A cast-in-place pile reinforcement cage protection device

Abstract

A protection device for reinforcement cage of cast-in-place pile, comprising: a protection sleeve configured as a hollow ring structure; a support assembly comprising at least two members with internal threads, each of the members being connected to the protection sleeve by a plurality of support rods; a rotating shaft provided with external threads matched with the members; all the members being arranged in parallel within the protection sleeve, and the rotating shaft being controlled to pass through all the members; and the protection sleeve and the support assembly forming a rotating body capable of rotating freely around the rotating shaft. The application forms a protection layer capable of rotating in a ring shape, which is fixed to the radial periphery of the reinforcement cage, so as to automatically adjust the position when the reinforcement cage is suspended, and reduce the frictional resistance between the surface of the reinforcement cage and the pile hole; the reinforcement cage is accurately positioned in the pile hole, and the thickness of the protection layer is ensured to be constant and uniform; and the overall structure is simple, high in strength and good in reliability.

Description

Technical Field

[0001] This application belongs to the field of civil engineering construction technology, and is particularly applicable to protective devices that ensure accurate positioning of steel cages during the construction of cast-in-place piles. Background Technology

[0002] In civil engineering, cast-in-place piles are a common type of foundation, and their construction quality directly affects the safety and durability of the building. As the core load-bearing component of the cast-in-place pile, the accurate positioning of the reinforcing cage and the assurance of the protective layer thickness are crucial aspects of construction. Traditionally, concrete or plastic spacers are used to ensure the protective layer thickness. However, these spacers have several drawbacks: a single fixing method cannot adapt to dynamic adjustments during the lifting of the reinforcing cage; the friction between the spacer and the pile hole wall is high, easily leading to difficulties in lifting the reinforcing cage; the spacers lack sufficient strength and are easily damaged during lifting; and they cannot effectively ensure the centered position of the reinforcing cage in the pile hole, easily causing uneven protective layer thickness.

[0003] Various attempts and improvements have been made within the industry to address these issues, but the results have been unsatisfactory. Some methods use metal supports, but these are structurally complex; others have tried adjustable pads, but their reliability is insufficient. Therefore, there is an urgent need for a simple, easy-to-operate, and highly reliable rebar cage protection device and construction method. Summary of the Invention

[0004] This application provides a protective device for the reinforcing cage of a cast-in-place pile, which solves the technical problems of inaccurate positioning and easy displacement of the reinforcing cage in existing construction, easy deformation of the thickness of the protective device, and difficulty in hoisting the reinforcing cage.

[0005] To solve at least one of the above-mentioned technical problems, the technical solution adopted in this application is:

[0006] A protective device for the reinforcing cage of a cast-in-place pile includes:

[0007] The protective sleeve is constructed as a hollow ring structure;

[0008] The support assembly includes at least two components with internal threads, each of which is connected to the protective sleeve via a plurality of support rods;

[0009] A rotating shaft having an external thread that mates with the component;

[0010] All the components are arranged in parallel within the protective sleeve, and the rotating shaft is controlled to pass through all the components; the protective sleeve and the support assembly form a rotating body that can rotate freely about the rotating shaft; the rotating shaft with the protective sleeve and the support assembly is welded between adjacent main bars in the reinforcing cage and is evenly distributed along the radial periphery of the reinforcing cage; the protective sleeve and the support assembly can reduce the frictional resistance between the reinforcing cage and the pile hole.

[0011] Furthermore, a set of the aforementioned protective devices is installed at 2m intervals along the length of the pile, with 4 of the aforementioned protective devices in each set, arranged in pairs opposite to each other.

[0012] Furthermore, the outer wall surface of the component is constructed as a polygonal structure; on the polygonal outer wall surface of the component, each side is provided with a support rod that is connected to the inner wall of the protective sleeve.

[0013] Furthermore, one end of the support rod is welded to the outer wall of the component, and the other end is welded to the inner wall of the protective sleeve.

[0014] Furthermore, the protective sleeve is 50-80mm long, and its length is less than the length of the rotating shaft; the rotating shaft is 180-200mm long.

[0015] Furthermore, the component is constructed at both ends of the protective sleeve; and the thread diameter of the component is 9-12mm, and the thickness of the component is 5-10mm.

[0016] Furthermore, the support rod is constructed as a round steel bar with an outer diameter of 8-10mm, and its welding length to the inner wall of the protective sleeve and the component is not less than 20mm.

[0017] The protective device of this application forms a rotatable protective layer that is fixed to the radial periphery of the reinforcing cage. This allows for automatic position adjustment when the reinforcing cage is suspended and lowered, and reduces the frictional resistance between the surface of the reinforcing cage and the pile hole. It also ensures accurate positioning of the reinforcing cage in the pile hole and guarantees that the thickness of the protective layer remains constant and uniform. The overall structure is simple, strong, and reliable. Attached Figure Description

[0018] Figure 1 This is a perspective view of the protective device for the reinforcing cage of the cast-in-place pile in this application;

[0019] Figure 2 This is a sectional view of the protective device for the reinforcing cage of the cast-in-place pile in this application;

[0020] Figure 3 This is a structural schematic diagram of one of the components in this application;

[0021] Figure 4 This is a structural schematic diagram of another component in this application;

[0022] Figure 5 This is a perspective view of the protective device and the reinforcing cage in this application.

[0023] Figure 6 This is a top view of the protective device in this application in conjunction with the reinforcing cage;

[0024] Figure 7 This is a front view of the protective device and the reinforcing cage in this application.

[0025] In the diagram: 100, protective device; 200, steel cage; 10, protective sleeve; 20, support assembly; 21, component; 22, support rod; 30, rotating shaft. Detailed Implementation

[0026] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] This embodiment proposes a protective device 100 for the reinforcing cage of a cast-in-place pile, such as... Figure 1-2 As shown, the device includes a protective sleeve 10, a support assembly 20 housed inside the protective sleeve 10, and a rotating shaft 30 that mates with the support assembly 20. The protective sleeve 10 is constructed as a hollow annular structure. The support assembly 20 includes at least two parallel members 21 arranged axially on the protective sleeve 10, both members 21 having internal threads. Each member 21 is connected to the protective sleeve 10 via several support rods 22. The outer wall of the rotating shaft 30 has external threads that mate with the members 21. All members 21 are arranged in parallel within the protective sleeve 10 and are located on the axis of the protective sleeve 10. The rotating shaft 30 passes through all members 21 and is threadedly engaged with all members 21. The protective sleeve 10 and the support assembly 20 form a rotating body that can rotate freely about the rotating shaft 30. Figure 5 As shown, the rotating shaft 30 with protective sleeve 10 and support component 20, that is, the protective sleeve 10, support component 20 and rotating shaft 30 together form an integrated protective device 100. The rotating shaft 30 is welded between adjacent main bars in the reinforcing cage 200 and is evenly distributed along the radial periphery of the reinforcing cage 200. The protective sleeve 10 and support component 20 form an annular protective layer with a certain thickness. When the reinforcing cage 200 is suspended in the pile hole, the annular protective layer can reduce the frictional resistance between the reinforcing cage 200 and the pile hole, so that the reinforcing cage 200 can be accurately positioned in the pile hole without deviation.

[0028] like Figure 6 As shown, when installing the protective devices 100, a set of protective devices 100 is set at 2m intervals along the pile length direction, with 4 protective devices 100 in each set. That is, several layers of protective devices 100 are set every 2m along the pile length and height direction, with 4 protective devices 100 arranged in pairs facing each other in each layer. The rotatable protective devices 100, set at intervals, are evenly distributed along the periphery of the reinforcing cage 200's radial surface. This not only protects the reinforcing cage 200 from being squeezed by the pile hole, but also effectively solves problems such as inaccurate positioning and difficult hoisting of the reinforcing cage 200 in traditional construction. It can also significantly improve the construction quality of cast-in-place piles, reduce construction difficulty, and increase work efficiency.

[0029] like Figure 3-4 As shown, the outer wall of component 21 is constructed as a polygonal structure; on each side of the polygonal outer wall of component 21, a support rod 22 is provided and connected to the inner wall of the protective sleeve 10. One end of the support rod 22 is welded to the outer wall of component 21, and the other end is welded to the inner wall of the protective sleeve 10. Furthermore, component 21 can be a standard nut, such as an M10 hexagonal standard nut, etc. Figure 3 As shown; of course, it can also be a non-standard polygonal structure, such as a pentagonal structure, such as... Figure 4 As shown in the figure; of course, it can also be a quadrilateral or octagonal structure, which is omitted in the attached figure; as long as it is a polygonal structure, the support rod 22 can be stably and safely welded to its outer wall surface. Preferably, the component 21 is welded and fixed to both ends of the length of the protective sleeve 10; and the thread root diameter of the component 21 is 9-12mm, slightly larger than the diameter of the rotating shaft 30; the thickness of the component 21 is 5-10mm.

[0030] Preferably, the protective sleeve 10 is a Q235B steel pipe with an outer diameter of 100mm and a length of 50-80mm, and its length is less than the length of the rotating shaft 30. The length of the rotating shaft 30 is 180-200mm, which is determined by the spacing of the main reinforcing bars in the reinforcing cage 200, which is typically 150-200mm. After welding both ends of the rotating shaft 30 to the main reinforcing bars of the reinforcing cage 200, the rotating shaft 30 has at least 120-150mm of external thread length in its length direction, ensuring sufficient length for the component 21 to move the protective sleeve 10 left and right.

[0031] Furthermore, the support rod 22 is constructed as a round steel bar with an outer diameter of 8-10 mm. Preferably, it can be an HPB300 grade round steel bar. The weld length between the support rod 22 and the inner wall of the protective sleeve 10 and the component 21 is required to be no less than 20 mm, in order to improve the strength of the connection between the component 21 and the protective sleeve 10. The length of the support rod 22 is determined based on the diameter of the protective sleeve 10 and the diameter of the inscribed circle of the outer wall surface of the component 21. One end of the support rod is welded to the outer wall surface of the component 21, and the other end is welded to the inner wall of the protective sleeve 10. The weld should be firm to ensure sufficient support strength.

[0032] In this embodiment, the diameter of the cast-in-place pile is 800mm, the required protective layer thickness is 50mm, and the pile length and depth are 25m. The protective device 100 of this embodiment is used for protection. When the rotating shaft 30 is welded to the main reinforcement of the reinforcing cage 200, the rotating shaft 30 is positioned close to the reinforcing cage 200. Correspondingly, the inner radius of the protective sleeve 10 is placed inside the reinforcing cage 200, and its outer radius is close to the pile hole side. Thus, the radius of the protective sleeve 10 is the thickness of the protective layer. The reinforcing cage 200 can be smoothly hoisted into the pile hole without significant obstruction. After the reinforcing cage is in place, the protective layer thickness deviation is within ±5mm, and the construction efficiency is about 30% higher than that of traditional methods. After concrete pouring, the pile body quality is uniform, with no exposed reinforcement.

[0033] A construction method for a protective device for the reinforcing cage of a cast-in-place pile, such as Figure 5-7 As shown, using the protection device described above, the steps include:

[0034] The protective sleeve 10, support rod 22, and component 21 are assembled and fitted onto the rotating shaft 30; that is, the rotating shaft 30 is welded between adjacent main reinforcement bars, ensuring a firm weld and a horizontal axis. During welding, the rotating shaft 30 should be kept horizontal, and the weld length should be no less than 30mm. The installation position of the protective device 100 should avoid the reinforcing hoops and connection points of the reinforcing cage 200. The protective sleeve 10-support rod 22-component 21 assembly is fitted onto the rotating shaft 30 to form the protective device 100, and the rotation is checked for flexibility.

[0035] The rotating shaft is welded between adjacent main bars in the steel cage; a set of protective devices 100 is set at 2m intervals along the length of the pile, with 4 protective devices 100 in each set, arranged in pairs opposite each other.

[0036] Before hoisting, check the installation status and rotation flexibility of all protective devices 100; and use special lifting tools to lift the steel cage 200 smoothly and control the lowering speed.

[0037] When hoisting the reinforcing cage 200, the lowering speed should be controlled at 0.5-1.0 m / min. If resistance is encountered, the reinforcing cage can be rotated appropriately. The protective sleeve 10 can rotate around the rotating shaft 30 to reduce frictional resistance between the reinforcing cage and the pile hole wall. During the lowering process, the protective sleeve 10 of the protective device 100 can rotate freely when in contact with the pile hole wall, reducing frictional resistance. If resistance is encountered, the reinforcing cage 200 can be rotated appropriately, utilizing the rotational characteristics of the protective device 100 to overcome local resistance.

[0038] After the reinforcing cage is in place, the protective device remains supported to ensure that the protective layer thickness remains constant. Check the contact between the protective device and the pile hole wall, and also check its centering to ensure that the centering deviation of the reinforcing cage does not exceed 10mm. Make fine adjustments if necessary. After confirming that the position is correct, proceed with concrete pouring.

[0039] The protective device of this application forms a rotatable annular protective layer, which is fixed to the radial periphery of the reinforcing cage. This allows for automatic position adjustment when the reinforcing cage is suspended and lowered, and reduces the frictional resistance between the surface of the reinforcing cage and the pile hole. It also ensures accurate positioning of the reinforcing cage within the pile hole and guarantees a constant and uniform protective layer thickness. The overall structure is simple, strong, and reliable. This application also proposes a construction method for a reinforcing cage protection device that is easy to operate and has high construction efficiency.

[0040] The embodiments of this application have been described in detail above. These descriptions are merely preferred embodiments and should not be construed as limiting the scope of this application. All equivalent variations and modifications made within the scope of this application should still fall within the patent coverage of this application.

Claims

1. A protective device for the reinforcing cage of a cast-in-place pile, characterized in that, include: The protective sleeve is constructed as a hollow ring structure; The support assembly includes at least two components with internal threads, each of which is connected to the protective sleeve via a plurality of support rods; A rotating shaft having an external thread that mates with the component; All the aforementioned components are arranged in parallel within the protective sleeve, and the rotation axis is controlled to pass through all the aforementioned components; the protective sleeve and the support assembly form a rotating body that can rotate freely about the rotation axis; The rotating shaft, equipped with the protective sleeve and the support assembly, is welded between adjacent main bars in the reinforcing cage and is evenly distributed along the radial periphery of the reinforcing cage; the protective sleeve and the support assembly can reduce the frictional resistance between the reinforcing cage and the pile hole.

2. The reinforcement cage protection device for cast-in-place piles according to claim 1, characterized in that, A set of the protection devices is installed at 2m intervals along the length of the pile, with 4 protection devices in each set, arranged in pairs opposite each other.

3. A protective device for the reinforcing cage of a cast-in-place pile according to claim 1 or 2, characterized in that, The outer wall of the component is constructed as a polygonal structure; on the polygonal outer wall of the component, each side is provided with a support rod that is connected to the inner wall of the protective sleeve.

4. The reinforcement cage protection device for cast-in-place piles according to claim 3, characterized in that, One end of the support rod is welded to the outer wall of the component, and the other end is welded to the inner wall of the protective sleeve.

5. A protective device for the reinforcing cage of a cast-in-place pile according to claim 4, characterized in that, The protective sleeve is 50-80mm long, and its length is less than the length of the rotating shaft; the rotating shaft is 180-200mm long.

6. A protective device for the reinforcing cage of a cast-in-place pile according to any one of claims 1-2 and 4-5, characterized in that, The component is constructed at both ends of the protective sleeve; and the thread root diameter of the component is 9-12mm, and the thickness of the component is 5-10mm.

7. A protective device for the reinforcing cage of a cast-in-place pile according to claim 6, characterized in that, The support rod is constructed as a round steel bar with an outer diameter of 8-10mm, and its welding length to the inner wall of the protective sleeve and the component is not less than 20mm.

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