CN219280514U - Bridge swivel system - Google Patents
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- CN219280514U CN219280514U CN202223419967.2U CN202223419967U CN219280514U CN 219280514 U CN219280514 U CN 219280514U CN 202223419967 U CN202223419967 U CN 202223419967U CN 219280514 U CN219280514 U CN 219280514U
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Abstract
The utility model relates to a bridge swivel system, which comprises a swivel pier provided with a swivel spherical hinge, a circular arc-shaped running track and an auxiliary supporting device running on the running track, wherein the auxiliary supporting device and the running track are both positioned between the swivel pier and a non-line-crossing side pier, a running driving mechanism configured by the auxiliary supporting device comprises a running driving unit, a driving gear and a transmission rack, a wheel shaft of the driving gear is connected with the output end of the running driving unit, the transmission rack is arranged on a ground foundation or a track plate of the running track, and the driving gear is meshed with the transmission rack. By arranging the auxiliary supporting device and the running track between the swivel piers and the non-line-crossing side piers, the auxiliary supporting device is easy to arrange and can be recycled, a multi-point statically-determined supporting system can be formed between the auxiliary supporting device and the swivel spherical hinge, and stronger anti-overturning stability can be obtained only by one swivel spherical hinge; the driving transmission resistance is small, and the operation is stable and can be greatly improved.
Description
Technical Field
The utility model belongs to the technical field of bridge engineering, and particularly relates to a bridge swivel system.
Background
The bridge horizontal swivel technology is a construction method for manufacturing a bridge on a non-design line position, and then horizontally swivel the bridge to the design line position by utilizing a swivel system. With the continuous development and enrichment of domestic traffic networks, more and more overpass overpasses are appeared. For overpasses crossing busy lines, horizontal swivel construction techniques have been widely used in order to reduce the impact of newly built bridge construction on the operation and safety of existing traffic under the bridge.
In the conventional swivel system, there is a multi-point support swivel system (for example, a evergreen road swivel bridge) in which auxiliary supports are provided on one side of a main span having a long structure and a heavy weight, in response to the fact that the bridge swivel structure is extremely asymmetric. In the mode, the top of the auxiliary support is connected with the swivel beam, the bottom of the auxiliary support is supported on the arc-shaped track beam, and meanwhile, the bottom of the auxiliary support is provided with a gear rack type driving system capable of running along an arc, so that tangential driving force is provided for the bridge swivel. But under general conditions, the main span crossing the existing traffic line is arranged on one side with larger span and heavier structure, and the space between the swivel piers and the existing traffic line is limited, so that the swivel piers have narrow application range and are only suitable for swivel bridges under special conditions, and meanwhile, the swivel system has the disposable characteristic and has higher engineering cost.
There are also multi-point support swivel means for providing auxiliary support at the side span beam end. For example, the Beijing-male inter-city solid-ampere super bridge is of a continuous beam structure and is in midspan closure. Although the main span length is larger than the side span length in the bridge forming state, the main span length is less than half of the bridge forming state in the actual rotating cantilever state due to the adoption of the span middle closure mode, the weight of the side span side beam body is larger than that of the main span beam body, and an auxiliary support is arranged on one side with a longer structure and heavier weight. According to the mode, the steel pipe concrete upright post is arranged at the end part of the side span to serve as an auxiliary support, an arc-shaped ground slideway beam is arranged below the auxiliary support, and the steel stranded wire is pulled by a conventional continuous jack to drive the auxiliary support, so that the whole beam body rotates. Meanwhile, in order to realize continuous steering of the traction force of the steel strand along the tangential direction of the arc in the rotating process, a plurality of guide mechanisms of the steel pipe concrete upright posts are arranged on the inner side of the arc ground slideway beam. When the steel strand is pulled to rotate in the rotating mode, larger radial extrusion force exists between the steel strand and the upright post of the guide mechanism, and the friction resistance between the steel strand and the short upright post needs to be overcome in the rotating process; when the swivel angle is larger, the arc track is longer or the radius of the arc track is smaller, the friction resistance can be greatly increased, the resistance effect is obvious, and the traction power efficiency in the tangential direction is poor. Therefore, the method is only suitable for the swivel bridge with smaller swivel angles, and the efficiency is poor when the swivel angles are larger.
In addition, the construction of the horizontal turning method can be divided into a balanced rotator and a non-balanced rotator, wherein the balanced rotator can be divided into two modes of self-balancing and balanced balance, and the non-balanced rotator is used for maintaining the balance of the rotator by using an anchoring cable system. At present, the most common horizontal turning mode is a turning mode in which a single point supporting turning with a counterweight is used, namely, two sides of a turning structure are basically symmetrical relative to the center of the turning, and the counterweight is not needed or even a little asymmetry exists, but the balance of the turning can be kept through the counterweight. The swivel weight of this kind of mode is supported by central spherical hinge single point, because the anti-capsizing stable moment of swivel structure in the rotation in-process is provided by the frictional force of spherical hinge, and anti-capsizing stability is relatively poor, appears rocking phenomenon easily especially to the structure that tows. Therefore, in order to prevent the stability of the swivel structure from being affected by construction errors or unbalanced moment generated by structural asymmetry, the swivel structure needs to be weighed and properly weighted before the swivel. The current common weighting mode is to utilize the turntable structure on the jack support and set displacement meter to measure the displacement change of the upper turntable, and when the spherical hinge rotates instantaneously, the unbalanced bending moment of the structure is calculated according to the jack force applied vertically and horizontally. The weighing and weighting mode is affected by manual operation and instrument precision, the error hinge of a weighing result is large, meanwhile, the weighing and weighting process is complicated, the time is long, and the effect of stable rotation balance can be achieved only after repeated adjustment of weighing, weighting, re-weighing, re-weighting, … and the like is needed.
Disclosure of Invention
The utility model relates to a bridge swivel system which at least can solve part of defects in the prior art.
The utility model relates to a bridge swivel system, which comprises swivel piers, an auxiliary supporting device and a circular arc-shaped running track, wherein a swivel spherical hinge is arranged on each swivel pier; the walking driving mechanism comprises a walking driving unit, a driving gear and a transmission rack, the walking driving unit is installed on the auxiliary supporting device, a wheel shaft of the driving gear is connected with the output end of the walking driving unit, the transmission rack is installed on a ground foundation or a track plate of a walking track, and the driving gear is meshed with the transmission rack.
As one of the implementation modes, the walking driving mechanism further comprises limiting wheels, the limiting wheels and the driving gear are arranged on two sides of the transmission rack respectively, and the limiting wheels are abutted against corresponding side walls of the transmission rack.
As one embodiment, the auxiliary supporting device comprises a plurality of auxiliary supporting legs, each auxiliary supporting leg is provided with one walking part, and each walking part is arranged on the walking track.
As one embodiment, two adjacent auxiliary legs are connected through a transverse connecting beam.
As one embodiment, a plurality of transverse connection beams are arranged between two adjacent auxiliary supporting legs, and the transverse connection beams are connected to form one or more truss beams.
As one of the implementation modes, the walking part is connected to the bottom end of the auxiliary supporting leg, and a force measuring module is arranged at the joint of the walking part and the auxiliary supporting leg.
As one of the embodiments, a distance between the auxiliary supporting device and a swivel axis defined by the swivel ball hinge is in a range of 25-80 m.
As one of the implementation modes, the swivel spherical hinge is positioned at the pier top, the pier bottom or in the pier of the swivel pier.
The utility model has at least the following beneficial effects:
according to the bridge swivel system provided by the utility model, the auxiliary supporting device and the walking track are arranged between the swivel piers and the non-overline side piers, the auxiliary supporting device is easy to arrange, the arm of force of the auxiliary supporting device relative to the swivel axis can be larger, a multi-point static supporting system can be formed between the auxiliary supporting device and the swivel spherical hinge, the stress is clear, the balance of a swivel structure can be kept, and the overturning-resistant stability is higher, so that only one swivel spherical hinge is required to be arranged, the components such as a turntable, a supporting foot, a slideway, a counter-force seat and a traction cable in the conventional swivel system are omitted, the swivel system scale is greatly reduced, and the condition that the construction safety risk is greatly reduced due to the arrangement of a large-scale swivel construction platform on the swivel piers is avoided. On this basis, combine the rack and pinion type drive mode, drive transmission resistance is little, and auxiliary stay's operation steadily can promote greatly, can be applicable to various working conditions of turning, when turning the angle great, also can guarantee reliable driving efficiency, has solved current drawing steel strand wires through the jack effectively in order to drive auxiliary stay device activity defect that exists.
Because this auxiliary stay device sets up between turning mound and side mound, consequently can reuse, reduced construction cost effectively.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of bridge swivel construction provided by an embodiment of the utility model;
FIG. 2 is a schematic view of a swivel beam provided with an auxiliary supporting device and a counterweight body according to an embodiment of the utility model;
FIG. 3 is a schematic diagram of a method for balancing weights according to an embodiment of the present utility model;
fig. 4 is a schematic structural view of an auxiliary supporting device according to an embodiment of the present utility model;
fig. 5 is a schematic diagram of a connection structure between an auxiliary leg and a walking part according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a bridge swivel construction without a cast-in-place closure segment according to an embodiment of the present utility model;
fig. 7 is a schematic view of the top surface elevation of the permanent support of Yu Zhudun of the top surface elevation of the swivel ball hinge of fig. 6.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
Referring to fig. 2 and 3, an embodiment of the present utility model provides a method for balancing weights in a bridge swivel construction process, the method including:
(1) A beam body restraint device is arranged below the beam body 1, a certain interval is arranged between the beam body restraint device and the swivel piers 4, and the interval is defined as L 0 The top end of the beam body restraint device is in restraint fit with the beam body 1, and the bottom end of the beam body restraint device is arranged on the ground foundation; the beamThe body restraint device is provided with a force measuring module for detecting the acting force of a beam body, for example, a force measuring sensor is adopted;
(2) Calculating theoretical unbalance moment M of rotating body structure C Theoretical counterweight T balanced with swivel structure 0 Wherein, the method comprises the steps of, wherein,
wherein L is S The distance from the counterweight preset position to the axis of the swivel is set; for M c Preferably, the moment for causing the beam body 1 to deflect to the main span is positive, and the moment for causing the beam body 1 to deflect to the main span is negative;
(3) Pre-weighting T is carried out on the rotating body structure at the preset position of the counterweight 1 Then the temporary locking between the beam body 1 and the swivel pier 4 is removed, and the detection value F of the force measuring module is obtained 1 ；
Wherein, preferably, the counterweight T is pre-weighted 1 Slightly greater than theoretical counterweight T 0 The beam 1 is ensured to have a tendency to tilt toward the counterweight side, but it is obviously to avoid the beam 1 from tilting toward the counterweight side, optionally T 1 Ratio T 0 100-200kN (without withdrawing the beam body restraint device, i.e. the beam body restraint device acts as a subsequent swivel auxiliary support);
(4) According to the detection value F 1 Pre-counterweight T 1 The actual unbalanced moment M of the rotating body structure can be obtained G ：
M G ＝T 1 L S -F 1 L 0
(5) Adjusting the weight of the counterweight to T 2 Make the detection value F of the force measuring module 2 And within the set range, the counterweight operation is completed.
Preferably, the above setting range is 100-200kN.
Based on the counterweight mode, balance of the swivel structure can be guaranteed, swivel resistance can be controlled in a smaller range, and smoothness, reliability and safety of a bridge swivel are guaranteed.
The weight balancing mode is convenient to operate, does not need to carry out weight balancing operation on the beam body 1, can obviously reduce the construction labor intensity, and avoids the problem of low accuracy of the weight balancing operation of the beam body 1 caused by manual operation, instrument precision condition and the like; the counterweight mode has fewer operation steps, omits the complicated processes of weighing, counterweight, re-weighing and re-counterweight …, and can obviously improve the construction efficiency of bridge swivel construction, shorten the construction period and reduce the construction cost.
Wherein, the beam body restraining device is preferably positioned at the same side of the swivel pier 4 as the counterweight preset position, and the arrangement condition is not limited by the barrier under the bridge, so the arrangement is convenient, and the distance L between the beam body restraining device and the swivel pier 4 is more convenient 0 The weight can be controlled in a relatively large range (for example, in a range of 25-80 m), and the weight accuracy can be improved; in the counterweight operation process, the beam body restraint device mainly bears the pressure of the beam body, and correspondingly, the force measuring module can adopt detection devices such as a pressure sensor 22 and the like; in this manner, the top end of the beam body restraint device may be fixedly connected to the beam body 1, or may be simply held in contact with the beam body 1 but not fixed, so that reliable restraint on the beam body 1 can be ensured.
The beam body restraint device can be dismantled after the counterweight operation is finished, and can be used as an auxiliary support for further utilization in the subsequent bridge swivel process, so that one set of device can have multiple functions, participate in bridge swivel construction in multiple aspects, has high equipment utilization rate, and can obviously reduce construction steps; when the beam body restraint device is used as an auxiliary support, in bridge swivel construction, the load applied by the auxiliary support device can be continuously monitored by the force measuring module, so that an auxiliary early warning effect can be achieved, the safety and reliability of bridge swivel construction operation are improved, and the risk of overturning of the beam body 1 is reduced.
Example two
The embodiment provides an auxiliary supporting device which is used for bridge swivel construction.
As shown in fig. 1, 4 and 5, the auxiliary supporting device comprises at least two auxiliary supporting legs 2, wherein the height of the auxiliary supporting legs 2 meets the requirement of being connected with the bottom of the beam body; each auxiliary supporting leg 2 is provided with a walking part 21, the walking part 21 is connected with the bottom end of the auxiliary supporting leg 2, and a force measuring module is arranged at the joint of the walking part and the auxiliary supporting leg; at least part of the traveling unit 21 is provided with a traveling drive mechanism.
In one embodiment, as shown in fig. 5, the running part 21 adopts a roller structure, and includes a wheel frame and rollers disposed on the wheel frame, wherein the number of the rollers may be one or more, and the rollers may adopt universal wheels or structures such as designing the rollers with a certain taper (adapting to the radius of the arc track), so as to ensure smooth running on the arc track.
In another embodiment, the walking part 21 adopts a slide plate structure, which comprises a slide plate frame and a slide plate arranged at the bottom of the slide plate frame.
Further, the auxiliary supporting device is further provided with a running rail 6, and the running part 21 runs on the running rail 6; the running track 6 is an arc track, and the center of the arc track is located on the central axis of the bridge swivel pier 4 during actual construction. For the roller type walking parts 21, when the rollers are universal wheels, each walking part 21 can still normally walk on the arc-shaped track when being distributed in a straight line, but when the auxiliary supporting legs 2 are three or more, each walking part 21 is preferably distributed in an arc-shaped curve; in the case of a plurality of the auxiliary legs 2, the plurality of the skateboard type walking units 21 are preferably arranged in an arc-shaped curve (it is also possible to mount the skateboard on the skateboard frame via a universal joint). The structural form of the running rail 6 is matched with the running part 21, and will not be described in detail here.
Preferably, as shown in fig. 5, the above-mentioned walking driving mechanism adopts a gear rack driving mode, specifically, the walking driving mechanism comprises a walking driving unit 23, a driving gear 251 and a transmission rack 252, wherein the walking driving unit 23 is installed on a corresponding auxiliary supporting leg 2 or walking part 21 through a mounting frame, a wheel shaft of the driving gear 251 is connected with an output end of the walking driving unit 23, the transmission rack 252 is installed on a ground base or on a track plate of the above-mentioned walking track 6, the driving gear 251 is meshed with the transmission rack 252, and the driving gear 251 rotates around an axis thereof under the driving action of the walking driving unit 23, so that the auxiliary supporting leg 2/the walking part 21 can be driven to move relative to the transmission rack 252, and the walking of the walking part 21 on the walking track 6 is realized. It can be appreciated that the driving rack 252 is an arc rack and is concentric with the rail surface of the running track 6; the travel drive unit 23 may employ a conventional rotation drive device such as a motor speed reducer assembly.
Further, as shown in fig. 5, the walking driving mechanism further includes a limiting wheel 253, and the limiting wheel 253 may be mounted on the mounting frame through a bracket; the limiting wheel 253 and the driving gear 251 are separately arranged at two sides of the transmission rack 252, for example, the driving gear 251 is meshed with an outer ring of the transmission rack 252, and the limiting wheel 253 is abutted against an inner ring of the transmission rack 252; the limiting surface of the driving rack 252 is preferably a smooth arc-shaped curved surface, and the limiting wheel 253 rolls on the limiting surface. By providing the limiting wheel 253, the degree of engagement between the drive gear 251 and the drive rack 252 can be ensured, and the reliability of the travel drive and the smoothness of the travel portion 21 can be improved.
Compared with the existing driving mode of pulling the steel strand wires through the jack to drive the auxiliary supporting device to move, the driving mode of adopting the gear rack type driving mode is adopted in the embodiment, driving transmission resistance is small, operation of the auxiliary supporting device can be stably and greatly improved, the driving device can be suitable for various rotating working conditions, and reliable driving efficiency can be ensured when the rotating angle is large.
The auxiliary supporting leg 2 can be of a steel pipe structure or a steel pipe concrete column structure, is convenient to manufacture and has a better supporting effect, wherein the steel pipe structure is lighter, and the steel pipe concrete is higher in strength.
Preferably, the auxiliary supporting leg 2 is divided into a plurality of supporting leg sections for assembly, and the supporting leg sections are connected by high-strength bolts, and based on the design, the auxiliary supporting leg 2 can be made into a standardized product, is suitable for different bridge heights through assembly, is flexibly combined, and is convenient for transportation, storage, installation and the like; wherein the length of the individual leg segments is preferably between 4 and 5m.
When a plurality of auxiliary supporting legs 2 exist, the adjacent auxiliary supporting legs 2 are preferably connected through the transverse connecting beam 20, so that the structural strength and stability of the auxiliary supporting device can be improved, the action consistency and coordination among the auxiliary supporting legs 2 can be improved, and the activity smoothness and stability of the auxiliary supporting device are improved. The transverse connection beams 20 may be plural, and one or more truss beams may be formed by connecting the transverse connection beams 20.
In one embodiment, a sleeved connection structure is adopted between the auxiliary supporting leg 2 and the walking part 21, specifically, as shown in fig. 5, the sleeved connection structure comprises a sleeved outer tube 242 and a sleeved inner column 241 embedded in the sleeved outer tube 242, wherein the sleeved outer tube 242 is arranged at the bottom end of the auxiliary supporting leg 2, the sleeved inner column 241 is arranged at the top end of the walking part 21, or the sleeved inner column 241 is arranged at the bottom end of the auxiliary supporting leg 2, and the sleeved outer tube 242 is arranged at the top end of the walking part 21; the column end of the sleeved inner column 241 is propped against the bottom of the sleeved outer tube 242; the force measuring module adopts the pressure sensor 22, and the pressure sensor 22 is clamped between the column end of the sleeved inner column 241 and the bottom of the sleeved outer tube 242, so that the force measuring is accurate and can be reused.
The detection mode can accurately and reliably detect the load born by the auxiliary supporting leg 2; the adoption of the sleeved connection structure can facilitate the disassembly and assembly of the auxiliary supporting device, can continuously monitor the load born by the auxiliary supporting device in bridge swivel construction, can play the role of auxiliary early warning, improve the safety and reliability of bridge swivel construction operation, and reduce the risk of overturning of the beam body 1.
When the auxiliary supporting device is applied to the first embodiment described above to serve as the beam body restraining device therein, the counterweight accuracy can be effectively improved. In another embodiment, on the basis of the above-mentioned socket-type connection structure, after the counterweight operation is completed, the socket-type outer tube 242 and the socket-type inner column 241 can be fixedly connected as a whole, so as to improve the operation stability of the auxiliary supporting device in the swivel process, for example, the socket-type outer tube 242 and the socket-type inner column 241 are welded and fixed, or, the edge of the tube orifice of the socket-type outer tube 242 or the outer wall of the socket-type outer tube 242 is provided with a first flange plate, the corresponding position of the socket-type inner column 241 is provided with a second flange plate, and after the counterweight operation is completed, the socket-type outer tube 242 and the socket-type inner column 241 are subjected to flange assembly and fixing.
Alternatively, the auxiliary leg 2 and the walking portion 21 may be directly abutted against each other by an end plate, and the pressure sensor 22 may be interposed between the two end plates, and after the counterweight operation is completed, the two end plates may be welded or flange-assembled.
In another embodiment, the force measuring module includes a detection steel pipe, the top end of the detection steel pipe is connected with the auxiliary supporting leg 2, the bottom end of the detection steel pipe is connected with the traveling part 21, and a strain gauge is arranged on the surface of the detection steel pipe, so that the function of acquiring the pressure of the auxiliary supporting leg 2 can be realized.
For the connection between the auxiliary supporting leg 2 and the bottom of the beam body, a detachable connection mode is preferably adopted, so that the auxiliary supporting device can be reused, and the construction cost is saved; the detachable connection modes such as the bolt connection and the like are suitable for the embodiment, and the reliable connection between the auxiliary supporting leg 2 and the beam body 1 can be ensured.
Example III
Referring to fig. 1 and 2, the embodiment of the utility model provides a bridge swivel construction method, which includes the following steps:
s1, constructing a swivel pier 4, and arranging a swivel structure at a corresponding position of the swivel pier 4;
s2, manufacturing a swivel beam 1 at a prefabricated position in front of a swivel;
s3, arranging a walking track 6 and an auxiliary supporting device below the swivel beam 1, wherein the auxiliary supporting device and the walking track 6 are both positioned on the non-line-crossing side, the bottom of the auxiliary supporting device walks on the walking track 6, and the top of the auxiliary supporting device is connected with the bottom of the swivel beam 1;
s4, carrying out weight balancing on the swivel beam 1;
s5, bridge swivel construction is conducted.
The design and construction of the swivel pier 4 and the foundation below the swivel pier are conventional in the art, and are not described herein.
Preferably, a ball hinge type swivel is adopted, and the swivel structure correspondingly adopts a swivel ball hinge 5, for example, the swivel ball hinge comprises a ball hinge base and a support type ball hinge; the turning mode can be a pier top turning body, a pier middle turning body or a pier bottom turning body, and the setting positions of the turning structures are correspondingly matched, which is not described in detail herein.
The bridge can be a continuous bridge, a T-shaped bridge and the like; the following details the above method using a continuous beam bridge as an example, and specific embodiments of the T-bridge and the like are easily designed by those skilled in the art:
(1) In the case of a continuous beam bridge, for the pier top swivel mode, in the above step S1, the main pier permanent supports 41 and the main pier support stones 42 of the continuous beam may be also provided accordingly; in S2, after the swivel beam 1 is manufactured, the beam body 1 and the swivel piers 4 are locked in a temporary consolidation mode, and before the bridge swivel construction, the temporary locking is correspondingly required to be removed. Preferably, in S5, after the swivel is set to the designed bridge position, the swivel ball hinge 5 is removed, and the swivel beam 1 is supported on the main pier permanent support 41 in a switching manner.
(2) In the case of a continuous beam bridge, in the step S1, a lower foundation is first constructed, a swivel spherical hinge 5 is provided at the bottom of the swivel pier 4, the construction of the swivel pier 4 is performed at a prefabricated position before the swivel, a rear sealing connection reinforcing bar joint is provided between the bottom of the pier and the bearing platform, the bottom of the pier and the bearing platform are temporarily locked (the temporary locking is correspondingly removed before the swivel construction of the bridge), the swivel pier 4 is then constructed to a design elevation, and a main pier permanent support 41 and a main pier support pad stone 42 are installed at the top of the pier. S2, after the swivel beam 1 is manufactured, temporarily solidifying the beam body 1 and the swivel piers 4; and S5, after turning to the designed bridge position, connecting the rear sealing reinforcing steel bars between the pier bottom and the bearing platform, and pouring the rear sealing area.
(3) When the bridge is a continuous beam bridge, for the turning body mode in the pier, in the step S1, a lower foundation is firstly constructed, a lower turning body pier is constructed to the turning body position in the pier according to the actual bridge position, a turning body spherical hinge 5 is installed, then an upper turning body pier construction is carried out according to the prefabricated position before turning body, and a connecting reinforcement joint is sealed and fixed after the upper turning body pier and the lower turning body pier are reserved; after temporarily locking the upper and lower swivel piers, the upper swivel pier is constructed to a design elevation, and a main pier support pad 42 and a main pier permanent support 41 are installed at the pier top. S2, after the swivel beam 1 is manufactured, temporarily solidifying the beam body 1 and the swivel piers 4; and S5, connecting rear sealing reinforcing steel bars between the upper swivel piers and the lower swivel piers after the swivel is turned to the designed bridge position, and pouring a rear sealing area.
The construction method provided by the embodiment has a wide application range. In one embodiment, preferably, the prefabricated length of the swivel beam 1 is equal to the bridge forming length, or the main span side beam section is longer than the side span side beam section, and the side span side beam section is correspondingly weighted.
In one embodiment, in the step S5, after the bridge swivel is completed, the closure of the girder structure and the installation of the side pier support 71 are completed according to a conventional construction method. And dismantling the components such as the counterweight body 3, the auxiliary supporting device, the running track 6 and the like to finish the system conversion of the bridge structure, thereby forming a bridge.
Preferably, in the above-mentioned scheme, the auxiliary supporting device may be an auxiliary supporting device provided in the second embodiment.
Preferably, in the step S4, the method of balancing weights provided in the first embodiment may be adopted, and the beam body restraining device may be an auxiliary supporting device, without any additional arrangement.
Wherein, the distance L between the auxiliary supporting device and the axis of the rotating body 0 Preferably not less than 25m, more preferably controlled in the range of 25-80 m, the position is selected to be universal and can meet the requirements of most swivel bridges under general conditions; in addition, the force arm between the auxiliary supporting device and the swivel spherical hinge 5 is longer, a multi-point statically-determined supporting system can be formed between the auxiliary supporting device and the swivel spherical hinge 5, the stress is clear, the balance of the swivel structure can be kept, and the overturning-resistant stability is high.
According to the swivel method provided by the embodiment, only one swivel spherical hinge 5 is needed to be arranged, components such as a turntable, supporting feet, a slideway, a counter-force seat and a traction rope in a conventional swivel system are omitted, the scale of the swivel system is greatly reduced, a large-scale swivel construction platform is prevented from being arranged on a swivel pier 4, the construction safety risk is greatly reduced, the construction process is simplified, and the engineering cost can be correspondingly reduced; particularly, when the swivel system is arranged at the bottom of the pier, the scale of a foundation pit of the swivel pier can be effectively reduced, and the safety and the economy of engineering construction are improved.
Example IV
In bridge swivel construction, the upper beam body 1 generates certain downwarping under the swivel cantilever state, if the swivel length of the beam body 1 is equal to the bridge forming length, the downwarping can enable the beam end to collide with the side pier support 71 or the side pier support filler, and if the swivel beam 1 spans more, the downwarping can even lead the beam body 1 to collide with the side pier capping beam, so that smooth swivel cannot be realized. In order to solve the problem, the span continuous beam bridge for swivel construction generally has two design and construction methods, and the two design and construction methods are as follows: (1) The method is that the length of a turning body of the beam body 1 is designed to be smaller than the length of a bridge, a cast-in-situ closure section with a certain length is arranged near an edge pier 7 after the turning body is in place, and the bridge span is completed by casting the closure section on site. The mode is the most commonly adopted scheme at present, and has the advantages that the side pier support 71 can be guaranteed to have a certain counter force after construction is finished, so that the phenomenon of side support void does not occur in the operation and use stage of the structure; the construction of the cast-in-situ closure section is required to build a cast-in-situ support, and the span side cast-in-situ support is closely adjacent to the under-bridge structure, so that the operation and the safety of the under-bridge structure can be greatly influenced during the construction. (2) The other method is to design the length of the turning body of the beam body 1 to be equal to the bridge forming length, but the side pier support 71, the side pier support cushion stone or the capping beam is not constructed once, and a turning space is reserved; when the beam body 1 is constructed in place in a turning way, the beam body 1 is jacked at the side span beam end, and the side pier support 71, the side pier support filler stone or the capping beam and other components at the side pier 7 are constructed, the cast-in-situ closure section construction can be realized in this way, and the side pier support 71 can also have a certain counter force reserve. However, this method requires pouring side pier support stones or capping beams under the beam body 1 after turning and installing the side pier support 71, and has limited construction space, difficult operation, difficult construction quality assurance, and easy resulting in larger errors of support reaction force and design value.
Based on this, the bridge swivel construction method provided in the third embodiment is optimized in this embodiment.
In this embodiment, the construction method is mainly based on a pier top turning mode, wherein, as shown in fig. 6, the construction method includes the following steps:
(1) And a swivel pier 4 is constructed.
Referring to fig. 7, when constructing the swivel ball hinge 5 and the main pier support assembly at the pier top of the swivel pier 4, by adjusting the height of the ball hinge base, the top surface height of the swivel ball hinge 5 (i.e. the bottom height of the swivel beam 1) is higher than the top surface height of the main pier permanent support 41, and meanwhile, the difference between the top surface of the swivel ball hinge 5 and the top surface of the main pier permanent support 41 is greater than the deflection value of the swivel beam 1 end and leaves a proper margin (preferably controlled to be 10 cm-20 cm), the structural design ensures that the beam bottom height of the beam end of the swivel front swivel beam 1 in the cantilever state is higher than the top height of the side pier support 71 which is preset, the swivel is not blocked, and the space between the bottom of the swivel beam 1 and the pier top of the swivel pier 4 can meet the space height requirement of construction operation of constructors.
(2) The swivel beam 1 is applied.
When the swivel beam 1 is applied, the length of the swivel beam 1 is equal to the length of the bridge, the length of the cast-in-situ closure section is not arranged, and the side span bent cap is synchronously applied.
(3) After the construction of the swivel beam 1 is completed, a jack is arranged at the end part of the swivel beam 1 before the swivel, the beam body 1 is jacked (the jacking position corresponds to the supporting position of the side pier support 71), the jacking force is preferably a support counter force design value F at the side pier 7 when the bridge is formed, and the deflection upward value delta at the end of the swivel beam 1 is measured; then removing the jack, and measuring the beam bottom elevation data H of the side pier support 71 position and the main pier permanent support 41 position of the swivel beam 1 Edge(s) And H In (a) 。
According to the measured deflection value of the end of the swivel beam 1 and the beam bottom elevation data, combining the design elevation T of the top of the main pier support cushion stone 42 on the swivel pier 4 In (a) The actual top elevation of the pier support bolster at pier 7 was calculated as:
T edge(s) ＝H Edge(s) -d h -t Edge(s) +Δ
Wherein d h Is the falling height value d of the swivel beam 1 h ＝H In (a) -T In (a) -t In (a) ，t Edge(s) And t In (a) The heights of the side pier support 71 and the main pier permanent support 41, respectively.
According to the calculated T Edge(s) And casting and constructing an edge pier support bolster at the pier top position of the edge pier 7 to an actual elevation, and installing an edge pier support 71.
(4) And performing swivel construction on the swivel beam 1.
(5) After the swivel is completed, the power balance system (components such as a counterweight body 3, an auxiliary supporting device, a walking track 6 and the like) of the swivel is removed, meanwhile, a jack is arranged at the pier top of the swivel pier 4 to support the swivel beam 1, and the swivel spherical hinge 5 and a spherical hinge base are removed, so that the swivel beam 1 falls onto the main pier permanent support 41 and the side pier support 71 of the swivel pier 4 to complete system conversion, and then bridge deck auxiliary facilities are constructed to form a bridge state.
In the embodiment, the swivel beam 1 is not provided with a cast-in-situ closure section, and the swivel beam falls into a bridge after the swivel beam falls, so that the influence of side span cast-in-situ section construction on the operation and safety of structures such as railways, highways and the like under the bridge is avoided, the construction procedures of the bridge after the swivel are reduced, and the construction period is shortened; meanwhile, in the construction method of the cast-in-place closure section without casting the side pier support cushion stone in comparison with the post-cast side pier support cushion stone, in the embodiment, the side pier support 71 of the side pier 7 and the side pier support cushion stone can be constructed before a swivel, and the beam Cheng Qiao directly falls after the swivel, so that the problems that the side pier support 71 is difficult to operate, the construction quality is difficult to guarantee, the support counter force and the design value error are large and the like when the side pier support 71 is constructed after the swivel are avoided.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (8)
1. The utility model provides a bridge system of turning, includes the mound of turning, is equipped with the ball pivot of turning on the mound of turning, its characterized in that: the auxiliary supporting device and the walking rail are both positioned between the swivel piers and the non-line-crossing side piers, the auxiliary supporting device is provided with a walking part and a walking driving mechanism, and the walking part is arranged on the walking rail; the walking driving mechanism comprises a walking driving unit, a driving gear and a transmission rack, the walking driving unit is installed on the auxiliary supporting device, a wheel shaft of the driving gear is connected with the output end of the walking driving unit, the transmission rack is installed on a ground foundation or a track plate of a walking track, and the driving gear is meshed with the transmission rack.
2. The bridge swivel system of claim 1 wherein: the walking driving mechanism further comprises limiting wheels, the limiting wheels and the driving gears are arranged on two sides of the transmission rack respectively, and the limiting wheels are abutted to the corresponding side walls of the transmission rack.
3. The bridge swivel system of claim 1 wherein: the auxiliary supporting device comprises a plurality of auxiliary supporting legs, each auxiliary supporting leg is provided with a walking part, and each walking part is arranged on the walking track.
4. A bridge swivel system as claimed in claim 3 wherein: two adjacent auxiliary supporting legs are connected through a transverse connecting beam.
5. The bridge swivel system of claim 4 wherein: a plurality of transverse connecting beams are arranged between two adjacent auxiliary supporting legs, and one or a plurality of truss beams are formed by connecting the transverse connecting beams.
6. A bridge swivel system as claimed in claim 3 wherein: the walking part is connected to the bottom end of the auxiliary supporting leg, and a force measuring module is arranged at the joint of the walking part and the auxiliary supporting leg.
7. The bridge swivel system of claim 1 wherein: the distance between the auxiliary supporting device and the rotating body axis defined by the rotating body spherical hinge is in the range of 25-80 m.
8. The bridge swivel system of claim 1 wherein: the swivel spherical hinge is positioned at the pier top, the pier bottom or in the pier of the swivel pier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223419967.2U CN219280514U (en) | 2022-12-13 | 2022-12-13 | Bridge swivel system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223419967.2U CN219280514U (en) | 2022-12-13 | 2022-12-13 | Bridge swivel system |
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| CN219280514U true CN219280514U (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223419967.2U Active CN219280514U (en) | 2022-12-13 | 2022-12-13 | Bridge swivel system |
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| CN (1) | CN219280514U (en) |
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