A grouting anchoring connection node structure of a precast column and a precast foundation

Abstract

The utility model relates to a kind of grouting anchoring connection node structure of prefabricated column and prefabricated foundation, multiple rectangular closed stirrups are laid in the inside of the middle section of prefabricated foundation, and multiple metal bellows are respectively arranged with interval in the inside of the front and back sides of rectangular closed stirrup;The top of prefabricated foundation and located above rectangular closed stirrup are provided with inner concave key groove, and the both sides of inner concave key groove are respectively provided with foam PE adhesive tape, and temporary steel corbels are provided in the top of foam PE adhesive tape, and temporary steel corbels are respectively located in the both sides of prefabricated column;Prefabricated column is equipped with prefabricated column longitudinal reinforcement, and prefabricated column longitudinal reinforcement extends to the outside of prefabricated column bottom end, and is anchored into metal bellows, and the outer convex structure matched with inner concave key groove is provided in the bottom of prefabricated column, and outer convex structure is clamped in inner concave key groove.The utility model solves the problems of high installation precision requirement, low construction efficiency and insufficient structural reliability in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering technology, and in particular relates to a grouting anchorage connection node structure for precast columns and precast foundations. Background Technology

[0002] In precast concrete structures, the connection nodes between precast columns and precast foundations are critical to ensuring the overall stability of the structure, and their performance directly affects the building's load-bearing capacity, seismic performance, and service life. Currently, common connection methods in the industry mainly include embedded bolt connections, welding connections, and grout-anchored lap connections, but each method has significant limitations in practical applications.

[0003] Pre-embedded bolt connections require precise pre-embedding of positioning bolts during the precast foundation pouring stage. After the precast column is hoisted into place, mechanical fastening is achieved through bolts and nuts (e.g., patent publication number CN202421536909.4, titled: A Connection Node Between Precast Columns and Foundations). This method not only demands extremely high precision in bolt pre-embedding (allowable deviation is typically less than 5mm), but even slight deviations during construction can lead to installation difficulties. Furthermore, the bolts are prone to corrosion due to long-term exposure, resulting in high maintenance costs.

[0004] Welded connections are achieved by welding pre-embedded steel plates at the bottom of precast columns to pre-embedded foundation components on-site (e.g., patent publication number CN202221152914.6, titled: A Prefabricated Frame Structure Beam-Column Connection Node Structure). However, the quality of on-site welding is significantly affected by the skill level of workers, and defects such as incomplete welds and slag inclusions are prone to occur. In addition, high-temperature operations can easily lead to local stress concentration in components, and welding operations are greatly affected by weather, thus prolonging the construction period.

[0005] Although grout-anchor lap connection eliminates the need for complex mechanical fastening procedures, the ordinary cement-based grouting materials traditionally used generally suffer from problems such as slow early strength growth (7-day strength is usually 70% lower than the design value), poor crack resistance, and insufficient durability, which limits its applicability in high-load, strong earthquake-resistant, and harsh environments.

[0006] Therefore, it is necessary to improve the connection node structure between precast columns and precast foundations in order to solve the technical problems faced by the existing technology. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a grouting anchorage connection node structure for precast columns and precast foundations, solving the problems of high installation accuracy requirements, low construction efficiency, and insufficient structural reliability in existing technologies.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: A grouting anchorage connection node structure for a precast column and a precast foundation, wherein multiple rectangular closed stirrups are arranged sequentially from top to bottom inside the middle section of the precast foundation, and multiple metal corrugated pipes are arranged at intervals on the inner sides of the front and rear sides of the rectangular closed stirrups, with the metal corrugated pipes on one side facing each other. A concave keyway is provided at the top of the precast foundation and above the rectangular closed stirrup. Foam PE strips are provided on both sides of the concave keyway. Temporary steel brackets are provided on the top of the foam PE strips. The temporary steel brackets are located on both sides of the precast column for temporary support and fixation of the precast column. The precast column is provided with longitudinal ribs, which extend to the outer side of the bottom end of the precast column and are anchored into the corrugated metal pipe. The bottom of the precast column is provided with an outward convex structure that matches the concave keyway, and the outward convex structure is fitted into the concave keyway.

[0009] Preferably, the diameter of the corrugated metal pipe is not less than the diameter of the longitudinal reinforcement of the precast column d+20mm, and the length is not less than the length of the longitudinal reinforcement of the precast column exposed outside the precast column 20d+30mm.

[0010] Preferably, the lower end of the metal corrugated pipe is fixedly connected to the lowest rectangular closed stirrup, the upper end is fixedly connected to the uppermost rectangular closed stirrup, and extends to the outer side of the top of the precast foundation.

[0011] Preferably, the corrugated metal pipe is fixedly connected to the inside of the rectangular closed stirrup by a flexible binding strip.

[0012] Preferably, the length of the precast column longitudinal reinforcement anchored into the metal corrugated pipe is not less than 20d.

[0013] Preferably, the number of the plurality of rectangular closed stirrups is not less than three, and the spacing between each rectangular closed stirrup and the adjacent rectangular closed stirrup is less than or equal to 200mm.

[0014] Preferably, the cross-section of the concave keyway is an inverted trapezoidal shape with a depth of 30-60mm. The cross-sectional shape of the convex structure is the same as that of the concave keyway, which is an inverted trapezoidal shape. Its height is equal to the depth of the concave keyway, and its length and width are less than the length and width of the concave keyway.

[0015] Preferably, the bottom of the temporary steel bracket is provided with a first connector, and the top of the precast foundation is provided with a first embedded nut that cooperates with and connects to the first connector. The temporary steel bracket is fixedly connected to the top of the precast foundation through the first connector and the first embedded nut.

[0016] Preferably, the temporary steel bracket is provided with at least one second connector on the side facing the precast column, and the precast column is provided with at least one second embedded nut that cooperates with the second connector on the side facing the temporary steel bracket.

[0017] The technical effects and advantages of this utility model are as follows: 1. The grouting anchorage connection node structure between precast columns and precast foundations provided in this application solves the problems of high installation accuracy requirements, low construction efficiency, and insufficient node reliability in the existing technology by setting metal corrugated pipes in the precast foundation, adopting the process of grouting before inserting reinforcement bars, setting temporary steel brackets to support the precast columns, embedding nuts in the precast columns for leveling, setting convex shear-resistant structures and rectangular closed stirrups to constrain the metal corrugated pipes. It has outstanding advantages such as convenient construction, superior node performance, and wide applicability, and is especially suitable for prefabricated building structures with high performance and high seismic resistance requirements.

[0018] 2. The grouting anchoring connection node structure between precast columns and precast foundations provided in this application integrates the dual functions of sealing and grout blocking and gap control by setting foam PE rubber strips as a key detail innovation. Its preset compressibility ensures the uniformity and precision of the installation gap, and guarantees the forming quality of the grouting body from the source of the process.

[0019] 3. The grouting anchorage connection node structure between precast columns and precast foundations provided in this application has outstanding advantages such as convenient construction, superior node performance, and wide applicability. It is especially suitable for prefabricated building structures with high performance and high seismic resistance requirements, and significantly improves the installation quality, structural reliability and construction efficiency of the node. Attached Figure Description

[0020] Fig. 1 This is a schematic diagram of the structure of this utility model; Fig. 2 This is a schematic diagram of the prefabricated foundation structure of this utility model.

[0021] The following are the labels in the diagram: 1. Precast foundation; 2. Rectangular closed stirrup; 3. Corrugated metal pipe; 4. Concave keyway; 5. Foam PE strip; 6. Temporary steel bracket; 7. Precast column; 8. Longitudinal reinforcement of precast column; 9. Outwardly protruding structure; 10. First connector; 11. First embedded nut; 12. Second connector; 13. Second embedded nut. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the embodiments given in the accompanying drawings.

[0023] See Figs. 1-2As shown, a grouting anchorage connection node structure for a precast column and a precast foundation is disclosed. The precast foundation 1 has multiple rectangular closed stirrups 2 spaced out from top to bottom within its middle section. Multiple corrugated metal pipes 3 are spaced out on the inner sides of the front and rear sides of each rectangular closed stirrup 2, with one side of the corrugated metal pipe 3 facing the other side. A concave keyway 4 is provided at the top of the precast foundation 1, above the rectangular closed stirrups 2. Foamed PE strips 5 are provided on both sides of the concave keyway 4, and temporary steel brackets 6 are provided on top of the foamed PE strips 5. These temporary steel brackets 6 are located on both sides of the precast column 7 for temporary support and fixation. The precast column 7 has longitudinal reinforcement 8 extending to the outer side of its bottom end and anchored into the corrugated metal pipes 3. The bottom of the precast column 7 has a protruding structure 9 that matches the concave keyway 4, and the protruding structure 9 is fitted into the concave keyway 4.

[0024] In this embodiment, during the production stage of the precast foundation 1, a corrugated metal pipe 3 is pre-embedded, and the corrugated metal pipe 3 forms a grouting channel at the top of the precast foundation 1; when the precast column 7 is precast, a precast column longitudinal reinforcement 8 is reserved at the bottom, and the position of the precast column longitudinal reinforcement 8 corresponds one-to-one with the corrugated metal pipe channel; after the precast foundation 1 is installed and fixed on site, ultra-high performance inorganic composite material grout is filled into the corrugated metal pipe channel; then the precast column 7 is lifted so that the bottom precast column longitudinal reinforcement 8 is inserted into the corrugated metal pipe channel filled with grout; the precast column 7 is supported and fixed by temporary steel brackets 6 set on both sides of the precast foundation 1, and the temporary support brackets 6 can be removed after the grout reaches the design strength.

[0025] It should be noted that the diameter of the corrugated metal pipe 3 is not less than the diameter d + 20 mm of the precast column longitudinal reinforcement 8, and the length is not less than the length of the precast column longitudinal reinforcement 8 exposed outside the precast column 7, which is 20d + 30 mm. The length of the precast column longitudinal reinforcement 8 anchored into the corrugated metal pipe 3 is not less than 20d.

[0026] The combination of the corrugated metal pipe 3 and the pre-reserved longitudinal reinforcement 8 reduces the installation positioning accuracy requirements and minimizes the impact of construction errors. The process of grouting before inserting reinforcement improves the fullness of grouting and avoids the void defects that are prone to occur in traditional post-grouting. The temporary steel bracket 6 enhances the stability of the construction process and facilitates the adjustment of the verticality of the precast column 7. The ultra-high performance inorganic composite grout has high early strength (7-day strength reaches C100) and good bonding performance, which significantly improves the joint bearing capacity and durability, and is suitable for building projects with high seismic fortification intensity.

[0027] In one embodiment, the lower end of the corrugated metal pipe 3 is fixedly connected to the lowest rectangular closed stirrup 2, and the upper end is fixedly connected to the uppermost rectangular closed stirrup 2, extending to the outer side of the top of the precast foundation 1, thereby facilitating the insertion of the precast column longitudinal reinforcement 8.

[0028] It should be noted that the corrugated metal pipe 3 is fixedly connected to the inside of the rectangular closed stirrup 2 by a flexible binding strip. The flexible binding strip can be a binding tape or steel wire, etc., whichever is selected according to the on-site construction conditions.

[0029] In one embodiment, the number of the plurality of rectangular closed stirrups 2 is not less than three, and the spacing between each rectangular closed stirrup 2 and the adjacent rectangular closed stirrup 2 is less than or equal to 200mm. Through this design, the stability of the metal corrugated pipe 3 reserved during the fabrication of the precast foundation 1 can be improved, and displacement can be avoided.

[0030] By evenly arranging rectangular closed stirrups 2 within the precast foundation 1, they can be used to fix the position of the corrugated metal pipe 3, and also to restrain the concrete and grout, prevent cracking, and improve the toughness and durability of the joint.

[0031] In one embodiment, the cross-section of the concave keyway 4 is an inverted trapezoidal shape with a depth of 30-60mm. The cross-sectional shape of the convex structure 9 is the same as that of the concave keyway 4, which is an inverted trapezoidal shape. Its height is equal to the depth of the concave keyway 4, and its length and width are less than the length and width of the concave keyway 4.

[0032] By incorporating a concave keyway 4 and a convex structure 9, the shear resistance and overall integrity of the joint are enhanced through interlocking. Setting the depth of the concave keyway 4 to 30-60mm improves the shear bearing capacity of the joint. The concave keyway 4, working in conjunction with the grouting material, forms a mechanical interlock, enhancing the joint's stiffness and seismic performance. The design of the convex structure 9 allows for the pre-grouting and post-insertion process, ensuring the grouting material fills the duct.

[0033] In one embodiment, the temporary steel bracket 6 is provided with a first connector 10 at its bottom, and the precast foundation 1 is provided with a first embedded nut 11 that cooperates with and connects to the first connector 10 at its top. The temporary steel bracket 6 is fixedly connected to the top of the precast foundation 1 through the first connector 10 and the first embedded nut 11.

[0034] By using connector 10 and embedded nut 11, temporary steel bracket 6 can be quickly fixed to the prefabricated foundation 1, thereby improving the convenience and efficiency of construction.

[0035] In one embodiment, the temporary steel bracket 6 is provided with at least one second connector 12 on the side facing the precast column 7, and the precast column 7 is provided with at least one second embedded nut 13 that cooperates with and connects to the second connector 12 on the side facing the temporary steel bracket 6.

[0036] By setting up temporary steel brackets 6 and threadedly connecting them to the embedded nuts 13 inside the precast column 7 via connectors 12, reliable temporary support and fixation can be provided for the precast column 7 before the grout solidifies, ensuring its stability during construction and facilitating adjustments to its verticality and position. Through the embedded nuts 13 pre-embedded in the column body and the connectors 12 pre-embedded in the precast foundation 1, the planar position, elevation, and inclination angle of the precast column 7 can be adjusted on-site. This ensures accurate positioning of the precast column 7 during construction.

[0037] It should be noted that the connector 12 of this application is composed of a nut and a bolt, which facilitates quick connection and disassembly.

[0038] This application reduces the installation positioning accuracy requirements and minimizes the impact of construction errors by using the combination of metal corrugated pipe 3 and longitudinal steel bars of precast column 3; the process of grouting first and then inserting reinforcement improves the fullness of grouting and avoids the void defects that are prone to occur in traditional post-grouting; the temporary steel bracket 6 supports enhance the stability of the construction process and facilitates the adjustment of the verticality of the precast column; the ultra-high performance inorganic composite grout has high early strength (7-day strength reaches C100) and good bonding performance, which significantly improves the joint bearing capacity and durability, and is suitable for building projects with high seismic fortification intensity.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A grouting anchorage connection structure between a precast column and a precast foundation, characterized in that: The precast foundation (1) has multiple rectangular closed stirrups (2) arranged from top to bottom in the middle section. Multiple metal corrugated pipes (3) are arranged at intervals on the inner sides of the front and rear sides of the rectangular closed stirrups (2). The metal corrugated pipes (3) on one side are arranged opposite to the metal corrugated pipes (3) on the other side. A concave keyway (4) is provided on the top of the precast foundation (1) and above the rectangular closed stirrup (2). Foam PE strips (5) are provided on both sides of the concave keyway (4). Temporary steel brackets (6) are provided on the top of the foam PE strips (5). The temporary steel brackets (6) are located on both sides of the precast column (7) for temporary support and fixation of the precast column (7). The precast column (7) is provided with precast column longitudinal reinforcement (8), the precast column longitudinal reinforcement (8) extends to the outer side of the bottom end of the precast column (7) and is anchored into the metal corrugated pipe (3). The bottom of the precast column (7) is provided with an external convex structure (9) that matches the concave keyway (4), and the external convex structure (9) is fitted into the concave keyway (4).

2. The grouting anchorage connection node structure between a precast column and a precast foundation according to claim 1, characterized in that: The diameter of the metal corrugated pipe (3) is not less than the diameter d+20mm of the precast column longitudinal reinforcement (8), and the length is not less than the length 20d+30mm of the precast column longitudinal reinforcement (8) exposed outside the precast column (7).

3. The grouting anchorage connection node structure between a precast column and a precast foundation according to claim 2, characterized in that: The lower end of the metal corrugated pipe (3) is fixedly connected to the lowest rectangular closed stirrup (2), and the upper end is fixedly connected to the uppermost rectangular closed stirrup (2), extending to the outer side of the top of the prefabricated foundation (1).

4. The grouting anchorage connection node structure between a precast column and a precast foundation according to claim 3, characterized in that: The corrugated metal pipe (3) is fixedly connected to the inside of the rectangular closed stirrup (2) by a flexible binding strip.

5. The grouting anchorage connection node structure between a precast column and a precast foundation according to claim 2, characterized in that: The length of the precast column longitudinal reinforcement (8) anchored into the metal corrugated pipe (3) is not less than 20d.

6. The grouting anchorage connection node structure between a precast column and a precast foundation according to claim 1, characterized in that: The number of the plurality of rectangular closed stirrups (2) is not less than three, and the spacing between each rectangular closed stirrup (2) and the adjacent rectangular closed stirrup (2) is less than or equal to 200 mm.

7. The grouting anchorage connection node structure between a precast column and a precast foundation according to claim 1, characterized in that: The cross-section of the concave keyway (4) is an inverted trapezoidal shape with a depth of 30-60mm. The cross-sectional shape of the convex structure (9) is the same as that of the concave keyway (4), which is an inverted trapezoidal shape. Its height is equal to the depth of the concave keyway (4), and its length and width are less than those of the concave keyway (4).

8. The grouting anchorage connection node structure between a precast column and a precast foundation according to claim 1, characterized in that: The temporary steel bracket (6) is provided with a first connector (10) at the bottom, and the precast foundation (1) is provided with a first embedded nut (11) that is connected to the first connector (10) at the top. The temporary steel bracket (6) is fixedly connected to the top of the precast foundation (1) through the first connector (10) and the first embedded nut (11).

9. The grouting anchorage connection node structure between a precast column and a precast foundation according to claim 8, characterized in that: The temporary steel bracket (6) is provided with at least one second connector (12) on the side facing the precast column (7), and the precast column (7) is provided with at least one second embedded nut (13) that cooperates with the second connector (12) on the side facing the temporary steel bracket (6).

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