Prestressed concrete variable-core prefabricated combined square pile and prefabricated pile

Abstract

The utility model relates to the technical field of reinforced concrete prefabricated piles, in particular to a prestressed concrete variable core prefabricated combined square pile and a prefabricated pile, which comprise a solid square pile section and a hollow square pile section which are integrally arranged up and down and aligned; the sections of the solid square pile section and the hollow square pile section are square and have the same circumference; a plurality of inner longitudinal bars are uniformly arranged along the peripheral edges of the sections in the solid square pile section and the hollow square pile section, and the inner longitudinal bars are generally arranged in the vertical direction; a first inner stirrup is arranged in the solid square pile section; a second inner stirrup is arranged in the hollow square pile section; the first inner stirrup and the second inner stirrup are bound to the outer side of the inner longitudinal bar in a surrounding mode. Under the condition that the pile length is not increased, the link of filling concrete required by the reinforced concrete prefabricated hollow pile is omitted, but the side friction resistance required by the pile body is not reduced, so that the construction cost is effectively reduced, the construction period is greatly shortened, the labor cost is saved, and the construction is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of reinforced concrete prefabricated piles, in particular to a prestressed concrete variable core prefabricated combined square pile and a prefabricated pile. Background Art

[0002] Prestressed concrete precast square piles are a widely used type of pile in the current market. However, the diameter of these precast piles is usually consistent from top to bottom, while the lower part of the pile body does not need to have a larger diameter, which leads to a waste of raw materials.

[0003] Prestressed concrete precast pipe piles and prestressed concrete precast hollow square piles have thin walls, making it difficult to desilt the hollow holes during construction when used as upper section piles to connect to the abutment. This can result in insufficient concrete filling, impacting construction quality and safety. In seismic-resistant areas, these two types of piles lack shear resistance due to their hollow structures. While solid concrete square piles do not present shear resistance issues, they require a large amount of concrete per pile, which also results in waste of raw materials.

[0004] Compared to prestressed concrete pipe piles, the main reinforcement of prestressed concrete square piles can be directly anchored to the steel bars through mechanical connection, ensuring that the anchor steel bars and the prestressed main bars are located on the same axis. When used as pullout piles, the recommendations of relevant specifications should be followed, and caution should be exercised in the use of prestressed concrete pipe piles for pullout piles.

[0005] Currently published patents mostly feature variable-diameter combined pile designs. This design incorporates a transition device at the diameter change point, making the outer diameter of the upper pile larger than that of the lower pile. This theoretically reduces the use of raw materials. However, in practice, this design significantly increases the cost of making the pile mold, and the transition device's construction and reinforcement are complex, making it uneconomical. Utility Model Content

[0006] In view of the above problems and / or the problems existing in the existing prestressed concrete prefabricated square piles, the present utility model is proposed.

[0007] Therefore, the purpose of the present invention is to provide a prestressed concrete variable core prefabricated composite square pile and prefabricated pile, which can reduce the use of raw materials while meeting the construction conditions and stress.

[0008] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0009] A prestressed concrete variable core prefabricated composite square pile, comprising a solid square pile section and a hollow square pile section integrally arranged and aligned above and below; the solid square pile section and the hollow square pile section are both square in cross-section and have equal perimeters;

[0010] A plurality of inner longitudinal reinforcements are evenly arranged along the edges of the cross section of the solid square pile segment and the hollow square pile segment, and the inner longitudinal reinforcements are arranged vertically in a normal manner;

[0011] A first inner stirrup is provided inside the solid square pile segment; a second inner stirrup is provided inside the hollow square pile segment; and the first and second inner stirrups are respectively bound around the outside of the inner longitudinal reinforcement.

[0012] Furthermore, the combined square piles are connected to the base steel bars through threaded steel bars and threaded sleeves.

[0013] Furthermore, the density of the first inner stirrup is greater than that of the second inner stirrup.

[0014] Furthermore, during the pile sinking process, the interior of the hollow square pile section is filled with an upper layer of soft soil.

[0015] Furthermore, the combined square piles are friction piles.

[0016] A prestressed concrete precast pile, when the precast pile is a single pile, has a pile body made of the above-mentioned prestressed concrete variable core precast composite square pile, and a solid square pile section at least 3 meters below the pile top.

[0017] When precast piles need to be connected at one time, the upper pile section adopts the above-mentioned prestressed concrete variable-core precast composite square pile; the lower pile section adopts a hollow square pile of the same size, and the upper and lower pile sections are connected by threaded sleeves or welding.

[0018] When precast piles need to be connected multiple times, the single pile connecting the pile top adopts the above-mentioned prestressed concrete variable core precast composite square pile; the multi-section piles below the composite square pile adopt whole-section hollow square piles, and the adjacent upper and lower section piles are connected by threaded sleeves or welding.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] First, although the pile cross-section is reduced, the lateral friction resistance around the pile does not decrease. Since the cross-sectional circumferences of the solid square pile segment and the hollow square pile segment are equal, the lateral friction resistance values ​​of the two are equal.

[0021] Second, the pile's horizontal lateral resistance meets the requirements. This means that within the required range of horizontal force resistance, square piles with a large cross-sectional moment of inertia are used. Once the horizontal force has decayed to a smaller area, hollow square piles are used. This effectively reduces the amount of steel and concrete used, allowing all parts of the pile to fully and effectively function. Furthermore, in areas with less water and soil corrosion, hollow square piles are used once the horizontal force has decayed to a smaller area, effectively reducing the amount of concrete used.

[0022] Third, since the upper part of the composite pile adopts reinforced concrete precast solid pile, the step of pouring core concrete required for reinforced concrete precast hollow pile is eliminated, thereby effectively reducing the cost, greatly shortening the construction period, saving labor costs and making construction more convenient.

[0023] Fourth, influenced by the designed pile length, according to the geological report and structural calculations, solid square pile sections and hollow square pile sections can be combined and connected based on the needs and on the basis of meeting the horizontal and vertical bearing capacities. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive labor. Among them:

[0025] Figure 1 This is a schematic diagram of the structure of the prestressed concrete variable core prefabricated composite square pile of the utility model;

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the solid square pile segment 1-1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the cross-sectional structure of the hollow square pile section 2-2 of the present invention;

[0028] Among them: 1. Solid square pile segment; 1a. First inner stirrup; 2. Hollow square pile segment; 2a. Second inner stirrup; 3. Inner longitudinal reinforcement; 4. Nut sleeve. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing the embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0032] See also Figures 1 to 3The utility model provides a prestressed concrete variable-core prefabricated composite square pile, comprising a solid square pile segment 1 and a hollow square pile segment 2 that are integrally arranged and aligned above and below; the cross-sections of the solid square pile segment 1 and the hollow square pile segment 2 are both square and have equal perimeters, and the consistency of the cross-sectional dimensions ensures that the use of the square piles is not affected.

[0033] The entire composite square pile is connected to the pile cap reinforcement through threaded steel bars and threaded sleeves. The connection between the pile body reinforcement and the cap is achieved by rotating the threads. This part of the content is prior art. The structure of the threaded sleeve is described in detail in patent application number 2024223159473 and will not be repeated here.

[0034] A plurality of inner longitudinal reinforcements 3 are evenly arranged along the edges of the cross section of the solid square pile section 1 and the hollow square pile section 2. The inner longitudinal reinforcements 3 are arranged vertically in a conventional manner, which makes it easier to meet the distribution requirements of the vertical longitudinal reinforcements.

[0035] The solid square pile segment 1 is provided with a first inner stirrup 1a; the hollow square pile segment 2 is provided with a second inner stirrup 2a. The first and second inner stirrups are respectively tied around the outside of the inner longitudinal reinforcement 3 within their respective regions. Preferably, the first inner stirrup 1a is tied at a greater density than the second inner stirrup 2a to meet the strength requirements of the solid square pile segment 1.

[0036] When using the hollow square pile section 2 that is arranged in an integrated manner, the amount of concrete used can be reduced; during the pile sinking process, the hollow part of the lower hollow square pile section can be filled with upper soft soil, reducing the amount of soil squeezed and improving the bearing capacity of the square pile.

[0037] The combined square piles are friction piles, that is, they are made by combining solid square sections with hollow square sections. The specific method can be flexibly adjusted according to the on-site working conditions.

[0038] The present invention also protects a prestressed concrete precast pile. When the length of a single combined square pile meets the precast pile design requirements, a solid square pile section 1 is provided at least 3 meters below the pile top. Alternatively, this value can be determined based on the depth of the silty soil in the geological environment of the individual project. The pile top is selected according to the national standard atlas or the factory standard atlas.

[0039] When the length of a single composite square pile does not meet the design requirements and a single splice is required, the upper section of the pile is constructed with a composite square pile because it must withstand the larger horizontal bearing capacity of the upper soil. The lower section is constructed with a hollow square pile of the same size, and the upper and lower sections are connected or welded using a threaded sleeve 4. When multiple splices are required, the single pile at the top of the pile is constructed with a composite square pile, and the multiple sections below the composite square pile can all be constructed with a single hollow square pile. The adjacent upper and lower sections are connected or welded using a threaded sleeve 4.

[0040] While the present invention has been described above with reference to specific embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as no structural conflicts exist, the various features of the embodiments disclosed herein may be combined with one another in any manner, and the omission of an exhaustive description of these combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A prestressed concrete variable core prefabricated composite square pile, characterized by: It comprises a solid square pile section and a hollow square pile section which are integrally arranged and aligned with each other; the cross-sections of the solid square pile section and the hollow square pile section are both square and have equal perimeters; A plurality of inner longitudinal reinforcements are evenly arranged along the edges of the cross section of the solid square pile section and the hollow square pile section, and the inner longitudinal reinforcements are arranged vertically throughout the length; A first inner stirrup is provided inside the solid square pile segment; a second inner stirrup is provided inside the hollow square pile segment; and the first and second inner stirrups are respectively bound around the outside of the inner longitudinal reinforcement.

2. The prestressed concrete variable core prefabricated composite square pile according to claim 1, characterized in that: The combined square pile is connected to the base steel bar through threaded steel bars and threaded sleeves.

3. The prestressed concrete variable core prefabricated composite square pile according to claim 1, characterized in that: The density of the first inner stirrup is greater than that of the second inner stirrup.

4. The prestressed concrete variable core prefabricated composite square pile according to claim 1, characterized in that: During the pile sinking process, the interior of the hollow square pile section is filled with an upper layer of soft soil.

5. The prestressed concrete variable core prefabricated composite square pile according to claim 1, characterized in that: The combined square pile is a friction type pile.

6. A prestressed concrete precast pile, characterized by: When the precast pile is a single pile, the pile body adopts the prestressed concrete variable core precast composite square pile according to any one of claims 1 to 5.

7. The prestressed concrete precast pile according to claim 6, characterized in that: The area at least 3 meters below the pile top is a solid square pile section.

8. A prestressed concrete precast pile, characterized by: When precast piles need to be connected at one time, the upper pile section adopts the prestressed concrete variable core precast composite square pile described in any one of claims 1 to 5; the lower pile section adopts a hollow square pile of the same size, and the upper and lower pile sections are connected by threaded sleeves or welded.

9. A prestressed concrete precast pile, characterized by: When prefabricated piles need to be connected multiple times, the single pile connecting the pile top adopts the prestressed concrete variable core prefabricated composite square pile described in any one of claims 1 to 5; the multi-section piles below the composite square pile adopt whole-section hollow square piles, and the adjacent upper and lower section piles are connected by threaded sleeves or welded.

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