CN112878168B - Variable-friction-resistance long-span continuous beam system - Google Patents
Variable-friction-resistance long-span continuous beam system Download PDFInfo
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- CN112878168B CN112878168B CN202110024588.4A CN202110024588A CN112878168B CN 112878168 B CN112878168 B CN 112878168B CN 202110024588 A CN202110024588 A CN 202110024588A CN 112878168 B CN112878168 B CN 112878168B
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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
- E01D1/00—Bridges in general
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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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01D19/04—Bearings; Hinges
- E01D19/042—Mechanical bearings
- E01D19/046—Spherical bearings
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Abstract
The invention relates to a variable friction resistance long-span continuous beam system, which comprises: a beam body; the pier body is supported below the beam body; a foundation; and the variable friction resistance support is arranged between the beam body and the pier body. Under the action of normal operation load, the relative sliding surface of the beam body and the pier body is a plane, when the beam body stretches, the height of the bridge floor is not changed, the driving safety of a high-speed railway is not influenced, the friction coefficient of the sliding surface is low, and the size of the pier body of a lower structure can be reduced; under the action of rare earthquakes, the relative sliding surface of the beam body and the pier body is a spherical surface, so that the self-vibration period of the bridge structure can be prolonged, the earthquake response can be reduced, the earthquake resistance of the long-span and long-link continuous beam system can be improved, and meanwhile, the spherical sliding surface has a higher friction coefficient and plays a role in energy consumption.
Description
Technical Field
The invention relates to the technical field of high-speed railway bridge engineering, in particular to a friction-resistance-variable long-span continuous beam system.
Background
At present, a simply supported beam structure is usually the preferred structural form of a high-speed railway bridge, the economic span of the simply supported beam structure is within 50m, in order to meet the requirements of seamless track steel rail stress and driving comfort, a lower structure has the requirement of minimum longitudinal horizontal line rigidity, and a pier body designed according to the method is large in size. In order to meet the flood control requirements of bridges crossing rivers, the water resistance of the lower part structure of the bridge is not more than 5%, so that the structure of the simply supported beam is limited. The continuous beam has large structural span, the movable pier has no requirement on minimum rigidity, the size of the pier body meets the stress requirement, the general continuous beam span is more than 80m and can meet the requirement that the water resistance rate is not more than 5 percent, and the defect that two ends of the continuous beam need to be provided with track telescopic regulators to increase the operation and maintenance difficulty. In order to reduce the arrangement of the track telescopic regulator, a long-span long-connection continuous beam system can be adopted.
In the related technology, a long-span continuous beam system meets the requirement of earthquake resistance, and a friction pendulum support with a spherical sliding surface is adopted, so that the beam body can swing freely, and the aims of vibration reduction and energy consumption can be better achieved. However, in the long-span continuous beam system, under the action of temperature, the beam body has large elongation (shortening) displacement, and when the support slides on a spherical surface along with the beam body, the height of the support is increased, and the beam body is lifted, so that the driving safety of a high-speed railway is influenced; meanwhile, in order to meet the requirement of earthquake resistance and energy consumption, the friction coefficient of the friction pendulum support is large, and under the action of normal operation load, when the beam body extends (shortens), the movable pier top is subjected to large horizontal frictional resistance, the size of the lower part structure is large, and the construction cost is high.
Therefore, there is a need to design a new friction-variable long-span continuous beam system to overcome the above problems.
Disclosure of Invention
The embodiment of the invention provides a variable-friction-resistance long-span continuous beam system, which aims to solve the problem that in the prior art, in order to meet the requirement of seismic resistance and energy consumption of the long-span continuous beam system, when a friction pendulum support is adopted, the support slides on a spherical surface along with a beam body, the height of the support is increased, the beam body is lifted, and the driving safety of a high-speed railway is influenced; meanwhile, the friction pendulum support has a large friction coefficient, and under the action of normal operation load, the movable pier top bears large horizontal frictional resistance, so that the lower part structure has a large size and the construction cost is high.
In a first aspect, there is provided a variable friction long span continuous beam system comprising: a beam body; the pier body is supported below the beam body; the foundation is positioned at the bottom of the pier body; locate the roof beam body with become friction between the pier shaft and hinder the support, its include with the roof beam body fixed last bedplate is located go up the well bedplate below, go up the bedplate with set up the plane sliding plate between the well bedplate, become friction and hinder the support still including locating the lower bedplate below well bedplate, well bedplate with set up the sphere sliding plate between the bedplate down.
In some embodiments, the joint length L of the beam body is greater than 1000m, and the maximum joint length L is determined by the allowable movable displacement of the telescopic adjusters at two ends of the beam body; the single span Ls of the beam body is comprehensively determined according to economic and technical indexes and the water resistance of the pier body, and the value is greater than or equal to 60m.
In some embodiments, the coefficient of friction of the planar sliding plate is less than the coefficient of friction of the spherical sliding plate.
In some embodiments, the pier body comprises a fixed pier and movable piers arranged on two sides of the fixed pier along the longitudinal bridge direction, and the variable friction resistance support is arranged at the top of the movable pier; and the top of the fixed pier is provided with a one-way movable friction pendulum support and a fixed friction pendulum support for fixing the beam body.
In some embodiments, under normal operation load, the relative sliding surface of the beam body and the movable pier occurs on the plane sliding plate, and the friction coefficient of the plane sliding plate is less than or equal to 0.03.
In some embodiments, the sliding surface of the beam body relative to the movable pier is generated on the spherical sliding plate under the action of rare earthquakes, and the friction coefficient of the spherical sliding plate is greater than 0.05.
In some embodiments, a spherical cap lining plate is clamped between the middle seat plate and the lower seat plate, and the upper surface and the lower surface of the spherical cap lining plate are both convex spherical surfaces.
In some embodiments, the friction-variable support comprises a unidirectional movable friction-variable support and a bidirectional movable friction-variable support which are arranged on the same pier body, the unidirectional movable friction-variable support and the bidirectional movable friction-variable support are arranged along a transverse bridge direction, a middle seat plate of the unidirectional movable friction-variable support is provided with a first limiting block positioned on the periphery of the lower seat plate, and the first limiting block is used for limiting the middle seat plate to slide along a longitudinal bridge direction and a transverse bridge direction; the middle seat plate of the bidirectional movable friction resistance-variable support is provided with second limiting blocks located on two opposite sides of the lower seat plate, and the second limiting blocks are used for limiting the middle seat plate to slide along the longitudinal bridge direction.
In some embodiments, the first limiting block is connected with the middle seat plate of the unidirectional movable type friction resistance variable support through a shear pin; and the second limiting block is connected with the middle seat plate of the bidirectional movable friction resistance changing support through a shear pin.
In some embodiments, the upper seat plate is provided with a speed locker, the speed locker connects the upper seat plate and the middle seat plate, and the speed locker automatically locks when the upper seat plate and the middle seat plate slide relatively fast.
The working principle of the variable friction resistance long-span long-connection continuous beam system provided by the embodiment of the invention is as follows:
under the normal operation load action (temperature, shrinkage, creep and the like), when the beam body extends (shortens), the relative sliding surface of the beam body and the pier body occurs on a plane sliding plate between an upper seat plate and a middle seat plate of the variable friction resistance support, the plane sliding plate has a lower friction coefficient, and the horizontal friction force borne by the movable pier and the foundation is small, so that the structure size of the pier body is small; and the sliding surface is a plane, so that the bridge deck elevation does not change when the beam body stretches, and the traffic safety of the high-speed railway is not influenced.
Under the earthquake effect of meeting more, when the roof beam body takes place quick relative slip with the pier shaft, speed locking ware will automatic locking, and at this moment, the function of activity type variable friction resistance support performance fixing support for the structure becomes a plurality of fixing piers by a fixing pier under the normal operation operating mode, goes a plurality of pier shafts with superstructure's load distribution effectively, makes pier shaft, basic atress even.
Under rare meets earthquake effect, when the quick relative slip takes place for the roof beam body and pier shaft, speed locker also will automatic locking, the function of fixing support is played to the movable type variable friction resistance support, and when the horizontal load that the support receives was greater than the horizontal anti-shear capacity of shear pin, the stopper of movable type variable friction resistance support and fixed type friction pendulum support, one-way movable type friction pendulum support drops, the roof beam body passes through the free swing of spherical crown welt, and its glide plane is the sphere, can prolong bridge structures self-oscillation period, reduce earthquake response, improves the anti-seismic performance of big span long antithetical couplet continuous beam system, and the sphere glide plane has higher coefficient of friction simultaneously, can play the power consumption effect.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides a variable-friction long-span continuous beam system, which is characterized in that a variable-friction support is arranged between a beam body and a pier body, a planar sliding plate is arranged between an upper seat plate and a middle seat plate of the variable-friction support, the relative sliding surface of the beam body and the pier body is a plane under the action of normal operation load, and when the beam body stretches, the height of the support is unchanged, the height of a bridge deck is unchanged, and the driving safety of a high-speed railway is not influenced; meanwhile, the friction coefficient of the plane sliding surface is low, the horizontal friction resistance borne by the pier body is small, the section size of the pier body can be greatly reduced, the water resistance rate is reduced, and the construction cost is saved.
The spherical sliding plate is arranged between the middle seat plate and the lower seat plate of the friction resistance variable support, under the action of rare earthquakes, the relative sliding surface of the beam body and the movable pier is spherical, the beam body can swing freely, the self-vibration period of the bridge structure is prolonged, the earthquake response is reduced, the earthquake resistance of the long-span continuous beam system is improved, and meanwhile, the spherical sliding surface has higher friction coefficient and can play a role in energy consumption.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a variable-friction long-span continuous beam system according to an embodiment of the present invention;
FIG. 2 is a schematic view of the arrangement of a support of a variable friction resistance long-span continuous beam system provided by an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a unidirectional movable type friction-variable support according to an embodiment of the present invention;
fig. 4 is a schematic structural view of the bidirectional movable type friction-variable support according to the embodiment of the present invention.
In the figure: 1. a beam body; 2. a pier body; 21. fixing the pier; 22. moving the pier; 3. a foundation; 4. a friction resistance changing support; 4a, a one-way movable friction resistance changing support; 4b, a bidirectional movable friction resistance changing support; 41. an upper seat plate; 41a, a first upper seat plate; 41b, a second upper seat plate; 411. a flange; 42. a middle seat plate; 42a, a first middle seat plate; 42b, a second middle seat plate; 43. a lower seat plate; 43a, a first lower seat plate; 43b, a second lower seat plate; 44. a planar sliding plate; 45. a spherical sliding plate; 451. an upper spherical surface sliding plate; 452. a lower spherical surface sliding plate; 46. a first stopper; 47. a second limiting block; 48. a spherical cap liner plate; 5. a shear pin; 6. a speed locker; 7. a one-way movable friction pendulum support; 8. fixed type friction pendulum support.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The embodiment of the invention provides a variable-friction-resistance long-span continuous beam system, which can solve the problem that in the related art, in order to meet the requirement of seismic resistance and energy consumption of the long-span continuous system, when a friction pendulum support is adopted and slides on a spherical surface along with a beam body, the height of the support is increased, the beam body is lifted, and the driving safety of a high-speed railway is influenced; meanwhile, the friction coefficient of the friction pendulum support is large, under the action of normal operation load, the movable pier top is subjected to large horizontal frictional resistance, the size of the lower structure is large, and the construction cost is high.
Referring to fig. 1, 3 and 4, a friction-variable long-span continuous beam system provided by an embodiment of the present invention may include: the beam body 1 can be made of concrete or steel structures, the maximum joint length L of the beam body 1 is determined by the allowable movable displacement of the telescopic regulators positioned at two ends of the beam body 1, in order to reduce the arrangement number of the telescopic regulators at the beam ends, the joint length L of the beam body 1 is generally larger than 1000m, and the single span length Ls of the beam body is comprehensively determined according to economic and technical indexes and the water blocking rate of a lower structure and generally not smaller than 60m; the pier body 2 is supported below the beam body 1, the foundation 3 is arranged at the bottom of the pier body 2, and the load borne by the beam body 1 can be transmitted to the foundation through the pier body 2 and the foundation 3; the variable friction resistance support 4 arranged between the beam body 1 and the pier body 2 can comprise an upper seat plate 41 fixed with the beam body 1 and a middle seat plate 42 positioned below the upper seat plate 41, a plane sliding plate 44 is arranged between the upper seat plate 41 and the middle seat plate 42, the relative sliding surface of the beam body 1 and the pier body 2 is a plane under the action of normal operation load, the height of the support is unchanged and the height of the bridge deck is unchanged when the beam body 1 extends and retracts, wherein the direction indicated by an arrow in the figure 2 represents the sliding direction of the support under the action of normal operation load; become friction and hinder support 4 and still including locating the lower bedplate 43 of well bedplate 42 below, set up spherical sliding plate 45 between well bedplate 42 and the lower bedplate 43, under rare chance earthquake load effect, the relative glide plane of the roof beam body 1 and pier shaft 2 is the sphere, and the roof beam body 1 can freely swing, prolongs bridge structures natural vibration cycle, reduces earthquake response, improves the anti-seismic performance who strides long continuous beam system greatly, and spherical sliding plate 45 has higher coefficient of friction simultaneously, can play the power consumption effect.
Referring to fig. 1, 3 and 4, in some embodiments, the plane sliding plate 44 and the spherical sliding plate 45 may be made of teflon plates, so that the plane sliding plate 44 and the spherical sliding plate 45 have low friction coefficients.
The friction coefficient of the plane sliding plate 44 is smaller than that of the spherical sliding plate 45, and the smaller friction coefficient of the plane sliding plate 44 ensures that the friction resistance transmitted to the pier body 2 is smaller when the beam body 1 and the pier body 2 slide relatively under the action of temperature, shrinkage, creep and the like, so that the section size of the pier body 2 can be reduced, the water resistance is reduced, and the construction cost is saved; meanwhile, under the action of rare earthquakes, the large friction coefficient of the spherical sliding plate 45 can better achieve the purpose of energy consumption, and the anti-seismic performance of the long-span long-connection continuous beam system is improved.
Referring to fig. 3 to 4, preferably, in order to reduce the horizontal frictional resistance of the pier top of the pier body 2 under the normal operating load condition and reduce the sectional size of the pier body 2, the friction coefficient of the plane sliding plate 44 should be less than or equal to 0.03.
Referring to fig. 2 to 4, preferably, in order to ensure that the friction resistance of the friction-changing support 4 is high under the action of rare earthquakes, and to achieve a good energy consumption effect, the friction coefficient of the spherical sliding plate 45 is preferably greater than 0.05.
Referring to fig. 2-4, in some embodiments, upper seat pan 41 may be provided with a flange 411 in the transverse bridge direction that mates with middle seat pan 42, flange 411 serving to limit the transverse horizontal displacement of upper seat pan 41.
Referring to fig. 2 to 4, in some embodiments, a spherical cap liner plate 48 may be sandwiched between the middle seat plate 42 and the lower seat plate 43, the upper and lower surfaces of the spherical cap liner plate 48 may be designed as convex spherical surfaces, the upper spherical sliding plate 451 is disposed between the middle seat plate 42 and the spherical cap liner plate 48 and respectively attached to the surfaces of the middle seat plate 42 and the spherical cap liner plate 48, and the lower spherical sliding plate 452 is disposed between the spherical cap liner plate 48 and the lower seat plate 43 and respectively attached to the surfaces of the spherical cap liner plate 48 and the lower seat plate 43, so that the beam body 1 may swing freely under the action of rare earthquakes, thereby prolonging the self-vibration period of the bridge structure and reducing the earthquake response; when the earthquake disappears, the beam body can be reset to the initial state, and the influence on the stress of the structure is reduced.
Referring to fig. 2 to 4, in some alternative embodiments, the friction varying support 4 may include a unidirectional movable friction varying support 4a and a bidirectional movable friction varying support 4b provided on the same pier body 2, the unidirectional movable friction varying support 4a and the bidirectional movable friction varying support 4b on the same pier body 2 are arranged in a transverse bridge direction, in this embodiment, the upper seat plate 41 of the unidirectional movable friction varying support 4a may be referred to as a first upper seat plate 41a, the middle seat plate 42 of the unidirectional movable friction varying support 4a may be referred to as a first middle seat plate 42a, the lower seat plate 43 of the unidirectional movable friction varying support 4a may be referred to as a first lower seat plate 43a, the upper seat plate 41 of the bidirectional movable friction varying support 4b may be referred to as a second upper seat plate 41b, the middle seat plate 42 of the bidirectional movable friction varying support 4b may be referred to as a second middle seat plate 42b, and the lower seat plate 43b of the bidirectional movable friction varying support 4b may be referred to as a second lower seat plate 43b; the first middle seat plate 42a is provided with first limit blocks 46 positioned around the first lower seat plate 43a, namely, the first limit blocks 46 are arranged along the transverse bridge direction and the longitudinal bridge direction and are used for limiting the first middle seat plate 42a to slide along the longitudinal bridge direction and the transverse bridge direction; the second middle seat plate 42b is provided with second limit blocks 47 positioned at two opposite sides of the second lower seat plate 43b, and the second limit blocks 47 are arranged along the longitudinal bridge direction and can limit the second middle seat plate 42b to move along the longitudinal bridge direction; by arranging the first limiting block 46 and the second limiting block 47, under the normal operation load of the bridge, the first middle seat plate 42a and the first lower seat plate 43a do not have relative displacement in the longitudinal direction, the second middle seat plate 42b and the second lower seat plate 43b do not have relative displacement in the longitudinal direction, so that the relative horizontal longitudinal sliding displacement of the variable friction resistance support 4 is ensured to occur between the first upper seat plate 41a and the first middle seat plate 42a and between the second upper seat plate 41b and the second middle seat plate 42b, the free rotation surface occurs between the first middle seat plate 42a and the first lower seat plate 43a and between the second middle seat plate 42b and the second lower seat plate 43b, the relative sliding surface is a plane, when the beam body stretches, the height of the support is not changed, and the elevation of the beam body 1 is not changed.
Referring to fig. 3 to 4, in some embodiments, the first stopper 46 may be connected to the first middle seat plate 42a by a shear pin 5; and the second limiting block 47 can also be connected with the second middle seat plate 42b through the shear pin 5, under the action of rare earthquake, when the horizontal load along the longitudinal direction borne by the variable friction resistance support 4 is greater than the horizontal shear-resistant bearing capacity of the shear pin 5, the shear pin 5 is cut off, the first limiting block 46 and the second limiting block 47 along the longitudinal bridge direction fall off, the beam body 1 can freely swing through the spherical crown lining plate 48, the self-vibration period of the bridge structure is prolonged, the earthquake response is reduced, the energy consumption purpose is achieved through the higher friction resistance of the spherical sliding plate 45, and the earthquake-resistant performance of the long-span continuous beam system is improved.
Referring to fig. 3 to 4, in some alternative embodiments, the upper seat plate 41 may be provided with a speed locker 6, the speed locker 6 connects the upper seat plate 41 and the middle seat plate 42, when the upper seat plate 41 slides relatively rapidly with the middle seat plate 42 following the beam body 1 under the action of an earthquake, the speed locker 6 automatically locks, the upper seat plate 41 and the middle seat plate 42 are fixed and cannot slide relatively, and meanwhile, due to the arrangement of the first limiting block 46 and the second limiting block 47, the friction-variable support 4 performs a fixed support function, so that the horizontal load of the beam body 1 is effectively distributed on the multiple pier bodies 2, and the structure is uniformly stressed.
Referring to fig. 1 and 2, in some embodiments, the pier body 2 may include a fixed pier 21 and movable piers 22 disposed at both sides of the fixed pier 21 along the longitudinal bridge direction, wherein the fixed pier 21 is preferably disposed at a position close to the temperature fixed point, and the variable friction resistance support 4 is disposed at the top of the movable pier 22; the top of the fixed pier 21 is provided with a one-way movable friction pendulum support 7 and a fixed friction pendulum support 8, the fixed friction pendulum support 8 can limit the displacement of the beam body 1 in the transverse bridge direction and the longitudinal bridge direction, and the one-way movable friction pendulum support 7 can limit the displacement of the beam body 1 in the longitudinal bridge direction.
The principle of the variable-friction long-span continuous beam system provided by the embodiment of the invention is as follows:
according to the invention, the friction-variable support 4 is arranged between the beam body 1 and the pier body 2, so that a constraint system of a conventional long-span continuous beam system is changed, the friction-variable support 4 has different sliding surfaces under different load working conditions, and the friction coefficient can be changed.
Under the action of normal operation load (action of temperature, contraction, creep and the like), when the beam body 1 extends (shortens), the relative sliding surface of the beam body 1 and the movable pier 22 is generated between the upper seat plate 41 and the middle seat plate 42 of the variable friction resistance support 4, the sliding surface is a plane, when the beam body 1 extends and contracts, the height of the support is unchanged, the height of a bridge deck is not changed, and the driving safety of a high-speed railway is not influenced; meanwhile, because the plane sliding plate 44 arranged between the upper seat plate 41 and the middle seat plate 42 has a lower friction coefficient, the horizontal friction resistance on the pier top of the movable pier 22 is small, the section size of the pier body can be reduced, the water blocking rate is reduced, and the construction cost is saved.
Under the action of a frequently encountered earthquake, when the upper seat plate 41 and the middle seat plate 42 of the variable friction resistance support 4 slide relatively quickly, the speed locker 6 locks automatically, the movable variable friction resistance support 4 plays a role of a fixed support, so that the structure is changed into a plurality of fixed piers from one fixed pier under the normal working condition, the horizontal load of the upper structure is effectively distributed to a plurality of pier bodies 2, and the stress of the structure is uniform.
Under the action of rare earthquakes, the speed locker 6 is also automatically locked, the movable variable friction resistance support 4 plays a role of a fixed support, when the horizontal load borne by the support is greater than the horizontal shear bearing capacity of the shear pin 5, the shear pin 5 is sheared, the first limiting block 46 and the second limiting block 47 fall off, the beam body 1 can freely swing through the spherical crown lining plate 48, the self-vibration period of the bridge structure is prolonged, the earthquake response is reduced, the energy consumption purpose is achieved through the higher friction resistance of the spherical sliding plate 45, and the earthquake resistance performance of a long-span continuous beam system is improved.
It is worth mentioning that although the horizontal friction force on the pier top is larger than that on the normal operation working condition under the action of rare earthquake, the lower friction coefficient of the variable friction movable support under the normal operation working condition can achieve the purposes of reducing the section size of the pier body, reducing the water blocking rate and saving the engineering cost due to the load combination of the two working conditions and the different allowable improvement coefficients of the materials (detailed in the following table).
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A variable friction resistance long span continuous beam system is characterized by comprising:
a beam body (1);
the pier body (2) is supported below the beam body (1);
the foundation (3) is positioned at the bottom of the pier body (2);
the variable friction resistance support (4) is arranged between the beam body (1) and the pier body (2) and comprises an upper seat plate (41) fixed with the beam body (1) and a middle seat plate (42) positioned below the upper seat plate (41), a plane sliding plate (44) is arranged between the upper seat plate (41) and the middle seat plate (42),
the friction resistance varying support (4) further comprises a lower seat plate (43) arranged below the middle seat plate (42), and a spherical sliding plate (45) is arranged between the middle seat plate (42) and the lower seat plate (43);
the variable friction resistance support (4) comprises a one-way movable variable friction resistance support (4 a) and a two-way movable variable friction resistance support (4 b) which are arranged on the same pier body (2), the one-way movable variable friction resistance support (4 a) and the two-way movable variable friction resistance support (4 b) are arranged along the transverse bridge direction,
a middle seat plate (42) of the unidirectional movable type friction resistance changing support (4 a) is provided with a first limiting block (46) positioned on the periphery of the lower seat plate (43), and the first limiting block (46) is used for limiting the middle seat plate (42) to slide along the longitudinal bridge direction and the transverse bridge direction;
the middle seat plate (42) of the bidirectional movable friction resistance changing support (4 b) is provided with second limiting blocks (47) positioned on two opposite sides of the lower seat plate (43), and the second limiting blocks (47) are used for limiting the middle seat plate (42) to slide along the longitudinal bridge direction;
the upper seat plate (41) is provided with a speed locker (6), the speed locker (6) is connected with the upper seat plate (41) and the middle seat plate (42), and when the upper seat plate (41) and the middle seat plate (42) slide relatively fast, the speed locker (6) is automatically locked.
2. The variable friction long span continuous beam system according to claim 1, wherein:
the joint length L of the beam body (1) is more than 1000m, and the maximum joint length L is determined by the allowable movable displacement of the telescopic regulators at the two ends of the beam body (1);
the single-span Ls of the beam body (1) is comprehensively determined according to economic and technical indexes and the water blocking rate of the pier body (2), and the value is larger than or equal to 60m.
3. The variable friction long span continuous beam system according to claim 1, wherein:
the coefficient of friction of the planar sliding plate (44) is smaller than the coefficient of friction of the spherical sliding plate (45).
4. The variable friction long span continuous beam system according to claim 1, wherein:
the pier body (2) comprises a fixed pier (21) and movable piers (22) arranged on two sides of the fixed pier (21) along the longitudinal bridge direction, and the friction-variable support (4) is arranged at the top of the movable pier (22);
the top of the fixed pier (21) is provided with a one-way movable friction pendulum support (7) and a fixed friction pendulum support (8) for fixing the beam body (1).
5. The variable friction long span continuous beam system according to claim 4, wherein:
under the normal operation load, the relative sliding surface of the beam body (1) and the movable pier (22) occurs on the plane sliding plate (44), and the friction coefficient of the plane sliding plate (44) is less than or equal to 0.03.
6. The variable friction long span continuous beam system according to claim 4, wherein:
under the action of rare earthquakes, the relative sliding surface of the beam body (1) and the movable pier (22) occurs on the spherical sliding plate (45), and the friction coefficient of the spherical sliding plate (45) is greater than 0.05.
7. The variable friction long span continuous beam system according to claim 1, wherein:
a spherical crown lining plate (48) is clamped between the middle seat plate (42) and the lower seat plate (43), and the upper surface and the lower surface of the spherical crown lining plate (48) are both convex spherical surfaces.
8. The variable friction long span continuous beam system according to claim 1, wherein:
the first limiting block (46) is connected with a middle seat plate (42) of the unidirectional movable type friction-variable support (4 a) through a shear pin (5);
and the second limiting block (47) is connected with the middle seat plate (42) of the bidirectional movable type friction-variable support (4 b) through a shear pin (5).
Priority Applications (1)
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