CN114908995A - Ancient building supports warp damping structure - Google Patents
Ancient building supports warp damping structure Download PDFInfo
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- CN114908995A CN114908995A CN202210632363.1A CN202210632363A CN114908995A CN 114908995 A CN114908995 A CN 114908995A CN 202210632363 A CN202210632363 A CN 202210632363A CN 114908995 A CN114908995 A CN 114908995A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/04—Propping of endangered or damaged buildings or building parts, e.g. with respect to air-raid action
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/14—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate against other dangerous influences, e.g. tornadoes, floods
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- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention relates to the technical field of historic building protection, in particular to a historic building supporting deformation damping structure which comprises a support, a rigid cross rod and a damping device, wherein the lower part of the support is fixed on a building foundation part, the upper part of the rigid cross rod is fixed on a building cross beam, the left end and the right end of the cross rod are hinged with side rods, the bottoms of the side rods are hinged on the support, and the support, the cross rod and the two side rods form a parallelogram mechanism; a damping device is arranged between two opposite hinged points of the parallelogram mechanism, and the damping device comprises a motion amplification mechanism and a pneumatic damper; when the cross rod moves relative to the base, the distance between the two hinge points opposite to the parallelogram structure changes, and the motion amplification mechanism increases the motion amount of the two hinge points and drives the pneumatic damper to move. The invention aims at the structural characteristics of deformation energy absorption and stress dispersion of wood structure ancient buildings and designs an auxiliary stabilizing device capable of deforming and providing a damping effect. Avoid rigid support structure to destroy the original atress characteristics of timber structure ancient building.
Description
Technical Field
The invention relates to the technical field of historic building protection, in particular to a supporting deformation damping structure of a historic building.
Background
The Chinese historic building wood structure can still stand upright after being blown by wind and sun for thousands of years, has static force instability risk caused by deterioration and damage accumulation of daily risk sources, and faces dynamic instability risk caused by sharp increase of damage amount under sudden natural disasters. Under the action of sudden natural disasters (such as earthquakes and strong winds), the connection interface of the historic building structure can slide and the joints can rotate due to the discrete mechanical model characteristics of the historic building structure. On the other hand, the original appearance of the immovable cultural relics should be maintained as much as possible to ensure the originality of the historical information, and the existing reinforcement measures need to invade the cultural relics, so that the principle that the minimal intervention on the cultural relics is difficult to realize and the measures are reversible is difficult to realize.
Meanwhile, the reinforcing measures are not consistent with the energy consumption mechanism of the discrete body model of the historic building, and even dynamic stability performance is reduced, for example, Wenchuan earthquake damage results show that some historical repairs do not play a further protection role on the historic building, and on the contrary, the earthquake resistance of the historic building is also reduced.
Disclosure of Invention
The invention relates to a supporting deformation damping structure for an ancient building.
The technical problem to be solved is that: the existing building reinforcing structure can destroy the characteristics of a discrete mechanical model of a traditional wooden structure historic building, weaken the energy consumption capability of the historic building to abnormal natural disasters and reduce the stability of the historic building.
In order to solve the technical problem, the supporting deformation damping structure for the historic building adopts the following scheme.
A supporting deformation damping structure for an ancient building comprises a support fixed on a building foundation part at the lower part and a rigid cross rod fixed on a building cross beam at the upper part, wherein side rods are hinged at the left end and the right end of the cross rod, the bottoms of the side rods are hinged on the support, and the support, the cross rod and the two side rods form a parallelogram mechanism;
a damping device is arranged between two opposite hinged points of the parallelogram mechanism, and the damping device comprises a motion amplification mechanism and a pneumatic damper; when the cross rod moves relative to the base, the distance between the two hinge points opposite to the parallelogram structure changes, and the motion amplification mechanism increases the motion amount of the two hinge points and drives the pneumatic damper to move.
Preferably, two groups of damping devices are symmetrically arranged on the parallelogram structure left and right, and the two groups of damping devices are respectively connected with two groups of opposite hinge points of the parallelogram structure.
Preferably, the damping device further comprises a steel cable, and two ends of the steel cable are respectively arranged at two opposite hinge points of the parallelogram mechanism; the bottom of the steel cable is connected with one end of the support, and the top of the steel cable is connected with the other end of the cross rod; the cross rod is provided with a sliding groove, the upper end of the steel cable is connected with a sliding block in sliding fit with the sliding groove, the motion amplification mechanism is connected with the upper end of the steel cable, and the motion amplification mechanism is driven by the upper end of the steel cable to move.
Preferably, the motion amplification mechanism comprises a driving end and an output end, the motion distance of the output end is greater than that of the driving end, and the output end of the motion amplification mechanism is connected with the pneumatic damper; the motion amplification mechanism is a labor-consuming lever or a scissor mechanism or a gear set or a pulley block.
Preferably, the motion amplification mechanism comprises two labor-consuming levers, namely a first lever and a second lever, and a rack-and-pinion and crank-link mechanism;
the first lever is hinged on the cross rod, and the second lever is hinged on the support; the power arm of the first lever is connected with the top of the steel cable, the resistance arm of the first lever is connected with the power arm of the second lever through a rope and a pulley, the resistance arm of the second lever is connected with a rack, the rack is meshed with a gear arranged on a support, a crank which extends outwards is fixed on the gear along the radial direction of the gear, the outer end of the crank is connected with one end of a connecting rod, and the other end of the connecting rod is connected with a pneumatic damper and drives the pneumatic damper to move.
Preferably, the motion amplification mechanism is further connected with a reset mechanism, and the reset mechanism can enable the motion amplification mechanism and the pneumatic damper to return to the original position after the driving force of the motion amplification mechanism is relieved.
Preferably, the cross beam connected with the cross rod is a building door frame, a wood beam at the top of a window frame or a building structure beam, the cross rod is fixedly connected with a plurality of hoops, and the hoops embrace the cross beam tightly; the contact part of the beam and the hoop is cleaned to remove the corrosion part, and the contact interface of the beam and the hoop is kept flat without local bulges.
Preferably, the gap between the cross rod and the cross beam is not less than 1cm, the bending rigidity of the cross rod is not less than 3-5 times of that of the connected wood beam, and the material strength is not less than 7-10 times of that of the connected wood beam.
Preferably, the pneumatic damper comprises a closed cylinder, a piston rod, a piston and a return spring, wherein the piston is arranged at the inner end of the piston rod, and the outer end of the piston rod is connected with a motion amplification mechanism; the side surface of the piston profile is in contact with the inner wall of a closed cylinder, the closed cylinder is filled with gas, and the piston is provided with a gas hole; one side of the piston is connected with a return spring, and the return spring is supported on the inner wall of the closed cylinder.
Compared with the prior art, the ancient building supporting deformation damping structure has the following beneficial effects:
the structure is characterized by discrete stress and deformation energy absorption of the traditional wooden structure ancient building. A variable auxiliary stabilizing device with a damping function is designed in a targeted mode. The reinforcing and supporting device is used for reinforcing, supporting and protecting the traditional wooden structure ancient buildings.
When the building encounters vibration such as earthquake strong wind, the horizontal transverse movement of the cross beam of the historic building with the wood structure can be generated, the wood structure of the building is deformed, and then the resilience is carried out. Thereby absorbing the energy of the building vibration and protecting the building main body. But older buildings, whose wood structure itself has corroded, can no longer provide sufficient deformation and resilience.
In particular, it is mainly composed of a frame of a parallelogram mechanism. The frame of parallelogram mechanism provides the support for the crossbeam of building, consolidates ancient building. When the building is vibrated and deformed, the parallelogram mechanism can be driven to move.
When the parallelogram mechanism moves, the distance between two hinge points which are opposite to each other in a diagonal line changes. The invention arranges a motion amplifying mechanism in the parallelogram mechanism to enlarge the motion distance of the interval change, then uses the motion amplified by the motion amplifying mechanism to drive a pneumatic damper, the pneumatic damper is used for playing a damping role, and consumes the energy of the motion to reduce the deformation and rebound.
Drawings
FIG. 1 is a schematic structural diagram of an ancient building supporting deformation damping structure after installation;
FIG. 2 is a schematic view of the device in an initial state with only one damping device;
FIG. 3 is a schematic view of the apparatus of FIG. 2 after operation;
FIG. 4 is a schematic view of an alternative embodiment of the motion magnification mechanism of FIG. 2;
fig. 5 is a schematic structural view of the pneumatic damper.
Description of reference numerals:
1-a parallelogram mechanism, 1 a-a support, 1 b-a cross bar and 1 c-a side bar;
2-a damping device;
2 a-motion amplification mechanism, 2a 1-first lever, 2a 2-second lever, 2a 3-rack, 2a 4-gear, 2a 5-crank, 2a 6-connecting rod, 2a 7-rope, 2a 8-pulley,
2 b-a pneumatic damper, 2b 1-a closed cylinder, 2b 2-a piston rod, 2b 3-a piston, 2b 4-a return spring and 2b 5-an air hole;
2 c-a steel cord;
3-hoop holding;
4-a chute;
5-a cross beam;
6-building foundation;
7-a reset mechanism.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, the use of directional words such as "upper, lower, left, right" generally means upper, lower, left, right as viewed with reference to FIG. 1; "inner and outer" refer to the inner and outer relative to the profile of the components themselves. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to solve present building reinforced structure and can destroy the discrete body mechanics model characteristic of traditional timber structure ancient building self, weaken the ancient building to the power consumption ability of unusual natural disasters, reduce the problem of the stability of ancient building, this practicality provides an ancient building supports warp damping structure. As shown in fig. 1 to 4.
A supporting deformation damping structure for an ancient building is characterized by comprising a support 1a fixed on a building foundation 6 at the lower part and a rigid cross rod 1b fixed on a building cross beam 5 at the upper part, wherein the left end and the right end of the cross rod 1b are hinged with side rods 1c, the bottoms of the side rods 1c are hinged on the support 1a, and the support 1a, the cross rod 1b and the two side rods 1c form a parallelogram mechanism 1;
a damping device 2 is arranged between two opposite hinge points of the parallelogram mechanism 1, and the damping device 2 comprises a motion amplification mechanism 2a and a pneumatic damper 2 b; when the cross rod 1b moves relative to the base, the distance between the two opposite hinge points of the parallelogram structure changes, and the motion amplification mechanism 2a increases the motion amount of the two hinge points and drives the pneumatic damper 2b to move.
The structure is characterized by discrete stress and deformation energy absorption of the traditional wooden structure ancient building. A variable auxiliary stabilizing device with a damping function is designed in a targeted mode. The reinforcing and supporting device is used for reinforcing, supporting and protecting the traditional wooden structure ancient buildings. When the building encounters vibration such as earthquake strong wind, the horizontal transverse movement of the cross beam 5 of the historic building with the wood structure can occur, the deformation of the wood structure of the building can occur, and then the resilience is performed. Thereby absorbing the energy of the building vibration and protecting the building main body. But older buildings, whose wood structure itself has corroded, can no longer provide sufficient deformation and resilience.
In particular, it is mainly composed of the frame of one parallelogram mechanism 1. The frame of parallelogram mechanism 1 provides the support for crossbeam 5 of building, consolidates ancient building. When the building is vibrated and deformed, the parallelogram mechanism 1 is driven to move. When the parallelogram mechanism 1 moves, the distance between two hinge points which are opposite to each other in a diagonal line changes. The invention arranges a motion amplifying mechanism 2a in a parallelogram mechanism 1 to enlarge the motion distance of the interval change, then uses the motion amplified by the motion amplifying mechanism 2a to drive a pneumatic damper 2b, the pneumatic damper 2b is used for playing a damping role, and consumes the energy of the motion to reduce the deformation and rebound.
The main reason why ancient buildings need to be reinforced and protected is that the wood structures mainly stressed on the original building main bodies are deformed or can not provide enough supporting force any more after years of corrosion. Therefore, the most important thing for reinforcing the historic building is to provide support, the historic building supporting deformation damping structure of the invention is firstly a parallelogram mechanism 1 with a frame structure, and a bottom support 1a is arranged at a stable part of the building, generally the bottom of a door frame, the bottom of a window frame or a stable support structure formed by artificially reinforcing the building. Then the cross bar 1b at the top is supported by two side bars 1c, and the cross bar 1b is used for supporting the cross beam 5 structure of the building to disperse pressure for the cylinder of the building. However, if a fixed frame structure is directly welded with metal, the seismic energy dissipation capability of the wood structure building itself is destroyed. When external stress influences such as earthquake strong wind and the like occur, the cross beam 5 of the building can translate, the column body of the building deforms to a certain extent or the beam-column combination part of the building deforms in a torsional mode, and then resilience is carried out to absorb the energy of building vibration. This is also the core of the wooden ancient building's shock resistance. If the fixed frame is used, the horizontal transverse movement of the cross beam 5 is difficult to occur, or the connection part of the frame and the cross beam 5 is slipped, and the damage to the building is increased. The earthquake resistance and wind resistance of the building are weakened.
Therefore, the framework of the invention is a movable parallelogram mechanism 1, when a building deforms, the parallelogram mechanism 1 firstly deforms along with the building, so that the elastic shock resistance of the building is not influenced while the support protection is provided for the building.
Secondly, the resilience capability of the historic building is greatly weakened due to aging of the wood structure. Therefore, the damping device 2 is further arranged in the parallelogram mechanism 1 and used for assisting the building to absorb energy and resist earthquake when the building is stressed and deformed, so that the stress concentration of the building is reduced, and the deformation is prevented from exceeding the stress limit of an aged wood structure. At the same time, since the deformation of the building is generally not large, the damping device 2 first includes a motion amplification mechanism 2 a. The distance between the diagonals of the parallelogram mechanism 1 can be changed when the parallelogram mechanism 1 moves, and the motion amplification mechanism 2a amplifies the changed distance to drive the inertia damping device 2 to realize the damping effect.
The building foundation 6 in which the support 1a is installed is determined according to the specific structural conditions of the protected wood building, and can be a masonry foundation of a story building, a bottom cross beam 5 at the lower edge of a building window and a door opening as shown in fig. 4, or a support beam on a building floor. The support 1a forms on the one hand a parallelogram mechanism 1 and on the other hand provides a fixing and mounting base for other accessory devices.
As shown in fig. 1, when the parallelogram mechanism 1 moves, the distances between the two diagonal hinge points of the parallelogram mechanism change, and one of the two hinge points is lengthened while the other hinge point is shortened. Therefore, in order to balance stress, two groups of damping devices 2 are symmetrically arranged on the parallelogram structure from left to right, and the two groups of damping devices 2 are respectively connected with two groups of opposite hinged points of the parallelogram mechanism 1. The two opposite hinge points are the upper left and lower right hinge points and the upper right and lower left hinge points, respectively, in fig. 1.
Since the two damping devices 2 have the same structure and are symmetrically disposed at different positions, only one of them will be described in the following description. That is, as shown in fig. 2 to 4.
As shown in fig. 2, the damping device 2 further comprises a steel cable 2c, two ends of the steel cable 2c are respectively arranged at two opposite hinge points of the parallelogram mechanism 1; the bottom of the steel cable 2c is connected with one end of the support 1a, and the top of the steel cable 2c is connected with the other end of the cross rod 1 b; the cross bar 1b is provided with a sliding chute 4, the upper end of the steel cable 2c is connected with a sliding block which is in sliding fit with the sliding chute 4, the motion amplification mechanism 2a is connected with the upper end of the steel cable 2c, and the motion amplification mechanism 2a is driven by the upper end of the steel cable 2c to move. The steel cable 2c may be a hard rod or a flexible steel cable, and is herein called the steel cable 2c for the sake of name unity. The motion amplification mechanism 2a cannot be installed at the diagonal hinge point of each type of parallelogram mechanism 1 due to design standardization. Taking fig. 2 and 3 as an example, a steel cable 2c connects two diagonal hinge points of the parallelogram mechanism 1, and the bottom of the steel cable 2c is fixed at the right end of the manufacturing; the top of the cable 2c is slidably mounted to the left end of the cross bar 1b by means of a slider which slides relative to the slide slot 4, i.e. the slider moves relative to the cross bar 1b, when the parallelogram mechanism 1 moves. Then, the movement amplification mechanism 2a is simultaneously connected with the cross bar 1b and the slider, and the movement amplification mechanism 2a amplifies the relative movement of the cross bar 1b and the slider and then drives the pneumatic damper 2 b.
The motion amplification mechanism 2a comprises a driving end and an output end, the motion distance of the output end is greater than that of the driving end, and the output end of the motion amplification mechanism 2a is connected with the pneumatic damper 2 b; the motion amplification mechanism 2a is a labor-consuming lever or scissor mechanism or a gear 2a4 set or a pulley 2a8 set. The motion amplification mechanism 2a of the embodiment of fig. 2 employs a combination of a laborious lever and pulley 2a8 set. What is used in the embodiment of figure 3 is a combination of a scissors mechanism, a set of pulleys 2a8 and a laborious lever. Other combinations of sets of gears 2a4 are also possible, as may be determined by the actual circumstances at the site.
As shown in fig. 2 and 3, the motion amplification mechanism 2a comprises two laborious levers, a first lever 2a1 and a second lever 2a2, and a gear 2a4, a rack 2a3 and a crank 2a5 and link 2a6 mechanism; the first lever 2a1 is hinged on the cross bar 1b, and the second lever 2a2 is hinged on the support 1 a; the power arm of the first lever 2a1 is connected with the top of the cable 2c, the resistance arm of the first lever 2a1 is connected with the power arm of the second lever 2a2 through the rope 2a7 and the pulley 2a8, the resistance arm of the second lever 2a2 is connected with the rack 2a3, the rack 2a3 is meshed with the gear 2a4 arranged on the support 1a, the gear 2a4 is fixed with the outward extending crank 2a5 along the radial direction, the outer end of the crank 2a5 is connected with one end of the connecting rod 2a6, and the other end of the connecting rod 2a6 is connected with the pneumatic damper 2b and drives the pneumatic damper 2b to move. Wherein the rack 2a3 and the second lever 2a2 are rotatably mounted, and an elastic member is provided between the rack 2a3 and the second lever 2a2, and the elastic member presses the rack 2a3 toward the gear 2a 4.
In the case that the amplification ratio required by the motion amplification mechanism 2a is not large, the crank 2a5 rocker and the gear 2a4 rack 2a3 mechanism can be eliminated, the resistance arm of the second lever 2a2 is directly connected with the connecting rod 2a6, and the connecting rod 2a6 is connected with the pneumatic damper 2b to drive the pneumatic damper 2b to move. Or the second lever 2a2 is directly connected to the piston rod 2b2 of the pneumatic damper 2b, and then the pneumatic damper 2b is rotatably mounted on the mount 1a through a hinge mount.
When the steel cable 2c is a flexible steel cable, the steel cable can only provide tension, so the motion amplification mechanism 2a is also connected with a reset mechanism 7, and the reset mechanism 7 can enable the motion amplification mechanism 2a and the pneumatic damper 2b to return to the original position after the driving force of the motion amplification mechanism 2a is relieved. In particular, this return mechanism 7 can be a return spring 2b4, can be rod-shaped between the power arm of the second lever 2a2 and the abutment 1a, or can be provided on the pneumatic damper 2 b. As shown in fig. 2, firstly, the cross bar 1b of the parallelogram mechanism 1 moves to the left, which causes the steel wire rope to draw the sliding block to slide, then the motion amplification structure drives the pneumatic damper 2b, and the pneumatic damper 2b in turn can transmit damping force to the parallelogram mechanism 1 to absorb the energy of the building vibration. The return spring 2b4 charges energy while the pneumatic damper 2b is driven. When the cross bar 1b of the parallelogram mechanism starts to move rightwards, the reset mechanism 7 releases energy to drive the motion amplification mechanism 2a to reset.
As shown in fig. 4, the cross beam 5 connected with the cross bar 1b is a building door frame, a wood beam at the top of a window frame or a building structure beam, the cross bar 1b is fixedly connected with a plurality of hoops 3, and the hoops 3 tightly encircle the cross beam 5; the contact part of the beam 5 and the hoop 3 is cleaned to remove the corrosion part, and the contact interface of the beam 5 and the hoop 3 is kept flat without local bulges.
The gap between the cross rod 1b and the cross beam 5 is not less than 1cm, the bending rigidity of the cross rod 1b is not less than 3-5 times of that of the connected wood beam, and the material strength is not less than 7-10 times of that of the connected wood beam.
As shown in fig. 5, the pneumatic damper 2b comprises a closed cylinder 2b1, a piston rod 2b2, a piston 2b3 and a return spring 2b4, wherein the inner end of the piston rod 2b2 is provided with the piston 2b3, and the outer end of the piston rod 2b2 is connected with the motion amplification mechanism 2 a; the side surface of the contour of the piston 2b3 is in contact with the inner wall of a closed cylinder 2b1, the closed cylinder 2b1 is filled with gas, and the piston 2b3 is provided with a gas hole 2b 5; the piston 2b3 is connected to a return spring 2b4, and the return spring 2b4 is supported on the inner wall of the closed cylinder 2b 1. The pneumatic damper 2b is a device for obtaining a damping effect by utilizing an increase in pressure and flow rate when a fluid passes through a small hole. The damping force increases with the increase of the movement speed.
In this embodiment, the hoop plate is arc-shaped, so that the hoop 3 is suitable for a circular wood beam, the wing plate is welded to the arc-shaped hoop plate, the wing plate is provided with two connecting holes, and the diameter of the screw fastening assembly in the connecting hoop 3, the diameter of the connecting holes and the diameter of the bolts in the screw fastening assembly are both 10 mm. The 3 boards of staple bolt include hoop board and pterygoid lamina, and the material of 3 boards of staple bolt is steel. The thickness of 3 plates of staple bolt is 10mm, and the first half circular arc radius of hoop is 160mm, and the pterygoid lamina is long 50mm, and width 30mm, thickness are 10mm, and the connecting hole is diameter 10mm, and screw thread place cylinder length is 30mm, and the screw thread external diameter is 15mm, and middle part solid abdomen post body length is 100 mm.
The depth of the arc-shaped sliding chute 4 is 20mm, and the arc-shaped sliding chute 4 is formed by two arcs with the radius of 450mm and 500mm respectively by taking the connecting point of the motion amplification mechanism 2a and the hinged support 1a as the center of a circle; the sliding block is a circular steel block with the diameter of 50mm and the thickness of 20 mm.
As shown in fig. 2, the hinge support 1a of the first lever 2a1 is fixedly connected with the cross bar 1b of the parallel four-bar linkage 2a6 mechanism by bolts. The hinge point of the first lever 2a1 is connected with the hinge support 1a through a pin shaft at a position 0.2 times longer than the self rod of the upper end point, the upper end of the first lever 2a1 is connected with the sliding block through a pin shaft, the first lever 2a1 and the second lever 2a2 are both made of 355MPa steel, and the hinge support 1a is made of 550MPa steel with yield strength. In this embodiment, the first lever 2a1 is 740mm long, the first lever 2a1 has a box-shaped cross-section of 0.1m 0.012m, and the bearing diameter at both ends of the first lever 2a1 is 30 mm.
As shown in fig. 2-3, the connecting lug plate at the upper left end of the stay cable is hinged with the slide block through a pin shaft, and the lower right end of the stay cable is connected with the hinge shaft of the parallel four-bar linkage 2a6 mechanism. In this embodiment, cable diameter 10mm, the connection otic placode is 50mm for the internal diameter, and the external diameter is 60 mm's ring, makes the ring inner wall enough smooth, and coefficient of friction is 0.15. The material of the inhaul cable is zinc-5% aluminum-rare earth alloy coating high-strength steel cable 2c, the yield strength is 400MPa, the ultimate strength is 540MPa, and the elastic modulus is 200000 MPa.
In this embodiment, the initial angle of the rope 2a7 to the first lever 2a1 is 75 °, the diameter of the crown block 2a8 is 80mm, and the diameter of the arc chute 4 is 12 mm. The section of the lever girder is a box-shaped section with 0.12m 0.1m 0.012m, the length of the lever girder is 850mm, and the lever girder is connected with the supporting seat at the position of 0.3 times of the length of the lever girder.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. The supporting deformation damping structure for the historic building is characterized by comprising a support (1 a) fixed to a building foundation (6) at the lower part and a rigid cross rod (1 b) fixed to a building cross beam (5) at the upper part, wherein side rods (1 c) are hinged to the left end and the right end of the cross rod (1 b), the bottoms of the side rods (1 c) are hinged to the support (1 a), and a parallelogram mechanism (1) is enclosed by the support (1 a), the cross rod (1 b) and the two side rods (1 c);
a damping device (2) is arranged between two hinge points at the diagonal position of the parallelogram mechanism (1), and the damping device (2) comprises a motion amplification mechanism (2 a) and a pneumatic damper (2 b); when the cross rod (1 b) moves relative to the base, the distance between two opposite hinge points of the parallelogram structure changes, and the motion amplification mechanism (2 a) increases the motion amount of the two hinge points and drives the pneumatic damper (2 b) to move.
2. The historic building support deformation damping structure according to claim 1, wherein two sets of damping devices (2) are symmetrically arranged on the parallelogram structure left and right, and the two sets of damping devices (2) are respectively connected with two sets of hinge points of the parallelogram mechanism (1) which are opposite to each other in the diagonal position.
3. The historic building support deformation damping structure according to claim 1, wherein the damping device (2) further comprises a steel cable (2 c), two ends of the steel cable (2 c) are respectively arranged at two opposite hinging points of the parallelogram mechanism (1); the bottom of the steel cable (2 c) is connected with one end of the support (1 a), and the top of the steel cable (2 c) is connected with the other end of the cross rod (1 b);
the cross rod (1 b) is provided with a sliding groove (4), the upper end of the steel cable (2 c) is connected with a sliding block in sliding fit with the sliding groove (4), the motion amplification mechanism (2 a) is connected with the upper end of the steel cable (2 c), and the motion amplification mechanism (2 a) is driven to move by the upper end of the steel cable (2 c).
4. The historic building support deformation damping structure according to claim 3, wherein the motion amplification mechanism (2 a) comprises a driving end and an output end, the motion distance of the output end is larger than that of the driving end, and the output end of the motion amplification mechanism (2 a) is connected with a pneumatic damper (2 b);
the motion amplification mechanism (2 a) is a labor-consuming lever or scissor mechanism or a gear (2 a 4) group or a pulley group.
5. Ancient building supporting deformation damping structure according to claim 4, characterized by that, the motion amplification mechanism (2 a) includes two strenuous levers of first lever (2 a 1) and second lever (2 a 2), and gear (2 a 4) rack (2 a 3) and crank (2 a 5) link (2 a 6) mechanism;
the first lever (2 a 1) is hinged on the cross bar (1 b), and the second lever (2 a 2) is hinged on the support (1 a); the power arm of the first lever (2 a 1) is connected with the top of a steel cable (2 c), the resistance arm of the first lever (2 a 1) is connected with the power arm of the second lever (2 a 2) through a rope (2 a 7) and a pulley (2 a 8), the resistance arm of the second lever (2 a 2) is connected with a rack (2 a 3), the rack (2 a 3) is meshed with a gear (2 a 4) arranged on a support (1 a), an outward-extending crank (2 a 5) is fixed on the gear (2 a 4) along the radial direction of the gear, the outer end of the crank (2 a 5) is connected with one end of a connecting rod (2 a 6), and the other end of the connecting rod (2 a 6) is connected with a pneumatic damper (2 b) and drives the pneumatic damper (2 b) to move.
6. The supporting deformation damping structure for the historic building according to claim 1, wherein a reset mechanism (7) is further connected to the motion amplification mechanism (2 a), and the reset mechanism (7) can enable the motion amplification mechanism (2 a) and the pneumatic damper (2 b) to return to the original position after the driving force of the motion amplification mechanism (2 a) is released.
7. The supporting deformation damping structure for the historic building according to claim 1, wherein the cross beam (5) connected with the cross rod (1 b) is a wooden beam at the top of a building door frame or a window frame or a building structure beam, a plurality of hoops (3) are fixedly connected to the cross rod (1 b), and the hoops (3) encircle and tightly clamp the cross beam (5); the contact part of the cross beam (5) and the hoop (3) is cleaned to remove the corrosion part, and the contact interface between the cross beam (5) and the hoop (3) is kept flat and free of local bulges.
8. The supporting deformation damping structure for the historic building is characterized in that the gap between the cross rod (1 b) and the cross beam (5) is not less than 1cm, the bending rigidity of the cross rod (1 b) is not less than 3-5 times of the bending rigidity of the connected wood beam, and the material strength is not less than 7-10 times of the material strength of the connected wood beam.
9. The antique building supporting deformation damping structure according to claim 1, wherein the pneumatic damper (2 b) comprises a closed cylinder (2 b 1), a piston rod (2 b 2), a piston (2 b 3) and a return spring (2 b 4), the piston (2 b 3) is installed at the inner end of the piston rod (2 b 2), and the outer end of the piston rod (2 b 2) is connected with the movement amplification mechanism (2 a); the side surface of the contour of the piston (2 b 3) is in contact with the inner wall of a closed cylinder (2 b 1), the closed cylinder (2 b 1) is filled with gas, and the piston (2 b 3) is provided with a gas hole (2 b 5); one side of the piston (2 b 3) is connected with a return spring (2 b 4), and the return spring (2 b 4) is supported on the inner wall of the sealed cylinder (2 b 1).
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