A foundation pit inclined pile construction method

Abstract

The present application relates to the field of foundation pit inclined pile construction, and specifically discloses a foundation pit inclined pile construction method, which includes the following steps: S1. Construction preparation, leveling the site, setting pile positions in the outer area of ​​the foundation pit to be excavated, and calculating the pile diameter, pile length and inclination angle; S2. Soil drilling, drilling at the pile position according to the set inclination angle to a set depth to form an inclined pile hole; S3. Hole cleaning and hole completion inspection, using a hole cleaning drill bit to clean the hole and inspect the hole completion quality; S4. Lowering the steel cage, providing a guide device on the steel cage to keep the steel cage head end coaxial with the inclined pile hole; then providing a lower cage support device at the inclined pile hole mouth so that the steel cage slides into the inclined pile hole in a direction parallel to the axis of the inclined pile hole; S5. Lower pipe grouting, lowering a guide tube into the steel cage and pouring concrete into the inclined pile hole. The present application has the effect of enabling the steel cage to be placed into the bearing layer in a state where it is not hanging on the inner wall of the inclined pile hole and is coaxial with the inclined pile hole.

Description

Technical Field

[0001] The present application relates to the field of foundation pit inclined pile construction, and in particular to a foundation pit inclined pile construction method. Background Art

[0002] Inclined piles are cantilevered vertical support piles with their tops tilted at a certain angle toward or away from the foundation pit. In foundation pit support projects, inclined piles offer improved bending moment and displacement control compared to straight piles, enabling unsupported support of deeper foundation pits. Inclined cast-in-place piles allow for the construction of larger pile lengths and diameters, further expanding their application. This is particularly true for integrated prefabricated underground structures, where unsupported inclined cast-in-place piles are unsuitable for achieving green, energy-saving, environmentally friendly, and economical construction.

[0003] Currently, mainstream inclined piles are divided into precast inclined piles and cast-in-place inclined piles. Cast-in-place inclined piles are relatively simple to construct and can effectively control construction time and efficiency. However, in actual construction, the core construction method is to place the steel cage in an inclined shape into the inclined pile hole. To ensure the mechanical properties of the inclined pile after completion, the steel cage must maintain a certain degree of coaxiality with the inclined pile hole.

[0004] The applicant discovered during multiple construction projects that, in the process of lowering the steel cage into the inclined pile hole, due to the small gap between the steel cage and the wall of the inclined pile hole, the bottom end of the steel cage can easily touch the inner wall of the inclined pile hole when lowering the steel cage, which not only makes it impossible to lower the steel cage, but also damages the hole wall structure. In severe cases, the heavy weight of the steel cage may cause the hole to collapse. The above phenomenon is more serious during the construction of ultra-long inclined piles, which seriously affects the construction efficiency of the inclined piles and wastes manpower and material resources. Summary of the Invention

[0005] In order to improve the problem that scraping holes are easily occurred when lowering the steel cage during inclined pile construction and it is difficult to maintain coaxiality with the inclined pile hole, the present application provides a foundation pit inclined pile construction method.

[0006] The present application provides a method for construction of inclined foundation pit piles using the following technical solutions:

[0007] A foundation pit inclined pile construction method comprises the following steps:

[0008] S1. Construction preparation: level the site, set up piles in the periphery of the foundation pit to be excavated, and calculate the pile diameter, length, and inclination angle;

[0009] S2 soil drilling, drilling at the pile position according to the set tilt angle to a set depth to form an oblique pile hole;

[0010] S3. Hole cleaning and hole inspection: Use a hole cleaning drill to clean the hole and inspect the hole quality;

[0011] S4. A lower reinforcement cage is provided on the reinforcement cage, wherein the guide device is provided so that the head end of the reinforcement cage is maintained in a coaxial state with the inclined pile hole; and a lower cage support device is provided at the opening of the inclined pile hole so that the reinforcement cage slides into the inclined pile hole in a direction parallel to the axis of the inclined pile hole;

[0012] S5. Lowering the pipe and grouting: lowering the pipe into the steel cage and pouring concrete into the inclined pile hole.

[0013] By adopting the above technical solution, when the steel cage is lowered into the inclined pile hole, the head end of the steel cage is positioned by the guide device and the tail end is lifted by the cage lowering support device, so that the steel cage can slide into the inclined pile hole in a direction parallel to the axis of the inclined pile hole. On the one hand, the head end of the steel cage will not touch the wall of the inclined pile hole when it is lowered, and on the other hand, the steel cage can remain coaxial with the inclined pile hole after it is in place. This can effectively avoid the wall scraping phenomenon caused by lowering the steel cage in the inclined pile hole, and can also ensure that the steel cage can remain coaxial with the formed concrete pile body, so as to ensure the compressive and shear resistance of the inclined pile after forming, and can achieve one-time pile formation, thereby improving the construction quality and efficiency of the inclined pile and greatly reducing energy waste.

[0014] Optionally, the guide device is configured as an arc-shaped plate that fits against the wall of the inclined pile hole, and the end of the arc-shaped plate close to the bottom of the inclined pile hole is provided with a raised portion bent toward the steel cage.

[0015] By adopting the above technical solution, when the steel cage slides in the inclined pile hole, the arc plate is attached to the wall of the inclined pile hole, which increases the contact area between the steel cage and the wall of the inclined pile hole, causes less damage to the wall of the inclined pile hole, and also reduces the probability of collapse of the inclined pile hole; the setting of the raised portion further prevents the arc plate from being inserted into the wall of the inclined pile hole when passing through the inclined pile hole, which helps the arc plate to pass smoothly in the inclined pile hole.

[0016] Optionally, the guide device is configured to rotate a roller installed on the circumference of the steel cage, and the roller rotation axis is orthogonal to the axis of the steel cage.

[0017] By adopting the above technical solution, the setting of the roller improves the smoothness of the sliding of the steel cage in the inclined pile hole, which helps to improve the efficiency of lowering the steel cage.

[0018] Optionally, the lower cage supporting device in step S4 includes a base frame, a flip frame flip-mounted on the base frame, a flip driving member for driving the flip frame to flip on the base frame, and a guide frame slidably arranged on the flip frame and used to support the steel cage, the sliding direction of the guide frame on the flip frame is orthogonal to the flip axis of the flip frame on the base frame, and the flip frame is provided with an anti-slip structure for preventing the guide frame from slipping off the flip frame.

[0019] By adopting the above technical solution, before lowering the cage, the base frame is first transferred to the vicinity of the inclined pile hole, and the flip frame is driven by the flip driving member to flip on the base frame to the same inclination angle as the inclined pile hole, and then the guide frame is slid to insert it into the opening of the inclined pile hole, and then the steel cage is lifted and placed on the guide frame. After the head end of the steel cage slides into the inclined pile hole, the base frame is moved so that the steel cage remains coaxial with the inclined pile hole under the support of the guide frame. At this time, the steel cage is slowly lowered, so that the steel cage can slide smoothly into the inclined pile hole along the extension direction of the inclined pile hole under the dual guiding action of the guide device and the guide frame, which can effectively avoid the phenomenon of scraping the wall and not being coaxial with the inclined pile hole during the lowering of the steel cage, and also significantly improves the lowering efficiency of the steel cage.

[0020] Optionally, the guide device includes a support frame installed on the base frame, a pulley is installed on the end of the support frame away from the base frame, a winch is installed on the base frame, a lifting rope is wound on the winch, the free end of the lifting rope passes around the pulley and is connected to the inner wall of the head end of the steel cage, the connection part between the lifting rope and the steel cage is close to the upper inclined wall of the inclined pile hole, and the support frame is provided with a calibration mechanism for making the lifting rope passing through the steel cage parallel to the extension direction of the inclined pile hole.

[0021] By adopting the above technical solution, the free end of the lifting rope is connected to the inner wall of the head end of the steel cage before the cage is lowered. When preparing to lower the steel cage, the lifting rope is tightened by the winch. At this time, the head end of the steel cage is supported by the lifting rope and the tail end is supported by the guide frame. The lifting rope is adjusted by the calibration mechanism so that the lowering direction of the lifting rope remains parallel to the extension direction of the inclined pile hole. This allows the steel cage to always remain coaxial with the inclined pile hole during lowering. On the one hand, it can keep the steel cage coaxial with the formed inclined pile body, ensuring the bearing capacity of the inclined pile. On the other hand, because the steel cage always remains coaxial with the inclined pile hole during lowering, the cage lowering efficiency is significantly improved. In addition, a gap is necessarily reserved between the steel cage and the inclined pile hole wall. Therefore, no part of the steel cage will contact the inclined pile hole wall during the cage lowering process, which greatly ensures the integrity of the inclined pile hole and avoids the phenomenon of additional sediment at the bottom of the hole after cleaning due to some sediment and floating soil scraped off by the steel cage during lowering.

[0022] Optionally, the calibration mechanism includes a calibration wheel mounted on the support frame and a drive assembly for driving the calibration wheel to move toward / away from the support frame, the calibration wheel is located below the pulley and the suspension rope passes through the pulley and the calibration wheel in a cross manner.

[0023] By adopting the above technical solution, the lifting rope passes through the pulley and then around the calibration wheel close to the support frame, so that the inclination angle of the lifting rope can be changed. Even if inclined piles with different inclination angles are constructed, it is only necessary to adaptively change the distance between the calibration wheel and the support frame to achieve the effect of stably lowering the steel cage. The application scenarios are more comprehensive and more economical.

[0024] Optionally, a lifting ring is installed on the inner wall of the upper inclined wall of the inclined pile hole near the end of the steel bar cage, and a remote unhooking mechanism for hooking / unhooking the lifting ring is installed on the free end of the lifting rope.

[0025] By adopting the above technical solution, after the lifting rope slowly lowers the steel cage to the bottom of the inclined pile hole, the connection between the lifting rope and the lifting ring on the steel cage can be released through the remote unhooking mechanism, so that the lifting rope can be recycled and reused during the inclined pile construction process, avoiding waste of lifting rope and increasing construction costs.

[0026] Optionally, the remote unhooking mechanism includes a hook seat fixed to the free end of the lifting rope, a hook and an unhooking fork being hingedly connected to the hook seat, a fork of the unhooking fork facing the outer bottom surface of the hook, and a fork portion of the unhooking fork away from the hook opening sweeping across the inner hook surface along the swinging trajectory of the unhooking fork;

[0027] A control rope is connected to the fork portion of the unhooking fork close to the hook opening, and the control rope extends to the support frame at one end away from the unhooking fork.

[0028] By adopting the above technical solution, after the lifting rope lowers the steel cage to the bottom of the inclined pile hole, the lifting rope is slightly loosened, and the control rope is pulled on the ground, so that the control rope drives the unhooking fork to flip on the hook seat toward the hook opening. In this process, the fork part of the unhooking fork away from the hook opening pushes the lifting ring from the inner hook surface of the hook to pass through the hook opening, so that the hook is disconnected from the lifting ring. At this time, the winch is reeling in the lifting rope, and the lifting rope and the remote unhooking mechanism can be recovered, thereby realizing the remote unhooking effect of the hook on the lifting ring, and the operation is more convenient.

[0029] Optionally, the hook and the unhooking fork share a hinge shaft on the hook seat, and a torsion elastic member is provided on the hinge shaft, one end of the torsion elastic member is connected to the hook seat or the hook, and the other end is connected to the unhooking fork;

[0030] When the fork portion of the unhooking fork closes the hook opening, the torsion elastic member is in a natural state.

[0031] By adopting the above technical solution, when performing the unhooking operation, the unhooking fork flips toward the direction close to the hook opening, and the torsional elastic member is twisted and deformed; and when the force applied to the control rope stops, the torsional deformation force of the torsional elastic member drives the unhooking fork to flip and reset on the hook seat to close the opening of the hook. On the one hand, it can avoid the situation where the hook opening is in an open state and is easily hooked on the steel cage during the process of winding the rope by the winch, resulting in the inability to smoothly recover the rope. On the other hand, it can also enable the unhooking fork to play a certain degree of protective role on the lifting ring on the inner hook surface of the hook in the absence of external force.

[0032] Optionally, before the steel cage is lowered in step S4, a plurality of guide ribs are welded inside the steel cage along its length direction, and the plurality of guide ribs are arranged in a cylindrical shape to form a guide channel for the conduit to pass through in step S5, and the outer rings of the plurality of guide ribs are welded together with a plurality of reinforcing ring ribs spaced apart along their length direction.

[0033] By adopting the above technical solution, after the multiple guide bars are reinforced and fixed inside the steel cage by the reinforcing ring bars, it is convenient to slide and lift the conduit between the multiple guide bars when pouring concrete, thereby improving the pouring efficiency.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. When lowering the steel cage into the inclined pile hole, the head end of the steel cage is positioned by the guide device and the tail end is lifted by the cage lowering support device, so that the steel cage can slide into the inclined pile hole in a direction parallel to the axis of the inclined pile hole. On the one hand, the head end of the steel cage will not touch the wall of the inclined pile hole when lowering it. On the other hand, the steel cage can maintain a coaxial state with the inclined pile hole after it is in place. This can effectively avoid the wall scraping phenomenon caused by lowering the steel cage into the inclined pile hole, and can also ensure that the steel cage can maintain a coaxial state with the formed concrete pile body, thereby ensuring the compression and shear resistance of the inclined pile after forming, and can achieve one-time pile formation, thereby improving the construction quality and efficiency of the inclined pile and greatly reducing energy waste.

[0036] 2. Before lowering the cage, connect the free end of the lifting rope to the inner wall of the head end of the steel cage, and adjust the lifting rope through the calibration mechanism, so that the steel cage can always remain coaxial with the inclined pile hole when it is lowered into the inclined pile hole. On the one hand, it can keep the steel cage coaxial with the formed inclined pile body, ensuring the bearing capacity of the inclined pile; on the other hand, because the steel cage always remains coaxial with the inclined pile hole when it is lowered into the inclined pile hole, the cage lowering efficiency is significantly improved. In addition, a gap must be reserved between the steel cage and the inclined pile hole wall, so that no part of the steel cage will come into contact with the inclined pile hole wall during the cage lowering process, which greatly ensures the integrity of the inclined pile hole and avoids the phenomenon of additional sediment at the bottom of the hole after cleaning due to some sediment and floating soil scraped off when the steel cage is lowered.

[0037] 3. After the lifting rope slowly lowers the steel cage to the bottom of the inclined pile hole, the connection between the lifting rope and the lifting ring on the steel cage can be released through the remote unhooking mechanism, so that the lifting rope can be recycled and reused during the inclined pile construction process, avoiding the waste of lifting rope and the increase of construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0039] Figure 2 It is a structural diagram of the steel cage and guide device in Example 1 of the present application.

[0040] Figure 3 yes Figure 1 Enlarged schematic diagram of part A.

[0041] Figure 4 It is a structural schematic diagram of the steel cage and guide device in Example 2 of the present application.

[0042] Figure 5 It is a schematic diagram of the overall structure of Example 3 of the present application.

[0043] Figure 6 yes Figure 5 Schematic diagram of the enlarged portion B.

[0044] Figure 7 It is a structural diagram of the steel cage and guide device in Example 3 of the present application.

[0045] Figure 8 It is a structural diagram of the remote decoupling mechanism in Example 3 of the present application.

[0046] Reference numerals: 1, oblique pile hole;

[0047] 2. Steel cage; 21. Lifting ring; 22. Guide ribs; 23. Guide channel; 24. Reinforcement ring ribs;

[0048] 31. curved plate; 311. raised portion; 32. roller;

[0049] 41. Base frame; 42. Turning frame; 43. Turning drive member; 44. Guide frame; 45. Anti-slip structure; 46. Support arm;

[0050] 51. Support frame; 52. Pulley; 53. Winch; 54. Lifting rope;

[0051] 61. Calibration wheel; 62. Drive assembly; 621. Calibration seat; 622. Guide rod; 623. Threaded rod; 624. Mounting seat; 625. Drive cylinder; 626. Servo motor;

[0052] 71. Hook seat; 72. Hook; 73. Unhooking fork; 74. Control rope; 75. Torsion elastic member; 76. Winding roller; 77. Winding motor. DETAILED DESCRIPTION

[0053] The following is combined with Figure 1-8 This application is described in further detail.

[0054] Example 1:

[0055] The present application discloses a method for constructing foundation pit inclined piles. Figure 1 and Figure 2 A foundation pit inclined pile construction method comprises the following steps:

[0056] S1. Construction preparation: level the site, set up piles in the periphery of the foundation pit to be excavated, and calculate the pile diameter, length, and inclination angle;

[0057] S2. Get soil and drill, drill a hole at the pile position to a set depth at a set tilt angle to form an inclined pile hole 1;

[0058] S3. Hole cleaning and hole inspection: Use a hole cleaning drill to clean the hole and inspect the hole quality;

[0059] S4. Install the lower reinforcement cage 2. First, weld multiple guide ribs 22 along its length within the cage 2. These ribs 22 form a cylindrical guide channel 23. Multiple reinforcement ring ribs 24 are welded to the outer rings of the ribs 22, spaced along their length. A guide device is then installed on the cage 2 to maintain the cage's head end coaxial with the pile hole 1. A lower cage support device is then installed at the opening of the pile hole 1 to allow the cage 2 to slide into the pile hole 1 parallel to its axis.

[0060] S5. Lower the pipe and grout. Lower the pipe into the guide channel 23 on the steel cage 2 and pour concrete into the inclined pile hole 1. Pull out the pipe while pouring concrete.

[0061] The guide device is configured as a curved plate 31 mounted at the head end of the steel cage 2 and aligned with the wall of the inclined pile hole 1. The end of the curved plate 31, near the bottom of the inclined pile hole 1, is provided with a raised portion 311 that curves toward the steel cage 2. The curved plate 31 can be mounted on the side of the steel cage 2 near the lower inclined wall of the inclined pile hole 1, or on the side of the steel cage 2 near the upper inclined wall of the inclined pile hole 1, or multiple curved plates 31 can be installed around the steel cage 2. In this embodiment, the curved plate 31 is mounted on the side of the steel cage 2 near the lower inclined wall of the inclined pile hole 1.

[0062] After such arrangement, when the steel cage 2 is lowered into the inclined pile hole 1, the curved plate 31 at the head end of the steel cage 2 adheres to the wall of the inclined pile hole 1, and the tail end is lifted by the lower cage support device. The arrangement of the curved plate 31 increases the contact area between the steel cage 2 and the wall of the inclined pile hole 1, causing less damage to the wall of the inclined pile hole 1, and also reduces the probability of collapse of the inclined pile hole 1. Thus, on the one hand, the head end of the steel cage 2 will not touch the wall of the inclined pile hole 1 when lowered, causing the steel cage 2 to scrape the wall. On the other hand, the steel cage 2 can also remain coaxial with the inclined pile hole 1 after being lowered into place. This ensures the compressive and shear resistance of the inclined pile after forming, enables pile formation in one go, improves the construction quality and efficiency of the inclined pile, and greatly reduces the waste of energy caused by low construction efficiency and uncontrollable quality.

[0063] In specific implementation, refer to Figure 1 and Figure 3 The lower cage support device in step S4 includes a base frame 41, a flip frame 42 flip-mounted on the base frame 41, a flip driving member 43 for driving the flip frame 42 to flip on the base frame 41, and a guide frame 44 slidably mounted on the flip frame 42 and used to support the steel cage 2. The guide frame 44 can be flat or have a concave arc shape on the upper end surface. The sliding direction of the guide frame 44 on the flip frame 42 is orthogonal to the flip axis of the flip frame 42 on the base frame 41. The flip frame 42 is provided with an anti-slip structure 45 for preventing the guide frame 44 from slipping off the flip frame 42. Specifically, the flip driving member 43 is configured as a hydraulic cylinder whose cylinder body is hinged to the bottom of the base frame 41, and the piston rod of the hydraulic cylinder is hinged to the bottom surface of the flip frame 42; and the anti-slip structure 45 is configured as an anti-slip block fixed to the end of the guide frame 44. When the flip frame 42 is tilted downward, the guide frame 44 slides on the flip frame 42 until the anti-slip block abuts against the tilted end of the flip frame 42.

[0064] After the cage is lowered, the base frame 41 is first transferred to the vicinity of the inclined pile hole 1, and the turning frame 42 is driven by the turning driving member 43 to turn on the base frame 41 to the same inclination angle as the inclined pile hole 1, and then the guide frame 44 is slid to insert it into the opening of the inclined pile hole 1, and then the steel cage 2 is lifted and the steel cage 2 is placed on the guide frame 44. After the head end of the steel cage 2 slides into the inclined pile hole 1, the base frame 41 is moved so that the steel cage 2 remains coaxial with the inclined pile hole 1 under the support of the guide frame 44. At this time, the steel cage 2 is slowly lowered, so that the steel cage 2 can slide smoothly into the inclined pile hole 1 along the extension direction of the inclined pile hole 1 under the dual guiding action of the guide device and the guide frame 44, which can effectively avoid the wall scraping and the phenomenon of not being coaxial with the inclined pile hole 1 during the lowering process of the steel cage 2, and also significantly improve the lowering efficiency of the steel cage 2.

[0065] In order to improve the portability during construction, especially the construction efficiency during multi-pile construction, refer to Figure 1 Wheels are mounted below the chassis 41, or the chassis 41 is configured as a wheel chassis, or as a crawler chassis. In the present embodiment, the chassis 41 is configured as a crawler chassis to facilitate movement on muddy construction sites. Two support arms 46 are hingedly connected to the side of the chassis 41 near the turning frame 42 to balance the chassis 41 and prevent it from tipping over when the guide frame 44 supports the steel cage 2. Alternatively, a counterweight can be added to the side of the chassis 41 away from the turning frame 42.

[0066] The implementation principle of a foundation pit inclined pile construction method in an embodiment of the present application is as follows: when the steel cage 2 is lowered into the inclined pile hole 1, the arc-shaped plate 31 at the head end of the steel cage 2 is attached to the wall of the inclined pile hole 1, and the tail end is lifted by the lower cage support device. The setting of the arc-shaped plate 31 can, on the one hand, prevent the head end of the steel cage 2 from touching the wall of the inclined pile hole 1 when being lowered, causing the steel cage 2 to scrape the wall; on the other hand, it can also enable the steel cage 2 to maintain a coaxial state with the inclined pile hole 1 after being lowered into place, thereby ensuring the compressive and shear resistance of the inclined pile after forming, achieving one-time pile formation, improving the construction quality and efficiency of the inclined pile, and greatly reducing the waste of energy caused by low construction efficiency and uncontrollable quality.

[0067] Example 2:

[0068] The present application discloses a method for constructing foundation pit inclined piles, referring to Figure 4, which is different from Example 1 in that: the guide device is configured to rotate a roller 32 mounted on the side of the steel cage 2, and a plurality of rollers 32 are provided, and the rotation axis of the roller 32 is orthogonal to the axis of the steel cage 2. The roller 32 can be mounted on the side of the steel cage 2 close to the lower inclined hole wall of the inclined pile hole 1, or it can be mounted on the side of the steel cage 2 close to the upper inclined hole wall of the inclined pile hole 1, or a plurality of rollers 32 can be provided on the side of the steel cage 2. In the embodiment of the present application, the roller 32 is mounted on the side of the steel cage 2 close to the lower inclined hole wall of the inclined pile hole 1. In this way, by providing the roller 32, the smoothness of the sliding of the steel cage 2 in the inclined pile hole 1 is improved, which helps to improve the cage lowering efficiency of the steel cage 2.

[0069] Example 3:

[0070] The present application discloses a method for constructing foundation pit inclined piles, referring to Figure 5 , which is different from Example 1 or Example 2 in that: the guide device includes a support frame 51 installed on the base frame 41, and a pulley 52 is installed at the end of the support frame 51 away from the base frame 41. A winch 53 is also installed on the base frame 41, and a lifting rope 54 is wound on the winch 53. The free end of the lifting rope 54 passes around the pulley 52 and is connected to the inner wall of the head end of the steel cage 2. The connection between the lifting rope 54 and the steel cage 2 is close to the upper inclined wall of the inclined pile hole 1. The support frame 51 is provided with a calibration mechanism for making the lifting rope 54 passing through the steel cage 2 parallel to the extension direction of the inclined pile hole 1.

[0071] In this way, before lowering the cage, the free end of the lifting rope 54 is connected to the inner wall of the head end of the reinforcement cage 2, the lifting rope 54 is tightened by the winch 53, and the lifting rope 54 is adjusted by the calibration mechanism, so that the lowering direction of the lifting rope 54 can be kept parallel to the extending direction of the inclined pile hole 1. In this way, the reinforcement cage 2 can always remain in a coaxial state with the inclined pile hole 1 when being lowered in the inclined pile hole 1. On the one hand, the reinforcement cage 2 can remain coaxial with the formed inclined pile body, ensuring the bearing performance of the inclined pile; on the other hand, since the reinforcement cage 2 always remains coaxial with the inclined pile hole 1 when being lowered in the inclined pile hole 1, the wall scraping phenomenon when the reinforcement cage 2 is lowered will not occur, which significantly improves the cage lowering efficiency. In addition, a gap must be reserved between the steel cage 2 and the wall of the inclined pile hole 1. In this way, no part of the steel cage 2 will contact the wall of the inclined pile hole 1 during the cage lowering process, which greatly ensures the integrity of the inclined pile hole 1 and avoids the occurrence of new sediment at the bottom of the hole due to scraping off some sediment and floating soil when the steel cage 2 is lowered after cleaning the hole.

[0072] When implementing it, refer to Figure 5 and Figure 6The calibration mechanism includes a calibration wheel 61 mounted on the support frame 51 and a drive assembly for driving the calibration wheel 61 toward or away from the support frame 51. The calibration wheel 61 is located below the pulley 52, and the suspension rope 54 passes through the pulley 52 and the calibration wheel 61 in a cross-shaped manner. The drive assembly includes a calibration seat 621 fixed to the base frame 41 or the support frame 51. The calibration seat 621 is provided with a parallel guide rod 622 and a threaded rod 623. The ends of the guide rod 622 and the threaded rod 623 away from the support frame 51 are jointly fixed to a mounting seat 624. The calibration wheel 61 is rotatably mounted on the side of the mounting seat 624 away from the support frame 51. The mounting seat 624 is rotatably provided with a drive cylinder 625 threadedly sleeved on the threaded rod 623. A servo motor 626 is provided on the base frame 41. The output end of the servo motor 626 is connected to the drive cylinder 625 via a chain transmission.

[0073] Therefore, the lifting rope 54 passes through the pulley 52, bypasses the calibration wheel 61, and is connected to the steel cage 2 near the side of the support frame 51, so that the inclination angle of the lifting rope 54 can be changed; when inclined piles with different inclination angles are constructed, the servo motor 626 can be started. When the servo motor 626 drives the driving cylinder 625 to rotate, the threaded rod 623 can be made to reciprocate in the horizontal direction, thereby changing the distance between the calibration wheel 61 and the calibration seat 621, so that the inclination direction of the lifting rope 54 is changed, thereby effectively adjusting the lowering angle of the steel cage 2, facilitating the contactless lowering of the steel cage 2 and the wall of the inclined pile hole 1; at the same time, it also makes the application scenarios of this application more comprehensive and more economical.

[0074] After the lifting rope 54 is used to lift the steel cage 2 and lower it to the bottom of the inclined pile hole 1, the lifting rope 54 cannot be separated from the steel cage 2. At this time, the lifting rope 54 needs to be cut off to facilitate the transfer of the base frame 41 to another pile position for construction, which will also cause a waste of resources.

[0075] Based on the above considerations, in another feasible embodiment, referring to Figure 7 and Figure 8A lifting ring 21 is installed on the inner wall of the upper inclined wall of the inclined pile hole 1 near the head end of the steel cage 2. The lifting ring 21 is rotatably connected to the steel cage 2, and its rotation axis is orthogonal to the axis of the steel cage 2. At the same time, a remote unhooking mechanism for hooking / unhooking the lifting ring 21 is installed on the free end of the lifting rope 54. The remote unhooking mechanism includes a hook seat 71 fixed to the free end of the lifting rope 54. A hook 72 and a unhooking fork 73 are hinged on the hook seat 71. The unhooking fork 73 is "U"-shaped and its closed end is hinged to the hook seat 71. The fork direction of the unhooking fork 73 faces the outer bottom surface of the hook 72. The fork portion of the unhooking fork 73 away from the opening of the hook 72 sweeps across the inner hook surface of the hook 72 along the swing trajectory of the unhooking fork 73. In addition, a control rope 74 is connected to the fork portion of the unhooking fork 73 near the opening of the hook 72. The end of the control rope 74 away from the unhooking fork 73 extends to the support frame 51.

[0076] More specifically, see Figure 6 The aforementioned calibration wheel 61 is a double-grooved concave wheel, and the lifting rope 54 and the control rope 74 are respectively embedded in the two grooves of the double-grooved concave wheel, and a winding roller 76 and a winding motor 77 for driving the winding roller 76 to rotate are also rotatably provided on the support frame 51. The end of the control rope 74 away from the hook seat 71 is wound around the winding roller 76.

[0077] When the hook 72 is unlocked, the hoist 53 is rotated to unlock the hook 72, and the hoist 53 is rotated to unlock the hook 72. When the hook 72 is unlocked, the hoist 53 is rotated to unlock the hook 72, and the hoist 53 is rotated to unlock the hook 72.

[0078] In order to prevent the steel cage 2 from being unable to maintain a coaxial state with the inclined pile hole 1 after the suspension rope 54 is unhooked from the steel cage 2, it is further required to define: Figure 7 The lifting ring 21 is installed at a certain distance from the head end of the steel cage 2, so that after the lifting rope 54 lifts the steel cage 2 into place, concrete is poured at the bottom of the inclined pile hole 1 first, and then the lifting rope 54 and the remote unhooking mechanism are recovered after the concrete is initially set and the head end of the steel cage 2 is fixed.

[0079] Alternatively, in other feasible embodiments, the head end of the steel cage 2 is also installed with an arc plate 31 or roller 32 as in Example 1 or Example 2, so there is no need to limit the installation position of the lifting ring 21, that is, there is no need to wait until part of the concrete has initially set before removing the lifting rope 54, which can improve the construction efficiency of the inclined pile.

[0080] At the same time, in order to further improve the portability of the remote uncoupling mechanism during use, refer to Figure 8 The hook 72 and the unhooking fork 73 are hinged on a common axis on the hook seat 71, and a torsional elastic member 75 is provided on the hinge axis. The torsional elastic member 75 is configured as a torsion spring. The torsional elastic member 75 is sleeved on the hinge axis and one end is connected to the hook seat 71 or the hook 72, and the other end is connected to the unhooking fork 73. In this embodiment, the end of the torsional elastic member 75 away from the unhooking fork 73 is connected to the hook seat 71; and when the fork portion of the unhooking fork 73 closes the opening of the hook 72 closes the opening of the hook 72, the torsional elastic member 75 is in a natural state.

[0081] When the lifting rope 54 is in the process of being wound, the unhooking fork 73 is in the state of being opened, and the lifting rope 54 is in the state of being wound. When the lifting rope 54 is in the state of being wound, the lifting rope 54 is in the state of being wound. When the lifting rope 54 is in the state of being wound, the lifting rope 54 is in the state of being wound. When the lifting rope 54 is in the state of being wound, the lifting rope 54 is in the state of being wound. When the lifting rope 54 is in the state of being wound, the lifting rope 54 is in the state of being wound. When the lifting rope 54 is in the state of being wound, the lifting rope 54 is in the state of being wound, and the lifting rope 54 is in the state of being wound. When the lifting rope 54 is in the state of being wound, the lifting rope 54 is in the state of being wound, and the lifting rope 54 is in the state of being wound, ...73 is in the state of being wound, and the lifting rope 54 is in the state of being wound. When the lifting rope 54 is in the state of being wound, the lifting rope 54 is in the state of being wound, and the lifting rope 54 is in the state of being wound, the lifting rope 54 is in the state of being wound, and the lifting rope 54 is in the state of being wound

[0082] The implementation principle of a foundation pit inclined pile construction method in an embodiment of the present application is as follows: before lowering the cage, the hook 72 at the free end of the lifting rope 54 is hooked on the lifting ring 21 connected to the head end of the steel cage 2, the lifting rope 54 is tightened by the winch 53, and the inclination angle of the lifting rope 54 is adjusted by adjusting the position of the calibration wheel 61, so that the lowering direction of the lifting rope 54 can be kept parallel to the extension direction of the inclined pile hole 1. In this way, the steel cage 2 can always remain coaxial with the inclined pile hole 1 when being lowered in the inclined pile hole 1. On the one hand, the steel cage 2 can remain coaxial with the formed inclined pile body, ensuring the bearing capacity of the inclined pile; on the other hand, since the steel cage 2 always remains coaxial with the inclined pile hole 1 when being lowered in the inclined pile hole 1, the wall scraping phenomenon when the steel cage 2 is lowered will not occur, which significantly improves the cage lowering efficiency. In addition, a gap must be reserved between the steel cage 2 and the wall of the inclined pile hole 1. In this way, no part of the steel cage 2 will contact the wall of the inclined pile hole 1 during the cage lowering process, which greatly ensures the integrity of the inclined pile hole 1 and avoids the occurrence of new sediment at the bottom of the hole due to scraping off some sediment and floating soil when the steel cage 2 is lowered after cleaning the hole.

[0083] After the steel cage 2 is lowered, the winding motor 77 can be started to make the winding roller 76 reel in the control rope 74, and the unhooking fork 73 can be used to remove the lifting ring 21 from the opening of the hook 72, so that the hook 72 and the steel cage 2 are unhooked, so that the lifting rope 54 and the hook 72 can be recovered for the next construction, and the waste of the lifting rope 54 and the increase in construction costs can be avoided.

[0084] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A foundation pit inclined pile construction method, characterized by: The following steps are involved: S1. Construction preparation: level the site, set up piles in the periphery of the foundation pit to be excavated, and calculate the pile diameter, length, and inclination angle; S2. soil drilling, drilling at the pile position according to the set inclination angle to the set depth to form an inclined pile hole (1); S3. Hole cleaning and hole inspection: Use a hole cleaning drill to clean the hole and inspect the hole quality; S4. A lower steel cage (2), wherein a guide device is provided on the steel cage (2) for keeping the head end of the steel cage (2) in a coaxial state with the inclined pile hole (1); a lower cage support device is provided at the opening of the inclined pile hole (1) so that the steel cage (2) slides into the inclined pile hole (1) in a direction parallel to the axis of the inclined pile hole (1); the lower cage support device comprises a base frame (41); the guide device comprises a support frame (51) mounted on the base frame (41), a pulley (52) is mounted on one end of the support frame (51) away from the base frame (41), a winch (53) is mounted on the base frame (41), and a hoisting rope (54) is wound around the winch (53); the support The frame (51) is provided with a calibration mechanism for making the suspension rope (54) passing through the steel cage (2) parallel to the extension direction of the inclined pile hole (1); the calibration mechanism includes a calibration wheel (61) installed on the support frame (51) and a drive assembly for driving the calibration wheel (61) to move toward / away from the support frame (51); the drive assembly includes a calibration seat (621) fixedly connected to the base frame (41) or the support frame (51), and the calibration seat (621) is provided with a parallel guide rod (622) and a threaded rod (623), and the ends of the guide rod (622) and the threaded rod (623) away from the support frame (51) are fixedly connected to the mounting seat (621). 4), the calibration wheel (61) is rotatably arranged on a side of the mounting seat (624) away from the support frame (51); a driving cylinder (625) threadedly sleeved on the threaded rod (623) is rotatably arranged on the mounting seat (624), and a servo motor (626) is arranged on the base frame (41), and the output end of the servo motor (626) is connected to the driving cylinder (625) through a chain transmission; a lifting ring (21) is installed on the inner wall of the upper inclined wall of the inclined pile hole (1) at the head end of the steel cage (2), and a remote unhooking mechanism for hooking / unhooking the lifting ring (21) is installed at the free end of the lifting rope (54); the remote unhooking mechanism includes a hook seat (7) fixedly connected to the free end of the lifting rope (54) 1), a hook (72) and a decoupling fork (73) are hinged on the hook seat (71), the fork direction of the decoupling fork (73) faces the outer bottom surface of the hook (72), and the fork portion of the decoupling fork (73) away from the opening of the hook (72) sweeps across the inner hook surface of the hook (72) along the trajectory of the swing of the decoupling fork (73); a control rope (74) is connected to the fork portion of the decoupling fork (73) close to the opening of the hook (72), and one end of the control rope (74) away from the decoupling fork (73) extends to the support frame (51); the hook (72) and the decoupling fork (73) are hinged on a common axis on the hook seat (71), and a torsional elastic member (75) is provided on the hinge axis; S5. Lowering the pipe and grouting: lowering the pipe into the steel cage (2) and pouring concrete into the inclined pile hole (1).

2. A foundation pit inclined pile construction method according to claim 1, characterized in that: The guide device is provided as an arc-shaped plate (31) that fits against the wall of the inclined pile hole (1); an end of the arc-shaped plate (31) close to the bottom of the inclined pile hole (1) is provided with a raised portion (311) that bends toward the steel cage (2).

3. The method for constructing inclined foundation pit piles according to claim 1, characterized in that: The guide device is configured to rotatably mount a roller (32) on the circumference of the steel cage (2), wherein the rotation axis of the roller (32) is orthogonal to the axis of the steel cage (2).

4. A foundation pit inclined pile construction method according to any one of claims 1 to 3, characterized in that: The lower cage supporting device in step S4 includes a turning frame (42) turned over on the base frame (41), a turning driving member (43) for driving the turning frame (42) to turn over on the base frame (41), and a guide frame (44) slidably arranged on the turning frame (42) and used to support the steel cage (2), wherein the sliding direction of the guide frame (44) on the turning frame (42) is orthogonal to the turning axis of the turning frame (42) on the base frame (41), and the turning frame (42) is provided with an anti-slip structure (45) for preventing the guide frame (44) from sliding off the turning frame (42).

5. The method for constructing inclined foundation pit piles according to claim 1, characterized in that: The free end of the suspension rope (54) passes around the pulley (52) and is connected to the inner side wall of the head end of the reinforcement cage (2). The connection between the suspension rope (54) and the reinforcement cage (2) is close to the upper inclined wall of the inclined pile hole (1).

6. The method for constructing inclined foundation pit piles according to claim 1, characterized in that: The calibration wheel (61) is located below the pulley (52) and the suspension rope (54) passes through the pulley (52) and the calibration wheel (61) in a cross manner.

7. The method for constructing inclined foundation pit piles according to claim 1, characterized in that: One end of the torsion elastic member (75) is connected to the hook seat (71) or the hook (72), and the other end is connected to the unhooking fork (73); When the fork portion of the unhooking fork (73) closes the opening of the hook (72) on one side of the opening, the torsion elastic member (75) is in a natural state.

8. The method for constructing inclined foundation pit piles according to claim 4, characterized in that: Before the steel cage (2) is lowered in step S4, a plurality of guide ribs (22) are welded inside the steel cage (2) along its length direction, the plurality of guide ribs (22) are surrounded in a cylindrical shape to form a guide channel (23) for the conduit to pass through in step S5, and the outer rings of the plurality of guide ribs (22) are welded with a plurality of reinforcing ring ribs (24) spaced apart along their length direction.

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