CN111962384A - Seismic bridge pier with built-in energy dissipation device and construction method thereof - Google Patents

Abstract

The invention discloses an anti-seismic pier with built-in energy dissipation devices and a construction method thereof, wherein the anti-seismic pier comprises a pier, pipe piles are arranged in the pier, a plurality of rows of shock-absorbing energy dissipation devices are arranged between the pier and the pipe piles, each row of shock-absorbing energy dissipation devices at least comprises a group of symmetrically arranged shock-absorbing energy dissipation devices, each shock-absorbing energy dissipation device comprises energy dissipation components which are distributed in a crossed mode, two ends of each energy dissipation component are respectively fixed on the inner walls of the pier and the pipe piles, each energy dissipation component comprises a group of symmetrically distributed cylinders and piston rods, pistons are arranged at the end parts of the piston rods, and air holes are. The invention has strong applicability; the shock resistance of the pier can be improved, the built-in damping energy dissipation device and the built-in steel pipe foam concrete pile can play a role in energy dissipation and shock absorption, reduce the displacement of the pier under the earthquake load and improve the shock resistance of the pier; when the earthquake is over, the air holes are removed or enter the air cylinder, so that the air pressure inside and outside the air cylinder is balanced, and no additional constant load is applied to the bridge pier.

Description

Seismic bridge pier with built-in energy dissipation device and construction method thereof

technical field

The invention relates to an anti-seismic bridge pier and a construction method thereof, in particular to an anti-seismic bridge pier with a built-in energy dissipation device and a construction method thereof.

Background technique

With the rapid development of my country's social economy, infrastructure construction continues to extend to remote mountainous areas. Bridge engineering plays an important role in traffic engineering. Bridge construction costs are high, and once damaged by an earthquake, it will cause huge losses. According to the existing seismic information, the seismic damage of bridge piers is the most common form of seismic damage in bridges. Bridge piers are the key components of bridge stress. The deformation of reinforced concrete piers caused by earthquakes will lead to disasters such as pier cracking, bridge falling, collision between beams and even bridge pier collapse, which seriously affects people's production and life.

In the current bridge design, bridge seismic resistance is an important design content and research direction. Increasing the shear strength, plastic capacity and energy dissipation capacity of bridge piers is one of the key technologies to improve the seismic performance of bridges. In the existing seismic design, the shear strength of the pier is improved by densifying the reinforcement at the place where the bending moment is large, but at the same time, the plasticity of the bridge is reduced, the energy dissipation of the bridge during earthquake is reduced, and the risk of brittle failure is increased. .

SUMMARY OF THE INVENTION

Purpose of the invention: The purpose of the present invention is to provide a seismic bridge pier with built-in energy dissipation device and a construction method thereof, which can improve the seismic performance of the bridge through external devices without changing the plasticity of the bridge.

Technical solution: The present invention includes a bridge pier, wherein a pipe pile is arranged in the bridge pier, and multiple rows of shock absorption and energy dissipation devices are arranged between the bridge pier and the pipe pile, and each row of shock absorption and energy dissipation devices includes at least one set of symmetrical arrangement. The shock absorption and energy dissipation device includes cross-distributed energy dissipation components, the two ends of the energy dissipation components are respectively fixed on the inner wall of the bridge pier and the pipe pile, and the energy dissipation component includes a set of The cylinder and the piston rod are symmetrically distributed, the end of the piston rod is provided with a piston, and the piston is provided with air holes.

A row of shock-absorbing and energy-dissipating devices is installed at the position of the maximum slope of the deflection deformation diagram of the bridge pier.

The part of the piston rod extending out of the cylinder is covered with a spring, which assists the cylinder to dissipate energy and prevents the bottom of the piston rod from colliding with the cylinder.

The two ends of the energy dissipation component are provided with hinged supports, and the hinged supports are welded with the pipe piles and connected with the bridge piers by bolts.

The pipe piles include steel pipe piles, and foam concrete is poured in the steel pipe piles, which can be performed simultaneously with the concrete pouring of the bridge piers without affecting the construction period.

The center of the steel pipe pile coincides with the center of the bridge pier.

The bottom of the steel pipe pile is poured or welded with the bridge pier foundation, and a rubber pad is placed between the top and the bridge support, which can promote the steel pipe pile to move with the bridge deck and generate energy dissipation.

The diameter of the steel pipe pile is 1/3 to 2/3 of the minimum inner diameter of the bridge pier.

The top of the bridge pier is provided with a bridge support, and the bottom is fixed on the bridge pier foundation.

A construction method for an anti-seismic bridge pier with built-in energy dissipation device, comprising the following steps:

(1) Determine the minimum size D of the inner diameter of the pier, the pouring height H of the pier at all levels and the diameter d of the steel pipe pile according to the engineering needs and the bearing capacity calculation, and determine the size of the shock absorption and energy dissipation device according to the size of the gap between the pier and the steel pipe pile ;

(2) During the construction of the bridge pier foundation, insert the steel pipe pile into the bridge pier foundation and pour concrete, and rigidly connect the steel pipe pile to the bridge pier foundation, and the height of the installed steel pipe pile is the same as that of the hollow pier poured in the first stage;

(3) Determine the installation position of the shock absorption and energy consumption devices. The distance between the upper and lower rows of shock absorption energy consumption devices is not less than (D-d), not more than 3 (D-d), and the shock absorption energy consumption devices located at the top or bottom are respectively The distance between the top or bottom of the bridge pier is not less than (D-d), not more than 3 (D-d);

(4) Construction of pier reinforcement, installation of pier formwork, and installation of hinged supports on the formwork through screws, pouring concrete into the formwork, pouring the hinged supports in concrete, and pouring foam concrete into the steel pipe pile at the same time. Weld another hinged support on the corresponding position of the steel pipe pile;

(5) After the pier of this level is removed from the formwork, install the shock absorption and energy dissipation device so that the piston is located in the middle position of the cylinder in the initial position;

(6) Install the next-level steel pipe pile, and repeat steps (1) to (5). After the installation of the last-level bridge pier is completed, install a rubber pad on the top of the steel pipe pile, and finally pour the bridge support.

Beneficial effects: the invention has strong applicability, and is not only suitable for cylindrical hollow piers, but also for hollow bridge piers with other cross-sections; it can improve the seismic capacity of the bridge pier, and the built-in shock absorption and energy dissipation device and the built-in steel pipe foam concrete pile can play a role in energy dissipation The effect of shock absorption reduces the displacement of the bridge pier under the earthquake load and improves the seismic performance of the bridge pier; it will not bring additional damage to the bridge pier. Additional constant loads are applied to the piers.

Description of drawings

1 is a cross-sectional view of a bridge pier of the present invention;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the schematic diagram of the shock absorption and energy dissipation device of the present invention;

FIG. 4 is a schematic diagram of an energy-consuming component of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, the present invention includes a hollow bridge pier 2, the top of the hollow bridge pier 2 is provided with a bridge support 1, and the bottom is provided with a bridge pier foundation 12, the hollow bridge pier 2 bears all the loads transmitted by the upper bridge support 1, and the hollow bridge pier 2 There are also multiple steel bars 7 poured inside. The hollow pier 2 is provided with a pipe pile. The pipe pile is composed of a steel pipe pile 3 and a cast-in-place foam concrete 4. It is placed in the hollow pier 2 and does not bear the upper load. Centers coincide. After the foam concrete 4 is stirred, it is poured into the steel pipe pile 3, which can be carried out simultaneously with the concrete pouring of the hollow bridge pier 2, and will not affect the construction period. The bottom of the steel pipe pile 3 is fixedly connected with the bridge pier foundation 12, which can be poured or welded; a rubber pad 6 is placed between the top and the bridge support 1, which can promote the steel pipe pile 3 to move with the bridge deck, resulting in energy dissipation. The diameter of the steel pipe pile 3 is between 1/3 and 2/3 of the minimum inner diameter of the hollow pier 2 .

Multiple rows of shock absorption and energy dissipation devices are arranged in the gap between the hollow pier 2 and the pipe pile, and the size of the selected shock absorption and energy dissipation device 5 is determined according to the size of the gap. Each row of shock-absorbing and energy-consuming devices includes at least a set of symmetrically arranged shock-absorbing and energy-consuming devices 5. As shown in FIG. 3, the shock-absorbing and energy-consuming devices 5 include cross-hinged energy-consuming components, and both ends of the energy-consuming components are respectively fixed on On the inner wall of the bridge pier and the steel pipe pile 3, as shown in Figure 4, the energy dissipation component includes a set of symmetrically distributed cylinders 8 and piston rods 11. The end of the piston rod 11 is provided with a piston 13, and the piston 13 is provided with air holes. The cylinder 8 is hingedly connected with the hinged support 12. The piston rod 11 is placed in the cylinder 8 and can slide along the cylinder 8. The length of the piston rod 11 should be suitable for the depth of the cylinder 8, neither too long nor too short. The part of the piston rod 11 extending out of the cylinder 8 is covered with a high stiffness spring 9 , which assists the cylinder 8 to dissipate energy and at the same time prevents the bottom of the piston rod 11 from colliding with the cylinder 8 . Both ends of the energy dissipation component are hinged with hinged supports 12, and the hinged supports 12 are respectively fixed on the inner walls of the steel pipe pile 3 and the hollow bridge pier 2, and can be welded with the steel pipe pile 3, and can pass through the hollow bridge pier 2. The studs are cast in concrete.

A row of shock-absorbing and energy-dissipating devices 5 is installed at the position with the maximum slope of the pier deflection deformation diagram, and the distance between the upper and lower rows of the shock-absorbing and energy-dissipating devices 5 is not less than (D-d) and not greater than 3 (D-d) according to the distance between the upper and lower rows. Distance installation; the distance between the shock absorption and energy dissipation device 5 at the top or the bottom and the top or bottom of the hollow pier 2 is not less than (D-d) and not more than 3 (D-d).

A certain volume of gas is enclosed between the piston 13 and the cylinder 8, and a small amount of air holes are arranged on the piston 13. The air holes should be suitable so that when the hinged support 10 transmits the dynamic load, the air cannot be discharged or entered into the cylinder 8, and the air is compressed or pulled. When the hinged support 10 transmits a large constant load, the gas can be slowly discharged through the air hole or enter the cylinder 8, and finally the air pressure inside and outside the cylinder 8 is almost the same, not like the steel pipe pile 3 or hollow pier 2 to apply additional load.

The anti-seismic working principle of the present invention is as follows: when the inertial force generated by the earthquake acts on the bridge pier, the hollow bridge pier 2 and the steel pipe pile 3 are deformed. Due to the different quality and top construction methods of the steel pipe pile 3 and the hollow bridge pier 2, the relative displacement between the two causes the piston 13 to slide relatively in the cylinder 8, doing work on the gas in the cylinder 8, resulting in energy dissipation; when the earthquake ends , Expel or enter the cylinder 8 through the air hole, so that the air pressure inside and outside the cylinder 8 is balanced, and no additional constant load is applied to the bridge pier; energy dissipation.

A construction method for an anti-seismic bridge pier with built-in energy dissipation device, comprising the following steps:

(1) Determine the minimum size D of the inner diameter of the pier, the pouring height H of the pier at all levels and the diameter d of the steel pipe pile according to the engineering needs and the bearing capacity calculation, and determine the size of the shock absorption and energy dissipation device according to the size of the gap between the pier and the steel pipe pile ;

(2) During the construction of the bridge pier foundation, insert the steel pipe pile into the bridge pier foundation and pour concrete, and rigidly connect the steel pipe pile to the bridge pier foundation, and the height of the installed steel pipe pile is the same as that of the hollow pier poured in the first stage;

(3) Determine the installation position of the shock absorption and energy consumption devices. The distance between the upper and lower rows of shock absorption energy consumption devices is not less than (D-d), not more than 3 (D-d), and the shock absorption energy consumption devices located at the top or bottom are respectively The distance between the top or bottom of the bridge pier is not less than (D-d), not more than 3 (D-d);

(4) Construction of pier reinforcement, installation of pier formwork, and installation of hinged supports on the formwork through screws, pouring concrete into the formwork, pouring the hinged supports in concrete, and pouring foam concrete into the steel pipe pile at the same time. Weld another hinged support on the corresponding position of the steel pipe pile;

(5) After the pier of this level is removed from the formwork, install the shock absorption and energy dissipation device so that the piston is located in the middle position of the cylinder in the initial position;

(6) Install the next-level steel pipe pile, and repeat steps (1) to (5). After the installation of the last-level bridge pier is completed, install a rubber pad on the top of the steel pipe pile, and finally pour the bridge support.

Claims (10)

1. An anti-seismic bridge pier with a built-in energy dissipation device, comprising a bridge pier (2), wherein a pipe pile is provided in the described bridge pier (2), and it is characterized in that, there are multiple piers between the described bridge pier (2) and the pipe pile. Row of shock-absorbing and energy-consuming devices, each row of shock-absorbing and energy-consuming devices includes at least a set of symmetrically arranged shock-absorbing and energy-consuming devices (5), and the shock-absorbing energy-consuming devices (5) include cross-distributed energy-consuming components, so The two ends of the energy dissipation assembly are respectively fixed on the bridge pier (2) and the inner wall of the pipe pile, and the energy dissipation assembly includes a set of symmetrically distributed cylinders (8) and piston rods (11). A piston (13) is arranged on the part of the piston (13), and air holes are arranged on the piston (13). 2 . The anti-seismic bridge pier with built-in energy dissipation device according to claim 1 , wherein a row of shock absorption and energy dissipation devices ( 5 ) is installed at the position of the maximum slope of the deflection deformation diagram of the bridge pier ( 2 ). 3 . 3 . The anti-seismic bridge pier with built-in energy dissipation device according to claim 1 , wherein the part of the piston rod ( 11 ) extending out of the cylinder ( 8 ) is sleeved with a spring ( 9 ). 4 . 4. An anti-seismic bridge pier with built-in energy dissipation device according to claim 1, wherein both ends of the energy dissipation component are provided with hinged supports (10), and the hinged supports (10) are connected with The pipe pile is welded and connected with the pier (2) by bolts. 5. The anti-seismic bridge pier with built-in energy dissipation device according to claim 1, wherein the pipe pile comprises a steel pipe pile (3), and the steel pipe pile (3) is poured with foam concrete (4). 6 . The seismic bridge pier with built-in energy dissipation device according to claim 5 , wherein the center of the steel pipe pile ( 3 ) coincides with the center of the bridge pier ( 2 ). 7 . 7. An anti-seismic bridge pier with built-in energy dissipation device according to claim 1 or 5, characterized in that the bottom of the steel pipe pile (3) is cast or welded with the pier foundation (12), and the top is connected with the bridge support There is a rubber pad (6) between (1). The seismic bridge pier with built-in energy dissipation device according to claim 7, wherein the diameter of the steel pipe pile (3) is 1/3 to 2/3 of the minimum inner diameter of the bridge pier (2). 9 . The seismic bridge pier with built-in energy dissipation device according to claim 1 , wherein the bridge pier ( 2 ) is provided with a bridge support ( 1 ) at the top, and the bottom is fixed on the bridge pier foundation ( 12 ). 10 . 10. A construction method for an anti-seismic bridge pier with a built-in energy dissipation device, characterized in that it comprises the following steps: (1) Determine the minimum size D of the inner diameter of the pier, the pouring height H of the pier at all levels and the diameter d of the steel pipe pile according to the engineering needs and the bearing capacity calculation, and determine the size of the shock absorption and energy dissipation device according to the size of the gap between the pier and the steel pipe pile ; (2) During the construction of the bridge pier foundation, insert the steel pipe pile into the bridge pier foundation and pour concrete, and rigidly connect the steel pipe pile to the bridge pier foundation, and the height of the installed steel pipe pile is the same as that of the hollow pier poured in the first stage; (3) Determine the installation position of the shock absorption and energy consumption devices. The distance between the upper and lower rows of shock absorption energy consumption devices is not less than (D-d), not more than 3 (D-d), and the shock absorption energy consumption devices located at the top or bottom are respectively The distance between the top or bottom of the bridge pier is not less than (D-d), not more than 3 (D-d); (4) Construction of pier reinforcement, installation of pier formwork, and installation of hinged supports on the formwork through screws, pouring concrete into the formwork, pouring the hinged supports in concrete, and pouring foam concrete into the steel pipe pile at the same time. Weld another hinged support on the corresponding position of the steel pipe pile; (5) After the pier of this level is removed from the formwork, install the shock absorption and energy dissipation device so that the piston is located in the middle position of the cylinder in the initial position; (6) Install the next-level steel pipe pile, and repeat steps (1) to (5). After the installation of the last-level bridge pier is completed, install a rubber pad on the top of the steel pipe pile, and finally pour the bridge support.

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