Turnover hoisting structure for cast-in-situ bored pile

Abstract

The utility model provides a turnover hoisting structure of a cast-in-situ bored pile, which comprises a reinforcement cage capable of being placed in a pile hole, the reinforcement cage is used for internal support of concrete poured in the pile hole, the top of the reinforcement cage is provided with a pair of lengthened ribs, and the end parts of the two lengthened ribs are respectively connected with a hanging rib component. The structure has safety and stability, meanwhile, materials can be recycled, and resources are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a reusable hoisting structure for bored cast-in-place piles. Background Technique

[0002] In order to make full use of the land use area, the scale of underground space development is also getting larger and larger. The foundation pits are continuously developing in the directions of "deep, large, and close", and the requirements for deep foundation pit support and pile foundation engineering technologies are also getting higher and higher. Most of the foundations in areas near rivers, lakes, and rivers are soft foundations. Soft soil is saturated cohesive soil with relatively low shear strength, high compressibility, small permeability, and large natural water content. When it is used as the foundation of engineering buildings, it appears very soft and unstable. Therefore, when engineering activities are carried out in soft foundation areas, engineering geological disasters are likely to occur, mainly manifested as the buildings are prone to strong uneven settlement, and sometimes the foundation or slope instability is caused by sliding deformation, affecting the safe use of the buildings and construction safety.

[0003] The reasonable application of pile foundation engineering can not only be used to bear the load of buildings, support buildings and transfer their weights to the underlying soil layers; but also through soil reinforcement, the project can increase the bearing capacity of the foundation, resist soil sliding, settlement and inclination, thereby improving the stability of the entire foundation. Pile foundation engineering can be divided into two categories: precast piles and cast-in-place piles. Compared with precast piles, cast-in-place piles have strong adaptability, can adapt to different geological conditions and construction environments, and do not require splicing or cutting. At the same time, cast-in-place piles have strong bearing capacity and stability, and can meet various engineering requirements. In addition, cast-in-place piles save steel, wood and cement during the construction process, and the overall cost is relatively low. Therefore, cast-in-place piles are widely used in various foundation engineering.

[0004] However, pile foundation engineering belongs to hidden works, and its pile top elevation is below the basement floor slab. During the construction of cast-in-place concrete piles, hoisting bars are required to place the steel reinforcement cage to the designed elevation. The hoisting bars of existing engineering piles cannot be taken out after construction is completed, which is likely to cause waste of steel bars and increase construction costs. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a reusable hoisting structure for bored cast-in-place piles, which can realize the repeated use of materials and save resources while ensuring safety and stability.

[0006] To achieve the above object, the reusable hoisting structure for bored cast-in-place piles of the utility model includes a steel reinforcement cage that can be placed into the pile hole. The steel reinforcement cage is used for internal support during the pouring of concrete in the pile hole. A pair of extended bars are provided at the top of the steel reinforcement cage, and hoisting bar assemblies are respectively connected to the ends of the two extended bars.

[0007] Further, the suspension bar assembly includes an upper suspension bar, a bottom suspension bar and a threaded sleeve. Threaded sections are respectively provided at the bottom of the upper suspension bar and the top of the bottom suspension bar. The threaded portion of the upper suspension bar is threadedly connected to the top of the threaded sleeve, and the threaded portion of the bottom suspension bar is threadedly connected to the bottom of the threaded sleeve.

[0008] Further, the top of the lengthening bar is welded to the bottom of the bottom suspension bar.

[0009] Further, a lifting ring for connecting with the pile foundation platform is provided at the top of the upper suspension bar.

[0010] Further, the steel reinforcement cage includes a plurality of vertically arranged main reinforcement bars and a plurality of annular circular reinforcement bars. The planes where the circular reinforcement bars are located are parallel to each other. The main reinforcement bars are arranged on the circumference of the circular reinforcement bars, and the two lengthening bars are respectively located at both ends of the diameter of the circular reinforcement bars.

[0011] Further, a reinforcing bar that winds and turns back is also provided between adjacent circular reinforcement bars.

[0012] Further, a casing is provided on the inner wall of the top of the pile hole.

[0013] Further, a protruding isolation bar is provided in the middle of the lengthening bar.

[0014] The rotatable hoisting structure of the bored cast-in-place pile of the present utility model can, while meeting the safety and stability of the hoisting operation, take out the suspension bars after the initial setting of the concrete pouring, rotate them to other engineering piles for use, and reuse them, thus saving resources. Description of the Drawings

[0015] The present utility model will be further described and elaborated below in conjunction with the drawings.

[0016] Figure 1 is a schematic diagram of the rotatable hoisting structure of the bored cast-in-place pile of the preferred embodiment of the present utility model.

[0017] Figure 2 is a schematic diagram for embodying the connection mode between the upper suspension bar and the bottom suspension bar.

[0018] Reference numerals: 1, lengthening bar; 2, main reinforcement bar; 3, circular reinforcement bar; 4, reinforcing bar; 5, isolation bar; 6, upper suspension bar; 7, bottom suspension bar; 8, threaded sleeve; 9, lifting ring; 10, casing. Detailed Embodiment

[0019] The technical solution of the present utility model will be described more clearly and completely below in conjunction with the drawings and through the description of the preferred embodiments of the present utility model.

[0020] As Figure 1As shown in the figure, the rotatable hoisting structure of the bored cast-in-place pile in the preferred embodiment of the present utility model includes a steel reinforcement cage that can be placed into the pile hole. The steel reinforcement cage is used as the internal support for pouring concrete in the pile hole. The steel reinforcement cage includes several vertically arranged main reinforcement bars 2 and several annular circular reinforcement bars 3. The planes where each circular reinforcement bar 3 is located are parallel to each other. The main reinforcement bars 2 are arranged on the circumference of the circular reinforcement bars 3. Between adjacent circular reinforcement bars 3, there are also serpentine and folded reinforcement bars 4. At the top of the steel reinforcement cage, there is a pair of extended reinforcement bars 1, and the two extended reinforcement bars 1 are respectively located at the two ends of the diameter of the circular reinforcement bars 3. Selecting two symmetric main reinforcement bars 2 on the steel reinforcement cage to be extended as the extended reinforcement bars 1 can increase the stability during the hoisting process of the steel reinforcement cage and the verticality of the engineering pile placed below. Considering the over-pouring height of the bored cast-in-place pile concrete and the floating slurry at the top of the pile after concrete pouring, the two selected main reinforcement bars 2 need to be extended to about 1 m above the over-pouring height.

[0021] As Figure 1 and Figure 2 shown in the figure, the end parts of the two extended reinforcement bars 1 are respectively connected with hoisting bar assemblies. The hoisting bar assemblies include upper hoisting bars 6, bottom hoisting bars 7, and threaded sleeves 8. The upper hoisting bars 6 and the bottom hoisting bars 7 are made of HRB400 steel bars with a diameter of 25 mm. At the bottom of the upper hoisting bars 6 and the top of the bottom hoisting bars 7, there are respectively threaded sections. The threaded parts of the upper hoisting bars 6 are threadedly connected to the top of the threaded sleeve 8, and the threaded parts of the bottom hoisting bars 7 are threadedly connected to the bottom of the threaded sleeve 8. The top of the extended reinforcement bar 1 is welded to the bottom of the bottom hoisting bar 7. Below the bottom hoisting bar 7, it is connected to the extended reinforcement bar 1 by single-sided welding, and the welding length is not less than 10d. At the top of the upper hoisting bar 6, there is a lifting ring 9 for connecting to the pile foundation machine platform.

[0022] On the inner wall of the top of the pile hole, there is a casing 10. In the middle of the extended reinforcement bar 1, there is a protruding isolation bar 5.

[0023] Specific implementation process:

[0024] After the processing of the steel reinforcement cage and the preparation of the equipment are completed, first lift the steel reinforcement cage and hoist it to a position about 1 m above the ground for the main reinforcement bars 2, and fix the steel reinforcement cage; after assembling the bottom hoisting bar 7 and the upper hoisting bar 6 with the threaded sleeve 8, hoist it to the position of the extended main reinforcement bar 2, and connect the hoisting bar and the main reinforcement bar 2 by welding. Hoist the combination of the steel reinforcement cage and the hoisting bar as a whole to the design elevation. After the engineering pile is poured, after the concrete begins to set, use the lifting ring 9 of the upper hoisting bar 6 to unscrew the straight threaded sleeve 8, take out the upper hoisting bar 6, and turn it to other engineering pile construction for use.

[0025] The rotatable hoisting structure of the bored cast-in-place pile of the present utility model can, while meeting the safety and stability of the hoisting operation, take out the hoisting bars after the concrete pouring begins to set, turn them to other engineering piles for use, and reuse them, saving resources.

[0026] The above specific embodiments only describe the preferred embodiments of the present utility model, rather than limiting the protection scope of the present utility model. Without departing from the design concept and spirit of the present utility model, various deformations, substitutions, and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model based on the written description and drawings provided by the present utility model shall all fall within the protection scope of the present utility model. The protection scope of the present utility model is determined by the claims.

Claims

1. A structure for the turnover and hoisting of bored piles, characterized in that: It comprises a steel cage that can be placed in a pile hole, the steel cage is used for internal support of pouring concrete in the pile hole, a pair of lengthening bars (1) are arranged on the top of the steel cage, and the ends of the two lengthening bars (1) are respectively connected to a suspension bar assembly.

2. The rotatable hoisting structure of bored piles according to claim 1 is characterized in that: The suspension rod assembly comprises an upper suspension rod (6), a bottom suspension rod (7) and a threaded sleeve (8); the bottom of the upper suspension rod (6) and the top of the bottom suspension rod (7) are respectively provided with threaded sections; the threaded portion of the upper suspension rod (6) is threadedly connected to the top of the threaded sleeve (8), and the threaded portion of the bottom suspension rod (7) is threadedly connected to the bottom of the threaded sleeve (8).

3. The rotatable hoisting structure of bored pile according to claim 2 is characterized in that: The top of the lengthened rib (1) is welded to the bottom of the bottom suspension rib (7).

4. The rotatable hoisting structure of bored piles according to claim 2 is characterized in that: The top of the upper suspension bar (6) is provided with a suspension ring (9) for connecting with a pile foundation machine.

5. The rotatable hoisting structure of bored piles according to claim 1 is characterized in that: The steel cage comprises a plurality of vertically arranged main bars (2) and a plurality of annular round bars (3), the planes on which the round bars (3) are located are parallel to each other, the main bars (2) are arranged on the circumference of the round bars (3), and the two lengthening bars (1) are respectively located at the two ends of the diameter of the round bars (3).

6. The rotatable hoisting structure of bored piles according to claim 5 is characterized in that: A meandering reinforcing rib (4) is also provided between adjacent circular ribs (3).

7. The rotatable hoisting structure of bored piles according to claim 1 is characterized in that: A casing (10) is provided on the inner wall of the top of the pile hole.

8. The rotatable hoisting structure of bored piles according to claim 1 is characterized in that: A protruding isolation rib (5) is provided in the middle of the lengthened rib (1).

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