Precast column bottom joint shear reinforcement connection node device

Abstract

This utility model belongs to the technical field of precast concrete structure in building engineering. Specifically, it relates to a precast column bottom joint shear reinforcement connection node device, including a precast column, longitudinal reinforcement, grouting sleeve, metal corrugated pipe, additional shear reinforcement, guide reinforcement, and observation hole. A column bottom joint is reserved at the bottom of the precast column. The longitudinal reinforcement is connected through the grouting sleeve. The lower end of the additional shear reinforcement is embedded in the core area of ​​the beam and column, and the upper end passes through the metal corrugated pipe and communicates with the grouting sleeve. One shear reinforcement is extended to serve as a guide reinforcement, corresponding to the extension of the corrugated pipe and the provision of an observation hole. This utility model enhances the shear bearing capacity of the joint by adding shear reinforcement, achieves grouting anchorage through a connecting cavity, simplifies installation and alignment through the guide reinforcement, monitors grout density through the observation hole, and avoids reinforcement collision. It is suitable for connecting precast columns in assembled concrete structures.

Description

Technical Field

[0001] This utility model belongs to the field of precast concrete structure technology in building engineering, specifically, it relates to a precast column bottom joint shear reinforcement connection node device. Background Technology

[0002] In the construction of precast concrete structures, the connection joints of precast columns are critical parts of the structural stress, especially the shear resistance, reinforcement connection reliability, and grout density of the column bottom joints, which directly affect the overall structural safety. In existing technologies, the following problems often exist with the bottom joints of precast columns: 1. Insufficient shear bearing capacity: Traditional column base joint shear structure is difficult to meet the shear verification requirements of high seismic grade or large span structure, which can easily lead to cracking or damage at the joint; 2. Difficulty in anchoring shear reinforcement: The connection between shear reinforcement and precast columns is mostly achieved by direct pre-embedding or welding, which cannot achieve full-path anchoring through grouting, resulting in poor connection reliability; 3. Low installation alignment efficiency: When hoisting precast columns, it is difficult to accurately align the bottom reinforcement bars with the lower embedded reinforcement bars. In particular, the middle reinforcement bars at the bottom of the column are difficult to align due to obstructed view, which can easily lead to bending or damage of the reinforcement bars. 4. Uncontrollable grout density: The grouting condition of the grouting sleeve and the shear reinforcement connection cavity cannot be visually observed. It can only be judged by the grout outlet of the grouting sleeve, which is prone to local voids or incomplete compaction, affecting the connection performance. 5. Reinforcing bar collision interference: Shear reinforcement and longitudinal reinforcement of precast beams are prone to conflict, requiring adjustment of the reinforcement position or specifications, which increases the complexity of design and construction.

[0003] Therefore, there is an urgent need for a precast column bottom connection node device that can solve the above problems and take into account shear resistance, connection reliability, installation convenience and grouting controllability. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a precast column bottom joint shear reinforcement connection node device, which solves the technical problems of insufficient shear bearing capacity, difficulty in anchoring shear reinforcement, difficulty in installation alignment, uncontrollable grouting density, and reinforcement collision interference in existing precast column bottom joint connection nodes.

[0005] According to the present invention, a precast column bottom joint shear reinforcement connection node device includes a precast column, upper precast column longitudinal reinforcement, lower precast column longitudinal reinforcement, grouting sleeve, metal corrugated pipe, additional shear reinforcement, guide reinforcement, extended metal corrugated pipe and observation hole. A column bottom joint is reserved between the bottom of the precast column and the lower structure. The longitudinal reinforcement of the lower column penetrates the core area of ​​the beam and column and is connected to the longitudinal reinforcement of the upper precast column through the grouting sleeve. The grouting sleeve is provided with a grouting hole for inputting grout and a grouting outlet for discharging grout; The precast column has multiple corrugated metal pipes in the middle area at the bottom. The lower end of the additional shear reinforcement is embedded in the concrete of the core area of ​​the beam and column and anchored. The upper end is inserted into the corrugated metal pipe and connected to the precast column. The bottom of the corrugated metal pipe is connected to the grouting sleeve through the column bottom joint to form a grouting material flow cavity. One of the additional shear reinforcement bars is lengthened to form the guide bar, and the corresponding metal corrugated pipe is lengthened to form the extended metal corrugated pipe. The upper part of the extended metal corrugated pipe is provided with the observation hole for observing the grout density inside the metal corrugated pipe.

[0006] In a preferred embodiment: the height A of the precast column satisfies A=Hh-20, where H is the structural floor height, h is the beam height, and the actual height of the column bottom joint is ≥20mm.

[0007] In a preferred embodiment, the additional shear reinforcement is located at the intersection of the longitudinal reinforcement of the upper precast column in two directions.

[0008] In a preferred embodiment: the observation hole is made of PVC flexible tubing and is connected to the interior of the extended metal corrugated pipe.

[0009] In a preferred embodiment: when the additional shear reinforcement is embedded in the core concrete of the beam and column, it is fixed by a fixing steel plate.

[0010] In a preferred embodiment: the finished surface of the structure below the precast column has a rough surface in the area corresponding to the column cross-section, and the unevenness of the rough surface is ≥6mm.

[0011] In a preferred embodiment: the core area of ​​the beam and column is a cast-in-place concrete structure, the precast column is a fully precast structure, and the top height of the precast column reaches the bottom of the beam, and the bottom height reaches 20mm above the structural elevation.

[0012] In a preferred embodiment: the number of the corrugated metal pipes is the same as the number of the additional shear reinforcement bars, and each of the corrugated metal pipes is fitted one-to-one on the outer side of the upper end of one of the additional shear reinforcement bars.

[0013] In a preferred embodiment: the grout outlet is used to determine the grout fullness in the grouting sleeve by observing the overflow state of the grout, and the observation hole is used to determine the grout density in the metal corrugated pipe by observing the overflow state of the grout.

[0014] In a preferred embodiment: the guide bar is used to guide the precast column to be precisely aligned with the additional shear reinforcement and longitudinal reinforcement of the lower column in the lower structure.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention effectively meets the shear resistance calculation requirements and avoids joint cracking by combining additional shear reinforcement at the column base with grouting anchorage.

[0016] This invention solves the problem of difficult anchoring of shear reinforcement by connecting a metal corrugated pipe to a grouting sleeve and filling the entire path with grout.

[0017] This invention solves the problem of poor alignment of the reinforcing bars at the bottom center of the column by using guide bars in conjunction with extended corrugated metal pipes, thereby improving hoisting efficiency.

[0018] This invention uses both observation holes and grout outlet holes for dual monitoring, allowing for intuitive judgment of the grouting situation and avoiding voids or incomplete compaction.

[0019] This invention reduces construction complexity by placing shear-resistant steel bars at the intersection of longitudinal reinforcement bars, eliminating the need to adjust the original beam and column reinforcement design. Attached Figure Description

[0020] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 For the present utility model Figure 1 Sectional view of section 1-1.

[0021] The following are the labeling elements in the figure: 1. Precast column; 2. Upper precast column longitudinal reinforcement; 3. Lower column longitudinal reinforcement; 4. Grouting sleeve; 5. Grout outlet hole; 6. Grouting hole; 7. Column bottom joint; 8. Shear reinforcement; 9. Corrugated metal pipe; 10. Extended corrugated metal pipe; 11. Observation hole; 12. Guide bar. Detailed Implementation

[0022] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0023] This utility model discloses a precast column bottom joint shear reinforcement connection node device, including a precast column 1, upper precast column longitudinal reinforcement 2, lower column longitudinal reinforcement 3, grouting sleeve 4, metal corrugated pipe 9, shear reinforcement 8, guide reinforcement 12, extended metal corrugated pipe 10, and observation hole 11.

[0024] Precast column 1 is a fully precast structure, with its top height reaching the bottom of the beam. A column bottom joint 7 is reserved between the bottom and the lower structure, with a joint height ≥20mm. Based on the structural floor height H and beam height h, the height A of precast column 1 is calculated as Hh-20. The fully precast column 1 is fabricated to ensure compatibility with the beam and the lower structure.

[0025] The lower column longitudinal reinforcement 3 penetrates the core area of ​​the cast-in-place beam and column, and is connected to the upper precast column longitudinal reinforcement 2 through the grouting sleeve 4; the grouting sleeve 4 is provided with a grouting hole 6 and a grout outlet hole 5. The grouting hole 6 is used to input grouting material, and the grout outlet hole 5 is used to discharge grouting material. The grouting hole 6 is located above the grout outlet hole 5, allowing the grouting sleeve 4 to judge the fullness of the sleeve grouting through the overflow of grout from the grout outlet hole 5; Multiple corrugated metal pipes 9 are installed in the middle area at the bottom of the precast column 1. The lower end of the shear reinforcement 8 is embedded in the concrete of the core area of ​​the beam and column and is fixed by a fixing steel plate to prevent displacement. The upper end of the shear reinforcement 8 is inserted into the corrugated metal pipe 9. The bottom of the corrugated metal pipe 9 is connected to the grouting sleeve 4 through the column bottom joint 7 to form a grouting material flow cavity, thereby realizing the grouting anchorage of the shear reinforcement.

[0026] One of the multiple shear-resistant steel bars 8 is extended to become a guide bar 12. The guide bar 12 is extended to become an extended metal corrugated pipe 9. An observation hole 11 made of PVC flexible material is provided on the upper part of the extended metal corrugated pipe 10. During hoisting, the precast column is accurately installed by aligning the guide bar 12 with the extended metal corrugated pipe 10. During grouting, the grout overflow in the metal corrugated pipe is used to judge the grout density.

[0027] Shear reinforcement 8 is placed at the intersection of the longitudinal reinforcement 2 of the upper precast column in two directions to avoid collision and interference with the longitudinal reinforcement of the precast beam; the finished column section of the lower structure is provided with a rough surface with concavity and convexity ≥6mm to improve the joint bonding performance.

[0028] Working principle Before pouring concrete in the core area of ​​the beam and column, this utility model determines the quantity, diameter, length, and arrangement of additional shear reinforcement bars according to the design. The lower end of the additional shear reinforcement bars is pre-embedded in the reinforcement skeleton of the core area of ​​the beam and column and fixed with a fixing steel plate to prevent displacement during concrete vibration. At the same time, an additional shear reinforcement bar is selected and extended to form a guide bar. Then, the entire layer of concrete is poured to the finished surface of the structure. A rough surface with an unevenness of not less than 6mm is reserved on the finished surface of the column section to improve the joint bonding performance. After the concrete strength reaches the design requirements, an elevation shim is placed at the bottom joint of the column to control the joint height to not less than 20mm. Then, the precast column is hoisted to 1m above the structural elevation and slowly lowered. The precast column is guided to fall by the priority alignment of the guide bar and the extended metal corrugated pipe, so that all grouting sleeves are precisely aligned with the longitudinal reinforcement of the lower column, and the metal corrugated pipe is precisely aligned with the additional shear reinforcement bars until the precast column falls on the shim and the joint height is checked to meet the requirements before fixing. Finally, grouting is carried out. Only one grouting port is left in the grouting sleeve section. Grout is injected into the grouting port. After a few seconds of uniformly flowing cylindrical grout from the outlet of the grouting sleeve, the outlet is sealed. This process is repeated until all outlets are sealed. Grouting continues while observing the observation hole. After a few seconds of cylindrical grout flowing from the observation hole, the observation hole is sealed. Grouting continues for a few seconds, then stops and the grouting port is sealed. At this point, the grout fills the cavity formed by the grouting sleeve and the corrugated metal pipe at the column bottom joint, achieving a reliable connection between the longitudinal reinforcement of the upper and lower precast columns and the grouting anchorage of the additional shear reinforcement. After the strength of the grout test blocks cured under the same conditions reaches the design requirements, the installation and function of the entire node device are completed. This ensures both the shear bearing capacity of the column bottom joint and the ease of installation and controllability of grout density.

[0029] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A precast column base joint shear reinforcement connection node device, characterized by, It includes precast columns (1), upper precast column longitudinal reinforcement (2), lower column longitudinal reinforcement (3), grouting sleeve (4), metal corrugated pipe (9), additional shear reinforcement (8), guide reinforcement (12), extended metal corrugated pipe (10) and observation hole (11). The bottom of the precast column (1) is reserved with a column bottom joint (7) between the bottom and the lower structure. The longitudinal reinforcement (3) of the lower column penetrates the core area of ​​the beam and column and is connected to the longitudinal reinforcement (2) of the upper precast column through the grouting sleeve (4). The grouting sleeve (4) is provided with a grouting hole (6) for inputting grout and a grout outlet (5) for discharging grout. The precast column (1) has multiple corrugated metal pipes (9) in the middle area at the bottom. The lower end of the additional shear steel bar (8) is pre-embedded in the concrete of the core area of ​​the beam and column and anchored. The upper end is inserted into the corrugated metal pipe (9) and connected to the precast column (1). The bottom of the corrugated metal pipe (9) is connected to the grouting sleeve (4) through the column bottom joint (7) to form a grouting material flow cavity. One of the additional shear reinforcement bars (8) is lengthened to form the guide bar (12), and the metal corrugated pipe (9) corresponding to the guide bar (12) is lengthened to form the extended metal corrugated pipe (10). The upper part of the extended metal corrugated pipe (10) is provided with the observation hole (11) for observing the grout density inside the metal corrugated pipe.

2. The precast column bottom joint shear reinforcement connection device according to claim 1, characterized in that, The height A of the precast column (1) satisfies A=Hh-20, where H is the structural floor height and h is the beam height, and the actual height of the column bottom joint (7) is ≥20mm.

3. The precast column bottom joint shear reinforcement connection device according to claim 1, characterized in that, The additional shear reinforcement (8) is located at the intersection of the longitudinal reinforcement (2) of the upper precast column in two directions.

4. The precast column bottom joint shear reinforcement connection device according to claim 1, characterized in that, The observation hole (11) is made of PVC flexible hose and is connected to the inside of the extended metal corrugated pipe (10).

5. The precast column bottom joint shear reinforcement connection device according to claim 1, characterized in that, When the additional shear reinforcement (8) is embedded in the concrete of the core area of ​​the beam and column, it is fixed by a fixing steel plate.

6. The precast column bottom joint shear reinforcement connection device according to claim 1, characterized in that, In the structural completion surface below the precast column (1), a rough surface is provided in the area corresponding to the column cross-section range, and the unevenness height of the rough surface is ≥6mm.

7. The precast column bottom joint shear reinforcement connection device according to claim 1, characterized in that, The core area of ​​the beam and column is a cast-in-place concrete structure, the precast column (1) is a fully precast structure, and the top height of the precast column (1) reaches the bottom of the beam, and the bottom height reaches 20mm above the structural elevation.

8. The precast column bottom joint shear reinforcement connection device according to claim 1, characterized in that, The number of the corrugated metal pipes (9) is the same as the number of the additional shear reinforcement bars (8), and each corrugated metal pipe (9) is fitted one-to-one on the outer side of the upper end of one of the additional shear reinforcement bars (8).

9. The precast column bottom joint shear reinforcement connection device according to claim 1, characterized in that, The grout outlet (5) is used to determine the grout fullness in the grouting sleeve (4) by observing the overflow state of the grout, and the observation hole (11) is used to determine the grout density in the metal corrugated pipe (9) by observing the overflow state of the grout.

10. The precast column bottom joint shear reinforcement connection device according to claim 1, characterized in that, The guide bar (12) is used to guide the precast column (1) to be precisely aligned with the additional shear reinforcement (8) and the longitudinal reinforcement (3) of the lower column in the lower structure.

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