CN111549665A - Fire-resistant built-in damping stay cable - Google Patents
Fire-resistant built-in damping stay cable Download PDFInfo
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- CN111549665A CN111549665A CN202010263367.8A CN202010263367A CN111549665A CN 111549665 A CN111549665 A CN 111549665A CN 202010263367 A CN202010263367 A CN 202010263367A CN 111549665 A CN111549665 A CN 111549665A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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Abstract
The invention relates to a fire-resistant built-in damping stay cable, wherein a cable body (4) of the stay cable comprises a steel wire bundle, a heat insulation rope, a wrapping belt, an inner layer sheath and an outer layer sheath which are arranged from inside to outside, the heat insulation rope and the steel wire bundle are arranged in a through manner, and a plurality of heat insulation ropes surround the periphery of the steel wire bundle to form annular isolation on the steel wire bundle; the stay cable is anchored on a pre-buried pipe (1), an extension cylinder (2) is arranged at the end part of the pre-buried pipe (1), a damper (3) is arranged inside the extension cylinder (2), a cable body (4) is embraced by the damper (3), a beam end sealing waterproof cap (5) is arranged at the other end of the extension cylinder (2), and the beam end sealing waterproof cap (5) positioned at the uppermost end forms sealing waterproof for the surface of the cable body (4). The integration of fire resistance and built-in high damping is realized, and the product can be produced in batch as a customized standard product.
Description
Technical Field
The invention relates to a fire-resistant stay cable structure and a damping vibration attenuation structure of a stay cable.
Background
The main stressed member of the cable-stayed bridge is a stay cable, and the working condition of the stay cable has the most direct and important influence on the structural safety, the running state and the service life of the cable-stayed bridge. First, the stay cable is inevitably affected by various adverse factors such as corrosion degradation, performance attenuation, vibration fatigue, and the like in a natural environment. The stay cable is very sensitive to corrosion because the stay cable is arranged outside the beam body and is in a high-stress state for a long time, and the service safety and the durability of the stay cable bridge depend on the corrosion resistance of the stay cable to a great extent.
And a rubber damper is arranged in the stay cable embedded pipe, and the deformation hysteresis damping energy consumption of the high-damping rubber is utilized. Elastic materials, while capable of storing energy, do not dissipate energy; in contrast, viscous liquids have the ability to dissipate energy, but are not capable of storing energy, so only viscoelastic materials between viscous liquids and elastic solids can have both the role of standing stored energy and dissipating energy. When the deformation is generated under the action of alternating stress, part of energy is stored, the other part of energy is dissipated and converted into heat energy, and the loss or conversion of the energy is represented as mechanical damping and has the function of vibration damping, so that the effect of vibration reduction is achieved. High damping rubber (hereinafter sometimes also simply referred to as rubber) is a viscoelastic material that has both certain viscous liquid and elastic solid properties. In addition, the damping effect of the rubber damper is directly related to the sectional area and thickness of the rubber. The traditional rubber damper is directly installed at the pipe orifice of the embedded pipe, and because the embedded pipe and the stay cable have inevitable eccentricity, an eccentric adjusting mechanism must be arranged for rubber, as shown in figures 1 and 2, and the eccentric adjusting mechanism usually occupies installation space, so that the rubber thickness and area of the damper are inhibited, and the damping effect of the rubber damper is seriously influenced.
In addition, with the high-speed development of bridge construction and the increasing of in-service bridges, various bridge fire accidents frequently occur, and according to statistics of bridge fire explosion accident occurrence data in the world, the number of bridges collapsed due to fire is about 2.7 times of that collapsed due to earthquake every year. In a fire accident of the cable-stayed bridge, due to the fact that an HDPE outer sheath pipe is burnt in field operation to cause a fire disaster of a stay cable, a stress component of a main body of the stay cable is damaged, and a bridge floor on one side of a cable breaking position is seriously sunk, so that huge economic loss and social adverse effects are caused. Therefore, fire protection or fire resistance is a major safety problem to be solved by the stay cable, the fire protection is mainly aimed at reducing the spread of fire to the stay cable, and the fire resistance is aimed at protecting the stay cable from the collapse of the bridge in the event of fire.
At present, most of the stay cables do not have the performance necessary for simultaneously solving the problems, and the conventional method still foresees the problems in the service period of the stay cables and then takes remedial measures, such as reinforcing or replacing external dampers of the stay cables or winding fireproof materials and the like, and the remedial measures have the problems of multiple interfaces, poor matching, poor durability and the like.
Disclosure of Invention
The invention aims to provide a stay cable integrating fire resistance and built-in damping, so that a stay cable body has fire resistance and a better damping and anti-vibration effect.
The technical scheme of the invention is as follows: a fire-resistant built-in damping stay cable is characterized in that a cable body of the stay cable comprises a steel wire bundle, a heat insulation rope, a wrapping belt, an inner layer sheath and an outer layer sheath which are arranged from inside to outside, wherein the heat insulation rope and the steel wire bundle are arranged in a through-length mode, and a plurality of heat insulation ropes surround the periphery of the steel wire bundle to form annular isolation on the steel wire bundle; the utility model discloses a cable body, including the stay cable, the stay cable anchor is in buried pipe in advance, buried pipe tip sets up extends a section of thick bamboo, extend the inside attenuator that sets up of a section of thick bamboo, the attenuator is embraced the cable body, extend a section of thick bamboo other end and set up the sealed waterproof cap of beam-ends again, be located the top the sealed waterproof cap of beam-ends constitutes sealed waterproof to cable body surface.
Preferably, a tapered cylinder is arranged at the bottom of the beam-end sealing waterproof cap, the tapered cylinder is screwed with the extension cylinder through internal and external threads, and the structure of the beam-end sealing waterproof cap refers to a patent document with a publication number of CN110453589A, and belongs to an observable sealing waterproof cap.
Preferably, the thermal insulation rope is a ceramic fiber thermal insulation rope.
Preferably, the embedded pipe and the extension cylinder are in flange butt joint, strip-shaped holes are respectively formed in the flange plates of the embedded pipe and the extension cylinder, and the strip-shaped holes of the two flange plates are in one-to-one correspondence and are fixed through locking parts. Furthermore, one of the two flange plates butted by the embedded pipe and the extension cylinder adopts a strip-shaped hole extending in the radial direction, the other flange plate adopts a strip-shaped hole extending in the tangential direction, and the strip-shaped hole extending in the radial direction and the strip-shaped hole extending in the tangential direction are correspondingly locked, so that centering adjustment is realized.
Preferably, set up the angle muscle between the ring flange of pre-buried pipe and the pre-buried pipe body, set up the angle muscle between the ring flange of an extension section of thick bamboo and the extension section of thick bamboo barrel, the angle muscle improves intensity as the structure.
Preferably, the extension section of thick bamboo is the orange-peel composite structure, forms by the concatenation of the arc spare more than two, and convenient equipment, the limit of each arc spare sets up the connection limit, and the edge on adjacent two arc limits is connected fixedly through connecting the limit.
Preferably, the damper is matched with the extension cylinder in shape and size, the damper is of a two-flap opposite-combination structure and embraces the cable body, and the extension cylinder embraces the damper.
Preferably, the peripheral surface of the damper is of an axial corrugated structure, so that vibration is better absorbed and consumed.
The damper is of a cylinder-like structure, and the design steps of the sectional area A and the axial thickness t are as follows:
(1) collecting known parameters: the type of the stay cable, the length of the stay cable, the angle of the stay cable, the unit length mass cable force of the stay cable, the installation height of the damper and the performance parameters of the damping material used by the damper;
(2) determining the installation height of the damper according to the length of the embedded pipe and the length of the extension cylinder;
(3) determining a vibration damping target: cause the reason of cable-stay bridge cable body vibration a lot of, the structural damping of cable body itself is very little, and its logarithmic decrement rate is 0.002 ~ 0.008 generally, because structural damping is crucial to aerodynamic stability, so cable body itself belongs to a structure that is difficult to stabilize: if the stay cable is composed of parallel cables arranged side by side, in order to prevent the occurrence of wake flow galloping, the logarithmic decrement of the cables is required to be more than 0.05; if the cables are not arranged side by side, the low-order logarithmic attenuation rate of the cables should reach 0.02-0.03 to resist wind and rain vibration of the cables, and the high-order logarithmic attenuation rate should reach 0.010-0.015 to resist vortex excitation;
(4) determining the optimal elastic rigidity value K of the damper required by the damper to achieve the vibration damping targetopt，
Wherein r is the internal friction coefficient of the damper, is the self-characteristic of the damping material, and is obtained by the collection in the step (1);
ωnthe vibration frequency of the stay cable is n order and is related to the length, tension and unit mass of the stay cable;
v is damping material composite rigidity factor, v is 4r2/(4+r2)；
In the formula: t is the tension of the stay cable;
l is the length of the stay cable;
x is the linear distance from the damper mounting position to the anchoring end;
ωnthe vibration frequency of the stay cable is n order;
(5) calculating the sectional area A and the axial thickness t of the damper by applying a formula K which is GA/t;
wherein: g is the elastic modulus of the damping material;
a is the cross-sectional area of the damper;
t is the axial thickness of the damper.
Compared with the prior art, the invention has the advantages that:
(1) the fire-resistant built-in damping stay cable realizes the protection of the stay cable through the ceramic fiber heat insulation rope after a fire disaster occurs, protects the core component, namely the steel wire bundle, of a cable body, reduces the influence of the fire disaster on the bearing capacity of the cable body, and guarantees the safety of the whole structure of a bridge.
(2) By adopting the observable waterproof cap structure, the anchoring end of the stay cable is effectively waterproof and has the functions of being observable and repairable, and the anti-corrosion capability of the anchor head of the stay cable is improved.
(3) The stay cable system adopts the built-in damper, the damper is arranged in the extension cylinder, the internal space of the extension cylinder is fully utilized to fix the damper, the damper is designed according to the service condition of the stay cable, and wind and rain vibration and vortex excitation resistance are considered at the same time, so that the vibration reduction precision is realized.
The integration of high performance, fire resistance and built-in high damping is realized, and the product can be produced in batch at one time as a customized standard product.
Drawings
FIG. 1 is a schematic structural view of a conventional rubber damper;
FIG. 2 is a schematic structural view of a conventional metal-rubber hybrid damper;
FIG. 3 is a partial structural view of a pre-buried end of a stay cable in the embodiment of the present invention;
FIG. 4 is a schematic diagram of an external shape of a pre-buried end of a stay cable according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a cable body according to an embodiment of the present invention;
FIG. 6 is a schematic perspective view of a cable according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of a buried pipe according to an embodiment of the present invention;
FIG. 8 is a schematic structural view of an extension cylinder in an embodiment of the present invention;
FIG. 9 is a schematic structural view of a damper according to an embodiment of the present invention;
FIG. 10 is a schematic perspective view of a damper according to an embodiment of the present invention;
FIG. 11 is a view showing an installation structure of a damper according to an embodiment of the present invention;
in the figure, 1 a pre-buried pipe, 2 an extension cylinder, 3 a damper, 4 cable bodies, 5 a beam end sealing waterproof cap, 6 a conical cylinder, 7 angle ribs, 8 strip-shaped holes, 9 steel wire bundles, 10 ceramic fiber fireproof heat insulation ropes, 11 polyester wrapping belts, 12 inner-layer high-density polyethylene sheaths, 13 outer-layer high-density polyethylene sheaths, 14 screws, 15 damping rings, 16 metal rings and 17 wedge blocks.
Detailed Description
The present invention will be described in further detail below with reference to the embodiments of the drawings, which are illustrative and intended to be illustrative of the present invention and are not to be construed as limiting the present invention.
High performance, fire-resistant type, built-in high damping integration stay cable system need go to the dish design of considering each component in the design stage to guarantee damping, waterproof and fire-resistant function of the whole system of stay cable, specifically as follows:
1) the design of the embedded pipe must consider the flange edge design of the pipe orifice at the beam end, the welding and the manufacturing of the embedded flange are completed during the manufacturing period of a factory, and the operations of welding, cutting and the like on site are avoided.
2) The design of the stay cable must consider the inner fireproof structure, the filling of the fireproof structure is completed in a stay cable manufacturing factory, and the operation on site is not needed
3) According to the length of the stay cable and the length of the embedded pipe, the parameters of the built-in all-rubber damper are designed, the technical parameters of the extension cylinder are determined, and the built-in all-rubber high damper and the matched extension cylinder are customized in a factory.
The stay cable of the embodiment is characterized in that a cable body is provided with a fireproof structure, and the cable body sequentially comprises a high-strength zinc-aluminum alloy coating steel wire bundle 9 (hereinafter referred to as a steel wire bundle), a ceramic fiber fireproof heat insulation rope 10, a high-strength polyester wrapping belt 11, an inner-layer high-density polyethylene sheath 12 (black) and an outer-layer high-density polyethylene sheath 13 (colored) from inside to outside, wherein the ceramic fiber fireproof heat insulation rope 10 and the steel wire bundle 9 are arranged in a continuous length manner, and a plurality of strands of ceramic fiber fireproof heat insulation ropes surround the periphery of the steel wire bundle 9 without gaps, and form gapless isolation on the steel wire bundle 9, as shown in fig. 5-6.
Wherein the high-strength zinc-aluminum alloy coating steel wire bundle is a basic bearing component of the stay cable.
The ceramic fiber fireproof heat insulation rope (hereinafter referred to as ceramic fiber rope) is a fireproof heat insulation component of the stay cable steel wire bundle. The main materials of the ceramic fiber rope are alumina, silicon oxide and other materials, and the ceramic fiber rope is a fibrous light refractory material and has the characteristics of light weight, high temperature resistance, good thermal stability, low thermal conductivity, small specific heat, mechanical vibration resistance and the like. When a fire disaster occurs on site, when the high-density polyethylene is heated or burnt, the ceramic fiber rope can play a good role in insulating temperature, and the situation that the stay cable is ineffective in bearing caused by overhigh temperature of the steel wire bundle is prevented. In addition, under a large fire, the aluminum oxide of the ceramic fiber rope can form a ceramic shell to cover the material to isolate the combustible gas, so that the flame retardant effect is further achieved, the ceramic shell formed by combustion is not melted and cannot fall off from the cable body during high-temperature combustion, and the ceramic shell formed in the combustion process is a honeycomb ceramic shell with fine pores, so that the ceramic shell has good effects of fire insulation, heat insulation and combustible gas isolation. The purposes of protecting the bearing function of the stay cable from losing and ensuring the safety of the related structure of the bridge within a period of time when a fire occurs are achieved.
The (high-strength) polyester fiber belt 11 is a molding and shaping component of a steel wire bundle and a fireproof heat insulation structure. The inner layer and the outer layer of high-density polyethylene sheaths (12, 13) have stronger fireproof and ageing resistance, are protective structures of the stay cable body steel wire bundle and a fireproof heat insulation structure, and prevent the corrosion of the steel wire bundle and the ageing of a fireproof heat insulation rope.
The fire-resistant cable body structure is manufactured in a factory, anchorage devices are installed at two ends of the fire-resistant cable body structure, and anchor filling is completed to form the fire-resistant stay cable. In the manufacturing process of the fire-resistant type, the steel wire is fed, the fire-resistant rope is filled in the twisting process, the polyester wrapping belt is wound for shaping, and the double-layer high-density polyethylene sheath is hot extruded. Due to the filling of the fire-resistant rope, the twisted hexagon or the definite angle hexagon is changed into the round shape, the problem that the cross section of the existing inclined stay cable is out of round after extrusion molding is solved, the sealing degree of the inclined stay cable and the sealing component can be improved, the sealing performance of the observable sealing cover of the inclined stay cable can be further improved, and the sealing and the water proofing of an inclined stay cable system are facilitated.
The cable body anchor of suspension cable is in buried pipe 1 in advance, and 1 top of buried pipe sets up and extends a section of thick bamboo 2, extends the inside attenuator 3 that sets up of a section of thick bamboo 2, and the attenuator 3 embraces cable body 4, extends 2 tops of a section of thick bamboo and sets up roof beam end waterproof seal cap 5 again, lies in to constitute between the roof beam end waterproof seal cap 5 of the top and the cable body 4 waterproof seal, constitutes waterproof seal to the structure within extending a section of thick bamboo 2 and buried pipe 1.
Further, the butt joint of a pre-buried pipe 1 and 2 flanges of an extension section of thick bamboo, be provided with bar hole 8 on the ring flange of a pre-buried pipe 1 and an extension section of thick bamboo 2 respectively, the ring flange of an extension section of thick bamboo 2 adopts radial extension's bar hole 8, pre-buried pipe 1 adopts tangential extension's bar hole 8, a radial extension's bar hole and a tangential extension's bar hole correspond from top to bottom, and lock through screw and nut, thereby realize the centering adjustment of a pre-buried pipe 1 and an extension section of thick bamboo 2, adopt range estimation and slide caliper precision measurement to guarantee the concentricity of suspension cable and an extension section of thick bamboo in the accommodation process. The upper end of the extension cylinder 2 is provided with a conical cylinder 6, the conical cylinder 6 is sleeved on the excircle of the extension cylinder, the conical cylinder and the extension cylinder are in threaded connection, and the small end of the extension cylinder is sleeved on the cable body 4. The conical cylinder 6 is of a Harvard type and is welded on site. And then, set up angle rib 7 between ring flange and the pre-buried pipe body, set up angle rib 7 between the ring flange of an extension section of thick bamboo and the extension section of thick bamboo barrel. As shown in fig. 8, the extension tube has a two-piece structure, and is formed by splicing two semicircles, so that the extension tube is convenient to assemble.
The damper 3 in this embodiment is similar to a cylinder in shape and size, and has a fitting structure to hold the cable body 4, and the two parts of the damper 3 are not provided with a connecting structure, but are fixed by the external extension cylinder 2 to hold the damper 3. As shown in fig. 9 and 10, the circumferential surface of the damper 3 has an axially corrugated structure.
The extension cylinder 2 and the embedded pipe 1 are adjusted through waist-shaped holes, the flange is arranged on the outer edge of the extension cylinder 2, the space inside the extension cylinder is not occupied, the stay cable and the extension cylinder 2 are concentric, and the damper 3 is installed in the extension cylinder 2. The damper 3 does not need to be provided with an eccentric adjusting device, the area and the thickness of the damper 3 are greatly improved, and the damping effect of the built-in damper is improved. In addition, through the measures, the installation position of the damper 3 is also improved, the damper 3 is arranged in the extension cylinder 2, the internal space of the extension cylinder 2 is fully utilized, and the problem of low performance of the built-in rubber damper caused by eccentricity and low installation position of the pre-embedded pipe 1 and the stay cable in the prior art is solved.
After the stay cable structure is adopted, the design of the built-in damper can be carried out by adopting the following procedures, in the embodiment, the high-performance all-rubber damper is adopted, and the design steps of the sectional area A and the axial thickness t are as follows:
(1) collecting known parameters: the type of the stay cable, the length of the stay cable, the angle of the stay cable, the unit length mass cable force of the stay cable, the installation height of the damper and the performance parameters of the damping material used by the damper;
(2) determining the installation height of the damper according to the length of the embedded pipe and the length of the extension cylinder;
(3) determining a vibration damping target: cause the reason of cable-stay bridge cable body vibration a lot of, the structural damping of cable body itself is very little, and its logarithmic decrement rate is 0.002 ~ 0.008 generally, because structural damping is crucial to aerodynamic stability, so cable body itself belongs to a structure that is difficult to stabilize: if the stay cable is composed of parallel cables arranged side by side, in order to prevent the occurrence of wake flow galloping, the logarithmic decrement of the cables is required to be more than 0.05; if the cables are not arranged side by side, the low-order logarithmic attenuation rate of the cables should reach 0.02-0.03 to resist wind and rain vibration of the cables, and the high-order logarithmic attenuation rate should reach 0.010-0.015 to resist vortex excitation;
(4) determining the optimal elastic rigidity value K of the damper required by the damper to achieve the vibration damping targetopt，
Wherein r is the internal friction coefficient of the damper, is the self-characteristic of the damping material, and is obtained by the collection in the step (1);
ωnthe vibration frequency of the stay cable is n order and is related to the length, tension and unit mass of the stay cable;
v is damping material composite rigidity factor, v is 4r2/(4+r2)；
In the formula: t is the tension of the stay cable;
l is the length of the stay cable;
x is the linear distance from the damper mounting position to the anchoring end;
ωnthe vibration frequency of the stay cable is n order;
(5) calculating the sectional area A and the axial thickness t of the damper by applying a formula K which is GA/t;
wherein: g is the elastic modulus of the damping material;
a is the cross-sectional area of the damper;
t is the axial thickness of the damper.
The high-damping rubber damper in the extension cylinder has the following characteristics:
(1) according to the result of the damping calculation, the thickness t and the sectional area A of the high-damping rubber are set, so that the material performance of the high-damping rubber is fully exerted, and the damping effect of the built-in damper is accurate.
(2) The annular shape can control the vibration of the inhaul cable in all directions (in-plane and out-of-plane), and the size of the inhaul cable can be determined according to different characteristics of the inhaul cable so as to obtain the optimal logarithmic attenuation rate;
(3) the damper has a simple appearance, can be hidden in the extension cylinder, and cannot influence the attractiveness (built-in type) of the bridge; simple structure and easy installation.
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A fire-resistant built-in damping stay cable is characterized in that: the cable body (4) of the stay cable comprises a steel wire bundle, a heat insulation rope, a wrapping belt, an inner sheath and an outer sheath which are arranged from inside to outside, the heat insulation rope and the steel wire bundle are arranged in a full-length mode, and a plurality of heat insulation ropes surround the periphery of the steel wire bundle to form annular isolation on the steel wire bundle; the stay cable is anchored on a pre-buried pipe (1), an extension cylinder (2) is arranged at the end part of the pre-buried pipe (1), a damper (3) is arranged in the extension cylinder (2), the cable body (4) is embraced by the damper (3), a beam end sealing waterproof cap (5) is further arranged at the other end of the extension cylinder (2), and the beam end sealing waterproof cap (5) positioned at the uppermost end forms sealing waterproof for the surface of the cable body (4); the damper is of a cylinder-like structure, and the design steps of the sectional area A and the axial thickness t are as follows:
(1) collecting known parameters: the type of the stay cable, the length of the stay cable, the angle of the stay cable, the unit length mass cable force of the stay cable, the installation height of the damper and the performance parameters of the damping material used by the damper;
(2) determining the installation height of the damper according to the length of the embedded pipe and the length of the extension cylinder;
(3) determining a vibration damping target: cause the reason of cable-stay bridge cable body vibration a lot of, the structural damping of cable body itself is very little, and its logarithmic decrement rate is 0.002 ~ 0.008 generally, because structural damping is crucial to aerodynamic stability, so cable body itself belongs to a structure that is difficult to stabilize: if the stay cable is composed of parallel cables arranged side by side, in order to prevent the occurrence of wake flow galloping, the logarithmic decrement of the cables is required to be more than 0.05; if the cables are not arranged side by side, the low-order logarithmic attenuation rate of the cables should reach 0.02-0.03 to resist wind and rain vibration of the cables, and the high-order logarithmic attenuation rate should reach 0.010-0.015 to resist vortex excitation;
(4) determining the optimal elastic rigidity value K of the damper required by the damper to achieve the vibration damping targetopt，
Wherein r is the internal friction coefficient of the damper, is the self-characteristic of the damping material, and is obtained by the collection in the step (1);
ωnthe vibration frequency of the stay cable is n order and is related to the length, tension and unit mass of the stay cable;
v is damping material composite rigidity factor, v is 4r2/(4+r2)；
In the formula: t is the tension of the stay cable;
l is the length of the stay cable;
x is the linear distance from the damper mounting position to the anchoring end;
ωnthe vibration frequency of the stay cable is n order;
(5) calculating the sectional area A and the axial thickness t of the damper by applying a formula K which is GA/t;
wherein: g is the elastic modulus of the damping material;
a is the cross-sectional area of the damper;
t is the axial thickness of the damper.
2. The fire-resistant built-in damping stay cable of claim 1, characterized in that: the embedded pipe and the extension cylinder are in flange butt joint, strip-shaped holes are formed in the flange plates of the embedded pipe and the extension cylinder respectively, and the strip-shaped holes of the two flange plates are in one-to-one correspondence and are fixed through locking parts.
3. The fire-resistant built-in damping stay cable of claim 2, characterized in that: one of the two flange plates butted by the embedded pipe and the extension cylinder adopts a strip-shaped hole extending in the radial direction, the other flange plate adopts a strip-shaped hole extending in the tangential direction, and the strip-shaped hole extending in the radial direction and the strip-shaped hole extending in the tangential direction are correspondingly locked, so that the centering adjustment is realized.
4. The fire-resistant built-in damping stay cable of claim 2, characterized in that: an angle rib is arranged between the flange plate of the embedded pipe and the embedded pipe body, and an angle rib is arranged between the flange plate of the extension cylinder and the cylinder body of the extension cylinder.
5. The fire-resistant built-in damping stay cable of claim 1, characterized in that: the extension cylinder is of a multi-petal combined structure and is formed by splicing more than two arc-shaped pieces.
6. The fire-resistant built-in damping stay cable of claim 1, characterized in that: the damper is matched with the extension cylinder in shape and size, the damper is of a two-flap opposite-combination type structure and embraces the cable body, and the extension cylinder embraces the damper.
7. The fire-resistant built-in damping stay cable of claim 1, characterized in that: the heat insulation rope is a ceramic fiber heat insulation rope.
8. The fire-resistant built-in damping stay cable of claim 1, characterized in that: the peripheral surface of the damper is of an axial corrugated structure.
9. The fire-resistant built-in damping stay cable of claim 1, characterized in that: the bottom of the beam-end sealing waterproof cap (5) is provided with a conical cylinder (6), and the conical cylinder (6) is screwed with the extension cylinder (2) through internal and external threads.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113914213A (en) * | 2021-10-13 | 2022-01-11 | 江阴市斯瑞特石油机械制造有限公司 | Filling protective pipe for protecting overhead guardrail |
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