Anti-seismic tough column base joint for prefabricated hollow combined pier column

Abstract

The invention discloses an anti-seismic tough column base joint for a prefabricated hollow combined pier column. The anti-seismic tough column base joint comprises the prefabricated hollow combined pier column, a foundation, a grouting material and post-pouring concrete. The prefabricated hollow combined pier column comprises a corrugated steel pipe and a concrete layer, and the concrete layer wraps the periphery of the corrugated steel pipe. Longitudinal bars and stirrups are arranged in the concrete layer; the bottom ends of the longitudinal bars are inserted into the foundation; the foundation is provided with steel bar anchor holes and anchor bars, and one ends of the longitudinal bars are inserted into the steel bar anchor holes. The anchor bars are annularly distributed at equal intervals, the anti-seismic tough column base node of the prefabricated hollow combined pier column is formed by filling grouting materials into the steel bar anchor holes of the foundation, the overhanging longitudinal bars of the prefabricated hollow combined pier column are orthogonally inserted into the steel bar anchor holes of the foundation, and then post-pouring concrete is poured into the corrugated steel pipes. According to the invention, the interface force transmission performance of the post-poured concrete and the prefabricated pier column can be improved, and the bearing capacity and rigidity of the plastic hinge area and the anti-seismic bearing capacity and deformation resistance of the column base node are improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to an earthquake-resistant and tough column foot node for prefabricated hollow composite pier columns. Background Art

[0002] Hollow reinforced concrete piers have the advantages of light weight, high lateral bearing capacity and high lateral stiffness, and are increasingly widely used in bridge structures. The application of traditional hollow piers in engineering projects has the following problems: 1) The piers use double-layer steel bars, which makes it difficult to tie the steel bars; the forming of hollow piers requires an inner mold, which is difficult to remove. 2) When the column foot node is assembled, an embedded column foot node is often used, but the buried depth often requires 1.5-2.5 times the pier diameter, and the economy of the column foot node is poor; when the grouting sleeve is used for connection, the inner row of steel bars is difficult to connect effectively, affecting the assembly efficiency and force performance; 3) The plastic hinge area of ​​the column foot node of the hollow pier column is easy to bulge inward under the action of an earthquake, and the post-earthquake residual deformation of the column foot node is large, which affects its seismic toughness. Therefore, it is urgent to develop new prefabricated hollow piers and their column foot node forms to improve the above situation. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a seismic toughness column base node for prefabricated hollow composite piers, which can improve the interface force transmission performance between post-cast concrete and prefabricated piers, and improve the bearing capacity and stiffness of the plastic hinge zone as well as the seismic bearing capacity and deformation resistance of the column base node.

[0004] In order to achieve the above-mentioned object, the present invention provides a seismic toughness column foot node for a prefabricated hollow composite pier column, comprising a prefabricated hollow composite pier column, a foundation, a grouting material and post-cast concrete; the prefabricated hollow composite pier column is connected to the foundation; the prefabricated hollow composite pier column comprises a corrugated steel pipe and a concrete layer, the concrete layer is wrapped around the outer periphery of the corrugated steel pipe; longitudinal reinforcement and stirrups are arranged in the concrete layer; the bottom end of the longitudinal reinforcement extends out of the bottom surface of the prefabricated hollow composite pier column and is inserted into the foundation;

[0005] The foundation is provided with steel bar anchor holes and anchor bars, the steel bar anchor holes correspond to the extended parts of the longitudinal bars of the prefabricated hollow composite pier column, one end of the longitudinal bars extending out of the prefabricated hollow composite pier column is inserted into the steel bar anchor holes; the anchor bars are distributed in a ring shape with equal spacing, and the diameter of the circumscribed circle of the outer surface of the anchor bars is not greater than the minimum inner diameter of the corrugated steel pipe;

[0006] The seismic toughness column foot node of the prefabricated hollow composite pier column is achieved by filling the steel bar anchor hole of the foundation with grouting material, inserting the extended longitudinal reinforcement of the prefabricated hollow composite pier column orthogonally into the steel bar anchor hole of the foundation, and then pouring the post-cast concrete in the corrugated steel pipe so that the height of the post-cast concrete is 20-50mm greater than the top of the anchor bar.

[0007] Furthermore, the corrugated steel pipe is a circular galvanized corrugated steel pipe, the ribs of the corrugated steel pipe are a kind of transverse ribs or oblique ribs, and the corrugations are a kind of sine waves, trapezoidal waves or rectangular waves.

[0008] Furthermore, the longitudinal reinforcement and stirrups of the concrete layer of the prefabricated hollow composite pier column are single-layer or double-layer, and the stirrups are spiral stirrups.

[0009] Furthermore, the extended part of the longitudinal reinforcement in the prefabricated hollow composite pier is reserved with a non-bonded section of 1 to 5 times its own diameter, and the non-bonded section is formed by an external plastic casing or an external steel casing.

[0010] Furthermore, the inner diameter of the steel bar anchor hole in the foundation is more than 5 mm larger than the outer diameter of the longitudinal reinforcement inserted into the steel bar anchor hole, and the steel bar anchor hole is formed by pre-buried corrugated steel pipe.

[0011] Furthermore, the length of the anchor bar inserted into the corrugated steel pipe of the prefabricated hollow composite pier column is not less than the anchoring length of the anchor bar inserted into the foundation.

[0012] Furthermore, the strength grade of the post-cast concrete is higher than the strength of the concrete layer of the prefabricated hollow composite pier column, and the post-cast concrete is one of self-compacting concrete, high-strength concrete and ultra-high performance concrete.

[0013] Beneficial effects of the present invention:

[0014] 1. The circular corrugated steel pipe of the prefabricated hollow composite pier column of the present invention has a special wave structure, which can greatly improve the interface force transmission performance between the post-cast concrete and the prefabricated pier column, and efficiently transfer the pier column load to the post-cast concrete and foundation anchor bars; improve the seismic bearing capacity of the column foot node.

[0015] 2. The plastic hinge area of ​​the prefabricated hollow composite pier column of the patented invention is filled with post-cast concrete, which can improve the bearing capacity and stiffness of the plastic hinge area, and the circular corrugated steel pipe can well restrain the post-cast concrete, thereby significantly improving the seismic deformation capacity of the column foot node.

[0016] 3. The circular corrugated steel pipe of the patented prefabricated hollow composite pier column can serve as the inner template for the prefabrication of the pier column. At the same time, the corrugated steel pipe is used to replace the inner row of steel bars of the traditional hollow pier column, which significantly improves the production efficiency of the prefabricated pier column. The large out-of-plane stiffness of the corrugated steel pipe can prevent the inward deformation of the hollow pier column and improve the seismic performance of the prefabricated pier column.

[0017] 4. The outrigger steel bars and anchor bars of the pier column of the present invention yield in batches. After the outrigger steel bars yield, the anchor bars can provide the later stiffness of the column foot node, reduce the post-earthquake residual deformation of the column foot node, and improve the seismic toughness of the column foot node. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the column base node of embodiments 1 and 2 of the present invention.

[0019] Figure 2 It is a local schematic diagram of the column base node of Examples 1 and 2 of the present invention.

[0020] Figure 3 It is a basic top view of Example 1 of the present invention.

[0021] Figure 4 It is a basic top view of Example 2 of the present invention.

[0022] Figure 5 It is a side view of the prefabricated hollow composite pier column of Examples 1 and 2 of the present invention.

[0023] Figure 6 It is a bottom view of the prefabricated hollow composite pier column of Example 1 of the present invention.

[0024] Figure 7 It is a bottom view of the prefabricated hollow composite pier column of Example 2 of the present invention.

[0025] In the figure: 1. Prefabricated hollow composite pier; 2. Foundation; 3. Grouting material; 4. Post-cast concrete; 11. Corrugated steel pipe; 12. Longitudinal reinforcement; 13. Stirrups; 14. Concrete layer; 21. Anchor reinforcement; 22. Rebar anchor hole. DETAILED DESCRIPTION

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0027] The invention discloses a seismic toughness column foot node for prefabricated hollow composite pier columns.

[0028] Reference Figure 1 , a seismic toughness column foot node for a prefabricated hollow composite pier column, comprising a prefabricated hollow composite pier column 1, a foundation 2, a grouting material 3 and a post-cast concrete 4. Figure 5 and Figure 6 As shown, the outer cross-section shape of the prefabricated hollow composite pier 1 in this embodiment is circular, and the prefabricated hollow composite pier 1 includes a corrugated steel pipe 11 and a concrete layer 14; the corrugated steel pipe 11 adopts a circular galvanized corrugated steel pipe, and the concrete layer 14 is wrapped around the outer periphery of the corrugated steel pipe 11.

[0029] The ribs of the corrugated steel pipe 11 are transverse ribs, and the corrugations are sinusoidal. A single layer of longitudinal reinforcement 12 and spiral stirrups 13 are arranged in the concrete layer 14. The bottom end of the longitudinal reinforcement 12 extends out of the bottom surface of the prefabricated hollow composite pier 1 and is inserted into the foundation 2. The outer peripheral side of the extended part of the longitudinal reinforcement 12 is reserved with an unbonded section of 3 times its own diameter to improve the energy dissipation capacity of the pier, and the unbonded section is formed by an outer plastic sleeve.

[0030] like Figure 2 and 3 As shown, a steel bar anchor hole 22 and an anchor bar 21 are provided on the foundation 2, and the steel bar anchor hole 22 corresponds to the extended portion of the longitudinal bar 12 of the prefabricated hollow composite pier column 1; one end of the longitudinal bar 12 extending out of the prefabricated hollow composite pier column 1 is inserted into the steel bar anchor hole 22. The anchor bars 21 are distributed in a ring shape with equal intervals, and the diameter of the circumscribed circle of the outer surface of the anchor bar 21 is not greater than the minimum inner diameter of the corrugated steel pipe 11.

[0031] The seismic toughness column foot node of the prefabricated hollow composite pier column 1 is achieved by filling the steel bar anchor hole 22 of the foundation 2 with grouting material 3, inserting the extended longitudinal reinforcement 12 of the prefabricated hollow composite pier column 1 orthogonally into the steel bar anchor hole 22 of the foundation 2, and then pouring the post-cast concrete 4 in the galvanized corrugated steel pipe 11, so that the height of the post-cast concrete 4 is greater than 30 mm from the top of the anchor bar 21.

[0032] The inner diameter of the steel bar anchor hole 22 of the foundation 2 is 5 mm larger than the outer diameter of the longitudinal bar inserted into the steel bar anchor hole; the steel bar anchor hole 22 is made of pre-buried corrugated steel pipe; the length of the anchor bar 21 inserted into the circular corrugated steel pipe 11 of the prefabricated hollow composite pier 1 is not less than the seismic anchoring length of the anchor bar 21 inserted into the foundation 2; the strength grade of the post-cast concrete 4 is higher than the strength of the concrete layer 14 of the prefabricated hollow composite pier 1, and the post-cast concrete 4 adopts self-compacting concrete.

[0033] Embodiment 2:

[0034] The invention discloses a seismic toughness column foot node for prefabricated hollow composite pier columns.

[0035] Referring to the figure, a seismic toughness column foot node for a prefabricated hollow composite pier column includes a prefabricated hollow composite pier column 1, a foundation 2, a grouting material 3 and a post-cast concrete 4. Figure 5 and Figure 7 As shown, in this embodiment, the outer cross-section of the prefabricated hollow composite pier 1 is rectangular, and the prefabricated hollow composite pier 1 includes a corrugated steel pipe 11 and a concrete layer 14; the corrugated steel pipe 11 adopts a circular galvanized corrugated steel pipe, and the concrete layer 14 is wrapped around the outer periphery of the galvanized corrugated steel pipe 11.

[0036] The ribs of the galvanized corrugated steel pipe 11 are oblique ribs, and the corrugations are sinusoidal. A single layer of longitudinal reinforcement 12 and spiral stirrups 13 are arranged in the concrete layer 14. The bottom end of the longitudinal reinforcement 12 extends out of the bottom surface of the prefabricated hollow composite pier 1 and is inserted into the foundation 2. The outer peripheral side of the extended part of the longitudinal reinforcement 12 is reserved with an unbonded section of 5 times its own diameter to improve the energy dissipation capacity of the pier, and the unbonded section is formed by an outer plastic sleeve.

[0037] like Figure 2 and 4 As shown, a steel bar anchor hole 22 and an anchor bar 21 are provided on the foundation 2, and the steel bar anchor hole 22 corresponds to the extended portion of the longitudinal bar 12 of the prefabricated hollow composite pier column 1; one end of the longitudinal bar 12 extending out of the prefabricated hollow composite pier column 1 is inserted into the steel bar anchor hole 22. The anchor bars 21 are distributed in a ring shape with equal intervals, and the diameter of the circumscribed circle of the outer surface of the anchor bar 21 is not greater than the minimum inner diameter of the corrugated steel pipe 11.

[0038] The seismic toughness column foot node of the prefabricated hollow composite pier column 1 is achieved by filling the steel bar anchor hole 22 of the foundation 2 with grouting material 3, inserting the extended longitudinal reinforcement 12 of the prefabricated hollow composite pier column 1 orthogonally into the steel bar anchor hole 22 of the foundation 2, and then pouring the post-cast concrete 4 in the galvanized corrugated steel pipe 11, so that the height of the post-cast concrete 4 is greater than 25m from the top of the anchor bar 21.

[0039] The plastic hinge area of ​​the prefabricated hollow composite pier column 1 is filled with post-cast concrete 4, which can improve the bearing capacity and stiffness of the plastic hinge area, and the round galvanized corrugated steel pipe 11 can well restrain the post-cast concrete, thereby significantly improving the seismic deformation resistance of the column foot node.

[0040] The circular galvanized corrugated steel pipe 11 of the prefabricated hollow composite pier 1 adopts a special corrugated structure, which can well improve the interface force transmission performance between the post-cast concrete 4 and the prefabricated hollow composite pier 1, and efficiently transfer the pier load to the post-cast concrete 4 and the anchor bars 21 of the foundation 2; improve the seismic bearing capacity of the column foot node. In addition, the circular galvanized corrugated steel pipe 11 can serve as the inner template for the prefabricated forming of the pier, and the use of the corrugated steel pipe 11 to replace the inner row of steel bars of the traditional hollow pier can significantly improve the production efficiency of the prefabricated pier; the large out-of-plane stiffness of the corrugated steel pipe 11 can prevent the inward deformation of the hollow pier and improve the seismic performance of the prefabricated pier.

[0041] The inner diameter of the steel bar anchor hole 22 of the foundation 2 is 10 mm larger than the outer diameter of the longitudinal bar inserted into the steel bar anchor hole; the steel bar anchor hole 22 is made of a pre-buried corrugated steel pipe. The length of the anchor bar 21 inserted into the circular corrugated steel pipe 11 is not less than the seismic anchoring length of the anchor bar 21 inserted into the foundation 2; the strength grade of the post-cast concrete 4 is higher than the strength of the concrete layer 14 of the prefabricated hollow composite pier 1, and the post-cast concrete 4 uses ultra-high performance concrete. The extended longitudinal bars 12 and anchor bars 21 of the pier yield in batches. After the extended longitudinal bars 12 yield, the anchor bars 21 can provide the later stiffness of the column foot node, reduce the residual deformation of the column foot node after the earthquake, and thus improve the seismic toughness of the column foot node.

[0042] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A seismic toughness column foot node for prefabricated hollow composite pier columns, characterized in that: The invention comprises a prefabricated hollow composite pier column (1), a foundation (2), a grouting material (3) and post-cast concrete (4); the prefabricated hollow composite pier column (1) is connected to the foundation (2); the prefabricated hollow composite pier column (1) comprises a corrugated steel pipe (11) and a concrete layer (14), wherein the concrete layer (14) is wrapped around the outer periphery of the corrugated steel pipe (11); longitudinal reinforcement (12) and stirrups (13) are arranged in the concrete layer (14); the bottom end of the longitudinal reinforcement (12) extends out of the bottom surface of the prefabricated hollow composite pier column (1) and is inserted into the foundation (2); The foundation (2) is provided with a steel bar anchor hole (22) and an anchor bar (21), the steel bar anchor hole (22) corresponds to the protruding portion of the longitudinal bar (12) of the prefabricated hollow composite pier column (1), and one end of the longitudinal bar (12) protruding from the prefabricated hollow composite pier column (1) is inserted into the steel bar anchor hole (22); the anchor bars (21) are distributed in a ring shape at equal intervals, and the diameter of the circumscribed circle of the outer surface of the anchor bar (21) is not greater than the minimum inner diameter of the corrugated steel pipe (11); The seismic toughness column foot node of the prefabricated hollow composite pier column (1) is prepared by filling a grouting material (3) into a steel bar anchor hole (22) of a foundation (2), inserting the extended longitudinal reinforcement (12) of the prefabricated hollow composite pier column (1) orthogonally into the steel bar anchor hole (22) of the foundation (2), and then pouring the post-cast concrete (4) into the corrugated steel pipe (11), so that the height of the post-cast concrete (4) is greater than the top of the anchor bar (21) by 20-50 mm.

2. The seismic toughness column foot node for prefabricated hollow composite pier column according to claim 1, characterized in that: The corrugated steel pipe (11) is a circular galvanized corrugated steel pipe (11), the ribs of the corrugated steel pipe (11) are transverse ribs or oblique ribs, and the corrugations are sinusoidal waves, trapezoidal waves or rectangular waves.

3. The seismic toughness column foot node for prefabricated hollow composite pier column according to claim 1, characterized in that: The longitudinal reinforcement (12) and stirrups (13) of the concrete layer (14) of the prefabricated hollow composite pier (1) are single-layer or double-layer, and the stirrups (13) are spiral stirrups (13).

4. A seismic toughness column foot node for prefabricated hollow composite pier columns according to any one of claims 1 to 3, characterized in that: The extended portion of the longitudinal reinforcement (12) in the prefabricated hollow composite pier (1) is reserved with a non-bonded section of 1 to 5 times the diameter of the longitudinal reinforcement, and the non-bonded section is formed by an external plastic casing or an external steel casing.

5. The seismic toughness column foot node for prefabricated hollow composite pier column according to claim 4, characterized in that: The inner diameter of the steel bar anchor hole (22) in the foundation (2) is greater than the outer diameter of the longitudinal reinforcement (12) inserted into the steel bar anchor hole (22) by more than 5 mm, and the steel bar anchor hole (22) is formed by pre-buried corrugated steel pipe (11).

6. The seismic toughness column foot node for prefabricated hollow composite pier column according to claim 5, characterized in that: The length of the anchor bar (21) inserted into the corrugated steel pipe (11) of the prefabricated hollow composite pier (1) is not less than the anchoring length of the anchor bar (21) inserted into the foundation (2).

7. The seismic toughness column foot node for prefabricated hollow composite pier column according to claim 1, characterized in that: The strength grade of the post-cast concrete (4) is higher than the strength of the concrete layer (14) of the prefabricated hollow composite pier (1), and the post-cast concrete (4) is one of self-compacting concrete, high-strength concrete and ultra-high performance concrete.

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