Cast-in-place pile reinforcement cage and cast-in-place pile

Abstract

The utility model discloses an improved cast-in-situ bored pile reinforcement cage, which is favorable for reducing the upward floating phenomenon of the reinforcement cage during concrete pouring. Comprising a reinforcement cage body, a main reinforcement extension section is arranged at the lower end of the reinforcement cage body, a spiral stirrup or a spiral tie bar is arranged at the lower end of the main reinforcement extension section, and a spiral shaft of the spiral stirrup or the spiral tie bar and the reinforcement cage body are coaxially arranged. One part of the spiral stirrup or the spiral tie bar is located on the main bar extension section, and the other part of the spiral stirrup or the spiral tie bar extends to the position below the main bar extension section to form an elastic buffering anchoring structure capable of stretching and retracting in the axial direction. The axial force, acting on the elastic buffering and anchoring structure, of the concrete grout surface enables the elastic buffering and anchoring structure to generate certain axial shrinkage, and therefore the axial force, acting on the elastic buffering and anchoring structure, of the concrete grout surface is absorbed. The spiral stirrups or the spiral tie bars form an anchoring structure, and certain downward pulling force can be applied to the reinforcement cage body.

Description

Technical Field

[0001] The utility model relates to a bored cast-in-place pile reinforcement cage and a bored cast-in-place pile. Background Art

[0002] Bored piles refer to piles made by forming pile holes in the foundation soil by mechanical drilling, steel pipe squeezing or manual excavation at the construction site, placing steel cages in the piles, and pouring concrete. At present, in the process of bored pile construction, the phenomenon of steel cages floating up when pouring concrete often occurs. The steel cages float up from a few centimeters to more than ten centimeters, and sometimes float up dozens of centimeters or even more than a meter. So far, there are very few projects where all bored piles of a project have not experienced steel cages floating up. The degree of steel cage floating has different effects on the use value of bored piles. Slight floating generally does not affect the use value of bored piles, but excessive floating of the steel cage will lead to quality defects of the pile concrete and insufficient steel protection layer. There are many factors that lead to the floating of the steel cage when pouring concrete. At present, the floating of the steel cage is mainly reduced in the preparation of concrete and the concrete pouring process. Utility Model Content

[0003] The utility model aims to provide an improved bored pile reinforcement cage, which helps to alleviate the floating phenomenon of the reinforcement cage when pouring concrete.

[0004] To this end, in the first aspect, a bored cast-in-place pile reinforcement cage is provided, comprising a reinforcement cage body, a main reinforcement extension section is arranged at the lower end of the reinforcement cage body, a spiral stirrup or a spiral tie bar is arranged at the lower end of the main reinforcement extension section, the spiral axis of the spiral stirrup or the spiral tie bar is coaxially arranged with the reinforcement cage body, a part of the spiral stirrup or the spiral tie bar is located on the main reinforcement extension section and the other part extends to the bottom of the main reinforcement extension section to form an axially retractable elastic buffer anchoring structure.

[0005] According to an embodiment of the present application, the main reinforcement extension section is composed of a plurality of longitudinal reinforcements respectively overlapped with the lower ends of some main reinforcements in the reinforcement cage body.

[0006] According to an embodiment of the present application, the main reinforcement extension section is composed of a plurality of longitudinal reinforcements respectively integrated with part of the main reinforcements in the reinforcement cage body.

[0007] According to an embodiment of the present application, the length of the main reinforcement extension section is such that the lower end of the elastic buffer anchoring structure reaches or is close to the bottom of the bored pile hole.

[0008] According to an embodiment of the present application, in the spiral stirrups or the spiral tension bars, the axial length of the elastic buffer anchoring structure is more than twice the axial length of the portion located on the main reinforcement extension section.

[0009] In a second aspect, a bored pile is provided, comprising a bored pile reinforcement cage, wherein the bored pile reinforcement cage adopts the bored pile reinforcement cage of the first aspect.

[0010] The main reinforcement of the steel cage body is extended downward by the main reinforcement extension section. At the same time, a part of the spiral stirrup or the spiral tension bar is located on the main reinforcement extension section and the other part extends to the bottom of the main reinforcement extension section to form an axially retractable elastic buffer anchoring structure. In this way, when concrete grouting is carried out, as the concrete slurry surface gradually rises from the bottom of the bored pile hole, when it reaches the elastic buffer anchoring structure, since the elastic buffer anchoring structure is similar to a spring, the axial force of the concrete slurry surface acting on the elastic buffer anchoring structure causes the elastic buffer anchoring structure to produce a certain axial contraction, thereby absorbing the axial force of the concrete slurry surface acting on the elastic buffer anchoring structure, thereby reducing the floating of the steel cage. When the concrete slurry surface submerges the spiral stirrup or the spiral tension bar, the spiral stirrup or the spiral tension bar (including the elastic buffer anchoring structure) forms an anchoring structure. In this way, when the concrete slurry surface rises to the lower end of the steel cage body, the anchoring structure can exert a certain downward pulling force on the steel cage body to further prevent the steel cage body from floating.

[0011] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings constituting a part of this specification are used to assist the understanding of the present invention. The contents provided in the drawings and the related descriptions in this specification can be used to explain the present invention, but do not constitute an improper limitation on the present invention.

[0013] Figure 1 The present invention is a schematic structural diagram of a bored cast-in-place pile reinforcement cage according to an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The utility model is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the utility model based on these descriptions. Before describing the utility model in conjunction with the accompanying drawings, it should be particularly noted that:

[0015] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0016] The embodiments of the utility model involved in the following description are usually only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0017] Regarding the terms and units in this specification: The terms "include", "comprises", "have" and any variations thereof in this specification and the corresponding claims and related parts are intended to cover non-exclusive inclusions. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0018] Figure 1 This is a schematic diagram of the structure of a bored pile reinforcement cage according to an embodiment of the utility model. Figure 1 As shown, a bored pile reinforcement cage comprises a reinforcement cage body 11, a main reinforcement extension section 12 is arranged at the lower end of the reinforcement cage body, a spiral stirrup 13 or a spiral tie bar is arranged at the lower end of the main reinforcement extension section 12, the spiral axis of the spiral stirrup 13 or the spiral tie bar is coaxially arranged with the reinforcement cage body, a part of the spiral stirrup 13 or the spiral tie bar is located on the main reinforcement extension section 12 and the other part extends to the bottom of the main reinforcement extension section 12 to form an axially retractable elastic buffer anchoring structure 14. In this embodiment, the spiral stirrup 13 is used instead of the spiral tie bar.

[0019] The main reinforcement extension section may be composed of a plurality of longitudinal reinforcements respectively overlapped with the lower ends of some main reinforcements in the reinforcement cage body 11. The main reinforcement extension section 12 may also be composed of a plurality of longitudinal reinforcements respectively integrated with some main reinforcements in the reinforcement cage body 11.

[0020] Generally speaking, the length of the main reinforcement extension section 12 is such that the lower end of the elastic buffer anchoring structure reaches or approaches the bottom of the bored pile hole. The length of the main reinforcement extension section 12 is generally 3 meters to 6 meters.

[0021] Generally speaking, in the spiral stirrups or the spiral tension bars, the axial length of the elastic buffer anchoring structure is more than one time the axial length of the portion located on the main reinforcement extension section.

[0022] The main reinforcement of the steel cage body 11 is extended downward by the main reinforcement extension section 12. At the same time, a part of the spiral stirrup 13 or the spiral tie bar is located on the main reinforcement extension section 12 and the other part extends to the bottom of the main reinforcement extension section 12 to form an axially retractable elastic buffer anchor structure 14. In this way, when concrete grouting is performed, as the concrete slurry surface gradually rises from the bottom of the bored pile hole, when it reaches the elastic buffer anchor structure 14, since the elastic buffer anchor structure 14 is similar to a spring, the concrete slurry surface acts on the elastic buffer anchor structure 14. The axial force causes the elastic buffer anchoring structure 14 to produce a certain axial contraction, thereby absorbing the axial force of the concrete slurry surface acting on the elastic buffer anchoring structure 14, thereby reducing the floating of the steel cage. When the concrete slurry surface submerges the spiral stirrups 13 or the spiral tension bars, the spiral stirrups 13 or the spiral tension bars (including the elastic buffer anchoring structure 14) form an anchoring structure. In this way, when the concrete slurry surface rises to the lower end of the steel cage body 11, the anchoring structure can exert a certain downward pulling force on the steel cage body, further preventing the steel cage body 11 from floating.

[0023] The bored pile includes a bored pile reinforcement cage, and the bored pile reinforcement cage adopts the above-mentioned bored pile reinforcement cage. At this time, the structural design of the above-mentioned bored pile reinforcement cage can also improve the bearing capacity and seismic resistance of the bored pile. Through the arrangement of the main reinforcement extension section and the spiral stirrups 13 or spiral tension bars, the concrete area and strength of the pile end are enhanced, and the bearing capacity of the pile end is improved. In particular, the restraining effect of the spiral stirrups 13 or the spiral tension bars further improves the mechanical properties of the concrete at the pile end, so that the bearing capacity of the pile end is fully exerted. The elastic buffer anchoring structure gives the pile end a certain flexibility and adaptability. When encountering dynamic loads such as earthquakes, the elastic buffer anchoring structure can buffer and dissipate seismic energy through elastic deformation, reduce the destructive effect of the earthquake on the pile body, and improve the seismic resistance of the pile foundation.

[0024] The above is a description of the relevant contents of the utility model. A person skilled in the art will be able to implement the utility model based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of patent protection.

Claims

1. A bored pile reinforcement cage, comprising a reinforcement cage body, characterized in that: A main reinforcement extension section is arranged at the lower end of the reinforcement cage body, and a spiral stirrup or a spiral tie rod is arranged at the lower end of the main reinforcement extension section. The spiral axis of the spiral stirrup or the spiral tie rod is arranged coaxially with the reinforcement cage body. A part of the spiral stirrup or the spiral tie rod is located on the main reinforcement extension section and the other part extends to the bottom of the main reinforcement extension section to form an axially retractable elastic buffer anchoring structure.

2. The bored pile reinforcement cage according to claim 1, characterized in that: The main reinforcement extension section is composed of a plurality of longitudinal reinforcements which are respectively overlapped with the lower ends of some main reinforcements in the reinforcement cage body.

3. The bored pile reinforcement cage according to claim 1, characterized in that: The main reinforcement extension section is composed of a plurality of longitudinal reinforcements which are respectively integrated with part of the main reinforcements in the reinforcement cage body.

4. The bored pile reinforcement cage according to claim 1, characterized in that: The length of the main reinforcement extension section enables the lower end of the elastic buffer anchoring structure to reach or approach the bottom of the bored pile hole.

5. The bored pile reinforcement cage according to claim 1, characterized in that: In the spiral stirrup or the spiral tension reinforcement, the axial length of the elastic buffer anchoring structure is more than one times the axial length of the portion located on the main reinforcement extension section.

6. Bored piles, including bored pile reinforcement cages, characterized in that: The bored pile reinforcement cage adopts the bored pile reinforcement cage as claimed in any one of claims 1 to 5.

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