CN112855828A

CN112855828A - Shock-absorbing damper of high-pile wharf

Info

Publication number: CN112855828A
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
Current assignee: Harbin Institute of Technology
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-28
Anticipated expiration: 2040-12-30
Also published as: CN112855828B

Abstract

A shock absorption damper of a high-pile wharf belongs to the technical field of port engineering shock absorption. 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. The invention reduces the damage of the earthquake to the fork piles and the upper structure of the high-pile wharf, can resist the static force mooring load, resist the loads with different sizes, and reduce the damage of the fork piles and the upper structure; the method is suitable for projects such as ports and water transportation under the action of various loads.

Description

Shock-absorbing damper of 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 anti-seismic design can be carried out on the pile foundation, and the anti-seismic 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 isolation and reduction 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 important 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 can be reduced;

2. under the action of static load of a mooring vessel, an excitation coil in the magnetorheological damper can generate a radial magnetic field along the radius of the auxiliary piston rod in a gap between the auxiliary cylinder body and the auxiliary piston rod 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 acted by the magnetic field and is converted from Newtonian fluid with good fluidity into a viscoplastic body with certain shear yield stress, so that the flow resistance of the fluid is increased, and the static mooring vessel 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 the friction between the damping medium in the cylinder body and the piston and the cylinder body, converts seismic energy into heat energy through the reciprocating motion of the damping medium of the piston to be dissipated, gradually reduces the motion speed of the piston to achieve the effect of reducing the damping, and can dissipate the seismic energy, so that the damage to the fork pile and the upper structure is reduced;

5. the limiting rubber body is fixed at the end part of the main piston rod, and under the action of a large earthquake load in a high-pile wharf without the matching of a limiting device, a damper is easy to fall off even if a damping damper is adopted, so that the upper deck structure is cracked, and the forked piles are greatly laterally moved. 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 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 vice piston rod 1 twines has excitation coil 14, and vice piston rod 1 and excitation coil 14's outside ring cover is equipped with vice cylinder body 13, be annotated with magnetic current becomes liquid 12 in the vice cylinder body 13, and the one end of vice piston rod 1 stretches out to the outside of main piston rod 3, and the outer wall of vice cylinder body 13 and the inner wall fixed connection of main piston rod 3, be equipped with frequency trigger switch 11 between main piston rod 3 and the vice piston rod 1. When the invention bears the static load of a mooring 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 the 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 relative 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 changed into a viscoplastic body with certain shear yield stress from Newtonian fluid with good fluidity under the action of a magnetic field, and the flow resistance of the magnetorheological liquid 12 is increased, so that the aim of resisting the 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 cap 4, a piston 5, a left end cap 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 connected with the right end cover 4 and the left end cover 6 in a sliding mode, a main cylinder body 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 body 8, and the right end cover 4 and the left end cover 6 are rotatably connected with the main cylinder body 8 through bearings; 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 the upper structure.

The fourth concrete implementation mode: in 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 body 8, if the stroke of the damper exceeds the designed stroke range, the limiting effect is achieved through 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 body, 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, namely the 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 poured with a first anchor block 19, 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 poured with a second anchor block 20, 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. The utility model provides a shock attenuation attenuator of high stake pier which characterized in that: comprises a magneto-rheological damper (2), a frequency trigger switch (11) and a viscous damper (24); the magnetorheological damper (2) is arranged in a main piston rod (3) of the viscous damper (24), and a frequency trigger switch (11) is arranged between the outer end of the main piston rod (3) and the magnetorheological damper (2).

2. The shock absorbing damper for a high pile wharf of claim 1, wherein: the magnetorheological damper (2) comprises an auxiliary piston rod (1), magnetorheological liquid (12), an auxiliary cylinder body (13) and an excitation coil (14); the outer wall winding of vice piston rod (1) has excitation coil (14), and the outside ring suit of vice piston rod (1) and excitation coil (14) is equipped with vice cylinder body (13), interior magnetorheological suspensions (12) of having annotated in vice cylinder body (13), the one end of vice piston rod (1) is stretched out to the outside of main piston rod (3), the outer wall of vice cylinder body (13) and the inner wall fixed connection of main piston rod (3), be equipped with frequency trigger switch (11) between main piston rod (3) and vice piston rod (1).

3. The shock-absorbing damper for a high-piled wharf as claimed in claim 1 or 2, wherein: the viscous damper (24) comprises a main piston rod (3), a right end cover (4), a piston (5), a left end cover (6), a main cylinder body (8) and a damping medium (10); main piston rod (3) level sets up and the outside is perpendicular the cover in proper order and is equipped with right-hand member lid (4), piston (5) and left end lid (6), piston (5) and main piston rod (3) fixed connection, main piston rod (3) and right-hand member lid (4) and left end lid (6) sliding connection, the outside cover of right-hand member lid (4), piston (5) and left end lid (6) is equipped with main cylinder body (8), and the inner wall laminating setting of the outer wall of piston (5) and main cylinder body (8), and right-hand member lid (4) and left end lid (6) rotate with main cylinder body (8) and are connected, be located in main cylinder body (8) and be equipped with damping medium (10) between right-hand member lid (4) and left end lid (6), the upper and lower both ends of piston (5) run through its thickness direction and are equipped with piston hole (.

4. The shock absorbing damper for a high pile wharf of claim 3, wherein: viscous damper (24) still include spacing rubber body (7), the fixed suit in the outside of main piston rod (3) of spacing rubber body (7) to the setting is at the left end of left end lid (6), and the outside of spacing rubber body (7) sets up with the inner wall laminating of main cylinder body (8).