A bidirectional wave hollow steel tube concrete bridge pier and its construction technology

Abstract

The present invention relates to a bidirectional corrugated hollow steel tube concrete bridge pier and its construction process, comprising an outer corrugated steel tube, an interlayer concrete and an inner corrugated steel tube; the outer corrugated steel tube is provided with several outer corrugations along the height direction of the pier, and the inner corrugated steel tube is provided with several inner corrugations along the height direction of the pier; the outer corrugations face the outside of the pier, the inner corrugations face the inside of the pier, and the heights of the outer corrugations and the inner corrugations are staggered. The beneficial effects of the present invention are as follows: the outer corrugated steel tube and the inner corrugated steel tube can be produced on a large scale; the outer corrugated steel tube and the inner corrugated steel tube can be used as formwork and can effectively resist the expansion during the setting process of concrete, and the whole process does not require the formwork to be dismantled; the inner and outer corrugated steel tubes can compensate for a part of the longitudinal deformation by themselves, do not bear vertical loads, and only play a circumferential constraint role, so the pier body has a good bearing capacity; the corrugations pressed out of the inner and outer steel tubes reduce the axial stress of the inner and outer corrugated steel tubes under axial pressure or eccentric force.

Description

Technical Field

[0001] The present invention belongs to the field of double steel tube concrete bridge piers, and in particular relates to a bidirectional waved hollow steel tube concrete bridge pier and a construction process thereof. 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 bidirectional waved hollow steel tube concrete bridge pier and a construction process thereof.

[0008] This bidirectional corrugated hollow steel tube concrete pier includes an outer corrugated steel tube, an interlayer concrete and an inner corrugated steel tube, wherein the interlayer concrete is arranged between the outer corrugated steel tube and the inner corrugated steel tube; the outer corrugated steel tube is provided with several outer corrugations along the height direction of the pier, and the inner corrugated steel tube is provided with several inner corrugations along the height direction of the pier; the outer corrugations are directed toward the outside of the pier, and the inner corrugations are directed toward the inside of the pier, and the heights of the outer corrugations and the inner corrugations are staggered.

[0009] As a preference, the outer corrugations are arc-shaped protrusions surrounding the outer corrugated steel pipe, and the inner corrugations are arc-shaped grooves surrounding the inner corrugated steel pipe.

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

[0011] Preferably, the height difference between the center point of the outer corrugation and the inner corrugation below is H1, H1>4 times the thickness of the sandwich concrete; the height difference between the center point of the inner corrugation and the outer corrugation below is H2, H2>4 times the thickness of the sandwich concrete.

[0012] Preferably: H1>H2.

[0013] The construction process of the bidirectional wave hollow steel tube concrete bridge pier includes the following steps:

[0014] Step 1: Determine the number and position of outer and inner corrugations based on the pier height and interlayer concrete thickness;

[0015] Step 2: Press one or more outer corrugations on the steel plate, then roll the steel plate into a steel tube, and weld it to form the outer corrugated steel tube; take another steel plate, press one or more inner corrugations according to the height of the bridge pier, then roll the steel plate into a steel tube, and weld it to form the inner corrugated steel tube;

[0016] Step 3: After placing and fixing the outer corrugated steel pipe and the inner corrugated steel pipe, pour the sandwich concrete; the sandwich concrete completely fills the sandwich between the outer corrugated steel pipe and the inner corrugated steel pipe, thereby forming a bidirectional corrugated hollow steel tube concrete bridge pier.

[0017] Preferably, in step 2: the outer corrugations and the inner corrugations are staggered in the height direction of the pier.

[0018] The beneficial effects of the present invention are:

[0019] 1) The outer corrugated steel pipe and the inner corrugated steel pipe in the patent of the present invention can be mass-produced and cut into specified lengths after production. The corrugated steel pipe itself has large planar rigidity, can withstand collisions during transportation and installation, and is almost not deformed, is not prone to initial defects, and is easy to transport to the site for hoisting into place and pouring concrete, which is conducive to quality control, high production efficiency and environmental protection.

[0020] 2) The present invention constrains concrete components through steel pipes. The outer corrugated steel pipes and the inner corrugated steel pipes can be used as formwork and can effectively resist the expansion of concrete during the setting process. The entire process does not require the formwork to be dismantled, which reduces multiple construction processes and simplifies the construction.

[0021] 3) The present invention obtains a bidirectional corrugated hollow steel tube concrete bridge pier with high bearing capacity, good durability, quick construction, convenient design and good economy. The bridge pier has strong bending rigidity; the inner and outer corrugated steel tubes themselves can compensate for part of the longitudinal deformation, do not bear vertical loads, and only play a circumferential constraint role. The pier body has good bearing capacity and the concrete strength is greatly improved. Even if gaps appear in some positions, it will not affect the bearing capacity of the pier column, which is convenient for improving the service life of the hollow bridge pier.

[0022] 4) The inner and outer layers of steel pipes are corrugated to reduce the axial stress of the inner and outer corrugated steel pipes under axial pressure or eccentric force, and reduce or even eliminate the degree of axial local buckling produced by the inner and outer corrugated steel pipes, thereby improving the strength of the hollow double steel tube concrete pier and having better fire resistance and high temperature resistance.

[0023] 5) The spacing between the inner and outer corrugations is restricted so that the spacing between any outer corrugation and the inner corrugation is greater than four times the thickness of the sandwich concrete, to avoid the formation of short columns in some parts of the pier, which would result in excessive stiffness in that part and cause shear failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the overall structural diagram of the bidirectional wave hollow steel tube concrete bridge pier of the present invention;

[0025] Figure 2 A top view of the bidirectionally waved hollow steel tube concrete bridge pier of the present invention;

[0026] Figure 3 This is a schematic diagram of the overall structure of the bidirectional wave hollow steel tube concrete pier of the present invention used in bridge engineering.

[0027] Explanation of the reference numerals: outer corrugated steel pipe 1, outer corrugation 2, sandwich concrete 3, inner corrugated steel pipe 4, inner corrugation 5. DETAILED DESCRIPTION

[0028] 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.

[0029] As an example, Figures 1 to 3As shown, a bidirectional corrugated hollow steel tube concrete bridge pier comprises an outer corrugated steel tube 1, an interlayer concrete 3, and an inner corrugated steel tube 4. The interlayer concrete 3 is disposed between the outer corrugated steel tube 1 and the inner corrugated steel tube 4. The outer corrugated steel tube 1 is provided with several outer corrugations 2 along the height of the pier, while the inner corrugated steel tube 4 is provided with several inner corrugations 5 along the height of the pier. The outer corrugations 2 are arc-shaped protrusions surrounding the outer corrugated steel tube 1, while the inner corrugations 5 are arc-shaped grooves surrounding the inner corrugated steel tube 4. The height length L1 of the outer corrugations 2 is 5 to 10 times the thickness of the outer corrugated steel tube 1, while the height length L2 of the inner corrugations 5 is 5 to 10 times the thickness of the inner corrugated steel tube 4. Both the outer corrugated steel tube 1 and the inner corrugated steel tube 4 comply with the American Standard for Steel Structures (AISI) and have a corrosion resistance of 50 to 100 years.

[0030] The outer corrugated steel pipe 1 and the inner corrugated steel pipe 4 can compensate for some longitudinal deformation and do not bear vertical loads, but only play a restraining role. Therefore, even if a gap appears in a certain position, it will not affect the bearing capacity of the pier, which helps to increase the service life of the hollow bridge pier and has good fire resistance. The outer corrugated steel pipe 1 and the inner corrugated steel pipe 4 have high in-plane rigidity. Even with a very thin wall thickness, they can withstand collisions during transportation and installation and are almost undeformed, making it less likely to produce initial defects.

[0031] The outer corrugation 2 faces the outside of the pier, while the inner corrugation 5 faces the inside. The outer and inner corrugations 2 and 5 are staggered in height. The height difference between the center points of the outer corrugation 2 and the inner corrugation 5 below is H1, which is greater than 4 times the thickness of the sandwich concrete 3. The height difference between the center points of the inner corrugation 5 and the outer corrugation 2 below is H2, which is greater than 4 times the thickness of the sandwich concrete 3. This prevents the formation of short columns in the pier, which would result in excessive stiffness and shear failure. Furthermore, H1 is greater than H2, preventing the formation of short columns in the pier and causing shear failure.

[0032] The construction process of the bidirectional wave hollow steel tube concrete bridge pier includes the following steps:

[0033] Step 1: Determine the number and position of the outer corrugation 2 and the inner corrugation 5 according to the pier height and the thickness of the sandwich concrete 3;

[0034] Step 2: Press one or more outer corrugations 2 onto the steel plate, then roll the steel plate into a steel tube and weld it to form the outer corrugated steel tube 1. Take another steel plate and press one or more inner corrugations 5 onto it according to the height of the pier. The inner corrugations 5 are staggered with the outer corrugations 2 in the height direction of the pier. The steel plate is then rolled into a steel tube and welded to form the inner corrugated steel tube 4.

[0035] Step 3: After placing and fixing the outer corrugated steel pipe 1 and the inner corrugated steel pipe 4 on the pier cap, pour the interlayer concrete 3; the interlayer concrete 3 completely fills the interlayer between the outer corrugated steel pipe 1 and the inner corrugated steel pipe 4, thereby forming a bidirectional corrugated hollow steel tube concrete pier.

Claims

1. A bidirectional wave hollow steel tube concrete bridge pier, characterized in that: include: An outer corrugated steel pipe (1), an interlayer concrete (3) and an inner corrugated steel pipe (4), wherein the interlayer concrete (3) is arranged between the outer corrugated steel pipe (1) and the inner corrugated steel pipe (4); the outer corrugated steel pipe (1) is provided with a plurality of outer corrugations (2) along the height direction of the pier, and the inner corrugations (4) are provided with a plurality of inner corrugations (5) along the height direction of the pier; the outer corrugations (2) face the outer side of the pier, and the inner corrugations (5) face the inner side of the pier, and the outer corrugations (2) and the inner corrugations (5) are staggered in height; The outer corrugation (2) is an arc-shaped protrusion surrounding the outer corrugated steel pipe (1), and the inner corrugation (5) is an arc-shaped groove surrounding the inner corrugated steel pipe (4); The length L1 of the outer corrugation (2) in the height direction is 5 to 10 times the thickness of the outer corrugated steel pipe (1), and the length L2 of the inner corrugation (5) in the height direction is 5 to 10 times the thickness of the inner corrugated steel pipe (4); The height difference between the center points of the outer corrugation (2) and the inner corrugation (5) below is H1, and H1 is greater than 4 times the thickness of the sandwich concrete (3); the height difference between the center points of the inner corrugation (5) and the outer corrugation (2) below is H2, and H2 is greater than 4 times the thickness of the sandwich concrete (3); H1 is greater than H2.

2. The construction process of the bidirectionally corrugated hollow steel tube concrete 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 corrugation (2) and the inner corrugation (5) according to the height of the pier and the thickness of the sandwich concrete (3); Step 2: Press one or more outer corrugations (2) on the steel plate, then roll the steel plate into a steel pipe, and weld it to form an outer corrugated steel pipe (1); take another steel plate, press one or more inner corrugations (5) according to the height of the bridge pier, then roll the steel plate into a steel pipe, and weld it to form an inner corrugated steel pipe (4); Step 3: After the outer corrugated steel pipe (1) and the inner corrugated steel pipe (4) are placed and fixed, the sandwich concrete (3) is poured; the sandwich concrete (3) completely fills the sandwich between the outer corrugated steel pipe (1) and the inner corrugated steel pipe (4), thereby forming a bidirectional corrugated hollow steel pipe concrete bridge pier.

3. The construction process of the bidirectional wave hollow steel tube concrete bridge pier according to claim 2 is characterized in that: In step 2: the outer corrugation (2) and the inner corrugation (5) are staggered in the height direction of the pier.

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