阅读说明：本技术 一种具有减隔震功能的转体桥及其施工方法 (Swivel bridge with seismic isolation and reduction functions and construction method thereof ) 是由 柏华军 毕玉琢 严爱国 余兴胜 李波 柳鸣 汪晨露 闫俊锋 夏文俊 李沅璋 刘珺 于 2019-09-23 设计创作，主要内容包括：本发明提供了一种具有减隔震功能的转体桥,包括桩基、桥墩和梁体,桩基和桥墩之间设有上承台和下承台,上承台和下承台中心通过球铰连接,上承台和下承台之间设置有若干个减震结构件,该若干减震结构件位于球铰外侧,且绕球铰周向等间距布置,上承台底部沿其周向设置有若干撑脚,撑脚底部通过橡胶隔震支座与下承台可拆卸连接。该转体桥取消了传统的封胶混凝土施工,通过在传统转体桥撑脚下增加橡胶隔震支座,相当于桥梁结构与下承台之间形成隔震层,在大地震时,橡胶隔震支座可以抵消大量的地震能量,同时在上、下承台之间增加减震结构件,以大量消耗进入结构的地震能量,从而大幅度降低整个桥梁结构的地震响应,大大提高结构的抗震能力。(The invention provides a swivel bridge with shock absorption and isolation functions, which comprises a pile foundation, bridge piers and a beam body, wherein an upper bearing platform and a lower bearing platform are arranged between the pile foundation and the bridge piers, the centers of the upper bearing platform and the lower bearing platform are connected through a spherical hinge, a plurality of shock absorption structural members are arranged between the upper bearing platform and the lower bearing platform, the shock absorption structural members are positioned outside the spherical hinge and are arranged at equal intervals in the circumferential direction around the spherical hinge, a plurality of supporting feet are arranged at the bottom of the upper bearing platform along the circumferential direction, and the bottoms of the supporting feet are detachably connected with the lower bearing platform through rubber shock isolation supporting seats. This swivel bridge has cancelled traditional glue concrete construction that seals, through increase rubber shock insulation support under traditional swivel bridge arm brace, forms the shock insulation layer between bridge construction and the lower cushion cap in other words, and when the earthquake, a large amount of seismic energy can be offset by rubber shock insulation support, increases shock-absorbing structure spare simultaneously between upper and lower cushion cap to a large amount of seismic energy that consume gets into the structure, thereby reduce the seismic response of whole bridge construction by a wide margin, improve the shock resistance of structure greatly.)

1. The utility model provides a swivel bridge with subtract shock insulation function, includes pile foundation, pier and the roof beam body that sets gradually by supreme down, its characterized in that: be provided with cushion cap and lower cushion cap between pile foundation and the pier, go up the cushion cap and pass through the ball pivot with lower cushion cap center and connect, go up and be provided with a plurality of shock-absorbing structure spare between cushion cap and the lower cushion cap, this a plurality of shock-absorbing structure spare is located the ball pivot outside, and arranges around ball pivot circumference equidistant, it is provided with a plurality of chaplets to go up cushion cap bottom along its circumference, the chaplet bottom through rubber shock insulation support with the connection can be dismantled to the lower cushion cap.

2. The swivel bridge with seismic isolation and reduction functions as claimed in claim 1, wherein: the top of the lower bearing platform is of a groove structure, and the upper bearing platform is arranged in a groove of the lower bearing platform.

3. The swivel bridge with seismic isolation and reduction functions as claimed in claim 2, wherein: the side edge of the lower bearing platform is sealed with the side edge of the upper bearing platform through a concrete block.

4. The swivel bridge with seismic isolation and reduction functions as claimed in claim 2, wherein: and a plurality of buffer rubber blocks which are symmetrically arranged at intervals are arranged between the side edge of the lower bearing platform and the side edge of the upper bearing platform.

5. the swivel bridge with seismic isolation and reduction functions as claimed in claim 2, wherein: and a drainage pipeline for draining accumulated water in the groove of the lower bearing platform is pre-buried on the lower bearing platform.

6. The swivel bridge with seismic isolation and reduction functions as claimed in claim 1, wherein: the spherical hinge comprises a spherical hinge concave spherical lower disc, a spherical hinge convex spherical upper disc and a central pin shaft, a smooth sliding surface is formed between the spherical hinge concave spherical lower disc and the spherical hinge convex spherical upper disc, rotating shaft sleeves are arranged at the central holes of the spherical hinge concave spherical lower disc and the spherical hinge convex spherical upper disc, and the central pin shaft is detachably connected in the two rotating shaft sleeves.

7. The swivel bridge with seismic isolation and reduction functions as claimed in claim 1, wherein: shock-absorbing structure spare is viscous shock attenuation attenuator, symmetrical arrangement has pre-buried screw-thread steel stick on last cushion cap and the lower cushion cap, viscous shock attenuation attenuator is the cross symmetrical arrangement and is gone up between cushion cap and the lower cushion cap, and viscous shock attenuation attenuator's both ends nut respectively with last cushion cap and the pre-buried screw-thread steel stick fixed connection on the cushion cap down.

8. The swivel bridge with seismic isolation and reduction functions as claimed in claim 1, wherein: rubber shock insulation support is including from top to bottom fixed connection's under support upper junction plate, support main part and the support connecting plate in proper order, in the arm-brace upper end part stretches into the cushion cap, with upper cushion cap fixed connection, the arm-brace stretches out upper cushion cap part through the arm-brace connecting plate with the connection can be dismantled to support upper junction plate, the pre-buried sleeve has been arranged on the cushion cap down, under the support the connecting plate pass through the bolt with the pre-buried sleeve fixed connection of cushion cap down.

9. The swivel bridge with seismic isolation and reduction functions as claimed in claim 1, wherein: the bridge is characterized by further comprising bridge side piers arranged at the bottoms of the two ends of the beam body, and a connecting positioning piece used for limiting the horizontal displacement of the beam body is arranged between the bridge side piers and the beam body.

10. A construction method of a swivel bridge with seismic isolation and reduction functions is characterized by comprising the following steps:

1) the construction method comprises the following steps that pile foundation and lower bearing platform construction is carried out on two sides of an existing railway, and a spherical hinge is installed in the center of the top surface of the lower bearing platform, wherein the spherical hinge comprises a spherical hinge concave spherical lower disc, a spherical hinge convex spherical upper disc and a central pin shaft;

2) constructing an upper bearing platform above the spherical hinge convex spherical surface upper disc, embedding the spherical hinge convex spherical surface upper disc in the center of the bottom surface of the upper bearing platform, embedding a supporting foot in the bottom surface of the upper bearing platform, wherein the supporting foot comprises an upper supporting foot section, a lower supporting foot section, a supporting foot connecting plate and a supporting foot walking plate;

3) after the rotating body is in place, the lower section of the supporting foot is detached, the lower section of the supporting foot is replaced by a rubber shock insulation support, the upper end of the rubber shock insulation support is detachably connected with the upper section of the supporting foot, and the lower end of the rubber shock insulation support is fixed with a lower bearing platform;

4) Removing the central pin shaft on the spherical hinge, and removing the central limit between the upper bearing platform and the lower bearing platform;

5) Installing damping structural members in a vertical gap between the lower bearing platform and the upper bearing platform, wherein the damping structural members are symmetrically arranged around the circumferential direction of the spherical hinge;

6) Installing buffer rubber blocks in a horizontal gap between the lower bearing platform and the upper bearing platform, wherein the buffer rubber blocks are arranged at equal intervals around the circumference of the upper bearing platform;

7) Pouring concrete blocks with certain thickness on the top surfaces of the upper bearing platform and the lower bearing platform so as to seal a gap between the upper bearing platform and the lower bearing platform;

8) and (5) installing conventional swivel bridge auxiliary equipment to finish construction.

Technical Field

the invention belongs to the technical field of bridge engineering, and particularly relates to a swivel bridge with seismic isolation and reduction functions and a construction method thereof.

Background

the bridge structure plays an important role in the aspects of national economic development, promotion of cultural communication, strengthening of national defense and the like; especially, emergency recourse is implemented during earthquake, production is recovered after the disaster, and the smoothness of the life trunk line is ensured to occupy an important position, so the importance of the bridge structure earthquake resistance is particularly important.

with the implementation of the eight-vertical eight-horizontal road network of the high-speed railway in China, the construction of the high-speed road and the municipal engineering road network can not be crossed with the railway road network, and the high-speed railway needs to be crossed by bridge engineering to form the three-dimensional crossing. In the bridge construction, the traditional bridge construction method is as follows: the cradle construction method, the support cast-in-place method, the pushing construction method and the like need to be carried out above the high-speed railway, and any small construction sundries fall onto a train running at high speed in the construction process, so that serious safety accidents can be caused. Therefore, in order to ensure that bridge construction interferes with the existing high-speed railway, almost all bridges across the existing high-speed railway adopt a swivel construction method, and the principle is that the bridge is firstly constructed outside a safety affected area of the high-speed railway and then quickly swiveled to the position above the railway for folding. The bridge adopting swivel construction is a swivel bridge, and is a bridge with a special structure, compared with a conventional bridge, a rotating system is additionally arranged, the rotating system is generally arranged in a bearing platform area, the bearing platform is divided into an upper bearing platform and a lower bearing platform, a swivel ball hinge, a supporting foot and the like are arranged between the two bearing platforms, and a traction cable wound on the upper bearing platform is drawn by a jack, so that the upper bearing platform rotates by taking the ball hinge as a fulcrum, and the rotation on the horizontal plane of the bridge is realized.

the existing seismic isolation and reduction method adopted by the large-span continuous beam bridge is to arrange a damping support 4 at the top of a main pier of the bridge and arrange a damper between pier beams for seismic isolation and reduction, as shown in figure 1. However, such measures are firstly complicated to construct, particularly, after an earthquake, the bridge structure generally needs to be corrected to restore the bridge structure to the original position, the correction construction is troublesome, and sometimes, the steel bars of the middle piers are added to perform hard resistance, so that the construction cost is high. The mode of shock absorption and isolation at the bottom of main piers such as a continuous beam and the like is well documented, particularly for a swivel construction bridge, at present, no case exists for shock absorption and isolation by means of a special structure of a swivel bridge rotating system, and after a swivel is accurately positioned in a swivel, a gap between a supporting foot and a ring channel can be plugged and firmly welded by a steel wedge, and meanwhile, a steel bar and a steel bar embedded on an upper bearing platform and a lower bearing platform are welded and filled with concrete, and a swivel hinge is fixedly connected to form an integral bearing platform.

Disclosure of Invention

The invention aims to solve the problems that in the prior art, a swivel bridge structure is poor in anti-seismic capacity and a seismic isolation structure is complex to construct.

the invention provides a swivel bridge with shock absorption and isolation functions, which comprises a pile foundation, a pier and a beam body which are sequentially arranged from bottom to top, wherein an upper bearing platform and a lower bearing platform are arranged between the pile foundation and the pier, the centers of the upper bearing platform and the lower bearing platform are connected through a spherical hinge, a plurality of shock absorption structural members are arranged between the upper bearing platform and the lower bearing platform, the shock absorption structural members are positioned outside the spherical hinge and are arranged at equal intervals in the circumferential direction around the spherical hinge, the bottom of the upper bearing platform is provided with a plurality of supporting feet along the circumferential direction, and the bottoms of the supporting feet are detachably connected with the lower bearing platform through rubber shock isolation supporting seats.

Furthermore, the top of the lower bearing platform is of a groove structure, and the upper bearing platform is arranged in a groove of the lower bearing platform.

Furthermore, the side edge of the lower bearing platform is sealed with the side edge of the upper bearing platform through a concrete block.

Furthermore, a plurality of buffer rubber blocks which are symmetrically arranged at intervals are arranged between the side edge of the lower bearing platform and the side edge of the upper bearing platform.

Furthermore, a drainage pipeline for draining accumulated water in the groove of the lower bearing platform is pre-buried on the lower bearing platform.

Further, the spherical hinge comprises a spherical hinge concave spherical lower disc, a spherical hinge convex spherical upper disc and a central pin shaft, a smooth sliding surface is formed between the spherical hinge concave spherical lower disc and the spherical hinge convex spherical upper disc, rotating shaft sleeves are arranged at the central holes of the spherical hinge concave spherical lower disc and the spherical hinge convex spherical upper disc, and the central pin shaft is detachably connected in the two rotating shaft sleeves.

Further, shock-absorbing structure spare is viscous shock attenuation attenuator, symmetrical arrangement has pre-buried screw-thread steel bar on going up cushion cap and the cushion cap down, viscous shock attenuation attenuator is the fork symmetrical arrangement and is gone up between cushion cap and the cushion cap down, and viscous shock attenuation attenuator's both ends nut respectively with last cushion cap and the pre-buried screw-thread steel bar fixed connection on the cushion cap down.

Further, rubber shock insulation support is including from top to bottom fixed connection's under support upper junction plate, support main part and the support connecting plate in proper order, arm brace upper end part stretch into in the cushion cap, with last cushion cap fixed connection, the arm brace stretch out the cushion cap part through arm brace connecting plate with the connection can be dismantled to support upper junction plate, arranged pre-buried sleeve on the cushion cap down, under the support connecting plate pass through the bolt with the pre-buried sleeve fixed connection of cushion cap down.

Furthermore, the swivel bridge with seismic isolation and reduction functions further comprises side piers arranged at the bottoms of the two ends of the beam body, and a connecting and positioning piece used for limiting the horizontal displacement of the beam body is arranged between the side piers and the beam body.

In addition, the invention also provides a construction method of the swivel bridge with the seismic isolation and reduction function, which comprises the following steps:

1) the construction method comprises the following steps that pile foundation and lower bearing platform construction is carried out on two sides of an existing railway, and a spherical hinge is installed in the center of the top surface of the lower bearing platform, wherein the spherical hinge comprises a spherical hinge concave spherical lower disc, a spherical hinge convex spherical upper disc and a central pin shaft;

2) Constructing an upper bearing platform above the spherical hinge convex spherical surface upper disc, embedding the spherical hinge convex spherical surface upper disc in the center of the bottom surface of the upper bearing platform, embedding a supporting foot in the bottom surface of the upper bearing platform, wherein the supporting foot comprises an upper supporting foot section, a lower supporting foot section, a supporting foot connecting plate and a supporting foot walking plate;

3) After the rotating body is in place, the lower section of the supporting foot is detached, the lower section of the supporting foot is replaced by a rubber shock insulation support, the upper end of the rubber shock insulation support is detachably connected with the upper section of the supporting foot, and the lower end of the rubber shock insulation support is fixed with a lower bearing platform;

4) removing the central pin shaft on the spherical hinge, and removing the central limit between the upper bearing platform and the lower bearing platform;

5) Installing damping structural members in a vertical gap between the lower bearing platform and the upper bearing platform, wherein the damping structural members are symmetrically arranged around the circumferential direction of the spherical hinge;

6) Installing buffer rubber blocks in a horizontal gap between the lower bearing platform and the upper bearing platform, wherein the buffer rubber blocks are arranged at equal intervals around the circumference of the upper bearing platform;

7) pouring concrete blocks with certain thickness on the top surfaces of the upper bearing platform and the lower bearing platform so as to seal a gap between the upper bearing platform and the lower bearing platform;

8) and (5) installing conventional swivel bridge auxiliary equipment to finish construction.

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

(1) The swivel bridge with the shock absorption and isolation functions provided by the invention utilizes the special structure of a swivel bridge rotating system, the traditional construction of sealing glue concrete is cancelled, a rubber shock isolation support is additionally arranged below a traditional swivel bridge supporting foot, namely a shock isolation layer is formed between a bridge structure and a lower bearing platform, when a large earthquake occurs, the rubber shock isolation support can offset a large amount of earthquake energy, and meanwhile, a shock absorption structural member is additionally arranged between the upper bearing platform and the lower bearing platform to consume a large amount of earthquake energy entering the structure, so that the earthquake response of the whole bridge structure is greatly reduced, and the earthquake resistance of the structure is greatly improved.

(2) According to the swivel bridge with the seismic isolation and reduction functions, the central pin shaft of the spherical hinge is designed into a detachable structure, and after the swivel is completed, the central pin shaft can be taken out, so that the lower spherical surface disc of the spherical hinge and the upper spherical surface disc of the spherical hinge can move horizontally relatively in an earthquake, and therefore the bridge structure can be automatically reset and centered by the spherical hinge due to displacement under the action of the earthquake, and the swivel bridge has an automatic deviation rectifying function.

(3) The swivel bridge with the seismic isolation and reduction functions can greatly reduce the seismic response of the whole bridge structure only by adding the rubber seismic isolation support and the shock absorption structural member, is installed on the ground, is convenient to construct, maintain and maintain, requires less additional investment for improving the seismic capacity, is low in cost, is convenient to construct, and has strong market competitiveness.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural view of a conventional shock-absorbing bridge;

FIG. 2 is a schematic structural diagram of the swivel bridge with seismic isolation and reduction functions according to the present invention;

FIG. 3 is a schematic structural view of the ball joint according to the present invention;

FIG. 4 is a schematic view of the temple according to the present invention;

FIG. 5 is a schematic structural view of a rubber-vibration-isolating support in the present invention;

FIG. 6 is a schematic view of the connection and installation of the rubber vibration-isolating support and the arm brace in the present invention;

FIG. 7 is a schematic view of the installation of the shock absorbing structure of the present invention;

Fig. 8 is a schematic diagram of a full bridge elevational structure of the swivel bridge of the present invention.

Description of reference numerals: 1. a pile foundation; 2. a bridge pier; 3. a beam body; 4. a shock-absorbing support; 5. a lower bearing platform; 6. a buffer rubber block; 7. a concrete block; 8. an upper bearing platform; 9. spherical hinge; 10. a shock-absorbing structural member; 11. a brace; 12. a rubber shock insulation support; 13. a water discharge pipeline; 14. a spherical hinge concave spherical surface lower disc; 15. a spherical hinge convex spherical surface upper disc; 16. a rotating shaft sleeve; 17. a center pin; 18. positioning angle steel; 19. an upper section of the arm brace; 20. a brace connecting plate; 21. a lower leg support section; 22. a step of walking plate of arm brace; 23. the support is connected with a plate; 24. a support body; 25. a lower connecting plate of the support; 26. pre-burying a sleeve; 27. pre-embedding a deformed steel bar; 28. and connecting the positioning piece.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention; in the description of the present invention, the meaning of "plurality" or "a plurality" is two or more unless otherwise specified.

As shown in fig. 2, this embodiment provides a swivel bridge with subtract shock insulation function, include by lower supreme pile foundation 1, pier 2 and the roof beam body 3 that sets gradually, be provided with cushion cap 8 and lower cushion cap 5 between pile foundation 1 and the pier 2, go up cushion cap 8 and lower cushion cap 5 center and pass through ball pivot 9 and connect, go up cushion cap 8 and be provided with a plurality of shock-absorbing structure spare 10 down between the cushion cap 5, this a plurality of shock-absorbing structure spare 10 are located the ball pivot 9 outside, and around the equidistant arrangement of ball pivot 9 circumference, it is provided with a plurality of daggers 11 to go up cushion cap 8 bottom along its circumference, dagger 11 bottom through rubber shock insulation support 12 with the connection can be dismantled to lower cushion cap 5. In the embodiment, after the bridge rotation construction is finished, concrete sealing and hinging construction is not carried out, namely, the upper bearing platform 8 and the lower bearing platform 5 are not connected into a whole, a gap is reserved between the upper bearing platform 8 and the lower bearing platform 5 in the vertical direction, and a damping structural part 10 is arranged in the gap, so that in the normal use stage of the bridge, on one hand, the damping structural part 10 can work together with the supporting feet 11 and the spherical hinges 9 to support the bridge structure, and on the other hand, when an earthquake occurs, the damping structural part 10 can consume a large amount of earthquake energy entering the structure, so that the bridge structure is prevented from being damaged, and the aim of improving the earthquake resistance of the bridge structure is fulfilled; meanwhile, the rubber shock insulation support 12 is additionally arranged below the traditional swivel bridge supporting foot, namely a shock insulation layer is formed between the bridge structure and the lower bearing platform 5, and when a large earthquake occurs, the rubber shock insulation support 12 can offset a large amount of earthquake energy, so that the bridge structure further achieves the purpose of shock insulation.

In a refined implementation mode, the top of the lower bearing platform 5 is of a groove structure, the upper bearing platform 8 is installed in a groove of the lower bearing platform 5, in order to prevent rainwater, namely other impurities, from entering a gap between the upper bearing platform 8 and the lower bearing platform 5, the side edge of the lower bearing platform 5 and the side edge of the upper bearing platform 8 are sealed through the concrete block 7, and meanwhile, the concrete block 7 can also play a role in restraining the plane direction of the bridge structure, so that the bridge structure is ensured not to generate horizontal displacement in a normal use stage. Further optimally, as shown in fig. 2, a plurality of buffer rubber blocks 6 which are symmetrically arranged at intervals are further arranged between the side edge of the lower bearing platform 5 and the side edge of the upper bearing platform 8, and the buffer rubber blocks 6 can be made into square blocks, so that the bridge structure has a certain buffer constraint effect in the horizontal direction when an earthquake occurs, the bridge structure is prevented from generating overlarge horizontal displacement, and the upper bearing platform 8 and the lower bearing platform 5 are prevented from being damaged by collision. In order to further ensure the durability of the bearing platform structure and prevent the accumulated water permeating into the groove of the lower bearing platform 5 from corroding steel structures such as a damping structure member 10, a swivel supporting foot 11 and the like, a drainage pipeline 13 for draining the accumulated water in the groove of the lower bearing platform 5 is pre-embedded in the lower bearing platform 5, and the upper bearing platform 8 and the lower bearing platform 5 are ensured to have no rainwater deposition.

As shown in fig. 3, the spherical hinge 9 includes a spherical hinge concave spherical lower disc 14, a spherical hinge convex spherical upper disc 15 and a central pin shaft 17, a smooth sliding surface is formed between the spherical hinge concave spherical lower disc 14 and the spherical hinge convex spherical upper disc 15, the central holes of the spherical hinge concave spherical lower disc 14 and the spherical hinge convex spherical upper disc 15 are both provided with a rotating shaft sleeve 16, the central pin shaft 17 is detachably connected in the two rotating shaft sleeves 16, the spherical hinge convex spherical upper disc 15 can drive the upper bearing platform 8 and the upper bridge structure thereof to rotate around the central pin shaft 17 with small power, so as to realize the rotation, and after the rotation is finished, unlike the conventional rotation bridge, the central pin shaft is left in the original position, in this embodiment, the central pin shaft 17 is taken out, so that the spherical hinge concave spherical lower disc 14 and the spherical hinge convex spherical upper disc 15 can relatively move horizontally during an earthquake, the spherical effect can automatically center, and has an automatic deviation rectification function, the bridge structure can automatically recover to the original position after the earthquake, and extra deviation rectifying measures are not needed. Further, in order to ensure that the spherical hinge concave spherical surface lower disc 14 is fixed, the spherical hinge concave spherical surface lower disc 14 and the rotating shaft sleeve 16 are fixed through a positioning angle steel 18, the hinge concave spherical surface lower disc 14 and the rotating shaft sleeve 16 form a triangular support, and the installation stability of the hinge concave spherical surface lower disc 14 is enhanced.

As shown in fig. 4, 5 and 6, the arm brace 11 includes an upper arm brace section 19, an lower arm brace section 21, an arm brace connecting plate 20 and an arm brace walking plate 22, the upper arm brace section 19 extends into the upper bearing platform 8 and is fixedly connected with the upper bearing platform 8, the bottom of the upper arm brace section 19 is detachably connected with the lower arm brace section 21 through the arm brace connecting plate 20, the bottom of the lower arm brace section 21 is connected with the arm brace walking plate 22, a certain distance is reserved between the arm brace walking plate 22 and the lower bearing platform 5, the arm brace walking plate 22 and the lower bearing platform 5 keep a distance of 20mm in the embodiment, so that the relative rotation between the upper bearing platform 8 and the lower bearing platform 5 can be ensured, and the arm brace 11 can timely fall to the ground when the beam body 3 is inclined, thereby playing a stabilizing role. The rubber shock insulation support 12 comprises a support upper connecting plate 23, a support main body 24 and a support lower connecting plate 25 which are sequentially and fixedly connected from top to bottom, the support upper connecting plate 23 and the support lower connecting plate 25 are solid connecting plates with bolt holes, after the rotation is finished, the supporting foot lower section 21 is detached and replaced by the rubber shock insulation support 12, the supporting foot upper section 19 is detachably connected with the support upper connecting plate 23 through the supporting foot connecting plate 20, the support upper connecting plate 23 is close to the supporting foot connecting plate 20 in shape and size and can be connected with the supporting foot upper section 19 through bolts and nuts to form a supporting foot-rubber shock insulation support combined structure, an embedded sleeve 26 is arranged on the lower bearing platform 5, the support lower connecting plate 25 is provided with bolt holes and can be fixedly connected with the embedded sleeve 26 of the lower bearing platform 5 through the bolts and the nuts.

As shown in fig. 7, the shock-absorbing structure 10 is a viscous shock-absorbing damper, the pre-embedded threaded steel rod 27 is symmetrically arranged on the upper bearing platform 8 and the lower bearing platform 5, the viscous shock-absorbing damper is symmetrically arranged between the upper bearing platform 8 and the lower bearing platform 5 in a crossed manner, nuts at two ends of the viscous shock-absorbing damper are fixedly connected with the pre-embedded threaded steel rod 27 on the upper bearing platform 8 and the lower bearing platform 5 respectively, and the high-strength pre-embedded threaded steel rod 27 for fixing the viscous shock-absorbing damper is required not to be cut off during an earthquake. The viscous damping damper arranged between the upper bearing platform and the lower bearing platform can generate large damping due to the relative lateral movement vibration of the upper bearing platform and the lower bearing platform during earthquake, and a large amount of earthquake energy entering the structure is consumed, so that the bridge structure achieves the purpose of shock absorption and isolation.

in this embodiment, pile foundation 1 is the same with the pile foundation of traditional bridge, divide into pier pile foundation and side pier pile foundation in, is used for supporting pier and bridge side pier in the bridge respectively. Pier 2 is the same with the pier of traditional bridge, divide into pier and bridge side mound in the bridge, supports girder segment 3 on its upper portion together, and the pier top sets up damping bearing 4 in the bridge that is different from traditional shock attenuation bridge, and pier and the fixed mode of girder segment 3 in the bridge are adopted to this embodiment, rotate cushion cap formation shock mitigation system through pier in the bridge bottom and reach the absorbing purpose. The beam body 3 is the same as that of a traditional bridge, and the beam body 3 can be a traditional continuous beam, a T-shaped beam, a bridge such as a continuous beam arch bridge and a short-tower cable-stayed bridge which can be used for swivel construction.

In addition, as shown in fig. 8, in order to avoid the beam falling caused by the relative horizontal displacement of the beam body during a major earthquake, a connecting positioning piece 28 for limiting the horizontal displacement of the beam body 3 is arranged between the bridge side piers arranged at the bottoms of the two ends of the beam body 3 and the beam body 3, the connecting positioning piece 28 not only allows the beam body 3 to have a certain displacement, but also can limit the displacement of the beam body 3, such as a steel chain or a liquid viscous damper, so as to ensure the free expansion and contraction in a normal operation state.

The construction method of the swivel bridge with seismic isolation and reduction functions in the embodiment comprises the following specific processes:

(1) the construction of the pile foundation 1 and the lower bearing platform 5 is carried out on two sides of the existing railway, the spherical hinge 9 is installed in the center of the top surface of the lower bearing platform 5, the drainage pipeline 13, the threaded steel bar and the embedded sleeve 26 are embedded in the lower bearing platform 5 in the construction process, and the installation of the buffer rubber block 6, the rubber shock insulation support 12 and the shock absorption structural part 10 is facilitated in the later period.

the spherical hinge 9 comprises a spherical hinge concave spherical lower disc 14, a spherical hinge convex spherical upper disc 15 and a central pin shaft 17, wherein the central holes of the spherical hinge concave spherical lower disc 14 and the spherical hinge convex spherical upper disc 15 are respectively provided with a rotating shaft sleeve 16, and the central pin shaft 17 is detachably connected in the two rotating shaft sleeves 16.

(2) concrete is poured above the spherical hinge convex spherical surface upper disc 15 to form an upper bearing platform 8, the spherical hinge convex spherical surface upper disc 15 is pre-embedded in the center of the bottom surface of the upper bearing platform 8, meanwhile, a supporting foot 11 is pre-embedded in the bottom surface of the upper bearing platform 8, the supporting foot 11 comprises an upper supporting foot section 19, a lower supporting foot section 21, a supporting foot connecting plate 20 and a supporting foot walking plate 22, the upper supporting foot section 19 extends into the upper bearing platform 8, the bottom of the upper supporting foot section 19 is detachably connected with the lower supporting foot section 21 through the supporting foot connecting plate 20, the bottom of the lower supporting foot section 21 is connected with the supporting foot walking plate 22, and a certain distance is reserved between the supporting foot walking plate 22 and the lower bearing platform 5.

(3) And constructing the pier 2 on the upper bearing platform 8, constructing the cantilever swivel part of the beam body 3 at the front position of the swivel, erecting a mould on the lower bearing platform 5, performing the second concrete pouring of the lower bearing platform 5, swiveling the beam body 3 around the spherical hinge 9, folding the bridge structure, and finishing the system conversion. Of course, before the body rotates, the beam body 3 needs to be subjected to weighing test and trial rotation.

(4) After the rotation body is in place, the lower supporting leg section 21 is detached, the lower supporting leg section 21 is replaced by the rubber shock-insulation support 12, the upper end of the rubber shock-insulation support 12 is detachably connected with the upper supporting leg section 19, and the lower end of the rubber shock-insulation support 12 is fixed with the lower bearing platform 5.

(5) and removing the central pin shaft 17 on the spherical hinge 9, and releasing the central limit between the upper bearing platform 8 and the lower bearing platform 5.

(6) The shock absorption structural parts 10 are arranged in the vertical gap between the lower bearing platform 5 and the upper bearing platform 8, the shock absorption structural parts 10 are symmetrically arranged around the circumference of the spherical hinge 9, and bolts and nuts connected with the shock absorption structural parts 10 are required to have enough strength, so that the shock absorption structural parts are not cut off in the earthquake.

(7) installing buffer rubber blocks 6 in a horizontal gap between the lower bearing platform 5 and the upper bearing platform 8, wherein the buffer rubber blocks 6 are arranged at equal intervals around the circumference of the upper bearing platform 8; the buffer rubber block 6 is used for buffering and absorbing the horizontal displacement of the upper bearing platform 8 during the earthquake, so that the collision damage to the upper bearing platform 8 can be prevented.

(8) concrete blocks 7 with certain thickness are poured on the top surfaces of the upper bearing platform 8 and the lower bearing platform 5 to seal the gap between the upper bearing platform 8 and the lower bearing platform 5, so that the fixing and the limiting of the bridge in a normal state are guaranteed, and rainwater and other sundries are reduced from entering the gap between the upper bearing platform and the lower bearing platform.

(9) and (5) installing conventional swivel bridge auxiliary equipment to finish construction.

In summary, the swivel bridge with shock absorption and isolation functions provided by the invention utilizes the special structure of the swivel bridge rotating system, the traditional construction of sealing glue concrete is cancelled, the rubber shock isolation support is additionally arranged below the traditional swivel bridge supporting foot, namely a shock isolation layer is formed between the bridge structure and the lower bearing platform, when a large earthquake occurs, the rubber shock isolation support can offset a large amount of earthquake energy, and meanwhile, the shock absorption structural part is additionally arranged between the upper bearing platform and the lower bearing platform, so that the earthquake energy entering the structure is greatly consumed, the earthquake response of the whole bridge structure is greatly reduced, and the earthquake resistance of the structure is greatly improved.

the above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.