A damage-controlled bidirectional wave-forming composite steel tube concrete hollow bridge pier

Abstract

The present invention relates to a damage-controlled bidirectional waved composite steel tube concrete hollow bridge pier, comprising: an outer waved tubular structure, an inner waved tubular structure and a steel mesh; the outer waved tubular structure comprises an outer steel pipe and an outer waved steel pipe; the inner waved tubular structure comprises an inner steel pipe and an inner waved steel pipe; the raised end of the outer waved steel pipe faces the outside of the pier, and the raised end of the inner waved steel pipe faces the inside of the pier. The beneficial effects of the present invention are: it can be mass-produced, cut into specified lengths after production, and is convenient for transportation to the site for installation and pouring of concrete; a steel mesh is provided in the sandwich concrete, so that the pier has multiple force effects and further enhances the circumferential constraint effect; the inner and outer steel pipes are respectively connected to the inner and outer waved steel pipes by bolts, which can effectively resist the expansion of concrete during solidification; the spacing between the inner and outer waved steel pipes is limited to avoid the formation of short columns in the pier.

Description

Technical Field

[0001] The present invention belongs to the field of double steel tube concrete bridge piers, and in particular relates to a damage-controllable bidirectional wave-forming composite steel tube concrete hollow bridge pier. Background Art

[0002] Hollow concrete-filled steel tube bridge piers are hollow steel tube concrete piers. They are lightweight and economical, featuring a small cross-sectional area, large cross-sectional moment resistance, light weight, good structural rigidity, and load-bearing capacity. They are widely used in highway and railway construction, particularly for high-rise bridge piers. Compared to traditional solid piers, hollow piers generally reduce concrete consumption by 40% to 60%.

[0003] In my country's mountainous highway and railway construction, high bridge piers account for a large proportion due to the varying terrain. Pier heights often exceed 50 meters, and some even exceed 100 meters. Hollow piers are the most widely used pier type for these applications, due to their economical, aesthetic, practical, and lightweight design. They offer excellent economical performance, achieve a high cross-sectional moment of resistance with less material, and offer high cross-sectional stiffness and excellent overall integrity.

[0004] The existing double steel tube concrete piers have the following main problems:

[0005] 1) When the inner and outer steel pipes are under axial compression, that is, when there is a large axial stress, the expansion of the concrete causes a large hoop stress in the steel pipes. Therefore, the inner and outer steel pipes are in a state of high bidirectional stress and are prone to axial local buckling.

[0006] 2) Considering the fire resistance performance, in the case of fire, the CFST pier column will expand at high temperature, causing the axial stress of the outer steel tube to increase rapidly, which is more likely to cause the outer steel tube to undergo axial local buckling. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a damage-controllable bidirectional wave composite steel tube concrete hollow bridge pier.

[0008] The damage-controlled bidirectional waved composite steel tube concrete hollow bridge pier comprises: an outer waved tubular structure, an inner waved tubular structure and a steel mesh; the outer waved tubular structure comprises an outer steel pipe and an outer waved steel pipe, and several sections of the outer steel pipe and the outer waved steel pipe are sequentially connected in the direction of the pier height; the inner waved tubular structure comprises an inner steel pipe and an inner waved steel pipe, and several sections of the inner steel pipe and the inner waved steel pipe are sequentially connected in the direction of the pier height; the convex end of the outer waved steel pipe faces the outside of the pier, and the convex end of the inner waved steel pipe faces the inside of the pier;

[0009] A sandwich concrete is provided between the outer wave-forming tubular structure and the inner wave-forming tubular structure, wherein a steel mesh is embedded in the sandwich concrete; the steel mesh is fixedly connected to the outer wave-forming tubular structure by outer connecting bolts, and the steel mesh is fixedly connected to the inner wave-forming tubular structure by inner connecting bolts.

[0010] Preferably, the length L1 of the outer corrugated steel pipe in the height direction of the pier is 5 to 10 times the thickness of the outer steel pipe, and the length L2 of the inner corrugated steel pipe in the height direction is 5 to 10 times the thickness of the inner steel pipe.

[0011] As a preference: one end of the outer connecting bolt is welded to the steel mesh, and the other end passes through the outer steel pipe and the corresponding end of the outer corrugated steel pipe in sequence and is fixed by a nut; one end of the inner connecting bolt is welded to the steel mesh, and the other end passes through the inner steel pipe and the corresponding end of the inner corrugated steel pipe in sequence and is fixed by a nut.

[0012] As a preferred embodiment, the outer corrugated steel pipe and the inner corrugated steel pipe are staggered in the height direction of the pier, and the outer connecting bolts and the inner connecting bolts are also staggered.

[0013] Preferably, the height difference between the center points of the outer corrugated steel pipe and the inner corrugated steel pipe below is H1, and H1 is greater than 4 times the thickness of the interlayer concrete; the height difference between the center points of the inner corrugated steel pipe and the outer corrugated steel pipe below is H2, and H2 is greater than 4 times the thickness of the interlayer concrete.

[0014] Preferably: H1>H2.

[0015] The construction method of the damage-controllable bidirectional wave composite steel tube concrete hollow bridge pier comprises the following steps:

[0016] Step 1: Determine the number and position of outer corrugated steel pipes and inner corrugated steel pipes according to the pier height and the thickness of the interlayer concrete;

[0017] Step 2: Pressing the corrugated shapes of the outer corrugated steel pipe and the inner corrugated steel pipe on the steel plate, cutting the steel plate and rolling it into steel pipes, and then welding them to form the outer corrugated steel pipe and the inner corrugated steel pipe;

[0018] Step 3: Connect the outer steel pipe and the outer corrugated steel pipe to form an outer corrugated tubular structure, connect the inner steel pipe and the inner corrugated steel pipe to form an inner corrugated tubular structure, and connect the outer corrugated tubular structure and the inner corrugated tubular structure to the steel mesh respectively through the outer connecting bolts and the inner connecting bolts;

[0019] Step 4: Pour interlayer concrete between the outer corrugated tubular structure and the inner corrugated tubular structure until the interlayer concrete completely fills the interlayer between the outer corrugated tubular structure and the inner corrugated tubular structure, and the steel mesh is immersed in the interlayer concrete, thereby forming a damage-controlled bidirectional corrugated composite steel tube concrete hollow bridge pier.

[0020] Preferably, in step three: one end of the outer layer connecting bolts and the inner layer connecting bolts is bent, and then the bent ends of the outer layer connecting bolts and the inner layer connecting bolts are welded to the steel mesh.

[0021] The beneficial effects of the present invention are:

[0022] 1) The outer steel pipe, inner steel pipe, outer corrugated steel pipe and inner corrugated steel pipe in the patent of this invention can be produced on a large scale. After production, they are cut into specified lengths for easy transportation to the site for installation and pouring of concrete, which is conducive to quality control, high production efficiency and environmental protection.

[0023] 2) The present invention provides a steel mesh in the sandwich concrete to share the load, so that the bridge pier has multiple force effects and achieves double protection; the steel mesh also plays the role of fixing the inner and outer corrugated tubular structures, further enhancing the circumferential constraint effect, reducing the axial stress of the inner corrugated tubular structure under axial pressure or eccentric force, and reducing or even eliminating the degree of axial local buckling generated by the inner and outer corrugated tubular structures, thereby improving the strength and service life of the bridge pier.

[0024] 3) The inner and outer steel pipes in the patent of the present invention are respectively connected to the inner and outer corrugated steel pipes by bolts, which can effectively resist the expansion of concrete during the setting process and have good fire resistance and high temperature resistance.

[0025] 4) The spacing between the inner and outer corrugated steel pipes is restricted so that the spacing between the outer and inner corrugated steel pipes is greater than 4 times the thickness of the interlayer concrete, to avoid the formation of short columns in the local area of ​​the pier, which would cause the stiffness of the part to be too high and shear failure to occur.

[0026] 5) The inner and outer corrugated steel pipes increase the cross-sectional area at certain height positions of the pier, thereby improving the bending stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic top view of the damage-controllable bidirectional wave composite steel tube concrete hollow bridge pier of the present invention;

[0028] Figure 2 The cross-sectional diagram of the damage-controlled bidirectional wave composite steel tube concrete hollow bridge pier;

[0029] Figure 3 This is a schematic diagram of the overall structure of the present invention applied to bridge engineering;

[0030] Figure 4 This is the connection detail construction drawing of the outer corrugated steel pipe, outer steel pipe and steel mesh.

[0031] Explanation of the accompanying symbols: outer layer steel pipe 1, outer layer corrugated steel pipe 2, outer layer connecting bolts 3, steel mesh 4, sandwich concrete 5, inner layer connecting bolts 6, inner layer steel pipe 7, inner layer corrugated steel pipe 8. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the following examples. The following examples are provided only to facilitate understanding of the present invention. It should be noted that, without departing from the principles of the present invention, it is possible for a person skilled in the art to make various modifications to the present invention, and such improvements and modifications fall within the scope of the claims of the present invention.

[0033] As an example, Figures 1 to 4 As shown, this damage-controlled bidirectional waved composite steel tube concrete hollow bridge pier includes: an outer waved tubular structure, an inner waved tubular structure and a steel mesh 4; the outer waved tubular structure includes an outer steel pipe 1 and an outer waved steel pipe 2, and several sections of the outer steel pipe 1 and the outer waved steel pipe 2 are connected in sequence in the height direction of the pier; the inner waved tubular structure includes an inner steel pipe 7 and an inner waved steel pipe 8, and several sections of the inner steel pipe 7 and the inner waved steel pipe 8 are connected in sequence in the height direction of the pier; the raised end of the outer waved steel pipe 2 faces the outside of the pier, and the raised end of the inner waved steel pipe 8 faces the inside of the pier; the length L1 of the outer waved steel pipe 2 in the height direction of the pier is 5 to 10 times the thickness of the outer steel pipe 1, and the length L2 of the inner waved steel pipe 8 in the height direction is 5 to 10 times the thickness of the inner steel pipe 7.

[0034] like Figure 3 As shown, the outer corrugated steel tube 2 and the inner corrugated steel tube 8 are staggered in the height direction of the pier. The height difference between the center points of the outer corrugated steel tube 2 and the inner corrugated steel tube 8 below is H1, and the height difference between the center points of the inner corrugated steel tube 8 and the outer corrugated steel tube 2 below is H2. Both H1 and H2 are greater than 4 times the thickness of the interlayer concrete 5, and H1 is greater than H2, so as to avoid the formation of short columns in the local area of ​​the pier, resulting in excessive stiffness of this part and shear failure.

[0035] like Figures 2 to 4 As shown, a sandwich concrete 5 is provided between the outer wave-forming tubular structure and the inner wave-forming tubular structure, wherein the steel mesh 4 is buried in the sandwich concrete 5; there is no concrete poured inside the inner wave-forming tubular structure, which is a hollow structure; the cross-sectional shape of the sandwich concrete 5 at different heights is determined by the closed geometric shape formed by the outer wave-forming tubular structure and the inner wave-forming tubular structure at the height position. Compared with the traditional concrete hollow piers, the outer wave-forming steel pipe 2 and the inner wave-forming steel pipe 8 increase the concrete cross-sectional area at some height positions, thereby improving the bending resistance of the piers.

[0036] The steel mesh 4 is fixed to the outer corrugated tubular structure via outer connecting bolts 3, which in turn are fixed to the inner corrugated tubular structure via inner connecting bolts 6. Specifically, one end of the outer connecting bolt 3 is welded to the steel mesh 4, while the other end passes through the ends of the outer steel tube 1 and the corresponding outer corrugated steel tube 2, and is secured with a nut. The inner connecting bolt 6 is welded to the steel mesh 4 at one end, while the other end passes through the ends of the inner steel tube 7 and the corresponding inner corrugated steel tube 8, and is secured with a nut, further enhancing the circumferential restraint on the sandwich concrete 5. The steel mesh 4 effectively shares the load-bearing capacity, giving the composite steel tube concrete hollow bridge pier multiple stress effects and achieving dual protection.

[0037] The outer connecting bolts 3 and the inner connecting bolts 6 are also staggered. The outer connecting bolts 3 and the inner steel pipe 7 have no direct connection, and the inner connecting bolts 6 and the outer steel pipe 1 have no direct connection.

[0038] The construction method of the damage-controllable bidirectional wave composite steel tube concrete hollow bridge pier comprises the following steps:

[0039] Step 1: Determine the number and position of the outer corrugated steel pipes 2 and the inner corrugated steel pipes 8 according to the pier height and the thickness of the sandwich concrete 5;

[0040] Step 2: Extrude the corrugated shapes of the outer corrugated steel tube 2 and the inner corrugated steel tube 8 on the steel plate, cut the steel plate and roll it into steel tubes, and then weld them to form the outer corrugated steel tube 2 and the inner corrugated steel tube 8; the steel plate used complies with the American Steel Structure Standard AISI, and can be corrosion-resistant for 50 to 100 years, with good durability;

[0041] Step 3: Connect the outer steel pipe 1 and the outer corrugated steel pipe 2 to form an outer corrugated tubular structure, connect the inner steel pipe 7 and the inner corrugated steel pipe 8 to form an inner corrugated tubular structure, bend one end of the outer connecting bolt 3 and the inner connecting bolt 6, and then weld the bent ends of the outer connecting bolt 3 and the inner connecting bolt 6 to the steel mesh 4, and connect the outer corrugated tubular structure and the inner corrugated tubular structure to the steel mesh 4 respectively through the outer connecting bolt 3 and the inner connecting bolt 6;

[0042] Step 4: Pour interlayer concrete 5 between the outer corrugated tubular structure and the inner corrugated tubular structure until the interlayer concrete 5 completely fills the interlayer between the outer corrugated tubular structure and the inner corrugated tubular structure, and the steel mesh 4 is immersed in the interlayer concrete 5, thereby forming a damage-controllable bidirectional corrugated composite steel tube concrete hollow bridge pier.

Claims

1. A damage-controlled bidirectional wave composite steel tube concrete hollow bridge pier, characterized in that: include: An outer corrugated tubular structure, an inner corrugated tubular structure and a steel mesh (4); the outer corrugated tubular structure comprises an outer steel pipe (1) and an outer corrugated steel pipe (2), and several sections of the outer steel pipe (1) and the outer corrugated steel pipe (2) are sequentially connected in the direction of the height of the pier; the inner corrugated tubular structure comprises an inner steel pipe (7) and an inner corrugated steel pipe (8), and several sections of the inner steel pipe (7) and the inner corrugated steel pipe (8) are sequentially connected in the direction of the height of the pier; the convex end of the outer corrugated steel pipe (2) faces the outer side of the pier, and the convex end of the inner corrugated steel pipe (8) faces the inner side of the pier; A sandwich concrete (5) is provided between the outer wave-generating tubular structure and the inner wave-generating tubular structure, wherein a steel mesh (4) is embedded in the sandwich concrete (5); the steel mesh (4) is fixedly connected to the outer wave-generating tubular structure via outer layer connecting bolts (3), and the steel mesh (4) is fixedly connected to the inner wave-generating tubular structure via inner layer connecting bolts (6); One end of the outer layer connecting bolt (3) is welded to the steel mesh (4), and the other end sequentially penetrates the end of the outer layer steel pipe (1) and the corresponding outer layer corrugated steel pipe (2) and is fixed by a nut; one end of the inner layer connecting bolt (6) is welded to the steel mesh (4), and the other end sequentially penetrates the end of the inner layer steel pipe (7) and the corresponding inner layer corrugated steel pipe (8) and is fixed by a nut; The outer corrugated steel pipe (2) and the inner corrugated steel pipe (8) are staggered in the height direction of the pier, and the outer connecting bolts (3) and the inner connecting bolts (6) are also staggered; The height difference between the center points of the outer corrugated steel pipe (2) and the inner corrugated steel pipe (8) below is H1, and H1 is greater than 4 times the thickness of the sandwich concrete (5); the height difference between the center points of the inner corrugated steel pipe (8) and the outer corrugated steel pipe (2) below is H2, and H2 is greater than 4 times the thickness of the sandwich concrete (5); H1 is greater than H2.

2. The damage-controlled bidirectional wave-forming composite steel tube concrete hollow bridge pier according to claim 1 is characterized by: The length L1 of the outer corrugated steel pipe (2) in the height direction of the pier is 5 to 10 times the thickness of the outer steel pipe (1), and the length L2 of the inner corrugated steel pipe (8) in the height direction is 5 to 10 times the thickness of the inner steel pipe (7).

3. The construction method of the damage-controlled bidirectional wave composite steel tube concrete hollow bridge pier according to claim 1 is characterized in that: The following steps are involved: Step 1: Determine the number and position of the outer corrugated steel pipe (2) and the inner corrugated steel pipe (8) according to the height of the bridge pier and the thickness of the sandwich concrete (5); Step 2: Pressing the corrugated shapes of the outer corrugated steel tube (2) and the inner corrugated steel tube (8) on the steel plate, cutting the steel plate and rolling it into steel tubes, and then welding them to form the outer corrugated steel tube (2) and the inner corrugated steel tube (8); Step 3: Connect the outer steel pipe (1) and the outer corrugated steel pipe (2) to form an outer corrugated tubular structure, connect the inner steel pipe (7) and the inner corrugated steel pipe (8) to form an inner corrugated tubular structure, and connect the outer corrugated tubular structure and the inner corrugated tubular structure to the steel mesh (4) respectively through the outer connecting bolts (3) and the inner connecting bolts (6); Step 4: pour interlayer concrete (5) between the outer corrugated tubular structure and the inner corrugated tubular structure until the interlayer concrete (5) completely fills the interlayer between the outer corrugated tubular structure and the inner corrugated tubular structure, and the steel mesh (4) is immersed in the interlayer concrete (5), thereby forming a damage-controlled bidirectional corrugated composite steel tube concrete hollow bridge pier.

4. The construction method of the damage-controlled bidirectional wave composite steel tube concrete hollow bridge pier according to claim 3 is characterized in that: In step three: one end of the outer connecting bolt (3) and the inner connecting bolt (6) is bent, and then the bent ends of the outer connecting bolt (3) and the inner connecting bolt (6) are welded to the steel mesh (4).

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