Prestressed concrete four-eight variable core combined square pile and precast pile

Abstract

The utility model relates to the technical field of reinforced concrete precast piles, in particular to a prestressed concrete four-eight variable core combined square pile and a precast pile, which comprise a square pile section and an eight-side pile section which are integrally arranged up and down and are solid, and the section circumferences of the square pile section and the eight-side pile section are equal; the whole combined square pile is connected with the bearing platform reinforcing steel bars through the threaded reinforcing steel bars and the threaded sleeves; first inner stirrups and first inner longitudinal bars are arranged in the square pile section, and the first inner stirrups are bound to the outer sides of the first inner longitudinal bars in a surrounding mode. Second inner stirrups and second inner longitudinal bars are arranged in the octagonal pile section, and the second inner stirrups are bound to the outer sides of the second inner longitudinal bars in a surrounding mode. The binding density of the first inner stirrup is smaller than that of the second inner stirrup. According to the utility model, the link of core concrete grouting 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 precast piles, in particular to a prestressed concrete four-eight variable core combined square pile and a precast 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] The existing Chinese patent document with application number 201921244850.0 discloses a variable-section prefabricated reinforced concrete solid pile. The pile body of the solid pile includes: a square pile section and a cross pile section that are integrally arranged up and down. And in the variable-section section, a design of pre-buried grouting pipes in the prefabricated pile body is adopted, which is used for grouting after the pile is formed to achieve the effect of improving the bearing capacity. Although the amount of concrete and steel bars can be reduced after the cross-section of this pile body is changed, the requirements for the formwork are high when producing this pile, and the concrete filling is not easy to be dense. Storage and hoisting are prone to collisions: it is difficult to meet the standard requirements in terms of appearance. The effect of the later grouting of the pre-buried pressure-drop pipe is different in different geological conditions, and the economic benefits are low. 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 four-eight variable core combined 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 4 / 8 variable core composite square pile, comprising a solid square pile section and an octagonal pile section, both of which are integrally arranged above and below, and have equal cross-sectional perimeters; the entire composite square pile is connected to the base steel bar via threaded steel bars and threaded sleeves;

[0010] The square pile segment is provided with a first inner stirrup and a first inner longitudinal reinforcement, and the first inner stirrup is tied around the outside of the first inner longitudinal reinforcement; the octagonal pile segment is provided with a second inner stirrup and a second inner longitudinal reinforcement, and the second inner stirrup is tied around the outside of the second inner longitudinal reinforcement; the binding density of the first inner stirrup is less than that of the second inner stirrup.

[0011] Furthermore, the combined square piles are friction piles.

[0012] A prestressed concrete precast pile, when the precast pile is a single pile, has a pile body made of the above-mentioned prestressed concrete 4:8 variable core combined square pile. The area at least 3 meters below the pile top is a square pile section.

[0013] When precast piles need to be connected at one time, the upper pile section adopts the above-mentioned prestressed concrete four-eight variable core composite square pile, and the lower pile section adopts a separate eight-sided pile section; the upper and lower pile sections are connected by threaded sleeves or welding.

[0014] When prefabricated piles need to be connected multiple times, the single piles connecting the pile tops use the above-mentioned prestressed concrete four-eight variable core composite square piles; multiple sections of eight-sided pile sections are connected below the composite square piles; the adjacent upper and lower sections of the piles are connected or welded using threaded sleeves.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] First, despite the reduced cross-sectional dimensions of the piles, the unique shape of the octagonal piles increases their contact area with the soil, effectively dissipating the pressure generated by the building's weight and reducing the risk of soil settlement and slippage. This design not only increases the structure's bearing capacity but also enhances its stability.

[0017] Secondly, the piles' horizontal lateral force resistance design meets specific requirements. In areas where resistance to horizontal forces is crucial, square piles with a larger cross-sectional moment of inertia are used. When horizontal forces decrease and reach weaker areas, octagonal cross-sections are used. This effectively reduces the amount of steel and concrete used, ensuring that every part of the pile is fully utilized.

[0018] 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 costs and shortening construction period. While saving labor costs, the construction process also becomes more convenient.

[0019] Finally, taking into account the influence of the designed pile length, combined with the geological report and structural calculation results, solid square piles and octagonal piles were combined and connected to meet actual needs, while ensuring that the horizontal and vertical bearing capacities were met. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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:

[0021] Figure 1 This is a schematic diagram of the prestressed concrete 4:8 variable core combined square pile of the present utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the utility model after assembly when pile connection is required;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the square pile segment 1-1 of the present invention;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of the octagonal pile segment 2-2 of the present invention;

[0025] Among them: 1. Square pile segment; 1a. First inner stirrup; 1b. First inner longitudinal reinforcement; 2. Octagonal pile segment; 2a. Second inner stirrup; 2b. Second inner longitudinal reinforcement; 3. Threaded sleeve. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] See also Figures 1 to 4This utility model provides a prestressed concrete 4 / 8 variable core composite square pile, comprising a solid, integrated upper and lower square pile section 1 and an octagonal pile section 2. While the cross-sectional perimeters of the two sections are equal, the octagonal pile provides a larger contact area with the soil, effectively distributing the pressure generated by the building's weight and reducing the risk of soil settlement and slippage. This design not only improves the structure's load-bearing capacity but also enhances its stability.

[0030] The entire composite square pile is connected to the base cap steel bars via threaded steel bars and threaded sleeves. The connection between the pile body steel bars and the base cap is achieved by rotating the threads. This section is prior art, and the structure of the threaded sleeve is described in detail in Patent Application No. 2024223159473, so it will not be repeated here.

[0031] The square pile segment 1 is provided with a first inner stirrup 1a and a first inner longitudinal reinforcement 1b, and the first inner stirrup is tied around the outside of the first inner longitudinal reinforcement; the octagonal pile segment 2 is provided with a second inner stirrup 2a and a second inner longitudinal reinforcement 2b, and the second inner stirrup is tied around the outside of the second inner longitudinal reinforcement; preferably, the binding density of the first inner stirrup 1a is less than that of the second inner stirrup 2a to meet the strength requirements of the octagonal pile segment 2.

[0032] The combined square pile is a friction type pile.

[0033] 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, the area at least 3 meters below the pile top is the square pile section 1, or this value can be determined based on the geological environment of the individual project and the depth of the silty soil. The pile top is selected according to the national standard atlas or the factory standard atlas.

[0034] When the length of a single combined square pile does not meet the design requirements and a single pile connection is required, the combined square pile is used as the upper pile section, and the separate octagonal pile section is used as the lower pile section. The upper and lower pile sections are connected or welded using a threaded sleeve 3. When multiple pile connections are required, multiple full octagonal pile sections can be connected below the combined square pile as needed. The adjacent upper and lower pile sections are connected or welded using a threaded sleeve 3.

[0035] 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 4:8 variable core composite square pile, characterized by: It includes a square pile section and an octagonal pile section that are both solid and integrally arranged above and below, and the cross-sectional perimeters of the two sections are equal; the entire combined square pile is connected to the base steel bar through threaded steel bars and threaded sleeves; The square pile segment is provided with a first inner stirrup and a first inner longitudinal reinforcement, and the first inner stirrup is tied around the outside of the first inner longitudinal reinforcement; the octagonal pile segment is provided with a second inner stirrup and a second inner longitudinal reinforcement, and the second inner stirrup is tied around the outside of the second inner longitudinal reinforcement; the binding density of the first inner stirrup is less than that of the second inner stirrup.

2. The prestressed concrete 4:8 variable core composite square pile according to claim 1, characterized in that: The combined square pile is a friction type pile.

3. A prestressed concrete precast pile, characterized by: When the prefabricated pile is a single pile, the pile body adopts the prestressed concrete 4:8 variable core composite square pile described in claim 1 or 2.

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

5. 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 four-eight variable core composite square pile described in claim 1 or 2, and the lower pile section adopts a separate eight-sided pile segment; the upper and lower pile sections are connected by threaded sleeves or welding.

6. 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 four-eight variable core composite square pile described in claim 1 or 2; multiple sections of full-length eight-sided pile sections are connected below the composite square pile; and adjacent upper and lower pile sections are connected or welded using threaded sleeves.

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