Swivel device and construction method of truss type cantilever steel beam in swivel bridge

Abstract

The application discloses a swivel device and construction method of a truss type cantilever steel beam in a swivel bridge, which is composed of a plurality of truss type cantilever beams, a plurality of inner transverse connecting beams, a plurality of outer transverse connecting beams, upper spherical hinges, lower spherical hinges, supporting feet, slideways, sand cylinders, traction ropes, two counterforce supports and two jacks. The truss type cantilever beams are symmetrically arranged at equal angles around the sectional center of the pier, one end of the truss type cantilever beam is fixed to the lower part of the pier, the other end is connected with the supporting feet, the supporting feet fall on the slideways, the slideways are annular and are arranged at the center of the top of the lower bearing platform, the traction ropes are anchored to the pier, are wound on the outer side of the truss type cantilever beam, pass through the counterforce supports and the jacks, the upper spherical hinges are embedded in the bottom of the pier, and the lower spherical hinges are located at the center of the slideways. The swivel device and the construction method thereof have the advantages of eliminating the upper bearing platform of the swivel structure, realizing the recyclable utilization of the swivel device, facilitating the hinge sealing operation and reducing the engineering cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge, in particular to a swivel device and construction method of truss type cantilever steel beam in swivel bridge. BACKGROUND

[0002] Bridge swivel construction is to first construct half bridge on both sides of the obstacle to be crossed, and then to swivel the two half bridges to the bridge axis position by using the bridge structure as the swivel body and the swivel device. At present, this construction technology has been widely used in the construction of bridges in high mountains and gorges, the construction of overpass bridges crossing railway lines in cities and the like, and can realize rapid crossing of existing lines and effectively guarantee the normal operation of the line traffic during construction, and has good application prospect.

[0003] In order to prevent the bridge from overturning during swiveling, a large amount of upper bearing platform is often made to form reliable lateral support with the support leg. In addition, from the perspective of reducing the traction force, the large amount of upper bearing platform is also beneficial to expand the radius of the swivel disc to achieve the purpose of reducing the traction force. However, the upper bearing platform cannot be recycled, the gap between the upper bearing platform and the lower bearing platform is small, the operation surface for hinge sealing construction is limited, the post-poured concrete is not dense, the vertical steel bar is difficult to arrange, and due to the construction requirement that the bearing platform cannot be exposed to the ground, the addition of the upper bearing platform undoubtedly increases the depth of the foundation pit, and the cost of the swivel bridge is increased.

[0004] Therefore, it is necessary to provide a new type of fabricated bridge swivel support device, which can not only eliminate the upper bearing platform and realize the recyclability of the swivel support device, but also provide sufficient action surface for hinge sealing construction, so as to improve the reliable consolidation of the pier and the bearing platform. SUMMARY

[0005] The purpose of the present application is to solve the problems mentioned in the background art, and to provide a swivel device and construction method of truss type cantilever steel beam in swivel bridge.

[0006] To solve the above technical problems, the technical scheme provided by the present application is as follows: a swivel device of truss type cantilever steel beam in swivel bridge, the swivel device is composed of a plurality of truss type cantilever beams, a plurality of inner transverse connecting beams, a plurality of outer transverse connecting beams, an upper spherical hinge, a lower spherical hinge, a support leg, a slide, a sand cylinder, a traction cable, two counterforce seats and two jacks.

[0007] The truss cantilever beam is arranged at equal angles around the centroid of the pier section, one end of the truss cantilever beam is fixed to the lower part of the pier, the other end is connected to the support foot, the support foot falls on the slide, the slide is annular and is arranged at the center of the top of the lower bearing platform, the traction cable is anchored to the pier, wound on the outer side of the truss cantilever beam, passes through the counterforce support and the jack, the upper spherical hinge is embedded in the bottom of the pier, and the lower spherical hinge is located at the center of the slide.

[0008] As a preferred solution, a plurality of embedded parts are arranged around the outside of the lower part of the pier, the arrangement position of the embedded parts matches the arrangement mode of the truss cantilever beam, the embedded parts are used for connecting the truss cantilever beam and the pier through high-strength bolts, and the high-strength bolt connection can realize a horizontal arbitrary rotation angle of 0-180°.

[0009] As a preferred solution, the embedded parts are arranged in a structure with local reinforcement at the lower part of the pier, the structure matches the torque of the rotating body device, the height of the truss cantilever beam is equal or increases from outside to inside, the number of the truss cantilever beams is the same as the number of the support feet, the support feet are connected through high-strength bolts in the height direction, the inner and outer transverse connecting beams are connected through high-strength bolts in the transverse direction to form a rotating disc, the support feet are connected through high-strength bolts in the transverse direction to the outer transverse connecting beam, a groove is arranged on the outer side of the outer transverse connecting beam, and the groove is used for limiting the traction cable, and a steel sheet is arranged at the high-strength bolt connection position for adjusting the height or length error.

[0010] As a preferred solution, the inner transverse connecting beam is composed of a plurality of sub-connecting beams, a plurality of holes are arranged in the axial direction of each sub-connecting beam, a pin shaft passes through the holes to realize splicing of the sub-connecting beams, the length of the inner transverse connecting beam is consistent with the transverse spacing of the truss cantilever beam, and the length of the inner transverse connecting beam is adjusted by changing the hole position of the pin shaft.

[0011] As a preferred solution, the truss cantilever beam is composed of a plurality of truss units, the truss units are provided with a plurality of holes, and adjacent truss units are spliced by a pin shaft passing through the holes.

[0012] As a preferred solution, the truss unit can be divided into an outer truss unit, a standard truss unit and an inner truss unit, and is composed of a top chord, a bottom chord and a web, the cross-sectional form of the top chord, the bottom chord and the web can be circular, rectangular or I-shaped steel, and the cross-sectional material can be steel or steel pipe concrete.

[0013] As a preferred solution, the length of the truss cantilever beam matches the radius of the slide, the length of the truss cantilever beam is adjusted by increasing or reducing the number of standard truss units and changing the hole position of the pin shaft between the truss units.

[0014] As a preferred solution, the pin shaft diameter is slightly smaller than the hole diameter, the pin shaft is provided with threads, the thread length exceeds the hole, and the pin shaft is prevented from falling off by configuring a gasket and a nut.

[0015] As a preferred solution, the lower bearing platform longitudinal steel or prestressed tendon extends above the top surface for realizing the vertical reliable connection between the post-cast platform and the lower bearing platform after the bridge rotation is in place.

[0016] A construction method of a rotation device of a truss type cantilever steel beam in a rotation bridge, specifically comprising the following steps:

[0017] (1) Lower bearing platform construction, lower spherical hinge, and slide installation: The lower bearing platform is poured in two times. After the first poured concrete reaches the specified strength, the working area of the lower spherical hinge and the slide is cleaned, the quality of the required installation components is checked, the support steel frame of the lower spherical hinge and the slide is installed according to the design position, the lower spherical hinge and the slide are placed, the positioning is checked and adjusted, the verticality and the levelness are adjusted, the lower bearing platform steel reinforcement is bound, the second concrete pouring and curing are completed;

[0018] (2) Upper spherical hinge installation: The lower spherical hinge sundries are cleaned, then the teflon slide block is laid, butter is applied for lubrication, the upper spherical hinge is hoisted, the levelness and the verticality are checked, the gap between the upper and lower spherical hinges is closed using materials such as adhesive tape to prevent sundries from entering the inside of the gap between the upper and lower spherical hinges;

[0019] (3) First time construction of the bridge pier or tower: The sand cylinder is placed at the design position, the upper spherical hinge is fixed through the temporary support, the lower area steel reinforcement of the bridge pier is bound, the embedded part is installed according to the design position, the lower area formwork of the bridge pier is erected, the position of the embedded part is checked, the lower area concrete of the bridge pier is poured and cured, after the lower area concrete of the bridge pier reaches the strength requirement, the bridge pier formwork and the support are removed;

[0020] (4) Support leg and outer transverse beam assembly: The support leg is placed on the slide according to the specified position, the outer transverse beam is hoisted and positioned in turn in a counterclockwise or clockwise direction, and then the high-strength bolt connection between the support leg and the outer transverse beam is performed;

[0021] (5) Truss type cantilever beam splicing and connection with the bridge pier: The temporary support is placed, the outer truss unit, the standard truss unit, and the inner truss unit are hoisted in turn, the high-strength bolt connection between the outer truss unit and the support leg and between the inner truss unit and the lower embedded part of the bridge pier is fixed, the appropriate hole is selected according to the reserved length, the pin shaft is inserted, the splicing of the inner truss unit with the inner and outer truss units is completed, and the truss type cantilever beam is formed;

[0022] (6) Second time construction of the bridge pier: The sand cylinder is placed at the slide position, the lower steel reinforcement of the bridge pier is lengthened, the middle and upper steel reinforcement of the bridge pier is bound, the middle and upper formwork of the bridge pier is erected, the stability of the temporary support is checked, and then the middle and upper concrete of the bridge pier is poured and cured;

[0023] (7) Main beam construction: the main beam construction is completed through the cantilever pouring or cantilever assembly or support construction method;

[0024] (8) Traction cable installation: the traction cable is drawn out and wound outside the truss cantilever beam, and the other end is inserted into the jack in the counterforce seat;

[0025] (9) Preparation work before rotation: the bolt connection condition of the truss unit is checked again before rotation, the height difference between the support foot bottom and the slide is adjusted, the rotation bridge is weighed and tested, and the eccentric position is adjusted;

[0026] (10) Rotation: the bridge is removed from the temporary fixing, the traction cable is slowly tensioned, the rotation speed and angle are strictly controlled, the horizontal condition of the rotation bridge is observed in real time, and whether a larger gap appears between the support foot and the slide is also observed, if a larger eccentricity appears, the reason is found out and timely adjusted;

[0027] (11) Main beam wet joint pouring: after the bridge is horizontally rotated to the predetermined position, the main beam wet joint concrete pouring and maintenance are carried out;

[0028] (12) Abutment concrete pouring: the truss cantilever beam, the outer transverse coupling beam, the inner transverse coupling beam and the support foot are removed and recycled, the abutment steel bars and the communication steel bars reserved in the lower bearing platform are welded, the transverse steel bars are arranged, the abutment steel bars are bound, the abutment formwork is erected, the abutment concrete pouring and maintenance are carried out, and the hinge closing is completed.

[0029] Compared with the prior art, the beneficial effects of the present application are:

[0030] (1) The setting of the upper bearing platform is eliminated, the amount of bearing platform concrete is saved, the bearing platform height is reduced, the foundation pit excavation depth is reduced, and the engineering cost is lower.

[0031] (2) The assembly type support device is adopted, the construction efficiency is high, the recycling of the support device can be realized, and the green environmental protection performance is high.

[0032] (3) The truss cantilever beam rotation device is standardized designed according to different rotation tonnage, the length of the truss cantilever beam and the transverse coupling beam is adjustable, is suitable for various bridge pier section sizes, and has good universality. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is the overall schematic view of the rotation device of the present application.

[0034] Figure 2 is the abutment type connection schematic view after the rotation device of the present application is removed.

[0035] Figure 3 is the rotation support rotation schematic view of the truss cantilever beam rotation device of the present application.

[0036] Figure 4Is the truss cantilever beam schematic diagram of the present application.

[0037] Figure 5 Is the inner transverse beam schematic diagram of the present application.

[0038] Figure 6 Is the outer transverse beam and support foot connection schematic diagram of the present application.

[0039] As shown in the figure: 1 - truss cantilever beam; 2 - inner transverse beam; 3 - outer transverse beam; 4 - upper spherical hinge; 5 - lower spherical hinge; 6 - support foot; 7 - slide; 8 - sand cylinder; 9 - traction cable; 10 - counterforce seat; 11 - jack; 12 - pier; 13 - lower bearing platform; 14 - embedded part; 15 - pin shaft; 16 - lower bearing platform longitudinal reinforcement; 17 - prestressed tendon; 18 - main beam; 19 - pedestal concrete; 20 - pedestal longitudinal reinforcement; 1-1 - outer truss unit; 1-2 - standard truss unit; 1-3 - inner truss unit. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0041] In the description of the embodiments of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0042] In addition, if the terms "horizontal", "vertical", "overhanging" and the like appear, they do not mean that the component must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0043] In the description of the embodiments of the present application, "a plurality of" represents at least 2.

[0044] In the description of the embodiments of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, if the terms "arrange", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In combination with the drawings, a swivel device of a truss type cantilever steel beam in a swivel bridge, the swivel device is composed of a plurality of truss type cantilever beams 1, a plurality of inner transverse connecting beams 2, a plurality of outer transverse connecting beams 3, an upper spherical hinge 4, a lower spherical hinge 5, a support leg 6, a slide 7, a sand cylinder 8, a traction cable 9, two counterforce supports 10 and two jacks 11;

[0046] The truss type cantilever beam is arranged every 22.5°, 30°, 45° or 60° around the cross-sectional center of the pier section, one end of the truss type cantilever beam 1 is fixed to the lower part of the pier 12, the other end is connected to the support leg 6, the support leg 6 falls on the slide 7, the slide 7 is annular and is arranged at the top center of the lower bearing platform 13, the traction cable 9 is anchored to the pier 12, wound outside the truss type cantilever beam 1, passes through the counterforce support 10 and the jack 11, the upper spherical hinge 4 is embedded in the bottom of the pier 12, and the lower spherical hinge 5 is located at the center of the slide 7.

[0047] Further, polytetrafluoroethylene sliding sheet and butter are arranged between the upper spherical hinge 4 and the lower spherical hinge 5, and low-friction coefficient material is arranged between the support leg 6 and the slide 7.

[0048] Further, the jack 11 applies equal and opposite forces to the traction cable 9 through the counterforce support 10 to form a torque, and pulls the truss type cantilever beam 1 to form a rotating disc to rotate.

[0049] Further, the support leg 6 is composed of a single steel pipe or double steel pipes, the double steel pipes are connected by two flat steel plates, and the steel pipe is filled with expanded concrete or vertical stiffening ribs are arranged in the pipe.

[0050] Further, a plurality of embedded parts 14 are arranged around the outside of the lower part of the pier, the embedded parts 14 are arranged at positions matched with the arrangement mode of the truss type cantilever beam 1, the embedded parts 14 are used for high-strength bolt connection of the truss type cantilever beam 1 and the pier 12, and the high-strength bolt connection can realize a horizontal arbitrary rotation angle of 0-180°.

[0051] Further, the embedded part 14 is located at the lower part of the pier 8 and is provided with a locally reinforced structure which matches the torque of the rotating body device.

[0052] Further, the height of the truss cantilever beam 1 is equal or increasing from outside to inside, and the number of the truss cantilever beam 1 is the same as the number of the support legs 6. The high-strength bolts are used to connect the support legs 6 in the height direction, and the high-strength bolts are used to connect the inner transverse connecting beam 2 and the outer transverse connecting beam 3 in the lateral direction, thereby forming a rotating disc.

[0053] Further, the support legs 6 are connected by high-strength bolts in the lateral direction, and the outer transverse connecting beam 6 is provided with a groove on the outer side, and the groove is used to limit the traction cable 9.

[0054] Further, the high-strength bolt connection is padded with a steel sheet for adjusting the height or length error.

[0055] Further, a plurality of sand cylinders 8 are arranged directly below the outer transverse connecting beam 3 to prevent the bridge structure from overturning. The sand cylinders 8 are arranged between the support legs 6, symmetrically arranged at equal angles around the centroid of the pier cross section, and the number of the sand cylinders 8 is in a multiple relationship with the number of the support legs 6.

[0056] Further, the inner transverse connecting beam 2 is composed of a plurality of sub-connecting beams, each sub-connecting beam is axially provided with a plurality of holes, and the pin shaft passes through the holes to realize the splicing of each sub-connecting beam.

[0057] Further, the length of the inner transverse connecting beam 2 is consistent with the lateral spacing of the truss cantilever beam 1, and the length adjustment of the inner transverse connecting beam is realized by changing the hole position of the pin shaft 15 inserted.

[0058] Further, the truss cantilever beam 1 is composed of a plurality of truss units, the truss unit is provided with a plurality of holes, and the adjacent truss units are spliced by the pin shaft 15 passing through the holes.

[0059] Further, the truss unit can be divided into an outer truss unit 1-1, a standard truss unit 1-2 and an inner truss unit 1-3, which are composed of top chord, bottom chord and web. The cross-sectional form of the top chord, bottom chord and web can be circular, rectangular or I-beam, and the cross-sectional material can be steel or steel pipe concrete.

[0060] Further, the length of the truss cantilever beam 1 matches the radius of the slide 7, and the length adjustment of the truss cantilever beam 1 is realized by increasing or decreasing the number of standard truss units and changing the hole position of the pin shaft 15 inserted between the truss units.

[0061] Further, the diameter of the pin shaft 15 is slightly smaller than the diameter of the hole, the pin shaft 15 is provided with threads, the length of the threads exceeds the hole, and the pin shaft 15 is prevented from falling off by configuring a gasket and a nut.

[0062] Further, the lower bearing platform longitudinal reinforcement 16 or prestressed reinforcement 17 extends out of the top surface, used for realizing the post-poured platform and the vertical reinforcement connection of the lower bearing platform after the bridge rotation in place.

[0063] The present application is specifically implemented according to the following construction steps:

[0064] Lower bearing platform 13 construction, lower spherical hinge 5 and slide 7 installation: the lower bearing platform 13 is poured twice, after the first pouring of concrete reaches the specified strength, the working area of the lower spherical hinge 5 and the slide 7 is cleaned, the quality of the required installation components is checked, the support steel frame of the lower spherical hinge 5 and the slide 7 is installed according to the design position, the lower spherical hinge 5 and the slide are placed, the positioning is checked, the verticality and the levelness are adjusted, the lower bearing platform 13 reinforcement is bound, the second concrete pouring and maintenance are completed;

[0065] Upper spherical hinge 4 installation: cleaning the lower spherical hinge sundries, then laying the teflon slide block, smearing butter lubrication, hoisting the upper spherical hinge, checking the levelness and the verticality, using materials such as adhesive tape to seal the gap between the upper and lower spherical hinges to prevent sundries from entering the inside of the gap;

[0066] Bridge pier 12 first construction: placing the sand cylinder 8 at the designed position, fixing the upper spherical hinge 4 through the temporary support, binding the steel reinforcement in the lower region of the bridge pier 12, installing the embedded part 14 according to the design position, erecting the formwork of the lower region of the bridge pier 12, checking the position of the embedded part 14, pouring and maintaining the concrete in the lower region of the bridge pier 12, after the concrete in the lower region of the bridge pier 12 reaches the strength requirement, removing the formwork and support of the bridge pier 12;

[0067] Support leg 6 and outer transverse beam 3 assembly: placing the support leg 6 on the slide 7 according to the specified position, hoisting and positioning the outer transverse beam 3 in turn in a counterclockwise or clockwise direction, and then connecting the support leg 6 and the outer transverse beam 3 through high-strength bolts;

[0068] Truss type cantilever beam 1 splicing and connection with bridge pier 12: placing temporary support, hoisting the outer truss unit 1-1, standard truss unit 1-2 and inner truss unit 1-3 in turn, connecting and fixing the outer truss unit 1-1 and the support leg 6, and the inner truss unit 1-3 and the embedded part 14 of the bridge pier 12 through high-strength bolts, selecting appropriate holes to insert the pin 15 according to the reserved length, completing the splicing of the inner truss unit 1-2 and the inner and outer truss units, and forming the truss type cantilever beam 1;

[0069] Bridge pier 12 second construction: placing the sand cylinder 8 at the position of the slide 7, lengthening the steel reinforcement in the lower region of the bridge pier 12, binding the steel reinforcement in the middle and upper region of the bridge pier 12, erecting the formwork of the middle and upper region of the bridge pier 12, checking the stability of the temporary support, and then pouring and maintaining the concrete in the middle and upper region of the bridge pier 12;

[0070] Construction of main girder 18: construction of main girder 18 is completed by cantilever pouring or cantilever assembly or support construction method;

[0071] Installation of traction cable 9: traction cable 9 is drawn out and wound outside truss cantilever beam 1, and the other end is inserted into jack 11 on counterforce seat 10;

[0072] Preparation before rotation: the bolt connection of the truss unit is checked again before rotation, the height difference between the bottom of support leg 6 and slide 7 is adjusted, the rotation bridge is weighed and tested, and the eccentric position is adjusted;

[0073] Rotation: the bridge is released from temporary fixation, traction cable 9 is slowly tensioned, the rotation speed and angle are strictly controlled, the horizontal condition of the rotation bridge is observed in real time, and whether a larger gap appears between support leg 6 and slide 7 is also observed, if a larger eccentricity appears, the reason should be found out and adjusted in time;

[0074] Wet joint pouring of main girder 18: after the bridge is rotated to the predetermined position, the concrete pouring and curing of the wet joint of main girder 18 are carried out;

[0075] Pouring of pedestal concrete 19: truss cantilever beam 1, outer transverse connecting beam 3, inner transverse connecting beam 2 and support leg 6 are removed and recycled, pedestal reinforcement 20 and reserved longitudinal steel bars 16 of the lower bearing platform are welded, transverse steel bars are arranged, the pedestal reinforcement is bound, the pedestal formwork is erected, the pouring and curing of the pedestal concrete are carried out, the hinge is sealed, and the post-tensioned prestressed steel bars 17 are further strengthened to connect the vertical connection between the bridge pier and the lower bearing platform.

[0076] The advantages of the present application include:

[0077] 1) the upper bearing platform can be eliminated;

[0078] 2) the construction efficiency and the hinge sealing engineering quality are improved;

[0079] 3) the support device can be recycled and reused;

[0080] 4) the size of the support device can be adjusted, and it is suitable for various bridge pier sections;

[0081] 5) the construction cost of the rotation bridge is reduced

[0082] 6) it is green and environmentally friendly, and has good sustainability.

[0083] The above describes the present application and its embodiments, which are not limited, and the embodiment shown in the drawings is only one of the embodiments of the present application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired thereby, without departing from the purpose of the present application, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the present application.

Claims

1. A swivel device for a truss-type cantilever steel beam in a swivel bridge, characterized by: The swivel device is composed of several truss cantilever beams, several inner transverse beams, several outer transverse beams, upper spherical hinges, lower spherical hinges, supporting feet, sliding tracks, sand cylinders, traction ropes, two counterforce seats and two jacks; The truss cantilever beams are symmetrically arranged at equal angles around the sectional center of the pier, one end of the truss cantilever beam is fixed to the lower part of the pier, the other end is connected to the supporting feet, the supporting feet fall on the sliding tracks, the sliding tracks are annular and are arranged at the center of the top of the lower bearing platform, the traction ropes are anchored to the pier, are wound on the outer side of the truss cantilever beam, pass through the counterforce seats and the jacks, the upper spherical hinges are embedded in the bottom of the pier, and the lower spherical hinges are located at the center of the sliding tracks; Several embedded parts are arranged around the outer side of the lower part of the pier, the arrangement positions of the embedded parts are matched with the arrangement mode of the truss cantilever beams, the embedded parts are used for connecting the truss cantilever beams and the pier through high-strength bolts, and the high-strength bolt connection can realize horizontal arbitrary rotation angles of 0-180 degrees; The embedded parts located at the lower part of the pier are provided with a locally reinforced structure, and the structure is matched with the torque of the swivel device; The heights of the truss cantilever beams are equal or increase from outside to inside, the number of the truss cantilever beams is the same as that of the supporting feet, the supporting feet are connected through high-strength bolts in the height direction, the inner and outer transverse beams are connected through high-strength bolts in the transverse direction, and a rotating disc is formed; The supporting feet are connected through high-strength bolts in the transverse direction, grooves are arranged on the outer side of the outer transverse beams, and the grooves are used for limiting the traction ropes; Steel sheets are arranged at the high-strength bolt connections and are used for adjusting height or length errors; The inner transverse beams are composed of several sub-beams, the sub-beams are axially provided with a plurality of holes, and pins pass through the holes to realize splicing of the sub-beams; The length of the inner transverse beams is consistent with the transverse spacing of the truss cantilever beams, the length of the inner transverse beams is adjusted by changing the hole positions of the pins; The truss cantilever beams are composed of several truss units, the truss units are provided with a plurality of holes, and the adjacent truss units are spliced through pins passing through the holes.

2. The swivel device for the truss type cantilever steel beam of the swing bridge according to claim 1, characterized in that: The truss units can be divided into outer truss units, standard truss units and inner truss units, and are composed of top chords, bottom chords and web members, the sectional forms of the top chords, the bottom chords and the web members can be circular, rectangular or I-shaped steel, and the sectional materials can be steel or steel pipe concrete.

3. The swivel device of the truss type cantilever steel beam of the swing bridge according to claim 1, characterized in that: The length of the truss cantilever beams is matched with the radius of the sliding tracks, the length of the truss cantilever beams is adjusted by increasing or reducing the number of the standard truss units and changing the hole positions of the pins between the truss units.

4. The swivel device of the truss cantilever steel beam of the swing bridge according to claim 1 or 3, characterized in that: The diameter of the pin is slightly smaller than that of the hole, the pin is provided with threads, the length of the threads exceeds the hole, and the pin is prevented from falling off by arranging a gasket and a nut.

5. The swivel device for the truss type cantilever steel beam of the swing bridge according to claim 1, characterized in that: The longitudinal steel bars or prestressed bars of the lower bearing platform extend out of the top surface and are used for realizing vertical reliable connection between post-poured platforms and the lower bearing platform after the bridge swivel is positioned.

6. A construction method of a swivel device of a truss-type cantilever steel beam in a swivel bridge, characterized by, Specifically includes the following steps: (1) Lower bearing platform construction, lower spherical hinge, slide installation: The lower bearing platform is poured in two times. After the first pouring of concrete reaches the specified strength, the working area of the lower spherical hinge and slide is cleaned, the quality of the required installation components is checked, the support steel frame of the lower spherical hinge and slide is installed according to the design position, the lower spherical hinge and slide are placed, the positioning is checked, the verticality and levelness are adjusted, the lower bearing platform reinforcement is bound, the second concrete pouring and maintenance are completed; (2) Upper spherical hinge installation: The lower spherical hinge is cleaned, then the Teflon slide block is laid, butter is applied for lubrication, the upper spherical hinge is hoisted, the levelness and verticality are checked, the gap between the upper and lower spherical hinges is closed with adhesive tape and other materials to prevent foreign matter from entering the inside of the gap; (3) First construction of bridge pier or tower: The sand cylinder is placed at the design position, the upper spherical hinge is fixed through the temporary support, the reinforcement in the lower region of the bridge pier is bound, the embedded part is installed according to the design position, the formwork in the lower region of the bridge pier is erected, the position of the embedded part is checked, the concrete in the lower region of the bridge pier is poured and maintained, after the concrete in the lower region of the bridge pier reaches the strength requirement, the formwork and support of the bridge pier are removed; (4) Assembly of support leg and outer transverse beam: The support leg is placed on the slide according to the specified position, the outer transverse beam is hoisted and positioned in sequence in a counterclockwise or clockwise direction, and then the high-strength bolt connection of the support leg and the outer transverse beam is performed; (5) Assembly of truss-type cantilever beam and connection with bridge pier: The temporary support is placed, the outer truss unit, standard truss unit and inner truss unit are hoisted in sequence, the high-strength bolt connection of the outer truss unit and the support leg and the inner truss unit and the embedded part in the lower region of the bridge pier is fixed, the appropriate hole is selected according to the reserved length and the pin shaft is inserted, the assembly of the inner truss unit and the inner and outer truss units is completed, and the truss-type cantilever beam is formed; (6) Second construction of bridge pier: The sand cylinder is placed at the slide position, the reinforcement in the lower region of the bridge pier is lengthened, the reinforcement in the middle and upper regions of the bridge pier is bound, the formwork in the middle and upper regions of the bridge pier is erected, the stability of the temporary support is checked, and then the concrete in the middle and upper regions of the bridge pier is poured and maintained; (7) Main beam construction: The main beam construction is completed through the methods of cantilever pouring, cantilever assembly or support construction; (8) Installation of traction cable: The traction cable is drawn out and wound on the outside of the truss-type cantilever beam, and the other end is inserted into the jack in the counter-force seat; (9) Preparation work before rotation: The bolt connection of the truss unit is checked again before rotation, the height difference between the bottom of the support leg and the slide is adjusted, the rotation bridge is weighed and tested, and the eccentric position is adjusted; (10) Rotation: The bridge is released from the temporary fixation, the traction cable is slowly tensioned, the rotation speed and angle are strictly controlled, the horizontal condition of the rotation bridge is observed in real time, and whether there is a large gap between the support leg and the slide is also observed. If a large eccentricity appears, the reason should be found out and adjusted in time; (11) Wet joint pouring of main beam: After the bridge is rotated to the predetermined position, the concrete pouring and maintenance of the wet joint of the main beam are performed; (12) Pouring of abutment concrete: The truss-type cantilever beam, outer transverse beam, inner transverse beam and support leg are removed and recycled, the abutment reinforcement and the reserved communication reinforcement of the lower bearing platform are welded, the transverse reinforcement is laid, the abutment reinforcement is bound, the abutment formwork is erected, the abutment concrete pouring and maintenance are performed, and the hinge closing is completed.

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