Encryption section stirrup structure of large-diameter cast-in-place pile reinforcement cage

Abstract

A large-diameter cast-in-place pile reinforcement cage densification section stirrup structure is characterized in that a pile body main reinforcement, a spiral stirrup and a stiffening hoop are arranged on a cast-in-place pile reinforcement cage densification section, the inner square hoop (2) is a square reinforcement hoop, the diameter of the inner square hoop is matched with that of the spiral hoop, and the inner square hoop and the spiral hoop are matched to form a composite spiral hoop structure of the reinforcement cage densification section (1); the load bearing capacity of the large-diameter cast-in-place pile is improved; wherein the main reinforcements (5) are longitudinal reinforcements. The longitudinal bars are uniformly arranged between the inner-layer spiral hoop and the outer-layer spiral hoop at intervals, the inner square hoop is arranged between the outer-layer spiral hoops (4), stiffening hoops (3) are arranged on the reinforcement cage every 2 m, and a guide pipe (6) is arranged in the center of the inner square hoop (2) when the reinforcement cage is used. The reinforcement cage densification section stirrup structure of the large-diameter cast-in-place pile has the advantages that the load capacity of the large-diameter cast-in-place pile is improved, lowering of the guide pipe is guaranteed, the pouring quality of the cast-in-place pile is guaranteed, construction is easy and convenient, operation is easy, and installation is firm and stable.

Description

Technical Field

[0001] The invention belongs to the technical field of geotechnical engineering pile foundations, and in particular relates to a stirrup structure of a reinforced cage densified section of a large-diameter cast-in-place pile. Background Art

[0002] With the rapid development of the national economy, the construction of bridges, docks, subways, and other projects is increasing, placing higher demands on the stability and reliability of building foundations. Large-diameter, extra-long cast-in-place piles, a common and important form of foundation reinforcement, are widely used in various geotechnical construction projects due to their simple, mature construction process and low cost. However, these large-diameter cast-in-place piles have limited load-bearing capacity due to the structural limitations of the reinforcement. This often requires additional longitudinal reinforcement, which wastes materials, increases the difficulty of rebar installation, and results in high labor and material costs.

[0003] Therefore, there are the above-mentioned various inconveniences and problems in the known large-diameter and super-long cast-in-place pile reinforcement installation form. Summary of the Invention

[0004] The purpose of the present invention is to provide a safe and reliable large-diameter cast-in-place pile reinforcement cage densification section stirrup structure.

[0005] To achieve the above objectives, the technical solution of the present invention is: A stirrup structure for a reinforced cage densification section of a large-diameter cast-in-place pile, wherein the reinforced cage densification section of the cast-in-place pile is provided with pile body main reinforcement, spiral stirrups, and reinforcing hoops, including inner square hoops, and is characterized by: The inner square hoop is a square steel hoop with the same diameter as the spiral hoop. The inner square hoop and the spiral hoop cooperate to form a composite spiral hoop structure of the steel cage densification section, thereby improving the load-bearing capacity of the large-diameter cast-in-place pile. The main reinforcement is the longitudinal reinforcement. The longitudinal reinforcement is evenly spaced between the inner and outer spiral hoops. The inner square hoop is set between the outer spiral hoops. A reinforcing hoop is set every 2m in the steel cage. When in use, a guide tube is set in the center of the inner square hoop.

[0006] The stirrup structure of the densified section of the large-diameter cast-in-place pile reinforcement cage of the present invention can be further realized by adopting the following technical measures.

[0007] The aforementioned large-diameter cast-in-place pile reinforcement cage densification section stirrup structure, wherein the four corners of the inner square stirrup and the main reinforcement are firmly fixed by electric spot welding or tied with wire.

[0008] After adopting the above technical solution, the stirrup structure of the reinforced cage densification section of the large-diameter cast-in-place pile of the present invention has the following advantages: 1. Improve the load-bearing capacity of large-diameter cast-in-place piles; 2. Ensure the lowering of the guide tube during the construction of bored piles to ensure the quality of bored pile casting; 3. The reinforced stirrup structure of the densified section is simple to construct, easy to operate, firmly installed and has sufficient stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of a cast-in-place pile reinforcement cage according to an embodiment of the present invention; Figure 2 It is a schematic cross-sectional view of the densified section of the cast-in-place pile reinforcement cage according to an embodiment of the present invention. DETAILED DESCRIPTION

[0010] The present invention will be further described below with reference to the embodiments and the accompanying drawings.

[0011] Example 1 Please refer to Figure 1 and Figure 2 The invention provides a large-diameter cast-in-place pile reinforcement cage densification section hoop reinforcement structure, wherein the cast-in-place pile reinforcement cage densification section is provided with pile body main reinforcement, spiral hoop reinforcement, and reinforcing hoop, including an inner square hoop.

[0012] The inner square hoop 2 is a square steel hoop with the same diameter as the spiral hoop. The inner square hoop and the spiral hoop cooperate to form a composite spiral hoop structure of the steel cage densification section 1 to improve the load-bearing capacity of the large-diameter cast-in-place pile. The main reinforcement 5 is longitudinal. The longitudinal reinforcement is evenly spaced between the inner and outer spiral hoops. The inner square hoop is positioned between the outer spiral hoops 4. A reinforcing hoop 3 is installed every 2 meters in the steel cage. When in use, a guide tube 6 is installed in the center of the inner square hoop 2. The four corners of the inner square hoop are securely connected to the main reinforcement using spot welding or tying with wire.

[0013] Example 2 The manufacturing process of the stirrup structure of the reinforced cage densification section of the large-diameter cast-in-place pile of the present invention includes: cutting the reinforced cage, coiling the stirrups → manufacturing the reinforced cage skeleton → installing the inner square hoop → installing the spiral stirrups → forming the reinforced cage densification section of the cast-in-place pile.

[0014] The construction method of the stirrup structure of the large-diameter cast-in-place pile reinforcement cage densification section of the present invention: 1. Cutting of steel cage and stirrup wire rod The longitudinal reinforcement of the steel cage, the cutting and welding of the reinforcing hoops, the coiling of the hoops, and the production of the inner square hoops are completed. After passing the inspection, they begin to be assembled.

[0015] 2. Steel cage skeleton production A reinforcing hoop is set up every 2m, and a sleeper is placed under the reinforcing hoop. The sleepers must be laid on a flat ground. After arranging them, the longitudinal bars are welded to the reinforcing bars at the specified spacing to ensure the straightness of the steel cage skeleton. The control lines (longitudinal bar control longitudinal line, stirrup control horizontal line) pre-drawn on the assembly site are used to arrange the first longitudinal bar according to the longitudinal bar control longitudinal line (the longitudinal bars and the reinforcing hoop have their contact points marked with chalk), and the reinforcing hoops are arranged according to the stirrup control horizontal line and welded to the main bars firmly. Then, the second main bar is set by manual rolling. The spacing and straightness of these two main bars must meet the design and specification requirements, and the remaining longitudinal bars are installed in sequence.

[0016] 3.Installation of inner square hoop Put the finished inner square hoop onto the steel cage frame according to the spacing requirements of the design drawings.

[0017] 4. Installation of spiral stirrups After the cage frame is completed and inspected, stirrups are installed. The stirrups are pre-bent into wire rods using a winch. During installation, the cage frame is hoisted slightly higher using a crane, and the stirrups are threaded through the frame. Stirrups are then distributed from the center of the frame toward the ends, following the stirrup welding points marked on the main bars. A custom fork-type wrench is then used to support and compress the main bars, ensuring close contact between the stirrups and the main bars. Finally, they are secured with spot welding (or tied with wire).

[0018] 5. Forming of reinforced section of steel cast-in-place pile cage The finished steel cage should be labeled (including the corresponding pile hole number, length, status identification, etc.). At the same time, after the team self-inspects and passes the self-inspection, it will be re-inspected by the quality inspection and technical personnel of the project department. After passing the re-inspection, the owner and supervisor will be organized to conduct inspection and acceptance.

[0019] The present invention possesses substantial advantages and represents a significant technological advancement. The stirrup structure for the reinforced cage section of a large-diameter cast-in-place pile is an improvement to the reinforced cage section of the cast-in-place pile. In addition to the existing spiral hoops in the reinforced cage section, inner square hoops are added with the same spacing and diameter as the spiral hoops. This combination forms a "composite spiral hoop" structure (spiral hoops plus inner square hoops). This effectively enhances the bearing capacity of the cast-in-place pile while ensuring the smooth lowering of the guide tube during cast-in-place pile construction, thus ensuring cast-in-place pile quality. Compared to conventional methods, the reinforced cage stirrups of cast-in-place piles are solely spiral hoops. However, for large-diameter cast-in-place piles that need to withstand heavy loads, using only spiral hoops in the reinforced cage section is insufficient, requiring an increase in the diameter of the longitudinal reinforcement. The present invention replaces the spiral hoops in the reinforced cage section with a composite spiral hoop structure (spiral hoops plus inner square hoops). This not only improves the load-bearing capacity of large-diameter cast-in-place piles without increasing the longitudinal reinforcement, but also ensures the smooth lowering of the guide tube during cast-in-place pile construction, thus ensuring cast-in-place pile quality.

[0020] The stirrup structure of the densified section of the large-diameter cast-in-place pile reinforcement cage of the present invention has been put into practical use in the pile foundation engineering of the Guangzhou Convention and Exhibition Center project. It is simple to construct, easy to operate, firmly installed, has sufficient stability, good quality, a wide range of applications, and is easy to promote and use. It has been unanimously recognized by the supervision unit and the construction unit, and has been welcomed by the operating personnel, achieving good economic benefits and social impact.

[0021] The above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Persons skilled in the art may make various modifications or variations without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions are intended to fall within the scope of the present invention and are defined by the claims.

Claims

1. A stirrup structure for a reinforced cage densification section of a large-diameter cast-in-place pile, wherein the reinforced cage densification section of the cast-in-place pile is provided with pile body main reinforcement, spiral stirrups, and reinforcing hoops, including inner square hoops, characterized in that: The inner square hoop (2) is a square steel hoop, the diameter of the inner square hoop is the same as the spiral hoop, and the inner square hoop and the spiral hoop cooperate to form a composite spiral hoop structure of the steel cage densification section (1), so as to improve the load-bearing capacity of the large-diameter cast-in-place pile; Wherein: the main reinforcement (5) is a longitudinal reinforcement.

2. The longitudinal reinforcement is evenly spaced between the inner and outer spiral hoops. The inner square hoop is arranged between the outer spiral hoops (4). A reinforcing hoop (3) is set up every 2m in the steel cage. When in use, a guide tube (6) is provided at the center of the inner square hoop (2).

3. The large diameter cast-in-place pile reinforcement cage densification section stirrup structure according to claim 1, characterized in that: The four corners of the inner square hoop are firmly fixed to the main reinforcement by electric spot welding or tied with wire.

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