CN112855828B

CN112855828B - A shock-absorbing damper for a high-piled wharf

Info

Publication number: CN112855828B
Application number: CN202011613481.5A
Authority: CN
Inventors: 唐亮; 司盼; 张征; 田爽; 满孝峰; 刘书幸; 邱梦瑶
Original assignee: Harbin Institute of Technology Shenzhen
Current assignee: Harbin Institute of Technology Shenzhen
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2022-07-15
Anticipated expiration: 2040-12-30
Also published as: CN112855828A

Abstract

A shock-absorbing damper for a high-piled wharf belongs to the technical field of shock-absorbing in port engineering. The magnetorheological damper is arranged in the main piston rod of the viscous damper, and a frequency trigger switch is arranged between the outer end of the main piston rod and the magnetorheological damper. The invention reduces the damage to the fork piles and the superstructure of the high-piled wharf, can resist the static mooring load, resists loads of different sizes, reduces the damage of the fork piles and the superstructure, The compression of the cover contact acts as a limit, which overcomes the defect that the traditional viscous damper has a single operating frequency and cannot effectively control different excitation frequencies; it is suitable for ports, water transportation and other projects under various loads.

Description

Shock absorption damper for high-pile wharf

Technical Field

The invention relates to a shock absorption damper of a high-pile wharf, and belongs to the technical field of port engineering shock absorption.

Background

The fork pile in the port high-pile wharf engineering has the advantages of high rigidity, high horizontal bearing capacity, low engineering cost and the like, so that the fork pile is widely applied. As harbor engineering is mostly located in earthquake frequency regions, earthquake damage examples and researches show that high-pile wharfs, particularly forked piles and upper structures can be broken, bent, twisted, laterally shifted and the like under the action of earthquakes, and great loss is brought to the whole harbor engineering and even the social development.

In order to reduce the damage of the pile foundation, on one hand, the earthquake-proof design can be carried out on the pile foundation, and the earthquake-proof performance is improved; on the other hand, the seismic isolation and reduction technology can also be applied to pile foundation engineering. At present, seismic isolation and reduction measures based on a ductile seismic design theory are fully researched in bridge and house building design, and the adoption of a seismic isolation or energy consumption damper device can effectively improve the overall seismic performance of engineering and reduce seismic damage.

However, these seismic mitigation and isolation techniques have not found widespread use in high-piled wharfs. The mainstream high-pile wharf regulations at home and abroad do not relate to the requirements of concrete seismic isolation and reduction measures. Therefore, the development of seismic isolation measures has great significance for improving the seismic performance in the high-pile wharf.

Disclosure of Invention

In order to solve the problems in the background art, the invention provides a shock absorption damper for a high-pile wharf.

The invention adopts the following technical scheme: a shock absorption damper of a high-pile wharf comprises a magneto-rheological damper, a frequency trigger switch and a viscous damper; the magnetorheological damper is arranged in a main piston rod of the viscous damper, and a frequency trigger switch is arranged between the outer end of the main piston rod and the magnetorheological damper.

Compared with the prior art, the invention has the beneficial effects that:

1. the magnetorheological damper and the viscous damper are combined and applied to the high-pile wharf, so that the earthquake force can be effectively isolated, and the damage of the earthquake to the fork piles and the upper structure of the high-pile wharf is reduced;

2. under the action of static load of a berthing ship, a radial magnetic field along the radius of an auxiliary piston rod can be generated in a gap between an auxiliary cylinder body and the auxiliary piston rod by an excitation coil in a magnetorheological damper under the action of current, when the auxiliary piston rod moves relative to the auxiliary cylinder body and extrudes magnetorheological liquid to force the magnetorheological liquid to flow through the gap between the auxiliary cylinder body and the auxiliary piston rod, the magnetorheological liquid can be under the action of the magnetic field, Newtonian fluid with good fluidity can be converted into a viscoplastomer with certain shearing yield stress, so that the flow resistance of the fluid is increased, and the static berthing ship load is resisted;

3. the invention relates to a magneto-rheological damper, belonging to a semi-active control device, which adjusts input current according to the static load of a berth ship to trigger magnetic fields with different strengths so as to generate different damping forces. When the magnetorheological damper is subjected to a huge earthquake load, the frequency trigger switch positioned between the magnetorheological damper and the piston rod is started, the main damper starts to work, and different dampers are activated through the frequency trigger switch to resist loads with different sizes;

4. the viscous damper generates damping force through friction between the damping medium in the cylinder body and the piston and the cylinder body, converts seismic kinetic energy into heat energy through reciprocating motion of the damping medium of the piston to be dissipated, enables the motion speed of the piston to be gradually reduced to achieve the effect of reducing damping, and can dissipate seismic energy, so that damage to a fork pile and an upper structure is relieved;

5. the limiting rubber body is fixed at the end part of the main piston rod, and in a high-pile wharf without a limiting device, under the action of a huge earthquake load, even if a shock absorption damper is adopted, the damper is easy to fall off, so that an upper deck structure is cracked, and the forked piles are shifted to a huge side. The damper with the limiting device is additionally arranged, so that deformation is effectively controlled and protected; when the stroke of the damper exceeds the stroke range, the limit effect is achieved through the compression of the limit rubber body in contact with the end cover of the main cylinder body;

6. the invention has simple structure, convenient installation, low energy consumption, high energy consumption efficiency, continuous and reversible change under the action of pseudo-static load, strong energy consumption capability under earthquake load and limit function; the main piston rod and the auxiliary piston rod work cooperatively to adapt to environments with different vibration excitation frequencies, so that the defect that the traditional viscous damper is single in working frequency and cannot effectively control different excitation frequencies is overcome; the method is suitable for projects such as ports and water transportation under the action of various loads.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a magnetorheological damper;

FIG. 3 is a schematic view of a viscous damper;

fig. 4 is a schematic view of the installation of the present invention.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.

The first embodiment is as follows: as shown in fig. 1 to 4, the invention discloses a shock absorption damper of a high-pile wharf, which comprises a magnetorheological damper 2, a frequency trigger switch 11 and a viscous damper 24; the magneto-rheological damper 2 is arranged in a main piston rod 3 of a viscous damper 24, and a frequency trigger switch 11 is arranged between the outer end part of the main piston rod 3 and the magneto-rheological damper 2. When the invention bears a huge earthquake load, the high-frequency earthquake wave can excite the frequency trigger switch 11 to enable the magnetorheological damper 2 to quit working, the viscous damper 24 starts working, further the earthquake energy is consumed, and the aim of shock absorption is achieved.

The second embodiment is as follows: the embodiment is further explained for the first embodiment, the magnetorheological damper 2 comprises an auxiliary piston rod 1, a magnetorheological fluid 12, an auxiliary cylinder body 13 and an excitation coil 14; the preferred middle part of the outer wall of the auxiliary piston rod 1 is twined with excitation coil 14, and the outer side ring cover of the auxiliary piston rod 1 and excitation coil 14 is equipped with auxiliary cylinder body 13, the interior magnetorheological fluid 12 that is annotated of auxiliary cylinder body 13, and one end of auxiliary piston rod 1 stretches out to the outside of main piston rod 3, and the outer wall of auxiliary cylinder body 13 is fixed connection with the inner wall of main piston rod 3, be equipped with frequency trigger switch 11 between main piston rod 3 and the auxiliary piston rod 1. When the magnetorheological damper bears a static load of a berth ship, the magnet exciting coil 14 in the magnetorheological damper 2 can generate a radial magnetic field along the radius of the auxiliary piston rod 1 in a gap between the auxiliary cylinder body 13 and the auxiliary piston rod 1 under the action of current; when the auxiliary piston rod 1 moves relatively to the auxiliary cylinder body 13, the magnetorheological liquid 12 is extruded to force the magnetorheological liquid to flow through a gap between the auxiliary cylinder body 13 and the auxiliary piston rod 1, the magnetorheological liquid 12 is under the action of a magnetic field, Newtonian fluid with good fluidity is converted into a viscoplastomer with certain shear yield stress, the flow resistance of the magnetorheological liquid 12 is increased, and the aim of resisting static mooring load is fulfilled.

The third concrete implementation mode: in this embodiment, the first or second embodiment is further described, and the viscous damper 24 includes a main piston rod 3, a right end cover 4, a piston 5, a left end cover 6, a main cylinder 8, and a damping medium 10; the damping device is characterized in that the main piston rod 3 is horizontally arranged, a right end cover 4, a piston 5 and a left end cover 6 are sequentially and vertically sleeved on the outer side of the main piston rod 3, the piston 5 is fixedly connected with the main piston rod 3, the main piston rod 3 is slidably connected with the right end cover 4 and the left end cover 6, a main cylinder 8 is sleeved on the outer sides of the right end cover 4, the piston 5 and the left end cover 6, the outer wall of the piston 5 is attached to the inner wall of the main cylinder 8, and the right end cover 4 and the left end cover 6 are rotatably connected with the main cylinder 8 through bearings so as to achieve the purpose of replacing the damping medium 10; a damping medium 10 is arranged between the right end cover 4 and the left end cover 6 in the main cylinder body 8, the upper end and the lower end of the piston 5 are provided with piston holes 9 in the thickness direction, and the piston holes 9 allow the damping medium 10 to flow through; when the whole structure bears huge earthquake load, the frequency trigger switch 11 can be excited by the action of high-frequency earthquake waves, so that the magnetorheological damper 2 is withdrawn from working, and the viscous damper 24 starts to work. When the viscous damper 24 works, the main piston rod 3 reciprocates, so that huge damping force is generated among damping medium 10 molecules, between the damping medium 10 and the main cylinder body 8 and when the damping medium 10 passes through the piston hole 9, and the flowing damping force converts seismic energy into heat to be dissipated, thereby lightening the damage of the fork pile and an upper structure.

The fourth concrete implementation mode is as follows: the third embodiment is further described with respect to the third embodiment, the viscous damper 24 further includes a limiting rubber body 7, the limiting rubber body 7 is fixedly sleeved outside the main piston rod 3 and is arranged at the left end of the left end cover 6, the outer part of the limiting rubber body 7 is attached to the inner wall of the main cylinder 8, if the stroke of the damper exceeds the designed stroke range, the limiting effect is achieved by the compression of the rubber body, and when the main piston rod 3 moves leftwards until the rubber body 7 contacts with the left side wall 23 of the main cylinder, the rubber body 7 compresses and generates resistance; when the main piston rod 3 moves rightwards to the state that the rubber body 7 is in contact with the left end cover 6, the rubber body 7 is compressed and generates resistance, and therefore the purpose of limiting is achieved.

The invention provides a shock absorption damper which is applied between a fork pile and a deck of a high-pile wharf, can bear static force mooring load, can consume seismic energy and has a horizontal limiting function.

The invention relates to a damping damper between a fork pile and a deck of a high-pile wharf in port engineering.

The shock absorption damper of the high-pile wharf is characterized in that a frequency control two-stage damper 17 is horizontally arranged between a pile cap 16 and a deck 15, one end of the frequency control two-stage damper 17 is provided with a first anchor block 19 in a pouring mode, the first anchor block 19 is anchored with the pile cap 16 through a first bolt 18, the other end of the frequency control two-stage damper 17 is provided with a second anchor block 20 in a pouring mode, and the second anchor block 20 is anchored with the deck 15 through a second bolt 21. The pile cap 16 is poured on top of the fork pile 22.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A shock-absorbing damper for a high-piled wharf, characterized in that: comprising a magnetorheological damper (2), a frequency trigger switch (11) and a viscous damper (24); the magnetorheological damper ( 2) It is arranged in the main piston rod (3) of the viscous damper (24), and a frequency trigger switch ( 11).

2. The shock-absorbing damper of a high-piled wharf according to claim 1, wherein the magnetorheological damper (2) comprises a secondary piston rod (1), a magnetorheological liquid (12), Auxiliary cylinder (13) and excitation coil (14); an excitation coil (14) is wound around the outer wall of the auxiliary piston rod (1), and an auxiliary cylinder is sleeved on the outer ring of the auxiliary piston rod (1) and the excitation coil (14) The auxiliary cylinder (13) is filled with magnetorheological fluid (12), one end of the auxiliary piston rod (1) protrudes to the outside of the main piston rod (3), and the auxiliary cylinder (13) The outer wall of the main piston rod (3) is fixedly connected with the inner wall of the main piston rod (3), and a frequency trigger switch (11) is arranged between the main piston rod (3) and the auxiliary piston rod (1).

3. The shock-absorbing damper for a high-piled wharf according to claim 1 or 2, wherein the viscous damper (24) comprises a main piston rod (3), a right end cover (4), a piston (5), the left end cover (6), the main cylinder (8) and the damping medium (10); the main piston rod (3) is arranged horizontally and the outer side is vertically sleeved with the right end cover (4), the piston (5) and the The left end cover (6), the piston (5) is fixedly connected with the main piston rod (3), the main piston rod (3) is slidably connected with the right end cover (4) and the left end cover (6), the right end cover (4) , the outer side of the piston (5) and the left end cover (6) is sheathed with a main cylinder (8), and the outer wall of the piston (5) is fitted with the inner wall of the main cylinder (8), the right end cover (4) and the left end cover (6) It is rotatably connected to the main cylinder (8), and the main cylinder (8) is provided with a damping medium (10) between the right end cover (4) and the left end cover (6), and the upper and lower parts of the piston (5) Piston holes (9) are provided at both ends through its thickness direction.

The shock-absorbing damper for a high-piled wharf according to claim 3, wherein the viscous damper (24) further comprises a limit rubber body (7), and the limit rubber body ( 7) The fixed sleeve is fitted on the outer side of the main piston rod (3), and is arranged on the left end of the left end cover (6), and the outside of the limiting rubber body (7) is fitted with the inner wall of the main cylinder (8).