Anti-collapse device for construction hole wall of super-long strongly-weathered cast-in-place pile
By designing an adjustment mechanism and support components for an anti-collapse device for the borehole wall of ultra-long, strongly weathered cast-in-place piles, the problem of simple structure and single function of existing devices has been solved. This device enables flexible adjustment and self-adaptive protection of the borehole wall, significantly reducing the risk of borehole wall collapse and improving construction stability and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FU JIAN ER JIAN JIAN SHE JI TUAN GONG SI
- Filing Date
- 2025-05-22
- Publication Date
- 2026-04-28
AI Technical Summary
When constructing cast-in-place piles in extremely long and highly weathered geological layers, the borehole wall is prone to instability due to mechanical disturbance and groundwater seepage, leading to collapse. Existing auxiliary support devices have simple structures and single functions, making it difficult to flexibly adjust and adaptively protect them according to the actual conditions of the borehole wall.
A device for preventing the collapse of the borehole wall of ultra-long, highly weathered cast-in-place piles was designed, including an adjustment mechanism and a support component. The height can be adjusted by the cooperation of threaded pipe and threaded rod, and the protective plate of the support component can be adjusted adaptively. Combined with the buffer mechanism, it absorbs the impact force and provides all-round support and protection.
It effectively reduces the risk of borehole wall collapse, improves the adaptability and stability of the device under complex geological conditions, enhances construction efficiency, and prevents borehole walls from collapsing due to excessive instantaneous stress.
Smart Images
Figure CN224173342U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of cast-in-place pile protection equipment, and in particular relates to a device for preventing the collapse of the borehole wall of ultra-long, strong, weathered cast-in-place piles. Background Technology
[0002] In modern construction engineering, cast-in-place pile foundations have become a common foundation type for large-scale projects such as high-rise buildings and bridges due to their strong bearing capacity and wide geological adaptability. However, constructing cast-in-place piles in extremely long and highly weathered geological layers presents significant challenges. Highly weathered rock layers, due to long-term weathering, have a loose and fragmented rock structure, poor cementation, and significantly reduced mechanical properties. During drilling, the borehole wall is highly susceptible to instability due to mechanical disturbances, groundwater seepage, and other factors, leading to collapse.
[0003] Currently, traditional borehole wall anti-collapse measures, such as mud slurry wall protection, involve preparing mud slurry with a certain specific gravity, viscosity, and colloidal content to form a mud cake on the borehole wall to maintain stability. However, under ultra-long and highly weathered geological conditions, due to the large porosity and high permeability of the rock strata, the mud slurry is easily lost in large quantities, making it difficult to form an effective mud cake, resulting in poor anti-collapse effects. In addition, some auxiliary support devices have simple structures and single functions, and cannot be flexibly adjusted and adaptively protected according to the actual situation of the borehole wall, making it difficult to meet the strict requirements for borehole wall stability in the construction of ultra-long and highly weathered cast-in-place piles.
[0004] To address these issues, we provide a device for preventing the collapse of the borehole wall in ultra-long, high-strength weathered cast-in-place piles. Utility Model Content
[0005] The purpose of this utility model is to provide a device for preventing the collapse of the borehole wall in ultra-long, strong weathered cast-in-place piles. Through the cooperation of the adjustment mechanism and the support components, it solves the problem that some auxiliary support devices in the prior art have simple structures and single functions, and cannot be flexibly adjusted and adaptively protected according to the actual situation of the borehole wall.
[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.
[0007] This utility model relates to a device for preventing the collapse of the borehole wall in ultra-long, high-strength weathered cast-in-place piles. It includes a connecting frame, with an adjusting mechanism fixedly connected to the bottom of the connecting frame. Support components are fixedly connected to both sides of the adjusting mechanism. The adjusting mechanism includes two connecting columns. The top of each connecting column is fixedly connected to the connecting frame, and a threaded pipe is fixedly connected to the bottom of each connecting column. A threaded rod is threadedly connected to the bottom of the threaded pipe, and a support column is fixedly connected to the bottom of the threaded rod. A positioning block is fixedly connected to the bottom of the support column, and a fixing frame is fixedly connected to the bottom of the positioning block. Sliding rods are fixedly connected to both sides of the top of the fixing frame, and sleeves are slidably connected to the top of the sliding rods. The top of the device is fixedly connected to the connecting frame. Two connecting columns are vertically set, and their tops are fixedly connected to the connecting frame by welding to ensure the stability of the connection. The inner wall of the threaded tube is machined with a standard internal thread for use with the threaded rod to achieve the height adjustment function. The outer wall of the threaded rod is provided with an external thread that matches the internal thread of the threaded tube. By rotating the threaded rod, it can move up and down inside the threaded tube, thereby adjusting the height of the entire adjustment mechanism. The sleeve is fitted on the outside of the slide rod, and its inner wall fits tightly with the outer wall of the slide rod, allowing it to slide up and down on the slide rod. The top of the sleeve is fixedly connected to the connecting frame. Through the cooperation of the slide rod and the sleeve, the connecting frame can remain stable when adjusting the height, avoiding shaking or tilting.
[0008] The present invention is further configured such that the support assembly includes a mounting base, and the number of mounting bases is four. One side of the mounting base is fixedly connected to a sliding rod and a sleeve, respectively. Mounting grooves are provided on the top and bottom of both sides of the mounting base surface. A connecting arm is movably connected to the inner cavity of the mounting groove. A protective plate is movably connected to one side of the connecting arm through a rotating shaft. A buffer mechanism is fixedly connected to one side of the mounting base. The mounting base is fixed to the sliding rod and the sleeve, respectively, to provide a stable mounting foundation for the support assembly. The mounting groove cooperates with the connecting arm to allow the protective plate to move around the rotating shaft, and can adaptively adjust according to the irregular shape of the hole wall to closely fit the hole wall surface.
[0009] The present invention is further configured such that the buffer mechanism includes a sleeve, one side of which is fixedly connected to a mounting base, a movable column is fixedly connected to one side of the inner cavity of the sleeve, a spring is fixedly connected to one side of the movable column, a buffer rod is fixedly connected to one side of the spring, and a buffer rod is fixedly connected to one side of the protective plate. When the bore wall is subjected to external disturbance and pressure fluctuations occur, the protective plate transmits the force to the buffer rod, which pushes the spring to compress and deform within the sleeve. The spring can quickly absorb energy, slow down the transmission of force, effectively reduce the impact force on the bore wall, and prevent the bore wall from collapsing due to excessive instantaneous force. The movement of the movable column within the sleeve ensures that the spring compression and rebound process is smooth, ensuring that the buffering force acts continuously and stably on the protective plate, thereby improving the protection effect on the bore wall.
[0010] The present invention is further configured such that a movable groove is provided at the top of the connecting frame, and a connecting rod is movably connected to the inner cavity of the movable groove through a rotating shaft. A positioning pin is provided through one side of the connecting rod. When it is necessary to connect and fix the device to the external structure, the positioning pin can be inserted to achieve a stable connection. This is not only convenient and quick, but also reduces cumbersome installation steps and greatly improves construction efficiency compared to traditional connection methods.
[0011] The present invention is further configured such that there are six connecting rods, and the six connecting rods are distributed in a circle. The six circumferentially distributed connecting rods allow the device to have more angle options when connecting to the outside, and can flexibly adjust the connection method according to different construction scenarios and external structural characteristics.
[0012] The present invention is further provided that a handle is fixedly connected to the top of the surface of the support column, and the surface of the handle is provided with anti-slip texture. The handle is made of anti-slip rubber material and is provided with anti-slip texture, which provides a comfortable and stable grip point for construction personnel when installing and adjusting the device. Construction personnel can easily rotate the threaded rod to adjust the height of the device through the handle.
[0013] The present invention is further configured such that the protective plate is an arc-shaped structure, and there are two sets of protective plates, each set having two plates, which are symmetrically arranged. The two sets of symmetrically arranged arc-shaped protective plates form a surrounding protection for the hole wall from multiple directions, expanding the protection range, evenly dispersing the pressure on the hole wall, effectively avoiding the risk of collapse caused by local stress concentration, and providing all-round and reliable support protection for the hole wall.
[0014] The present invention has the following beneficial effects.
[0015] 1. This utility model allows for convenient adjustment of the height of the support column through the threaded connection between the threaded pipe and the threaded rod, thereby controlling the position of the entire device within the hole and the supporting force on the hole wall. The cooperation of the fixed frame, sliding rod, and sleeve ensures the stability of the device during adjustment, preventing shaking. The cooperation between the positioning block and the fixed frame enhances the overall stability of the device, effectively preventing displacement during construction, providing a reliable supporting foundation for the hole wall, and significantly reducing the risk of hole wall collapse.
[0016] 2. The protective plate of this utility model is movably connected to the mounting base through the connecting arm. It can be flexibly adjusted according to the shape of the hole wall and the actual stress situation, closely fitting the hole wall to achieve all-round protection. The setting of multiple protective plates expands the protection range, effectively disperses the pressure on the hole wall, improves the adaptability of the device to different hole diameters and hole wall conditions, and ensures the stability of the hole wall under complex geological conditions. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.
[0018] Figure 1 This is a three-dimensional diagram of a device for preventing the collapse of the borehole wall in ultra-long, strongly weathered cast-in-place piles.
[0019] Figure 2 This is a three-dimensional view of the mounting base in a device for preventing collapse of the borehole wall of an ultra-long, highly weathered cast-in-place pile.
[0020] Figure 3 This is a three-dimensional view of the connecting frame and its connecting structure in a device for preventing collapse of the borehole wall of an ultra-long, strongly weathered cast-in-place pile.
[0021] Figure 4 This is a three-dimensional diagram of the buffer mechanism in a borehole wall anti-collapse device for ultra-long, strong weathered cast-in-place piles.
[0022] Figure 5 This is a three-dimensional diagram of the adjustment mechanism in a device for preventing the collapse of the borehole wall of an ultra-long, highly weathered cast-in-place pile.
[0023] In the attached diagram: 1. Connecting frame; 2. Adjusting mechanism; 21. Connecting column; 22. Threaded pipe; 23. Threaded rod; 24. Support column; 25. Positioning block; 26. Fixing frame; 27. Slide rod; 28. Sleeve; 3. Support assembly; 31. Mounting base; 32. Mounting groove; 33. Connecting arm; 34. Protective plate; 35. Buffer mechanism; 351. Sleeve; 352. Movable column; 353. Spring; 354. Buffer rod; 4. Movable groove; 5. Connecting rod; 6. Positioning pin; 7. Handle. Detailed Implementation
[0024] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments. Example 1
[0025] Please see Figures 1-5This utility model is a device for preventing the collapse of the borehole wall of an ultra-long, strong weathered cast-in-place pile. It includes a connecting frame 1, an adjusting mechanism 2 fixedly connected to the bottom of the connecting frame 1, and support components 3 fixedly connected to both sides of the adjusting mechanism 2. The adjusting mechanism 2 includes two connecting columns 21. The top of the connecting column 21 is fixedly connected to the connecting frame 1, and a threaded pipe 22 is fixedly connected to the bottom of the connecting column 21. A threaded rod 23 is threadedly connected to the bottom of the threaded pipe 22. A support column 24 is fixedly connected to the bottom of the threaded rod 23. A positioning block 25 is fixedly connected to the bottom of the support column 24. A fixing frame 26 is fixedly connected to the bottom of the positioning block 25. Sliding rods 27 are fixedly connected to both sides of the top of the fixing frame 26. A sleeve 28 is slidably connected to the top of the sliding rod 27. The top of the sleeve 28 is fixedly connected to the connecting frame 1.
[0026] Specifically: Two connecting columns 21 are vertically arranged, and their tops are fixedly connected to the connecting frame 1 by welding to ensure the stability of the connection. The inner wall of the threaded tube 22 is machined with a standard internal thread for cooperating with the threaded rod 23 to achieve the height adjustment function. The outer wall of the threaded rod 23 is provided with an external thread that matches the internal thread of the threaded tube 22. By rotating the threaded rod 23, it can move up and down inside the threaded tube 22, thereby adjusting the height of the entire adjustment mechanism 2. The sleeve 28 is fitted on the outside of the slide rod 27, and its inner wall is tightly fitted with the outer wall of the slide rod 27, allowing it to slide up and down on the slide rod 27. The top of the sleeve 28 is fixedly connected to the connecting frame 1. Through the cooperation of the slide rod 27 and the sleeve 28, the connecting frame 1 can remain stable when adjusting the height, avoiding shaking or tilting. Example 2
[0027] Please see Figures 1-5Based on Embodiment 1, the support assembly 3 includes four sets of mounting seats 31. One side of each mounting seat 31 is fixedly connected to the slide rod 27 and the sleeve 28, respectively. Mounting grooves 32 are provided at the top and bottom of both sides of the mounting seat 31. A connecting arm 33 is movably connected to the inner cavity of the mounting groove 32. A guard plate 34 is movably connected to one side of the connecting arm 33 via a rotating shaft. A buffer mechanism 35 is fixedly connected to one side of the mounting seat 31. The buffer mechanism 35 includes a sleeve 351. One side of the sleeve 28 is fixedly connected to the mounting seat 31. A movable column 352 is fixedly connected to one side of the inner cavity of the sleeve 351. A spring 353 is fixedly connected to one side of 352, and a buffer rod 354 is fixedly connected to one side of the spring 353. One side of the buffer rod 354 is fixedly connected to the guard plate 34. A movable groove 4 is opened at the top of the connecting frame 1. A connecting rod 5 is movably connected to the inner cavity of the movable groove 4 through a rotating shaft. A positioning pin 6 is provided through one side of the connecting rod 5. There are six connecting rods 5, and the six connecting rods 5 are distributed in a circle. A handle 7 is fixedly connected to the top of the surface of the support column 24. The surface of the handle 7 is provided with anti-slip texture. The guard plate 34 has an arc-shaped structure. There are two sets of guard plates 34, and each set has two guard plates 34, which are symmetrically arranged.
[0028] Specifically: Mounting base 31 is fixed to sliding rod 27 and sleeve 28 respectively, providing a stable mounting foundation for support assembly 3. Mounting groove 32 cooperates with connecting arm 33, allowing guard plate 34 to move around the pivot. It can adaptively adjust according to the irregular shape of the hole wall, closely fitting the hole wall surface. When the hole wall is subjected to external disturbances and pressure fluctuations occur, guard plate 34 transmits force to buffer rod 354. Buffer rod 354 pushes spring 353 to compress and deform within sleeve 351. Spring 353 can quickly absorb energy, slow down the force transmission, effectively reduce the impact force on the hole wall, and prevent the hole wall from collapsing due to excessive instantaneous force. The movement of movable column 352 within sleeve 351 ensures smooth compression and rebound of spring 353, ensuring that the buffering force acts continuously and stably on guard plate 34, improving the protection effect on the hole wall. When it is necessary to connect the device to the external... When the structure is fixed, inserting the positioning pin 6 will achieve a stable connection. This is not only convenient and quick, but also reduces cumbersome installation steps and greatly improves construction efficiency compared to traditional connection methods. The six circumferentially distributed connecting rods 5 allow for more angle options when connecting the device to the outside, and can flexibly adjust the connection method according to different construction scenarios and external structural characteristics. The handle 7 is made of non-slip rubber and has anti-slip texture, providing a comfortable and stable grip point for construction personnel when installing and adjusting the device. Construction personnel can easily rotate the threaded rod 23 to adjust the height of the device through the handle 7. The two sets of symmetrically arranged arc-shaped guard plates 34 form a surrounding protection for the hole wall from multiple directions, expanding the protection range, evenly distributing the pressure on the hole wall, effectively avoiding the risk of collapse caused by local stress concentration, and providing all-round and reliable support protection for the hole wall.
[0029] The working principle of this utility model is as follows: the connecting frame 1 is hoisted to a suitable position above the drill hole. By rotating the threaded rod 23, the height of the support column 24 is adjusted by utilizing the threaded engagement between the threaded tube 22 and the threaded rod 23. The sliding rod 27 and the sleeve 28 are tightly engaged to ensure that the connecting frame 1 moves down smoothly and avoids shaking or tilting, thereby achieving the adjustment of the usage height of the device.
[0030] Once the device is lowered to the appropriate depth in the borehole, the guard plate 34, through the movable connection structure between the connecting arm 33 and the mounting base 31, adaptively adjusts according to the irregular shape of the borehole wall. The guard plate 34 can closely fit the surface of the borehole wall, forming a surrounding protection for the borehole wall from multiple directions. The two sets of symmetrically arranged arc-shaped guard plates 34 evenly disperse the pressure on the borehole wall, effectively avoiding local stress concentration and ensuring the stability of the borehole wall in all aspects.
[0031] During the construction of cast-in-place piles, if the borehole wall is disturbed by external factors, such as vibration of the drilling machinery or changes in rock stress, causing pressure fluctuations, the protective plate 34 will be the first to be subjected to pressure. At this time, the protective plate 34 will transfer the force to the buffer rod 354. The buffer rod 354 will push the spring 353 to compress and deform within the sleeve 351. The spring 353 will quickly absorb energy, slow down the transmission of force to the borehole wall, effectively reduce the impact force on the borehole wall, and prevent the borehole wall from collapsing due to excessive instantaneous force. The movement of the movable column 352 within the sleeve 351 will ensure that the compression and rebound process of the spring 353 is smooth, ensuring that the buffer force acts continuously and stably on the protective plate 34, further enhancing the protection effect on the borehole wall.
[0032] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.
Claims
1. A device for preventing collapse of the borehole wall in ultra-long, highly weathered cast-in-place piles, comprising a connecting frame (1), characterized in that: An adjustment mechanism (2) is fixedly connected to the bottom of the connecting frame (1), and support components (3) are fixedly connected to both sides of the adjustment mechanism (2). The adjustment mechanism (2) includes two connecting columns (21). The top of the connecting column (21) is fixedly connected to the connecting frame (1). The bottom of the connecting column (21) is fixedly connected to a threaded tube (22). The bottom of the threaded tube (22) is threadedly connected to a threaded rod (23). The bottom of the threaded rod (23) is fixedly connected to a support column (24). The bottom of the support column (24) is fixedly connected to a positioning block (25). The bottom of the positioning block (25) is fixedly connected to a fixing frame (26). The top of the fixing frame (26) is fixedly connected to two sliding rods (27). The top of the sliding rod (27) is slidably connected to a sleeve (28). The top of the sleeve (28) is fixedly connected to the connecting frame (1).
2. The anti-collapse device for the borehole wall of ultra-long, strongly weathered cast-in-place piles according to claim 1, characterized in that: The support assembly (3) includes a mounting base (31), and there are four sets of mounting bases (31). One side of the mounting base (31) is fixedly connected to the slide rod (27) and the sleeve (28) respectively. The top and bottom of both sides of the surface of the mounting base (31) are provided with mounting grooves (32). The inner cavity of the mounting groove (32) is movably connected to the connecting arm (33). One side of the connecting arm (33) is movably connected to the guard plate (34) through the rotating shaft. One side of the mounting base (31) is fixedly connected to the buffer mechanism (35).
3. The anti-collapse device for the borehole wall of ultra-long, strongly weathered cast-in-place piles according to claim 2, characterized in that: The buffer mechanism (35) includes a sleeve (351), one side of the sleeve (28) is fixedly connected to the mounting base (31), one side of the inner cavity of the sleeve (351) is fixedly connected to a movable column (352), one side of the movable column (352) is fixedly connected to a spring (353), one side of the spring (353) is fixedly connected to a buffer rod (354), and one side of the buffer rod (354) is fixedly connected to the guard plate (34).
4. The anti-collapse device for the borehole wall of ultra-long, strongly weathered cast-in-place piles according to claim 1, characterized in that: The top of the connecting frame (1) is provided with a movable groove (4), and the inner cavity of the movable groove (4) is movably connected to a connecting rod (5) through a rotating shaft. A positioning pin (6) is provided through one side of the connecting rod (5).
5. The anti-collapse device for the borehole wall of ultra-long, strongly weathered cast-in-place piles according to claim 4, characterized in that: The number of connecting rods (5) is six, and the six connecting rods (5) are distributed in a circle.
6. The anti-collapse device for the borehole wall of ultra-long, strongly weathered cast-in-place piles according to claim 1, characterized in that: A handle (7) is fixedly connected to the top of the surface of the support column (24), and the surface of the handle (7) is provided with anti-slip texture.
7. The anti-collapse device for the borehole wall of ultra-long, strongly weathered cast-in-place piles according to claim 2, characterized in that: The guard plate (34) has an arc-shaped structure. There are two sets of guard plates (34), and each set has two guard plates (34) arranged symmetrically.