Large-diameter pile foundation reinforcement cage positioning device

Abstract

The utility model relates to the field of bridge engineering deepwater large-diameter pile foundation construction, in particular to a large-diameter pile foundation reinforcement cage positioning device. According to the positioning device, a steel reinforcement cage is placed in a pile foundation casing through a positioning assembly, the positioning assembly comprises a lifting point plate, two positioning parts arranged on the two sides of the lifting point plate and a lifting bar, one end of the lifting bar is connected with the positioning parts, and the other end of the lifting bar is connected with the steel reinforcement cage; and the positioning part is matched and fixed with the cylinder wall of the pile casing top, so that the reinforcement cage is fixed at the point position. According to the positioning device, a hanging support does not need to be erected on site, the reinforcement cage is connected through the hanging bar with the right length, the positioning part is hung on the top of the pile casing, the shape of the positioning part can be matched and clamped with the wall of the pile casing, and therefore the reinforcement cage cannot shake after being hung and is accurately positioned on a determined point position. And the stable state is kept in the subsequent process, positioning is accurate, and the construction efficiency is high.

Description

Technical Field

[0001] This embodiment relates to the field of construction of deep - water large - diameter pile foundations in bridge engineering, and particularly to a positioning device for the steel cage of a large - diameter pile foundation. Background Art

[0002] In the bridge structure of a super - large bridge, the bridge pile foundation is generally a large - diameter pile foundation, with the pile diameter greater than 3 meters, the pile depth greater than 80 meters, and the weight of the steel cage greater than 60 tons. During the construction of a conventional large - diameter bridge pile foundation, the steel casing is first driven into the formation. Since it is necessary to restrain the concrete to be poured into the pile foundation so that it can bear the axial pressure, a steel cage needs to be placed into the casing. After the steel cage is placed into the casing, it is necessary to ensure that the position of the steel cage is correct and it remains in a stable state.

[0003] The existing steel cage positioning uses a positioning derrick as a suspension system. A suspension bracket that can be suspended is assembled on the ground to lift the steel cage and make it stable in the proper position. When positioning the steel cage, a large amount of time is required to adjust the position relationship between the spliced steel bars of the steel cage and the suspension system. In addition, the suspension points of the steel cage derrick need to be installed on - site, and a great deal of energy is required to control the safety and quality of the suspension points during the process. The process is complex, and the steel cage suspension derrick needs to bear the total weight of the steel cage, with high structural requirements and a complex device. Therefore, it is necessary to develop an efficient and safe positioning method for the steel cage of a large - diameter pile foundation for the construction of the steel cage positioning of a deep - water large - diameter pile foundation. Summary of the Utility Model

[0004] This embodiment of the specification provides a positioning device for the steel cage of a large - diameter pile foundation. The positioning assembly is used to place the steel cage into the pile foundation casing. The positioning assembly includes a lifting point plate, two positioning parts arranged on both sides of the lifting point plate, and a lifting bar with one end connected to the positioning part. It is characterized in that: the other end of the lifting bar is connected to the steel cage; the positioning part is fixedly matched with the barrel wall at the top of the casing, so that the steel cage is fixed at the position.

[0005] This embodiment of the specification provides a positioning assembly that can be suspended on the top of the casing. From top to bottom, it is a lifting point plate, a pair of symmetric positioning parts and a lifting bar, which are connected in sequence. The steel cage is connected by a lifting bar with just the right length and is suspended on the top of the casing by the positioning part. Moreover, the shape of the positioning part can be matched and clamped with the casing wall, so that the steel cage will not shake after being suspended, but is accurately positioned at a determined position and remains stable during subsequent processes. It overcomes the existing technical defects, eliminates the need to build a suspension bracket on - site, has accurate positioning, is safe and reliable, and has high construction efficiency.

[0006] Further as a preferred solution, the lifting point plate is a rectangular flat plate, and a lifting hole for hoisting is opened in the center.

[0007] Further as a preferred solution, the two positioning parts are respectively and perpendicularly fixed to the side surfaces of the suspension point plate; the two positioning parts are parallel to each other.

[0008] Further as a preferred solution, the positioning part is provided with a groove that can match the barrel wall of the top of the casing, so that when the barrel wall of the top of the casing is inserted into the positioning part, the positioning part can be suspended on the top of the casing.

[0009] Further as a preferred solution, the suspension bar is a reinforcing bar of the same cross-section as the main reinforcing bar of the reinforcement cage.

[0010] Further as a preferred solution, the length of the suspension bar is the distance from the actual elevation of the top of the casing to the elevation of the top of the reinforcement cage.

[0011] Further as a preferred solution, the top end of the suspension bar is connected in alignment with the top end of the positioning part.

[0012] Further as a preferred solution, the bottom end of the suspension bar is provided with a tubular connecting part, which is connected to the top of the reinforcement cage.

[0013] Further as a preferred solution, the device includes at least two of the positioning assemblies.

[0014] Further as a preferred solution, the at least two positioning assemblies are symmetrically arranged.

[0015] The main beneficial effects of the above technical solutions are as follows:

[0016] This positioning device uses the positioning part to be suspended on the top of the casing, and the shape of the positioning part can be matched and clamped with the casing wall, so that the reinforcement cage will not shake after being suspended, but is accurately positioned at a determined point and remains stable in subsequent processes. There is no need to build a suspension bracket on site, and there is no need to use a temporary structure to bear the large weight of the reinforcement cage, making the construction safe and reliable and the construction efficiency high.

[0017] Further or more detailed beneficial effects will be described in combination with specific embodiments in the specific implementation manners. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further describes the present utility model with reference to the drawings:

[0019] Figure 1 It is the front view of the positioning device of this embodiment.

[0020] Figure 2 It is the side view of the positioning device of this embodiment.

[0021] Figure 3 It is the usage effect diagram of the positioning device of this embodiment.

[0022] As shown in the figure: positioning component 1, suspension point plate 2, suspension hole 21, positioning part 3, suspension bar 4, connecting part 5. Specific embodiments

[0023] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the specific embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] A positioning device for a large-diameter pile foundation steel cage, as Figure 1 and Figure 2 shown, the steel cage is placed into the pile foundation casing by using the positioning component 1. The positioning component 1 includes a suspension point plate 2, two positioning parts 3 arranged on both sides of the suspension point plate 2, and a suspension bar 4 with one end connected to the positioning part 3.

[0025] Specifically, the positioning component 1 in this embodiment is a fixed structure composed of multiple parts. The steel cage adapted to the large-diameter pile foundation is often huge in size and can reach a height of 100 meters after assembly. The steel cage is lifted into the pile foundation casing by a crane or other lifting device. Firstly, it needs to be accurately placed in position. Secondly, the steel cage needs to be fixed at the point to avoid displacement. Therefore, the positioning device in this embodiment can achieve both of the above two points. The positioning component 1 is directly connected to the lifting device and acts as a connection between the lifting device and the steel cage. It includes a suspension point plate 2. The suspension point plate 1 is a rectangular flat plate with a certain thickness. In general embodiments, the material is selected as steel. A suspension hole 21 is opened in the center of the suspension point plate 2. The rope or connector of the lifting device passes through the suspension hole 21 to apply force to the suspension point plate 2 and the entire positioning component 1. The suspension hole 21 is often arranged at the central position of the suspension point plate 2, so that the suspension point plate 1 is evenly stressed and can also maintain balance during the lifting process.

[0026] Furthermore, a pair of positioning parts 3 are fixed on the side plate of the hanging point plate 2, wherein the surface with the hanging hole 21 can be considered as the front side, and the two sides thereof are the side sides. Specifically, the positioning part 3 is also a flat plate structure made of steel, and its plate surface is perpendicular to the front side of the hanging point plate 2, and is welded and fixed on the side plate of the hanging point plate 2. The two positioning parts 3 are welded at the same height relative to the hanging point plate 2 and are parallel to each other, so that the hanging point plate 2 and the two positioning parts 3 on both sides form a symmetrical structure with two right angles. The positioning part 3 is provided with a groove that can match the wall of the top of the casing, and the width of the groove is slightly larger than the thickness of the wall of the casing, so that the casing wall of the top of the casing can be embedded in the groove of the positioning part 3. In some embodiments, the shape of the groove is a hook shape, and it can also be set to fit the shape of the top of the casing to form a greater friction force. When the wall of the top of the casing is embedded in the groove of the positioning part 3, the positioning part 3 can be stably fixed on the top of the casing by limiting the groove. The positioning parts 3 on both sides of the same hanging point plate 2 are symmetrically arranged relative to the hanging point plate 2, so that a pair of positioning parts 3 can be positioned and hung on the top of the casing at the same time, and the two have the same horizontal height, avoiding the tilting of the steel cage caused by the inconsistent positioning height of the positioning parts 3.

[0027] Furthermore, a hanger bar 4 is welded on the plate surface of the positioning part 3. The width of the hanger bar 4 is the width of the main bar of the steel cage, that is, the same cross-section, so that the hanger bar 4 has the strength and durability to lift the steel cage, and it is more convenient to connect with the cage top of the steel cage. The length of the hanger bar 4 is the distance from the actual casing top elevation to the cage top elevation of the steel cage. And the top of the hanger bar 4 is aligned with the top of the positioning part 3, so that the top of the positioning part 3 is flush with the casing top, that is, the top of the hanger bar 4 is consistent with the casing top height; the hanger bar naturally extends the length of the distance from the casing top to the cage top of the steel cage vertically downward, and the position of the bottom end of the hanger bar is exactly the height that the cage top needs to reach, that is, the precise positioning is completed. The casing top elevation is the height actually detected by the construction personnel, and the length of the hanger bar 4 needs to be adaptively changed after measurement to match the pile foundation casings of different maintenance conditions.

[0028] Furthermore, a connecting portion 5 is provided at the bottom end of the hanger bar 4. The connecting portion 5 is a mechanical connector that connects the hanger bar 4 to the steel cage. The connecting portion 5 needs to be connected to the steel bars at the top edge of the steel cage so that the positioning portion 3 above can be close to and fixed on the wall of the tube. Therefore, after the positioning portion 3 is fixed to the top of the casing, the hanger bar 4 is connected, and then the steel cage is connected through the connecting portion 5, so that the steel cage is suspended and fixed on the wall of the pile foundation casing through the above series of components, and the state is stable. In some embodiments, the connecting portion 5 can select a sleeve extrusion connection joint, a straight thread connection joint, etc., and the on-site connection takes a short construction period, is simple to operate, and has a high connection strength and is stable and reliable.

[0029] The positioning device of this embodiment requires at least two positioning components 1, and the positioning components 1 are symmetric with respect to the lifting device. Specifically, the connection points of the multiple positioning components 1 to the steel cage are symmetric, and are also symmetric with respect to the lifting device. The acting forces on the steel cage cancel each other out in the horizontal direction and maintain balance with each other, only generating an upward pulling force on the steel cage, keeping the steel cage stable and not tilting in a certain direction.

[0030] Briefly speaking, as Figure 3 shown, after the top of the steel cage is connected to the lifting bar 4 through the connecting part 5, the lifting device passes through the lifting point plate 2, and the entire positioning device together with the steel cage is lifted and placed into the pile foundation casing. When the positioning part 3 gradually descends to the top of the casing, the construction workers operate to make the groove of the positioning part 3 match and engage with the casing wall. After all the positioning parts 3 are matched and fixed, the lifting device leaves the lifting point plate. At this time, the lifting bar 4 drives the steel cage to hang vertically naturally, and the final stable position of the steel cage is the point required for the project.

[0031] The beneficial effects that can be produced by this embodiment include:

[0032] 1. This positioning device is suspended on the top of the casing by the positioning part, and the shape of the positioning part can match and engage with the casing wall, so that the steel cage will not shake after being suspended, but is accurately at a determined point and remains stable in subsequent processes.

[0033] 2. This device does not require a suspension bracket to be set up on site, nor does it need to use a temporary structure to bear the huge weight of the steel cage, making the construction safe and reliable and the construction efficiency high.

[0034] 3. The positioning device is fixed to the top of the casing on the ground, rather than inside the casing or on a suspended bracket, which is convenient for construction workers to adjust and recover the device, saving costs.

[0035] The above are only the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Additionally, in the embodiments of the present utility model, the terms "vertical", "horizontal", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product is usually placed during use. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. It should be further noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "attachment", "fixation", etc. in the description should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or a communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A large-diameter pile foundation steel cage positioning device, using a positioning assembly (1) to place a steel cage into a pile foundation casing, the positioning assembly (1) comprising a hanging point plate (2), two positioning parts (3) arranged on both sides of the hanging point plate (2) and a hanging rod (4) connected to the positioning part (3) at one end, characterized in that: The other end of the suspension bar (4) is connected to the steel cage; The positioning portion (3) is matched and fixed to the wall of the casing top, so that the steel cage is fixed at a point.

2. A large diameter pile foundation reinforcement cage positioning device according to claim 1, characterized in that: A lifting hole (21) for lifting is provided in the center of the lifting point plate (2).

3. A large diameter pile foundation reinforcement cage positioning device according to claim 1, characterized in that: The two positioning parts (3) are respectively fixed vertically to the side surfaces of the hanging point plate (2); The two positioning portions (3) are parallel to each other.

4. A large diameter pile foundation reinforcement cage positioning device according to claim 1, characterized in that: The positioning portion (3) is provided with a groove that can match the wall of the casing top, so that when the wall of the casing top is embedded in the positioning portion (3), the positioning portion (3) can be suspended on the top of the casing.

5. A large diameter pile foundation reinforcement cage positioning device according to claim 1, characterized in that: The hanger bars (4) are steel bars with the same cross-section as the main bars of the steel cage.

6. A large diameter pile foundation reinforcement cage positioning device according to claim 5, characterized in that: The length of the hanger bar (4) is the distance from the top elevation of the casing to the top elevation of the steel cage.

7. A large diameter pile foundation reinforcement cage positioning device according to claim 5, characterized in that: The top end of the hanging rod (4) is aligned and connected with the top end of the positioning portion (3).

8. A large diameter pile foundation reinforcement cage positioning device according to claim 5, characterized in that: A connecting portion (5) is provided at the bottom end of the suspension bar (4), and the connecting portion (5) is connected to the top of the steel cage.

9. A large diameter pile foundation reinforcement cage positioning device according to claim 1, characterized in that: The device comprises at least two positioning components (1).

10. A large diameter pile foundation reinforcement cage positioning device according to claim 9, characterized in that: The at least two positioning components (1) are symmetrically arranged.

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