A cast-in-place pile steel casing positioning device

Abstract

The utility model relates to the technical field of pile foundation construction operation equipment, concretely is a cast -in -place pile steel casing positioning device, the device includes the base plate of middle part opening positioning hole, a plurality of positioning rods are slidably connected on the base plate, the positioning rods are arranged along the circumferential direction of positioning hole, the driving assembly for driving the positioning rod moves along the radial direction of positioning hole is provided on the base plate, the end of positioning rod all can detachable connection vertical plate, a plurality of guide wheels are rotatably connected on the inner wall of vertical plate, the device need not to disassemble, only rotate operating lever can drive the radial synchronous movement of positioning rod, quickly adapt to different diameter steel casing, avoid the complicated process and precision error of traditional screw adjustment, and the universality greatly promotes, driving assembly will annular rotation convert into the accurate radial movement of positioning rod, cooperate the limiting groove limit rotation range, positioning screw locking ring plate, avoid the deviation caused by artificial error and external force, guarantee the positioning accuracy and construction stability.

Description

Technical Field

[0001] This utility model relates to the technical field of pile foundation construction equipment, specifically a positioning device for cast-in-place pile steel casing. Background Technology

[0002] A steel casing is a steel pipe structure used to protect the borehole opening of a bored pile. It is usually made of welded steel plates and used in conjunction with a rotary drilling rig. Its main function is to prevent soil collapse around the borehole opening and to prevent debris from entering the hole. It also improves the safety and quality of pile foundation construction. In addition to preventing debris and soil from entering the pile hole, the steel casing can also act as a guide, helping the drill bit to drill smoothly into the hole.

[0003] In pile foundation (cast-in-place pile) construction, the positioning of the steel casing is a core preliminary step. Positioning deviations directly impact subsequent processes, triggering a chain of quality problems. Its accuracy and stability directly determine the quality of the entire process, including drilling, reinforcement cage installation, and concrete pouring, and can even affect the pile foundation's bearing capacity and the safety of the engineering structure. Traditional casing installation relies on manual labor, with adjustments to the casing's position and verticality typically made through subjective observation. Inaccurate positioning on the first attempt requires multiple adjustments and checks to achieve accurate positioning, resulting in slow construction speed, low efficiency, and significant errors in verticality determined by manual observation, thus affecting the verticality and pile quality of the bored pile.

[0004] Chinese patent CN202321286183.9 discloses "A Steel Casing Positioning and Guiding Mechanism" (publication number CN219753231U). The device includes a support bracket and a load-bearing bracket. The support bracket has an assembly groove through its side, an installation side groove at one end, and an installation support fixedly installed at the other end. The load-bearing bracket has mating side blocks fixedly installed on both sides. The load-bearing bracket is fixedly installed on the side of the support bracket through the mating side blocks and the installation side groove. An installation sleeve block is fixedly installed on one side of the load-bearing bracket. An assembly groove is through its inner side. A threaded bracket is installed inside the assembly groove, and an assembly bushing is fixedly sleeved on the outer side of the threaded bracket. However, this device has some drawbacks: it needs to be disassembled and reassembled to adapt to steel casings of different diameters. The device needs to be disassembled first, and then rotated sequentially through the threaded clamps and threaded supports to adjust the position of the load-bearing support in order to adapt to steel casings of different diameters. First of all, there are many threaded clamps and threaded supports, and adjusting them sequentially involves many steps. Moreover, the thread adjustment is "step-by-step," making it difficult to simultaneously grasp the exact amount of adjustment of the threaded clamps. It needs to be used in conjunction with calipers, making the operation cumbersome and inefficient. Utility Model Content

[0005] To address the problems of the prior art, this utility model provides a positioning device for cast-in-place pile steel casing, which can adapt to steel casings of different diameters within a certain range without requiring disassembly and reassembly.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a positioning device for a cast-in-place pile steel casing, comprising a base plate with a positioning hole in the middle, a plurality of positioning rods slidably connected on the base plate, the positioning rods being arranged along the circumferential direction of the positioning hole, a driving assembly for driving the positioning rods to move radially along the positioning hole on the base plate, and a vertical plate being detachably connected to the ends of the positioning rods, with a plurality of guide wheels rotatably connected to the inner wall of the vertical plate.

[0007] With the above structural design, multiple positioning rods that can move radially along the positioning holes can adjust their positions within a certain range according to steel casings of different diameters, thereby achieving positioning of steel casings of different specifications and improving the versatility of the device. The guide wheels rotatably connected to the inner wall of the vertical plate transform sliding friction into rolling friction during the lowering of the steel casing, greatly reducing the friction between the steel casing and the vertical plate, allowing the steel casing to be lowered more smoothly, and also reducing wear on the surface of the steel casing. The positioning rod ends are detachably connected to the vertical plate, which facilitates the installation, replacement, and maintenance of the vertical plate and guide wheels, reducing the cost of use.

[0008] Preferably, the driving assembly includes an annular plate rotatably connected to the base plate, an arc-shaped groove formed on the annular plate, a guide slider slidably connected in the arc-shaped groove, and an operating rod fixedly connected to the annular plate. The tail end of the arc-shaped groove is close to the outer ring of the annular plate, and the head end of the arc-shaped groove is close to the inner ring of the annular plate. The guide slider is fixedly connected to the positioning rod.

[0009] By adopting the above structural design, the rotation of the ring plate is driven by rotating the operating rod. The rotation of the ring plate is converted into the radial movement of the guide slider and the positioning rod by the cooperation of the arc-shaped slide and the guide slider. Compared with some complex drive structures, this method is simple to operate and reduces the difficulty and labor intensity of the operator.

[0010] Preferably, a limiting groove for limiting the rotation angle of the annular plate is formed along the circumferential direction of the annular plate, and a limiting post is slidably arranged in the limiting groove, and the limiting post is fixedly connected to the base plate.

[0011] The above structural design, with its limiting groove and limiting column, clearly defines the rotation angle range of the annular plate, preventing the positioning rod from moving beyond its reasonable range due to excessive rotation of the annular plate. This ensures the accuracy and stability of the steel casing positioning and prevents positioning errors from affecting the construction quality of the cast-in-place pile. This limiting structure also increases the stability of the annular plate during rotation, reduces potential swaying or offset during rotation, makes the operation of the drive components more reliable, and extends the service life of the device.

[0012] Preferably, a card plate is fixed on the substrate, the card plate has a slot that matches the outer edge of the annular plate, and a positioning screw is threaded through the card plate.

[0013] With the above structural design, after the positioning rod is adjusted to the appropriate position by rotating the annular plate with the operating lever, the positioning screw can be tightened to make the clamping plate firmly lock the annular plate, thereby fixing the annular plate and preventing it from rotating due to external forces during subsequent construction, ensuring that the accuracy of the steel casing positioning will not be affected; when it is necessary to adjust the positioning position of the steel casing, the positioning screw can be loosened to rotate the annular plate; after adjustment, the screw is tightened again to fix it, making the operation convenient and quick.

[0014] Preferably, multiple legs are fixedly connected to the base plate, universal wheels are fixedly connected to the bottom end of the legs, a fixing plate is fixedly connected to the legs, an anchor bolt is passed through the fixing plate, and a handwheel is fixed to the upper end of the anchor bolt.

[0015] The aforementioned structural design, with its omnidirectional wheels at the bottom of the outriggers, allows the entire positioning device to be easily moved on the construction site. It can be quickly moved to the pile location where steel casing positioning is required, improving construction convenience and work efficiency. Once the device is in the designated position, rotating the handwheel moves the anchor bolts downwards, bringing them into contact with the ground and applying pressure to firmly fix the device to the ground. This prevents displacement during steel casing positioning and construction, ensuring positioning accuracy and construction safety. Furthermore, this design adapts to different ground conditions, enhancing the device's environmental adaptability.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This device requires no disassembly; simply rotating the operating lever moves the positioning rod radially and synchronously, quickly adapting to steel casings of different diameters. It avoids the cumbersome process and precision errors of traditional threaded adjustments, significantly improving versatility. The drive assembly transforms the circular rotation into precise radial movement of the positioning rod. Combined with the limiting groove to restrict the rotation range and the positioning screw to lock the annular plate, it avoids deviations caused by human error and external forces, ensuring positioning accuracy and construction stability. Guide wheels reduce friction and wear during the lowering of the steel casing, while omnidirectional wheels facilitate device movement. The handwheel controls the rapid fixing of the anchor bolts, reducing operational difficulty and labor intensity, and shortening positioning preparation time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a top view of the structure of this utility model. Detailed Implementation

[0018] Please see Figure 1 , Figure 2This utility model provides a technical solution: a positioning device for a cast-in-place pile steel casing, including a base plate 1 with a positioning hole 11 in the middle, a plurality of positioning rods 2 slidably connected on the base plate 1, a sliding groove arranged radially along the positioning hole 11 on the base plate, the positioning rods 2 slidably connected in the sliding groove, the positioning rods 2 arranged along the circumferential direction of the positioning hole 11, the positioning rods 2 moving along the radial direction of the positioning hole 11, the positioning rods 2 being evenly spaced along the circumferential direction of the positioning hole 11, a driving component for driving the positioning rods 2 to move along the radial direction of the positioning hole 11 provided on the base plate 1, the ends of the positioning rods 2 being detachably connected to a vertical plate 3, a plurality of guide wheels 4 being rotatably connected to the inner wall of the vertical plate 3, the guide wheels 4 being evenly spaced along the length direction of the vertical plate 3.

[0019] The end of the positioning rod 2 is fixedly connected to the support plate 21, and bolts are passed through the support plate 21. Threaded holes matching the bolts are opened on the back of the vertical plate 3.

[0020] The driving assembly includes an annular plate 51 rotatably connected to the base plate 1, an arc-shaped groove 52 formed on the annular plate 51, a guide slider 53 slidably connected within the arc-shaped groove 52, and an operating rod 54 fixedly connected to the annular plate 51. The tail end of the arc-shaped groove 52 is close to the outer ring of the annular plate 51, and the head end of the arc-shaped groove 52 is close to the inner ring of the annular plate 51. The guide slider 53 is fixedly connected to the positioning rod 2 and has a cylindrical structure. The diameter of the inner ring of the annular plate 51 corresponds to the positioning hole 11.

[0021] One end of the operating lever 54 is provided with an external thread. The operating lever 54 is connected to the circumferential wall of the annular plate 51 by the thread. Multiple sets of operating levers 54 are provided and are equally spaced along the circumferential direction of the annular plate 51 so that the workers can work together to push the annular plate 51 to rotate.

[0022] A limiting groove 55 is formed along the circumferential direction of the annular plate 51 to limit the rotation angle of the annular plate 51. The limiting groove 55 has an arc-shaped structure. A limiting post 56 is slidably arranged in the limiting groove 55. The limiting post 56 is fixedly connected to the base plate 1. When the annular plate 51 rotates, one end of the limiting groove 55 moves away from the limiting post 56 (in the initial position, one end of the limiting groove 55 is close to or in contact with the limiting post 56), and the other end of the limiting groove 55 gradually approaches the limiting post 56 until the other end of the limiting groove 55 abuts against the limiting post 56. At this time, the annular plate 51 can no longer rotate. At the same time, the guide slider 53 slides synchronously in the arc-shaped slide groove 52, moving from the first end (or the last end) of the arc-shaped slide groove 52 to the last end (or the first end), completing the maximum radial adjustment stroke of the positioning rod 2, accurately limiting the maximum rotation angle of the annular plate 51, and thus controlling the maximum radial movement distance of the positioning rod 2. This ensures that the adjustment range of the positioning rod 2 is always within the preset steel casing diameter matching range, avoiding the positioning rod 2 from exceeding the effective working range or interfering with other components due to over-adjustment. At the same time, it ensures that the sliding stroke of the guide slider 53 in the arc-shaped slide groove 52 matches the adjustment requirements of the positioning rod 2, achieving safe and accurate positioning adjustment.

[0023] A card plate 7 is fixed on the base plate 1. A slot matching the outer edge of the annular plate 51 is formed on the card plate 7. A positioning screw 71 is threaded through the card plate 7. An anti-slip rubber pad is fixedly connected to the bottom end face of the positioning screw 71. Multiple card plates 7 and positioning screws 71 are provided and are equally spaced along the annular plate 51.

[0024] Multiple support legs 8 are fixedly connected to the base plate 1. Support legs 8 are located at each of the four corners of the base plate 1. A caster wheel 81 with a brake mechanism is fixedly connected to the bottom end of each support leg 8. A fixing plate 82 is fixedly connected to each support leg 8, and an anchor bolt 83 passes through the fixing plate 82. A handwheel 84 is fixed to the upper end of each anchor bolt 83. The support legs 8 are connected by rods to increase their stability.

[0025] To protect the internal components of this device, a housing that matches this device is fixedly connected to the base plate 1 (not shown in the accompanying drawings).

[0026] Working principle: Device positioning and fixing: Push the base plate 1, and move the device to the pile position by means of the universal wheel 81 with brake mechanism at the bottom of the support leg 8, so that the positioning hole 11 in the middle of the base plate 1 is aligned with the center of the pile position; then rotate the handwheel 84 to drive the anchor bolt 83 on the fixing plate 82 to screw downward into the ground until the anchor bolt 83 is firmly in contact with the ground, and at the same time lock the brake mechanism of the universal wheel 81 to complete the fixing of the device and prevent displacement during construction.

[0027] Adjusting the diameter of the steel casing: Based on the diameter of the steel casing to be positioned, the operators work together to push multiple sets of operating rods 54 on the circumferential wall of the annular plate 51, causing the annular plate 51 to rotate on the base plate 1. At this time: In the initial position, one end of the limiting groove 55 is close to or in contact with the limiting post 56. As the annular plate 51 rotates, the one end of the limiting groove 55 gradually moves away from the limiting post 56, while the other end gradually moves closer, until the other end of the limiting groove 55 abuts against the limiting post 56, at which point the annular plate 51 stops rotating to avoid over-adjustment. The cylindrical guide slider 53, which is fixed to the positioning rod 2, slides synchronously in the arc-shaped groove 52 of the annular plate 51. It moves from the first end (or the last end) of the arc-shaped groove 52 near the inner ring to the last end (or the first end), driving the positioning rod 2 to move synchronously along the radial groove on the base plate 1 until the guide wheel 4 on the inner wall of the vertical plate 3 at the ends of the multiple sets of positioning rods 2 is adapted to the outer wall of the steel casing.

[0028] Locking and adjusting position: After adjustment, tighten the positioning screw 71 on the clamping plate 7 so that the anti-slip rubber pad at the bottom of the positioning screw 71 is in close contact with the circumferential wall of the annular plate 51, to prevent the positioning rod 2 from shifting due to the rotation of the annular plate 51 during subsequent construction, and to ensure positioning accuracy.

[0029] Lowering and positioning the steel casing: The steel casing is slowly lowered from above the positioning hole 11 on the base plate 1. The outer wall of the steel casing contacts the guide wheel 4 on the inner wall of the vertical plate 3. The guide wheel 4 rotates at equal intervals along the length of the vertical plate 3, converting the sliding friction of the steel casing into rolling friction, reducing the lowering resistance and wear on the surface of the steel casing. At the same time, multiple sets of guide wheels 4 form circumferential limits on the steel casing, ensuring that the steel casing is lowered vertically along the central axis of the positioning hole 11, thus completing the positioning.

[0030] Maintenance and Storage: After construction is completed, loosen the positioning screw 71 and anchor bolt 83, unlock the annular plate 51 and retract the anchor bolt, and push the device to the storage position; if the guide wheel 4 is worn, the bolt on the support plate 21 at the end of the positioning rod 2 can be removed, and the vertical plate 3 can be removed for replacement. The outer shell on the base plate 1 can protect the internal components when not under construction, thus extending the service life of the device.

[0031] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the scope of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this utility model's implementation.

[0032] The present invention has been described above with reference to preferred embodiments, but the scope of protection of the present invention is not limited thereto. All technical solutions falling within the scope of the claims are within the scope of protection of the present invention. Various modifications can be made to the present invention, and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A positioning device for a cast-in-place pile steel casing, comprising a base plate (1) with a positioning hole (11) in the middle, characterized in that: Multiple positioning rods (2) are slidably connected on the substrate (1). The positioning rods (2) are arranged along the circumferential direction of the positioning hole (11). A driving assembly for driving the positioning rods (2) to move radially along the positioning hole (11) is provided on the substrate (1). The ends of the positioning rods (2) are detachably connected to a vertical plate (3). Multiple guide wheels (4) are rotatably connected to the inner wall of the vertical plate (3).

2. The positioning device for a cast-in-place pile steel casing according to claim 1, characterized in that: The driving assembly includes an annular plate (51) rotatably connected to the base plate (1), an arc-shaped groove (52) formed on the annular plate (51), a guide slider (53) slidably connected in the arc-shaped groove (52), and an operating rod (54) fixedly connected to the annular plate (51). The tail end of the arc-shaped groove (52) is close to the outer ring of the annular plate (51), and the head end of the arc-shaped groove (52) is close to the inner ring of the annular plate (51). The guide slider (53) is fixedly connected to the positioning rod (2).

3. The positioning device for a cast-in-place pile steel casing according to claim 2, characterized in that: A limiting groove (55) is provided along the circumferential direction of the annular plate (51) to limit the rotation angle of the annular plate (51). A limiting post (56) is slidably arranged in the limiting groove (55), and the limiting post (56) is fixedly connected to the base plate (1).

4. A positioning device for a cast-in-place pile steel casing according to claim 2, characterized in that: A card plate (7) is fixed on the substrate (1). A slot matching the outer edge of the annular plate (51) is opened on the card plate (7). A positioning screw (71) is threaded through the card plate (7).

5. A positioning device for a cast-in-place pile steel casing according to any one of claims 1 to 4, characterized in that: Multiple legs (8) are fixedly connected to the base plate (1). A universal wheel (81) is fixedly connected to the bottom end of the legs (8). A fixing plate (82) is fixedly connected to the legs (8). Anchor bolts (83) are passed through the fixing plate (82). A handwheel (84) is fixed to the upper end of the anchor bolts (83).

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