Steel joint for prefabricated columns and prefabricated columns as well as prefabricated columns and cast-in-place columns
The welding connection method using steel joint devices solves the problem of the complex connection process between precast and cast-in-place columns, improves connection quality and construction efficiency, and ensures the stability and safety of the building structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-08
- Publication Date
- 2026-03-17
AI Technical Summary
The existing sleeve grouting connection method is cumbersome and inefficient, the connection quality between the precast column and the main structure is difficult to guarantee, the construction efficiency is low and there are safety hazards.
Steel joint devices are used to connect precast columns with each other and precast columns with cast-in-place columns by welding. The steel joint body and side plate structure, combined with longitudinal reinforcement and shear anchor rods, improve the connection stability and construction efficiency.
This achieves a stable connection between precast and cast-in-place columns, improves construction efficiency, ensures connection quality and safety, and reduces construction costs.
Smart Images
Figure CN224002091U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of prefabricated building technology, and more specifically to a steel joint for precast columns and cast-in-place columns. Background Technology
[0002] With the acceleration of urbanization in my country, prefabricated building technology is being increasingly applied. Compared with traditional cast-in-place concrete structures, prefabricated buildings offer advantages such as high production efficiency, short construction cycles, minimal environmental impact, environmental friendliness, ease of factory production of building components, centralized mass production, and guaranteed component quality. Prefabricated buildings mainly include prefabricated concrete structures, steel structures, and modern timber structures. The main components of prefabricated concrete structures include prefabricated reinforced concrete columns, prefabricated reinforced concrete beams, prefabricated floor slabs, prefabricated walls, and prefabricated stairs. The connection structure of prefabricated columns is a critical part between them, especially when they undergo elasto-plastic deformation under strong earthquakes; the splicing structure plays a crucial role in ensuring the integrity and stability of the prefabricated columns.
[0003] Currently, most precast reinforced concrete columns are fully precast, with the splicing of upper and lower columns primarily relying on sleeve grouting technology. Specifically, before the precast column is hoisted into place, anchor bars need to be pre-embedded at the installation location of the main structure, and grouting sleeves need to be pre-embedded at corresponding positions at the bottom of the precast column. After hoisting, the sleeve is fitted onto the anchor bars, ensuring the bars are vertically centered within the sleeve. Then, pressure grouting is performed using specialized grouting material to fill the gap between the sleeve and the anchor bars. The high strength of the grouting material ensures a stable connection between the precast column and the main structure.
[0004] However, this process presents numerous problems in actual construction. First, the anchoring bars undergo multiple steps during pre-embedding, including binding and fixing, and concrete vibration. Due to various factors, their position is highly susceptible to shifting. This makes it difficult to accurately fit the pre-embedded sleeves of the precast columns into the anchoring bars and ensure their centering, thus affecting the installation quality and construction efficiency of the precast columns. Second, the gap between the anchoring bars and the grouting sleeves is small (typically 8-12mm). If the anchoring bar's position deviates, the gap between the bar and the inner wall of the sleeve can easily decrease or even come into direct contact, preventing sufficient connection through grouting and reducing connection strength. Furthermore, when a large number of anchoring bars deviate beyond the allowable range, it severely weakens the connection strength between the vertical components and the main structure, posing a serious safety hazard to the overall construction quality of the main structure. Third, the process acceptance lacks visibility. After the precast vertical components are in place, it is impossible to visually determine from the outside whether the anchoring bars are vertically centered, and it is difficult to determine whether the gap width is uniform and meets the grouting requirements. Only after the grout has been filled can the joint quality at the connection point be inspected using specialized testing equipment. If any defects are found, only reinforcement remedial measures can be taken, which is not only time-consuming and labor-intensive, but also makes it difficult to guarantee quality. Finally, due to positional deviations between the anchor bars and the grouting sleeves of the precast concrete column components, the precast concrete column components are difficult to position smoothly. Frequent corrections of the anchor bar positions are required during installation, leading to a significant reduction in construction efficiency.
[0005] In summary, the existing sleeve grouting connection method has drawbacks such as cumbersome connection process and low efficiency, making it difficult to achieve a stable and reliable connection between precast columns.
[0006] Therefore, ensuring the connection quality between precast column components and the main structure, and guaranteeing the construction quality of the main structure, are crucial issues that professionals in this field urgently need to address. Furthermore, improving construction efficiency, reducing construction difficulty, and lowering construction costs while maintaining structural quality are also pressing problems. Utility Model Content
[0007] In view of this, the present invention provides a steel joint for precast columns and precast columns, and for cast-in-place columns, in order to solve the above-mentioned technical problems.
[0008] To achieve the above objectives, the present invention adopts the following technical solution:
[0009] A steel joint for connecting precast columns with each other and precast columns with cast-in-place columns, for connecting precast upper columns and precast lower columns; comprising two steel joint bodies respectively connected to the mating end faces of the precast upper column and the precast lower column;
[0010] The steel joint body consists of a base plate and four side plates. The base plates of the two steel joint bodies are respectively anchored to the end faces of the precast upper column and the precast lower column, so that the side plates of the two steel joint bodies correspond along their edges and are welded and fixed to achieve the docking of the precast upper column and the precast lower column.
[0011] Through the above technical solution, this utility model adopts a welding connection method to connect columns, and provides a novel connection device for precast columns to precast columns and precast columns to cast-in-place columns, effectively solving the problems of complex processes, low construction efficiency, and insufficient shear resistance in traditional connection methods. This device is not only simple in structure and easy to operate, but also provides a stable, safe, and reliable connection, possessing broad application prospects and significant economic value.
[0012] Preferably, in the above-mentioned steel joint for precast columns and precast columns and cast-in-place columns, longitudinal reinforcement bars are pre-embedded in both the precast upper column and the precast lower column. The longitudinal reinforcement bars extend through the end faces of the precast upper column and the precast lower column. The bottom plate of the steel joint body has through holes corresponding to the longitudinal reinforcement bars, and the bottom plate of the steel joint body is anchored to the precast upper column or the precast lower column by anchor nuts at the ends of the longitudinal reinforcement bars.
[0013] Preferably, in the above-mentioned steel joint for precast columns and precast columns and cast-in-place columns, a longitudinal reinforcement end pad is provided on the longitudinal reinforcement of the column, and the longitudinal reinforcement end pad is pressed tightly onto the bottom plate of the steel joint body by the longitudinal reinforcement end anchoring nut.
[0014] Preferably, in the above-mentioned steel joint for precast columns and precast columns and cast-in-place columns, the number of longitudinal reinforcement bars of the column is multiple, and they are arranged around the edge of the bottom plate of the steel joint body.
[0015] Preferably, in the above-mentioned steel joint for precast columns and precast columns and cast-in-place columns, the bottom plate of the steel joint body is fixed with an anti-shear anchor rod by an anchor rod anchoring nut.
[0016] Preferably, in the above-mentioned steel joint for precast columns and precast columns and cast-in-place columns, a shear anchor end pad is provided on the shear anchor rod, and the shear anchor end pad is pressed tightly onto the bottom plate of the steel joint body by the anchor anchor nut.
[0017] Preferably, in the above-mentioned steel joint for precast columns and precast columns and cast-in-place columns, the bottom plate of the steel joint body has a center hole.
[0018] Preferably, in the above-mentioned steel joint for precast columns and precast columns and cast-in-place columns, the number of shear anchor rods is multiple, and they are arranged around the central hole of the base plate.
[0019] Preferably, in the above-mentioned steel joint for precast columns and precast columns and cast-in-place columns, the side plate edge of the steel joint body has a bevel.
[0020] Preferably, in the above-mentioned steel joint for precast columns and precast columns, and precast columns and cast-in-place columns, the precast lower column can be a precast solid column, a precast hollow column, or a cast-in-place column; the precast upper column can be a precast solid column or a precast hollow column.
[0021] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a steel joint for precast columns and cast-in-place columns, which has the following beneficial effects:
[0022] 1. This utility model sets a steel joint body at the top (bottom) of a precast or cast-in-place column, and achieves the connection between the upper and lower columns through welding and anchoring. It is low in cost, easy to splice, reliable in connection performance and high in construction efficiency.
[0023] 2. This utility model sets shear anchor rods on the bottom plate of the steel joint and anchors them with anchor bolts, which further improves the connection performance between the upper and lower columns, such as the connection performance at the joint between the upper and lower columns.
[0024] 3. This utility model uses steel joints to set up four side plates and a horizontal base plate, and anchors the longitudinal reinforcement of the precast lower column to the horizontal base plate. The force is transmitted to the horizontal base plate through the steel bars, the horizontal base plate transmits the force to the four side plates, and the four side plates transmit the force to the precast lower column, which better realizes the transmission between the upper and lower precast columns. The bevel is set on the four side plates to increase the welding area, improve safety, and make the overall structure more stable.
[0025] 4. This utility model is not only applicable to the connection between precast columns, but also to the connection between precast columns. The precast upper column is a precast hollow column, a precast solid column, or a cast-in-place column, and the precast lower column is a precast hollow column or a precast solid column. The building is an organic whole. Cast-in-place buildings are more flexible in design and construction, while prefabricated buildings have the advantages of higher construction efficiency and energy saving and environmental protection. Combining the advantages of traditional buildings and prefabricated buildings, we can maximize the advantages and avoid the disadvantages, and achieve the best results. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0027] Figure 1 The attached figure is a structural schematic diagram of the steel joint for precast columns and cast-in-place columns provided by this utility model.
[0028] Figure 2 The attached figure shows the invention provided by this utility model. Figure 1 A schematic diagram of the structure of part I in the middle;
[0029] Figure 3 The attached figure is a structural schematic diagram of the steel joint body provided by this utility model.
[0030] in:
[0031] 1-Precast upper column; 2-Precast lower column; 3-Steel joint body; 4-Base plate; 5-Side plate; 6-Column longitudinal reinforcement; 7-Through hole; 8-Longitudinal reinforcement end anchor nut; 9-Longitudinal reinforcement end pad; 10-Anchor rod anchor nut; 11-Shear anchor rod; 12-Shear anchor rod end pad; 13-Base plate center hole; 14-Bevel. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] See appendix Figure 1 and attached Figure 3 This utility model discloses a steel joint for connecting precast columns with each other and precast columns with cast-in-place columns, for connecting precast upper column 1 and precast lower column 2; including two steel joint bodies 3 respectively connected to the mating end faces of precast upper column 1 and precast lower column 2;
[0034] The steel joint body 3 consists of a base plate 4 and side plates 5 around the perimeter. The base plates 4 of the two steel joint bodies 3 are anchored to the end faces of the precast upper column 1 and the precast lower column 2 respectively, so that the side plates 5 of the two steel joint bodies 3 correspond along their edges and are welded and fixed to achieve the docking of the precast upper column 1 and the precast lower column 2.
[0035] See appendix Figure 1 To be continued Figure 3 Both the precast upper column 1 and the precast lower column 2 have pre-embedded longitudinal reinforcement bars 6, which protrude from the end faces of the precast upper column 1 and the precast lower column 2. The bottom plate 4 of the steel joint body 3 has through holes 7 corresponding to the longitudinal reinforcement bars 6, and the bottom plate 4 of the steel joint body 3 is anchored to the precast upper column 1 or the precast lower column 2 by anchor nuts 8 at the ends of the longitudinal reinforcement bars. The longitudinal reinforcement bars 6 are used to enhance the bending and shear resistance of the column, and the through holes 7 are used to achieve precise alignment of the structural connection.
[0036] To further optimize the above technical solution, a longitudinal reinforcement end pad 9 is fitted on the column longitudinal reinforcement 6, and the longitudinal reinforcement end pad 9 is pressed onto the bottom plate 4 of the steel joint body 3 by the longitudinal reinforcement end anchoring nut 8.
[0037] To further optimize the above technical solution, the number of column longitudinal reinforcement bars 6 is multiple, and they are arranged around the edge of the bottom plate 4 of the steel joint body 3.
[0038] To further optimize the above technical solution, an anti-shear anchor rod 11 is fixed on the bottom plate 4 of the steel joint body 3 by an anchor rod anchoring nut 10, so as to significantly improve the shear resistance of the steel joint.
[0039] To further optimize the above technical solution, a shear anchor end pad 12 is fitted onto the shear anchor 11. The shear anchor end pad 12 is pressed onto the base plate 4 of the steel joint body 3 by the anchor anchor nut 10. The anchor end pad 12 is used to improve the anchoring effect at the end of the shear anchor 11, thereby improving the load-bearing capacity and stability of the connection structure.
[0040] To further optimize the above technical solution, the bottom plate 4 of the steel joint body 3 has a bottom plate center hole 13.
[0041] To further optimize the above technical solution, the number of shear anchor bolts 11 is multiple, and they are arranged around the central hole 13 of the bottom plate.
[0042] To further optimize the above technical solution, the side plate 5 of the steel joint body 3 has a bevel 14 along its edge, which ensures reliable welding with the precast upper column 1 and precast lower column 2. A bevel weld is formed at the bevel, and the bevel end face is ensured to be clean and tidy before welding. During welding, the correct position and method are selected to ensure welding quality.
[0043] To further optimize the above technical solution, the precast lower column 2 is a precast solid column, a precast hollow column, or a cast-in-place column; the precast upper column 1 is a precast solid column or a precast hollow column.
[0044] In this embodiment, the steel joint body 3 is to be treated for corrosion prevention and fireproofing.
[0045] When the column is a precast solid column, during the precasting process in the factory, the concrete is located between the bottom plates 4 of the upper and lower steel joint bodies 3 anchored by the column longitudinal reinforcement 6, and the vent pipe is pre-embedded at the lower end of the precast upper column 1. One end is connected to the vent hole on the bottom plate 4 of the steel joint body 3 anchored by the column longitudinal reinforcement 6, and the other end leads to the outside of the precast column. At least two vent pipes should be pre-embedded at the lower end of the same precast column, except when the lower part of the column is connected to the foundation. When the precast column is a hollow column, at least one bottom plate 4 of the steel joint body 3 should not be embedded in the precast concrete.
[0046] Finally, conduct necessary checks and tests to ensure that the performance of the connection device meets design requirements. This is to prevent technical or other issues from affecting the connection quality and thus the overall structure.
[0047] The connection between the steel joint and the column in this embodiment is firm and can meet the load requirements specified in the structural design, and has high resistance to bending, shear and torsion.
[0048] This utility model uses welding to connect columns. This method is simple in structure, convenient to construct, has good force transmission performance, and a firm connection. In addition, side plate bevels are set on the side plates around the steel joint. This structure ensures welding quality, increases the welding area, improves safety, and makes the overall structure more stable and reliable.
[0049] This invention is applicable not only to connections between precast columns but also to connections between precast and cast-in-place columns. The connection device is meticulously designed to withstand significant loads, ensuring the safety and stability of the building structure. The combined action of all components of this joint ensures a tight connection between precast columns and between precast and cast-in-place columns.
[0050] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.
[0051] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A steel joint for a precast column with a precast column, a precast column with a cast-in-situ column, for connecting a precast upper column (1) and a precast lower column (2); characterized in that, Two steel joint bodies (3) are connected to the end faces of the prefabricated upper column (1) and the prefabricated lower column (2) respectively; The bottom plates (4) of the two steel joint bodies (3) are respectively anchored and connected to the end faces of the prefabricated upper column (1) and the prefabricated lower column (2), so that the side plates (5) of the two steel joint bodies (3) correspond and are welded and fixed, realizing the butt joint of the prefabricated upper column (1) and the prefabricated lower column (2).
2. A steel joint for precast column to precast column, precast column to cast-in-situ column as claimed in claim 1 wherein, Column longitudinal reinforcement (6) is embedded in the prefabricated upper column (1) and the prefabricated lower column (2), the column longitudinal reinforcement (6) penetrates the end face of the prefabricated upper column (1) and the prefabricated lower column (2), the bottom plate (4) of the steel joint body (3) has a through hole (7) corresponding to the column longitudinal reinforcement (6), and the bottom plate (4) of the steel joint body (3) is anchored on the prefabricated upper column (1) or the prefabricated lower column (2) through longitudinal reinforcement end anchor nut (8).
3. A steel joint for precast column to precast column, precast column to cast-in-situ column as claimed in claim 2, wherein, The column longitudinal reinforcement (6) is sleeved with a longitudinal reinforcement end pad plate (9), and the longitudinal reinforcement end pad plate (9) is pressed on the bottom plate (4) of the steel joint body (3) through the longitudinal reinforcement end anchor nut (8).
4. A steel joint for precast column to precast column, precast column to cast-in-situ column as claimed in claim 3 wherein, The number of column longitudinal reinforcement (6) is multiple, and is arranged around the edge of the bottom plate (4) of the steel joint body (3).
5. A steel joint for precast column to precast column, precast column to cast-in-situ column as claimed in claim 1, wherein, The bottom plate (4) of the steel joint body (3) is fixed with a shear anchor rod (11) through an anchor rod anchor nut (10).
6. A steel joint for precast column to precast column, precast column to cast-in-situ column as claimed in claim 5 wherein, The shear anchor rod (11) is sleeved with a shear anchor rod end pad plate (12), and the shear anchor rod end pad plate (12) is pressed on the bottom plate (4) of the steel joint body (3) through the anchor rod anchor nut (10).
7. A steel joint for precast column to precast column, precast column to cast-in-situ column as claimed in claim 6 wherein, The bottom plate (4) of the steel joint body (3) has a bottom plate center hole (13) in the center.
8. A steel joint for precast column to precast column, precast column to cast-in-situ column as claimed in claim 7 wherein, The number of shear anchor rods (11) is multiple, and is arranged around the bottom plate center hole (13).
9. A steel joint for precast column to precast column, precast column to cast-in-situ column as claimed in claim 1, wherein, The side plate (5) of the steel joint body (3) has a bevel (14) along the mouth.
10. A steel joint for precast column to precast column, precast column to cast-in-situ column as claimed in claim 1, wherein, The prefabricated lower column (2) is a prefabricated solid column, a prefabricated hollow column or a cast-in-place column; the prefabricated upper column (1) is a prefabricated solid column or a prefabricated hollow column.