A connecting structure based on combination shear key teeth

Abstract

The present application relates to a kind of connection structure based on combination shear key tooth, including prefabricated column, deck and recess, the recess is installed on deck, the structure further include radial shear tooth key groove and axial shear tooth key groove, the radial shear tooth key groove and axial shear tooth key groove are installed in prefabricated column and recess, the radial shear tooth key groove and axial shear tooth key groove are adjacent, the prefabricated column is installed in recess and leave gap, high-strength grouting material is poured into gap and forms radial shear tooth key and axial shear tooth key.The present application is by radial slotting and axial slotting respectively in prefabricated column and deck, and by pouring high-strength grouting material to form radial shear tooth key and axial shear tooth key, under the combination of horizontal force and vertical force etc., the combination type shear tooth key has good adaptability.

Description

Technical Field

[0001] This invention relates to the field of bridge prefabrication and assembly technology, and in particular to a connection structure based on combined shear key teeth. Background Technology

[0002] The socket-type connection involves pre-drilling sockets for the columns within the foundation cap. The columns are prefabricated in the factory, transported to the site, hoisted into the socket position, grouted, and then the column is installed in the socket. The column position is adjusted, and high-strength grout is poured into the socket. Finally, as the grout strengthens, the column and foundation cap become a unified whole. The socket-type connection also features radial shear keys in the socket on the inner side of the foundation cap, with corresponding radial shear keys around the column socket position. This structure is suitable for transmitting vertical forces at the column-foundation connection and also has some adaptability to bending moments. However, when the horizontal force on the column is large, and the joint needs to transmit a large horizontal force, the purely radial shear keys cannot fully utilize the shear key's load-bearing characteristics.

[0003] Chinese patent application CN115748435A discloses a prefabricated bridge socket-type pier and cap connection structure, including a pier and a cap. The cap has a socket for accommodating the pier, and a first steel sleeve is pre-installed on the inner wall of the socket. The inner wall of the first steel sleeve has neatly arranged first shear keys. A second steel sleeve is pre-installed at one end of the pier inserted into the socket, and the outer wall of the second steel sleeve has neatly arranged second shear keys. The first and second shear keys are staggered. The gap between the first and second steel sleeves is a grouting section for secondary grouting. This patent does not address the issue of horizontal force and lacks the ability to adapt to both horizontal and vertical forces simultaneously.

[0004] Therefore, providing a connection structure that can adapt to both horizontal and vertical forces is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art and provide a connection structure based on combined shear key teeth.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] According to one aspect of the present invention, a connection structure based on combined shear keyways is provided, comprising a precast column, a bearing platform, and a groove, wherein the groove is installed on the bearing platform. The structure further comprises radial shear keyways and axial shear keyways, wherein the radial shear keyways and axial shear keyways are installed in the precast column and the groove, wherein the radial shear keyways and axial shear keyways are adjacent to each other. The precast column is installed in the groove with a gap, and high-strength grout is poured into the gap to form radial shear keyways and axial shear keyways.

[0008] As a preferred technical solution, the radial shear keyway is installed at the bottom of the precast column and the groove.

[0009] As a preferred technical solution, the prefabricated column and the groove are coaxial.

[0010] As a preferred technical solution, the radial shear keyway is a radial shear keyway made by radial slotting, and the axial shear keyway is an axial shear keyway made by axial slotting.

[0011] As a preferred technical solution, the support platform further includes a boss, which is equipped with a radial shear keyway or an axial shear keyway.

[0012] As a preferred technical solution, the structure further includes a foundation protective steel bar, which is installed on the foundation.

[0013] As a preferred technical solution, the protective reinforcement of the bearing platform includes U-shaped steel bars, which are installed on the bearing platform.

[0014] As a preferred technical solution, the protective reinforcement of the foundation also includes annular stirrups, which are installed on the foundation.

[0015] As a preferred technical solution, the protective reinforcement of the foundation also includes a grid reinforcement, which is installed on the foundation.

[0016] As a preferred technical solution, the protective reinforcement of the foundation also includes reinforcing bars, which are installed in the foundation.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This invention involves radial and axial slotting on precast columns and foundations, respectively, and forming radial and axial shear keys by pouring high-strength grout. Under the combined action of horizontal and vertical forces, this combined shear key exhibits good adaptability.

[0019] 2. By setting a boss, the present invention can reduce the amount of foundation material used and save costs while meeting the insertion depth requirements of the precast column into the foundation.

[0020] 3. The present invention provides U-shaped steel bars, ring stirrups and reinforcing steel bars in the foundation, which improves the crack resistance of the foundation.

[0021] 4. The present invention sets a grid of steel bars in the foundation, which improves the crack resistance and punching shear resistance of the bottom of the foundation. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the overall structure of the present invention;

[0023] Figure 2 This is a sectional view of the foundation of the present invention;

[0024] Figure 3 This is a planar sectional view of the foundation of the present invention;

[0025] Figure 4 This is a planar sectional view of the boss in this utility model.

[0026] Figure 5 This is a vertical cross-sectional view of the protective reinforcement bars for the foundation of the present invention;

[0027] Figure 6 This is a planar cross-sectional view of the protective reinforcement bars for the foundation of the present invention.

[0028] 1. Precast column; 2. Foundation; 3. Boss; 4. Radial shear key; 5. Axial shear key; 6. U-shaped reinforcement; 7. Circular stirrup; 8. Mesh reinforcement; 9. Reinforcing reinforcement. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0030] The prefabrication and assembly of bridges has developed rapidly in recent years. In urban roads, the substructure of bridges is also widely prefabricated, which can accelerate construction and reduce adverse traffic impacts. Grouting sleeves are commonly used to connect bridge piers and abutments. However, grouting sleeves also have drawbacks such as high precision requirements and potential for incomplete grouting. Therefore, socket-type connections have become a better choice.

[0031] The socket-type connection involves pre-drilling sockets for the columns within the foundation. The columns are prefabricated in the factory, transported to the site, hoisted into the socket position, grouted, and then the column is installed in the socket. The column position is adjusted, and high-strength grout is poured into the socket. Finally, as the grout strengthens, the column and foundation become a unified whole. The socket-type connection also features radial shear keys in the socket on the inner side of the foundation, with corresponding radial shear keys around the column socket position. This structure is suitable for transmitting vertical forces at the column-foundation connection and also has some adaptability to bending moments. However, when the horizontal force on the column is large, and the joint needs to transmit a large horizontal force, pure radial shear keys cannot fully utilize the shear key's load-bearing characteristics. If axial shear keys are used in a small area, and radial shear keys are used for the majority to resist vertical forces, then it has significant advantages when the joint is subjected to both horizontal and vertical forces.

[0032] This invention provides a connection structure based on combined shear key teeth. By radially and axially slotting precast columns and foundations, respectively, and then casting high-strength grout to form radial and axial shear key teeth, this combined shear key tooth structure exhibits good adaptability under combined horizontal and vertical forces. By adding bosses, this invention reduces foundation material usage while still meeting the required precast column insertion depth, thus saving costs. The invention also improves the crack resistance of the foundation by incorporating U-shaped reinforcing bars, ring stirrups, and reinforcing bars. Finally, the invention enhances the crack resistance and punching shear resistance of the foundation bottom by incorporating grid reinforcement.

[0033] Example 1

[0034] like Figures 1-4 As shown, a connection structure based on combined shear keyways includes a prefabricated column 1, a base 2, and a groove. The groove is installed on the base 2. The structure also includes radial shear keyways and axial shear keyways, which are installed in the prefabricated column 1 and the groove. The radial and axial shear keyways are adjacent to each other. The prefabricated column 1 is installed in the groove with a gap. High-strength grout is poured into the gap to form radial shear keyways 4 and axial shear keyways 5.

[0035] The radial shear keyway is installed at the bottom of the precast column 1 and the groove. The precast column 1 and the groove are coaxial.

[0036] The radial shear keyway is a radial shear keyway manufactured by radial slotting, and the axial shear keyway is an axial shear keyway manufactured by axial slotting. The bearing platform 2 also includes a boss 3, on which the radial shear keyway or the axial shear keyway is mounted.

[0037] In this embodiment, the grooves of the precast column 1 and the base 2 are connected by a socket joint. To meet the force requirements of the socket depth and reduce the material usage of the base 2, a boss 3 is installed on the top of the base 2. Shear keyways are used at the corresponding locations of the socket joint on the inner wall of the groove and the bottom of the precast column 1. Generally, radial shear keyways 4 are used to bear vertical forces and bending moments. Axial shear keyways 5 are used within a short distance at the top of the socket joint to mainly bear horizontal forces and bending moments. Radial or axial shear keyways are installed on the boss 3, which can be adjusted according to the height of the boss 3, the length of the precast column 1, and the depth of the groove. Radial or axial shear keyways are set at the corresponding locations of the boss 3.

[0038] The precast column 1 is a common rectangular reinforced concrete column. The end side of the precast column 1 is provided with shear-resistant keyways. The foundation 2 is a cast-in-place or precast reinforced concrete foundation with grooves. The foundation 2 is connected to the bridge pile foundation. The side of the groove is provided with shear-resistant keyways. The end of the precast column 1 is inserted into the groove of the foundation 2, and the precast column 1 and foundation 2 form a gap. 100MPa high-strength grout is poured into the gap to form radial shear keyways 4 and vertical shear keyways 5. The high-strength grout includes expansive cement, ordinary cement, gypsum, fly ash, silica fume, mineral powder, polypropylene fiber and quartz sand, etc., which are metered and mixed in a professional chemical plant. At the place of use, water or matching components are added in a specified ratio and mixed. It is a material used for grouting at the socket. By slotting the precast column 1 in the axial and radial directions and forming radial shear key 4 and vertical shear key 5, it has good adaptability under the action of horizontal and vertical forces and can well bear horizontal forces, vertical forces and bending moments.

[0039] The structure also includes protective steel bars for the foundation, which are installed on the foundation 2.

[0040] The protective reinforcement of the foundation includes U-shaped steel bars 6, which are installed on the foundation 2. The protective reinforcement also includes ring stirrups 7, which are installed on the foundation 2. The protective reinforcement also includes mesh steel bars 8, which are installed on the foundation 2. The protective reinforcement also includes reinforcing steel bars 9, which are installed in the foundation 2.

[0041] In this embodiment, in addition to the conventional reinforcement, the foundation 2 is also equipped with protective reinforcement to prevent local cracking of the groove. Figure 5 and Figure 6As shown, to improve the shear resistance of the groove, the bearing platform 2 is equipped with U-shaped steel bars 6, with both ends of the U-shaped steel bars 6 extending parallel to the horizontal plane; to enhance the crack resistance of the inner wall of the groove, the bearing platform 2 is equipped with annular stirrups 7 around the inner wall of the groove; to improve the crack and shear resistance of the bottom of the groove, a grid steel bar 8 is provided at the bottom of the groove in the bearing platform 2; in addition, to further enhance the crack resistance of the groove, reinforcing steel bars 9 are installed on the inner wall of the groove. Specifically, the annular stirrups 7 are installed in the inner wall around the groove; the U-shaped steel bars 6 are periodically arranged and installed in the bearing platform 2, supporting the sides and bottom of the groove; the grid steel bars 8 are arranged at the bottom of the groove; and the reinforcing steel bars 9 are installed in the upper part of the groove and are perpendicular to the vertical direction.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A connection structure based on combined shear key teeth, comprising a prefabricated column (1), a base (2), and a groove, wherein the groove is installed on the base (2), characterized in that, The structure also includes radial shear keyways and axial shear keyways, which are installed in the precast column (1) and the groove. The radial shear keyways and axial shear keyways are adjacent to each other. The precast column (1) is installed in the groove with a gap, and high-strength grout is poured into the gap to form radial shear keyways (4) and axial shear keyways (5).

2. The connection structure based on combined shear key teeth according to claim 1, characterized in that, The radial shear keyway is installed at the bottom of the precast column (1) and the groove.

3. The connection structure based on combined shear key teeth according to claim 1, characterized in that, The prefabricated column (1) and the groove are coaxial.

4. The connection structure based on combined shear key teeth according to claim 1, characterized in that, The radial shear keyway is a radial shear keyway made by radial slotting, and the axial shear keyway is an axial shear keyway made by axial slotting.

5. The connection structure based on combined shear key teeth according to claim 1, characterized in that, The support platform (2) also includes a boss (3), which is equipped with a radial shear keyway or an axial shear keyway.

6. The connection structure based on combined shear key teeth according to claim 1, characterized in that, The structure also includes a protective steel bar for the foundation, which is installed on the foundation (2).

7. A connection structure based on combined shear key teeth according to claim 6, characterized in that, The protective reinforcement of the foundation includes U-shaped steel bars (6), which are installed on the foundation (2).

8. A connection structure based on combined shear key teeth according to claim 6, characterized in that, The protective reinforcement of the foundation also includes a ring stirrup (7), which is installed on the foundation (2).

9. A connection structure based on combined shear key teeth according to claim 6, characterized in that, The protective reinforcement of the foundation also includes a grid reinforcement (8), which is installed on the foundation (2).

10. A connection structure based on combined shear key teeth according to claim 6, characterized in that, The protective reinforcement of the foundation also includes reinforcing bars (9), which are installed in the foundation (2).

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