the water-swellable sealing ring maintains the seal by expanding, preventing water leakage into the system.

[0025] Preferred, the drilling pile construction method for a leak-sealing device for drilled pile construction includes the following construction steps:

[0026] S1: Conduct a detailed survey of the construction site, including geological conditions and groundwater level; prepare drilling machines, concrete mixers, and leak-sealing devices; then set up safety protection measures to ensure worker safety;

[0027] 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 carry out drilling operations and drill to the designed depth;

[0028] S3: Check the depth and diameter of the borehole, and install a top casing at the top opening of the pile hole. Install a reinforcing sleeve at the top inner opening of the top casing to ensure construction quality.

[0029] S4: When grout leakage is encountered during drilling, the plugging head is lowered to the leakage point by steel rope, and the sinking fixing sleeve is fixed to the inner wall of the pile hole by fixing components.

[0030] S5: After the fixed sleeve is fixed, the moving sleeve moves toward the fixed sleeve by winding the steel rope. At this time, the outer expansion rod between the moving sleeve and the fixed sleeve is folded. The outer expansion rod expands until the water-swelling water-stop strip on the outside of the outer expansion rod contacts the leakage point on the inner wall of the pile hole, and then the drilling construction continues.

[0031] S6: After confirming the effectiveness of the sealing measures, proceed with the concrete pouring operation; maintain the uniformity and fluidity of the concrete to avoid voids.

[0032] By adopting the above technical solution

[0033] In summary, this application has the following beneficial effects:

[0034] 1. This leak-sealing device for bored pile construction consists of a fixed sleeve, a movable sleeve, and a bendable expanding rod. The fixed sleeve is securely installed on the inner wall of the pile hole via fasteners, while the movable sleeve is connected to a steel rope and can be moved by winding the steel rope. The expanding rod provides connection and support between the fixed sleeve and the movable sleeve. When the movable sleeve moves towards the fixed sleeve, the expanding rod folds, utilizing the flexibility of the material to produce appropriate deformation. Simultaneously, the outer surface of the expanding rod is equipped with a water-swellable sealing strip. When the expanding rod contacts a leak point on the inner wall of the pile hole, the sealing strip expands due to the moisture, thus forming an effective seal and achieving the purpose of leak sealing. The water-swellable sealing strip can quickly and efficiently seal leak points, thereby significantly improving leak-sealing efficiency. In addition, the bendable expanding rod design allows it to unfold into a corresponding shape according to changes in the location of the leak, better fitting and filling the gaps causing the leak.

[0035] 2. The drilling pile construction method using the leakage-sealing device for this type of bored pile construction involves several key aspects. First, a detailed site survey is conducted to identify potential geological problems before construction, ensuring the safety and effectiveness of the project. Second, precise layout and drilling techniques are employed to improve the accuracy of pile positions and ensure construction quality. Furthermore, the rapid response of the leakage-sealing equipment can promptly resolve issues in case of grout leakage, preventing water leakage from affecting subsequent construction. Finally, the emphasis on uniformity and fluidity during the concrete pouring stage helps improve the overall stability and durability of the project, thereby ensuring its longevity and reliability. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of the plugging device used in the construction of bored piles in this embodiment;

[0037] Figure 2 This is an overall cross-sectional view of the top protective sleeve in this embodiment;

[0038] Figure 3 This is a schematic diagram of the internal structure of the external expansion rod in this embodiment;

[0039] Figure 4 This is a schematic diagram of the overall structure of the leak-stopping head in this embodiment;

[0040] Explanation of reference numerals in the attached drawings: 1. Top protective sleeve; 2. Leak-stopping head; 201. Fixed sleeve; 202. Movable sleeve; 203. Fixing component; 204. Water-swellable sealing strip; 205. Outward expansion rod; 20501. First outward expansion part; 20502. Straight part; 20503. Second outward expansion part; 20504. First groove; 20505. Second groove; 206. Protrusion; 3. Steel rope; 4. Reinforcing sleeve; 5. Snap-fit ​​part; 6. Guide assembly; 601. Mounting bracket; 602. First guide wheel; 603. Second guide wheel; 7. Water-swellable sealing ring. Detailed Implementation

[0041] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0042] Example

[0043] This invention discloses a leak-sealing device and a method for drilling pile construction, such as... Figure 1 As shown, the leak-sealing device used in bored pile construction includes a top casing 1 located at the pile hole and a leak-sealing head 2 suspended at the leak point in the pile hole. The leak-sealing head 2 is equipped with a steel rope 3. The leak-sealing head 2 is passed through the top casing 1 and lowered to the leak point in the pile hole through the steel rope 3. The leak-sealing head 2 can be lowered from the top casing of the pile hole through the steel rope 3 until it reaches the leak point. This hoisting system can flexibly adjust the depth of the leak-sealing head 2 to ensure that it accurately reaches the leak point.

[0044] like Figure 1 As shown, a reinforcing sleeve 4 is provided at the top inner ring opening of the top casing 1. The reinforcing 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 reinforcing sleeve 4 is turned outward and forms a snap-fit ​​part 5 at the top of the top casing 1. The snap-fit ​​part 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. In addition to increasing stability, the snap-fit ​​part 5 can also improve waterproof and sealing performance, preventing water and mud from leaking from the joints of the casing.

[0045] like Figure 1 As shown, this design ensures that the top casing 1 remains stable during long-term use, reducing the risk of settlement and deformation of beams, columns, or pile foundations, and improving the overall structural safety. The outward-facing snap-fit ​​part 5 design makes it easier to fix the casing during construction, simplifying the operation steps and improving construction efficiency.

[0046] like Figure 1 and Figure 2 As shown, several guide components 6 for guiding the steel rope 3 are fixedly installed on the top of the reinforcing sleeve 4. Four guide components 6 are arranged at equal angles around the central axis of the reinforcing sleeve 4. Specifically, each guide component 6 includes a mounting frame 601, on which a first guide wheel 602 and a second guide wheel 603 are mounted. The steel rope 3 passes through the first guide wheel 602 and the second guide wheel 603 in a staggered manner. The guide components 6, through the first guide wheel 602 and the second guide wheel 603 mounted on the reinforcing sleeve 4, form a guiding system that helps the steel rope 3 move along a specific path, thereby ensuring stability and safety during the hoisting process. The staggered passage of the steel rope 3 through the first and second guide wheels 603 allows for a reasonable vertical configuration of the steel rope 3, making the hoisting 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 component 6 are evenly arranged around the central axis of the reinforcing sleeve 4, providing balanced support force during hoisting, distributing the hoisting weight, and making the entire system more stable.

[0047] like Figure 1 and Figure 2 As shown, a first limiting sleeve matching the number of steel ropes 3 is fixedly installed on the inner wall of the reinforcing sleeve 4. The first limiting sleeve has a through hole for the steel ropes 3 to pass through. The through hole design allows the steel ropes 3 to pass through smoothly, while also providing some support with the side wall of the limiting sleeve. The setting of the through hole position can accurately position the steel ropes 3 and prevent them from being misaligned or tangled during operation.

[0048] 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 member 203, which fixes the sunken fixed sleeve 201 to the inner wall of the pile hole. An outwardly expanding rod 205 is provided between the fixed sleeve 201 and the movable sleeve 202. The outwardly expanding rod 205 is set at equal angles around the central axis of the fixed sleeve 201. A water-swellable water-stop strip 204 is provided on the outer surface of the outwardly expanding rod 205. After the fixed sleeve 201 is fixed, the movable sleeve 202 moves towards the fixed sleeve 201 by winding the steel rope 3. At this time, the outwardly expanding rod 205 between the movable sleeve 202 and the fixed sleeve 201 folds, and the outer surface of the outwardly expanding rod 205... The expansion rod 205 is extended until the water-swellable sealing strip 204 on its outer surface contacts the leakage point on the inner wall of the pile hole. The plugging head 2 consists of a fixed sleeve 201, a movable sleeve 202, and a bent expansion rod 205. The fixed sleeve 201 is firmly fixed to the inner wall of the pile hole by a fastener 203, while the movable sleeve 202 is connected to a steel rope 3 and can be moved by winding the steel rope 3. The expansion rod 205 serves as a connection and support between the fixed and movable sleeves 202. When the movable sleeve 202 moves toward the fixed sleeve 201, the expansion rod 205 will fold, utilizing the flexibility of the material to produce appropriate deformation. The outer surface of the expansion rod 205 is provided with a water-swellable sealing strip. When the expansion rod 205 contacts the leakage point on the inner wall of the pile hole, the sealing strip will expand due to moisture, thereby forming a seal and achieving the effect of plugging the leakage.

[0049] like Figure 3 and Figure 4 As shown, the water-swellable sealing strip can quickly and effectively plug the leak, improving the efficiency of leak sealing; the bendable outward expansion rod 205 can unfold into the corresponding shape according to the different locations of the leak, so that it can better fit and fill the gaps that cause the leak.

[0050] like Figure 3 and Figure 4 As shown, specifically, the fixing member 203 includes an inclined insertion hole disposed inside the fixing sleeve 201. The inclined insertion hole is inclined downward toward the inner wall of the pile hole. Several inclined insertion holes are distributed at equal angles around the central axis of the fixing sleeve 201. Each inclined insertion hole of the fixing sleeve 201 is provided with an inclined rod inside. By striking the top of the inclined rod, the inclined rod slides along the inside of the inclined insertion hole until it is inclined downward and inserted into the inner wall of the pile hole. At this time, the shape and surface of the inclined rod increase the contact area with the inner wall of the pile hole, which helps to enhance the fixing effect. Once the inclined rod is successfully inserted into the inner wall of the pile hole, the inclined surface of the inclined rod can generate friction with the pile hole, ensuring that the fixing sleeve 201 is stable and immovable inside the pile hole.

[0051] like Figure 3 and Figure 4 As shown, the material of the expansion rod 205 is thermoplastic polyurethane. The expansion rod 205 includes a first expansion portion 20501, a straight portion 20502, and a second expansion portion 20503. The first expansion portion 20501, the straight portion 20502, and the second expansion portion 20503 of the expansion rod 205 form a V-shaped cross-section. A first slot 20504 is formed between the first expansion portion 20501 and the straight portion 20502 of the expansion rod 205. A second slot 20505 is formed between the straight portion 20502 of the 05 and the second expansion portion 20503 of the expansion rod 205. When the expansion rod 205 is subjected to longitudinal compression, the first expansion portion 20501 and the straight portion 20502 will deform at the first slot 20504, and the second expansion portion 20503 and the straight portion 20502 will deform at the second slot 20505, thereby realizing the change of angle of the V-shaped expansion rod 205, so as to adapt to pile holes of different diameters.

[0052] like Figure 3 As shown, the V-shaped cross-section design of the outward expansion rod 205 and the setting of the first slot 20504 and the second slot 20505 enable the joints between the first outward expansion portion 20501 and the straight portion 20502, and between the second outward expansion portion 20503 and the straight portion 20502, to deform flexibly when subjected to longitudinal compression. When an external force is applied, the deformation of these joints causes the outward expansion rod 205 to unfold at different angles, thereby realizing the function of adapting to pile holes of different diameters.

[0053] 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 part 20502, but also evenly distributed to the first expansion part 20501 and the second expansion part 20503; thereby effectively reducing the risk of local stress concentration and avoiding premature fatigue or fracture of the material.

[0054] like Figure 3 As shown, the water-swellable sealing 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 leak, 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 effectively seals the leak.

[0055] like Figure 3As shown, the first outward expansion 20501 and the second outward expansion 20503 of the water-swellable sealing strip 204 are uniformly distributed with protrusions 206. The cross-section of the protrusions 206 is semi-circular. The semi-circular protrusions 206 can effectively increase the contact area between the sealing strip and the soil or surrounding structure, thereby improving the sealing effect. The larger contact area helps the sealing strip provide better support and compression when water expands. The semi-circular design helps guide water flow and disperse water pressure, prevent water from concentrating at a certain point, and reduce potential damage or leakage.

[0056] like Figure 3 As shown, the inner ring of the fixed sleeve 201 near its bottom and the inner ring of the movable sleeve 202 near its top are both provided with water-swellable sealing rings 7. The water-swellable sealing rings 7 and the water-swellable sealing strips 204 are made of the same material. The water-swellable sealing rings 7 expand when in contact with water, forming a tight seal. Furthermore, the sealing rings of the inner ring of the fixed sleeve 201 and the water-swellable sealing rings 7 of the movable sleeve 202 are made of the same material, which ensures that their expansion performance is consistent under the same humidity and temperature conditions, avoiding differences in sealing effect due to different materials. The design of the water-swellable sealing rings 7 of the fixed sleeve 201 and the movable sleeve 202 allows them to work together to form an effective sealing system. When the movable sleeve 202 is in motion, the water-swellable sealing rings 7 maintain the seal through expansion, preventing water leakage into the system.

[0057] The construction method for the sealing device used in bored pile construction includes the following steps:

[0058] S1: Conduct a detailed survey of the construction site, including geological conditions and groundwater level; prepare drilling machines, concrete mixers, and leak-sealing devices; then set up safety protection measures to ensure worker safety;

[0059] 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 carry out drilling operations and drill to the designed depth;

[0060] S3: Check the depth and diameter of the borehole, and install the top casing 1 at the top opening of the pile hole. Install the reinforcing sleeve 4 at the top inner ring opening of the top casing 1 to ensure construction quality.

[0061] S4: When grout leakage is encountered during drilling, the plugging head 2 is lowered to the leakage point by steel rope 3, and the sinking fixing sleeve 201 is fixed to the inner wall of the pile hole by fixing component 203.

[0062] S5: After the fixed sleeve 201 is fixed, the moving sleeve 202 moves toward the fixed sleeve 201 by winding the steel rope 3. At this time, the outer expansion rod 205 between the moving sleeve 202 and the fixed sleeve 201 is folded. The outer expansion rod 205 expands until the water-swellable waterstop strip 204 on the outside of the outer expansion rod 205 contacts the leakage point on the inner wall of the pile hole, and then the drilling construction continues.

[0063] S6: After confirming the effectiveness of the sealing measures, proceed with the concrete pouring operation; maintain the uniformity and fluidity of the concrete to avoid voids.

[0064] Working Principle: Before use, construction personnel first conduct a comprehensive survey of the construction site to understand the geological conditions and groundwater level. Then, they prepare a drilling rig, concrete mixer, and leak-sealing device, and establish safety precautions to ensure worker safety. They then accurately lay out the drilling positions according to the design drawings. The drilling rig is then used to drill to the designed depth.

[0065] Check the depth and diameter of the borehole to ensure they meet design requirements. Install a top casing 1 at the top opening of the pile hole, and install a reinforcing sleeve 4 at the top inner opening of the casing to improve construction quality. If grout leakage is encountered during drilling, use a steel rope 3 to lower the plug 2 to the leakage point, and then use a fixing member 203 to securely install the sunken fixing sleeve 201 onto the inner wall of the pile hole.

[0066] After the fixed sleeve 201 is secured, the moving sleeve 202 is moved toward the fixed sleeve 201 by winding the steel rope 3. At this time, the outward expansion rod 205 between the moving sleeve 202 and the fixed sleeve 201 folds and expands simultaneously until the expanded part of the outward expansion rod 205 contacts the leakage point on the inner wall of the pile hole.

[0067] After ensuring the sealing measures are effective, proceed with the concrete pouring operation. Maintain the uniformity and fluidity of the concrete to prevent voids from forming.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A leak-sealing device for bored pile construction, comprising a top casing (1) located at the pile hole and a leak-sealing head (2) suspended at the leak in the pile hole, characterized in that: The plugging head (2) is equipped with a steel rope (3), through which the plugging head (2) passes through the top protective sleeve (1) and sinks to the leak point in the pile hole; 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 equipped with a fixing member (203) for fixing the sinking fixed sleeve (201) to the inner wall of the pile hole, and an outwardly expanding rod (205) that can be bent outwards is provided between the fixed sleeve (201) and the movable sleeve (202). The expansion rod (205) is set at equal angles around the central axis of the fixed sleeve (201). The outer surface of the expansion rod (205) is provided with a water-swellable sealing strip (204). After the fixed sleeve (201) is fixed, the moving sleeve (202) is moved towards the fixed sleeve (201) by winding the steel rope (3). At this time, the expansion rod (205) between the moving sleeve (202) and the fixed sleeve (201) is folded. The expansion rod (205) expands outward until the water-swellable sealing strip (204) on the outside of the expansion rod (205) contacts the leakage point on the inner wall of the pile hole.

2. The leak-sealing device for bored pile construction according to claim 1, characterized in that: The top inner ring opening of the top protective sleeve (1) is provided with a reinforcing sleeve (4), the top of the reinforcing sleeve (4) is turned outward and forms a snap-fit ​​part (5) on the top of the top protective sleeve (1).

3. The leak-sealing device for bored pile construction according to claim 2, characterized in that: The top of the reinforcing sleeve (4) is provided with a number of guide components (6) for guiding the steel rope (3). The guide components (6) are arranged at equal angles around the central axis of the reinforcing sleeve (4). The guide components (6) include a mounting frame (601). The mounting frame (601) is provided with a first guide wheel (602) and a second guide wheel (603). The steel rope (3) passes through the first guide wheel (602) and the second guide wheel (603) alternately.

4. The leak-sealing device for bored pile construction according to claim 3, characterized in that: The inner wall of the reinforcing sleeve (4) is provided with a first limiting sleeve that matches the number of steel ropes (3), and the inside of the first limiting sleeve is provided with a through hole for the steel ropes (3) to pass through.

5. The leak-sealing device for bored pile construction according to claim 1, characterized in that: The fastener (203) includes an inclined insertion hole disposed inside the fixing sleeve (201). The inclined insertion hole is inclined downward toward the inner wall of the pile hole. Several inclined insertion holes are distributed at equal angles around the central axis of the fixing sleeve (201). An inclined insertion rod is disposed inside each inclined insertion hole of the fixing sleeve (201). By striking the top of the inclined insertion rod, the inclined insertion rod slides along the inside of the inclined insertion hole until it is inclined downward and inserted into the inner wall of the pile hole.

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

7. The leak-sealing device for bored pile construction according to claim 6, characterized in that: The water-swellable sealing strip (204) has protrusions (206) evenly distributed on the first expansion portion (20501) and the second expansion portion (20503), and the cross-section of the protrusions (206) is a semi-circular structure.

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

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

10. A method for constructing bored piles using a plugging device as described in any one of claims 1-9, characterized in that: Its construction steps include: S1: Conduct a detailed survey of the construction site, including geological conditions and groundwater level; prepare drilling machines, concrete mixers, and leak-sealing devices; then set up safety protection measures to ensure worker safety; 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 carry out drilling operations and drill to the designed depth; S3: Check the depth and diameter of the borehole, and install the top casing (1) at the top opening of the pile hole, and install the reinforcing sleeve (4) at the top inner ring opening of the top casing (1) to ensure construction quality. S4: When drilling encounters grout leakage, the plugging head (2) is lowered to the leakage point by steel rope (3), and the sinking fixing sleeve (201) is fixed to the inner wall of the pile hole by fixing component (203). S5: After the fixed sleeve (201) is fixed, the moving sleeve (202) is moved towards the fixed sleeve (201) by winding the steel rope (3). At this time, the outer expansion rod (205) between the moving sleeve (202) and the fixed sleeve (201) is folded. The outer expansion rod (205) expands until the water-swellable sealing strip (204) on the outside of the outer expansion rod (205) contacts the leakage point on the inner wall of the pile hole, and then the drilling construction continues. S6: After confirming the effectiveness of the sealing measures, proceed with the concrete pouring operation; maintain the uniformity and fluidity of the concrete to avoid voids.

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