CN219260702U - Adjustable guide beam limiting device and bridge - Google Patents

Abstract

The utility model relates to the technical field of bridge engineering, and discloses an adjustable guide beam limiting device and a bridge, comprising: the guide beam seat is used for being connected with the guide beam; the main beam seat is used for being connected with the main beam; the two ends of the telescopic rod are respectively hinged to the guide beam seat and the main beam seat, and the length direction of the telescopic rod is along the bridge direction. The utility model has the following advantages and effects: when the girder receives the influence of temperature and produces the temperature deformation, guide beam stop device is in the locked state to form fixed hinge constraint, thereby release the vertical relative displacement at girder steel both ends, to the skew of long-term accumulation back guide beam, through the telescopic link of drive flexible, adjust the guide beam relative position between the girder, guarantee that the guide beam is located the bridge center, thereby improve the atress condition of guide beam and girder.

Description

Adjustable guide beam limiting device and bridge

Technical Field

The application relates to the technical field of bridge engineering, in particular to an adjustable guide beam limiting device and a bridge.

Background

At present, the cable-stayed bridge is used as a cable system bridge, has larger spanning capacity than a girder bridge, and is a main bridge type of a large-span bridge. China has built various types of cable-stayed bridges 100 so far, and has become the country with the largest number of cable-stayed bridges. For large-span cable-stayed bridges and multi-tower cable-stayed bridges, as the length of the bridge is generally longer, how to ensure the free expansion and contraction of the main girder under the annual temperature difference while improving the structural rigidity becomes a key problem in design.

In order to solve the problem, the novel large-span cable-stayed bridge adopts a part of ground anchor type structural system of 'Liang Da separation and beam platform consolidation', a main beam is fixedly connected with a ground anchor type bridge platform, the main beam is separated from a cable tower, and a 'main beam central shaftless joint + expansion joint' structure is arranged in a main span, so that two half cable-stayed bridges on two sides are connected into a whole. A large-displacement expansion joint is arranged at the center non-axial force joint of the main span so as to meet the requirement of longitudinal movement of two half cable-stayed bridge girders on two banks at the non-axial force joint.

According to the stress requirement of the main bridge structure system, the main girder is disconnected at the midspan position, and the basic structure is that four rectangular guide beams, namely guide beams, are symmetrically arranged in a large steel girder, one end of each guide beam is limited, and the other end of each guide beam is free and allows longitudinal relative sliding. The guide beam bottom is equipped with the guide rail, is equipped with the gyro wheel in big girder steel bottom, and the gyro wheel has the lift adjustment function, allows the guide beam to pull to the assigned position along the guide rail at the operation section. The guide beam is a key structure for solving the temperature load problem of the large-span cable-stayed bridge, and the use of the structure effectively solves the problems of bridge tower stress and girder horizontal displacement caused by temperature change. The safety and normal use of the guide beam are the precondition for ensuring the safety of the cable-stayed bridge, especially the safety of the cable-stayed tower, but after long-term use, the guide beam can generate certain deflection due to the factors of extrusion of a cargo vehicle, long-term change of air temperature and ageing of a bridge structure, so that the safety of the bridge is influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the purpose of the application is to provide an adjustable guide beam limiting device and a bridge, so that the position of the guide beam can be adjusted to adapt to the bridge displacement change caused by deformation after long-term stress.

In order to achieve the above purpose, on one hand, the technical scheme adopted is as follows:

the application provides an adjustable nose girder stop device, include:

the guide beam seat is used for being connected with the guide beam;

the main beam seat is used for being connected with the main beam;

the two ends of the telescopic rod are respectively hinged to the guide beam seat and the main beam seat, and the length direction of the telescopic rod is along the bridge direction; the telescopic rod comprises a sleeve with an opening at one end fixedly provided with a movable nut and a screw rod in threaded connection with the movable nut.

Preferably, the movable nut is positioned at the inner edge of the opening of the sleeve;

the screw rod is also sleeved with a self-locking nut, and the self-locking nut is positioned outside the sleeve;

when the self-locking nut rotates to be abutted against the sleeve, the self-locking nut locks the movable nut and the screw rod.

Preferably, the telescopic rod further comprises:

the connecting seat is hinged with the guide beam seat or the main beam seat;

and the driving motor is arranged on the connecting seat and is connected with the screw rod and used for driving the screw rod to rotate.

Preferably, the main beam seat includes:

a main girder bracket;

the main beam end support is connected with the main beam bracket through a connecting piece.

Preferably, the main beam end support includes:

the telescopic rods are hinged with one end of the first lug plate, which is far away from the main beam bracket;

the plurality of support webs are vertically arranged on the side face of the first ear plate;

the first connecting plate is used for being connected with the girder bracket and is arranged on the bottom surfaces of the first lug plate and the supporting web plate.

Preferably, the main girder bracket includes:

the support plates are used for being connected with the main beams and are staggered in a cross shape;

and the second connecting plate is used for being connected with the main beam end support and is arranged at the top end of the supporting plate.

Preferably, the guide beam seat includes:

a base for increasing the contact area with the guide beam;

and the second lug plate is arranged on the base and hinged with one end of the telescopic rod.

The application also provides a bridge comprising:

a multi-section main beam;

at least one guide beam which is arranged in the main beams in a sliding way and is positioned between the adjacent main beams;

an adjustable guide beam limiting device as described above, which is connected between the main beam and the guide beam, and only one end of each guide beam is connected with the adjustable guide beam limiting device.

Preferably, a first support for limiting the guide beam is arranged between the main beam and the guide beam.

The beneficial effects that technical scheme that this application provided brought include:

the utility model provides an adjustable nose girder stop device and bridge because telescopic link one end articulates in the girder seat, and the other end articulates in the nose girder seat. The guide beam does not bear the axial force of the main beams at the two ends, and can bear the vertical bending moment shearing force, the lateral bending moment shearing force and the torque of the main beams. When the girder is affected by temperature to generate temperature deformation, the guide beam limiting device is in a locking state to form fixed hinge constraint, one end of the guide beam is locked with the girder, the other end of the guide beam is in sliding constraint with the corresponding girder, and the guide beam can slide freely, so that longitudinal relative displacement of two ends of the girder is released. When the main beam is subjected to running load, after long-term accumulation, the guide beam and the main beam at one side generate larger displacement. When the vehicle passes through the bridge, the telescopic rods are driven to stretch out and draw back, the relative positions of the guide beams between the main beams are adjusted, and the guide beams are ensured to be positioned at the center of the bridge, so that the stress condition of the guide beams and the main beams is improved.

Meanwhile, in actual use, the whole guide beam is in a bent state. After the guide beam and the main beam are connected in a consolidation mode, the maximum tensile stress and the compression stress are distributed at the consolidation position of the guide beam and the main beam except for the stay cable anchor point of the top plate of the main beam and the larger stress concentration at the support, and the top surface of the large guide beam connection structure is mainly tensioned, and the bottom surface is pressed to be in a bent state. Therefore, if a major earthquake occurs, the position is the position where the guide beam is likely to be damaged first. Therefore, both ends of the guide beam limiting device are hinged with the main beam on one side and the guide beam, so that the guide beam limiting device has certain angle adjusting capability, the rigidity of the guide beam is improved, and stress concentration caused by the consolidation mode of the guide beam and the main beam is avoided.

The method can realize the conversion of different working conditions of the guide beams, and can realize the arbitrary conversion from synchronous working of double guide beams to independent working of single guide beams, so that the service life of the guide beam structure is doubled.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, 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 view of a structure of an embodiment in the present application at a right-hand angle.

Fig. 2 is an enlarged view at a in fig. 1.

FIG. 3 is an enlarged view of FIG. 1 at B

Fig. 4 is a schematic top view of the embodiment shown in fig. 1.

Fig. 5 is a schematic view of the telescopic rod according to the embodiment shown in fig. 1.

Reference numerals:

1. a guide beam seat; 11. a base; 12. a second ear plate; 2. a main beam seat; 21. a main girder bracket; 211. a support plate; 212. a second connecting plate; 22. a main beam end support; 221. a first ear plate; 222. a support web; 223. a first connection plate; 3. a telescopic rod; 31. a sleeve; 32. a screw rod; 33. a movable nut; 34. a self-locking nut; 35. a connecting seat; 36. a driving motor; 4. a main beam; 5. a guide beam; 6. a first support.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

In this application, as shown in fig. 1 and 4, an adjustable guide beam limiting device is provided, including a guide beam seat 1, a main beam seat 2 and a telescopic rod 3.

The girder base 1 is used for connecting with the girder 5, the girder 5 needs to slide along the bridge direction, the self movement impact is large, and the hinge is usually twisted off under the temperature deformation or slight shaking of the girder 5 when the telescopic rod 3 is directly hinged on the girder 5, so that the girder base 1 is needed to be used as a buffer.

The main beam mount 2 is adapted to be connected to the main beam 4, mainly by adjusting the telescopic rod 3 to the centre of the alignment guide beam 5. Generally, there are at least two sections of the main beams 4, and the present embodiment is located at one section, and the guide beams 5 pass through the two sections of the main beams 4 at the same time.

The two ends of the telescopic rod 3 are respectively hinged with the guide beam seat 1 and the main beam seat 2, and the telescopic rod 3 faces the forward bridge direction. The telescopic girder can be used for adjusting the position of the girder 5, locking one end of the girder 5 under the deformation caused by the conditions of temperature and vehicle load, ensuring that the girder 5 can freely move with the girder 4 at the other side, and releasing the deformation caused by temperature. Meanwhile, the guide beam 5 can be adjusted under the load of the traveling vehicle, the situation that the guide beam 5 is severely worn locally is avoided, and the service life of the guide beam 5 is prolonged.

In some preferred embodiments, as shown in fig. 5, the telescopic rod 3 further comprises a sleeve and a screw 32.

The movable nut 33 is fixed at the opening of the sleeve, the screw rod 32 is in threaded connection with the movable nut 33, and when the screw rod 32 rotates, the whole telescopic rod 3 can be expanded or contracted, so that the position of the guide beam 5 is adjusted. The adjustment is finer, and is suitable for the condition that the movement amplitude of the guide beam 5 is smaller.

According to bridge structural design, under the basic combined action, the branch counter force 24000KN (vertical) +10000KN (lateral direction) of a single guide beam is not considered in a normal operation state, the automobile load is only half considered, the branch counter force FN=12000 KN of the single guide beam is normally operated, the friction coefficient mu of a single guide beam support is less than or equal to 0.03, and the single guide beam is driven along the outside of a longitudinal bridge under the action of dead weight, namely, the longitudinal movement tension force Fpull=ff=mu.FN which is required to be provided by a guide beam limiting device is less than or equal to 20KN.

In some use processes, particularly after long-term use, because the bridge vehicles repeatedly enter, the loads of the vehicles are different, so that the bridge can generate more frequent vibration, the screw rod 32 is easy to loose, the guide beam 5 cannot be well fixed, the safety of the bridge is affected, the deformation amount of the guide beam 5 is extremely small in practice, the deformation with enough influence can be displayed only after a long time, and therefore, the position of the guide beam 5 does not need to be monitored constantly for adjustment.

Thus, in some preferred embodiments, the movable nut 33 is disposed at the inner edge of the opening of the sleeve 31, that is, the movable nut 33 is disposed in the sleeve 31, and protected by the sleeve 31, so as to reduce the probability of damage to the movable nut 33. Meanwhile, the screw rod 32 is further sleeved with a self-locking nut 34, when the self-locking nut 34 is screwed on the opening of the sleeve 31, the self-locking nut 34 can outwards draw the screw rod 32, the screw rod 32 is fixed by the movable nut 33, and large pressure is generated between the self-locking nut 34 and the threaded surface of the screw rod 32 due to the combination of the self-locking nut 34 and the movable nut 33, so that the screw rod 32 is locked by the self-locking nut 34, and the screw rod 32 cannot rotate. When the deformation of the bridge is detected to reach a certain preset condition, the manager can screw the self-locking nut 34 to the end closest to the guide beam seat 1, so that the self-locking nut 34 unlocks the screw rod 32, the screw rod 32 can freely rotate, and the position of the guide beam 5 is adjusted.

As shown in fig. 2, in some embodiments, the telescopic rod 3 further includes: the connecting seat 35 is hinged with the guide beam seat 1 or the main beam seat 2; and a driving motor 36 mounted on the connection seat 35, wherein the driving motor 36 is connected with the screw 32 for driving the screw 32 to rotate.

The guide beam position is adjusted by arranging a driving motor 36 to drive the screw rod to rotate.

In some embodiments, the main beam seat 2 is a directly poured cement pier, and the accuracy of the main beam seat 2 is generally poor, so that the direction of the telescopic rod 3 and the end face of the guide beam 5 cannot be ensured to be perpendicular.

Thus, in some preferred embodiments, the main beam mount 2 includes a main beam bracket 21 and a main beam end mount 22. The girder bracket 21 and the girder end support 22 are both of steel structure, and can maintain high precision in the production process so as to ensure the directivity of the telescopic rod 3. On the other hand, the general steel bracket is too long, and the tiny deformation generated during welding is amplified, so that the final height is difficult to control. The mode that combines together through girder bracket 21 and girder end support 22, girder bracket 21 is great, can play the supporting effect, and carries out finish machining to girder end support 22, guarantees the regularity with telescopic link 3 junction, and the tiny deformation that produces when girder bracket 21 and girder end support 22 are connected simultaneously can be in the installation process step by step through the various construction technologies of secondary operation and calibrate.

Further, the main beam end support 22 includes a first ear plate 221, a support web 222, and a first connecting plate 223.

As shown in fig. 3, the first ear 221 is approximately triangular in shape, which is the most accurate part of the whole main beam end support 22 to be processed, and one end of the first ear 221 extending out is hinged to the telescopic rod 3. And the side wall of the first ear plate 221 is further provided with a plurality of support webs 222 for providing support for the first ear plate 221. The bottoms of the first ear plate 221 and the supporting web 222 are first connecting plates 223, and the first connecting plates 223 are used for connecting with the main beam bracket 21, generally through bolting, so that deformation caused by connection can be reduced.

Further, the main beam bracket 21 includes a plurality of support plates 211 in a zigzag shape, and a second connection plate 212.

The cross arrangement of the support plates 211 in the cross shape can turn the deformation generated by connection to the transverse direction or the longitudinal direction, and has less influence on the height, and the second connection plates 212 on the top are used for dispersing pressure, so that all the support plates 211 can be protected from deformation when the guide beams 5 are pushed by using larger force.

In some practical application processes, the connecting surface between the guide beam seat 1 and the guide beam 5 is narrower, the end part of the guide beam 5 can be damaged after long-term use, and the end part of the guide beam 5 needs to be repaired again to reuse the guide beam limiting device.

Thus in some preferred embodiments the above-mentioned girder foundation 1 further comprises a base 11 and a second ear plate 12. Wherein the base 11 is used to increase the contact area between the chock 1 and the chock 5. The second ear plate 12 is used for buffering the left and right shaking of the guide beam 5 under the action of temperature deformation.

The application also provides a bridge, which comprises a multi-section main beam 4, at least one guide chain and the guide beam limiting device.

Specifically, in the embodiment shown in fig. 1, the number of sections of the main beams 4 is only two, meanwhile, only one guide beam 5 is provided, two ends of the guide beam 5 are respectively inserted into different main beams 4, the two sections of main beams 4 are connected with each other, the guide beam limiting device is only arranged at one end of the guide beam 5, the number of the guide beam limiting devices can be one or more, and when a plurality of guide beam limiting devices are provided, the guide beam limiting devices are symmetrically arranged at two sides of a transverse bridge along the symmetry plane of the guide beam 5, so that force application cannot deviate.

In some further embodiments, a first support 6 is further provided between the main beam 4 and the guide beam 5 for limiting the movement direction of the guide beam 5, so as to prevent the guide beam 5 from bending and tilting when the guide beam 5 is pushed by the guide beam limiting device.

In the description of the present application, it should be noted that the indicated orientation or positional relationship of the terms "upper" and "lower" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description of the present application and for simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

It should be noted that in this application, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. An adjustable nose girder stop device, characterized in that includes:

the guide beam seat (1) is used for being connected with the guide beam (5);

a main beam seat (2) used for connecting with the main beam (4);

the two ends of the telescopic rod (3) are respectively hinged to the guide beam seat (1) and the main beam seat (2), and the length direction of the telescopic rod (3) is along the bridge direction; the telescopic rod (3) comprises a sleeve with an opening at one end fixedly provided with a movable nut (33) and a screw rod (32) in threaded connection with the movable nut (33).

2. An adjustable guide beam stop as claimed in claim 1, wherein:

the movable nut (33) is positioned at the inner edge of the opening of the sleeve (31);

the screw rod (32) is also sleeved with a self-locking nut (34), and the self-locking nut (34) is positioned outside the sleeve (31);

when the self-locking nut (34) rotates to be abutted against the sleeve (31), the self-locking nut (34) locks the movable nut (33) and the screw (32).

3. An adjustable guide beam stop according to claim 1, characterized in that the telescopic rod (3) further comprises:

the connecting seat (35), the connecting seat (35) is hinged with the guide beam seat (1) or the main beam seat (2);

and the driving motor (36) is arranged on the connecting seat (35), and the driving motor (36) is connected with the screw rod (32) and is used for driving the screw rod (32) to rotate.

4. An adjustable guide beam stop according to claim 1, wherein the main beam seat (2) comprises:

a main girder bracket (21);

and the main beam end support (22) is connected with the main beam bracket (21) through a connecting piece.

5. An adjustable guide rail stop as claimed in claim 4, wherein the main rail end mount (22) comprises:

the telescopic rods (3) are hinged with one end, far away from the main beam bracket (21), of the first lug plates (221);

a plurality of support webs (222), wherein the support webs (222) are vertically arranged on the side surface of the first lug plate (221);

and the first connecting plate (223) is used for being connected with the main beam bracket (21) and is arranged on the bottom surfaces of the first lug plate (221) and the supporting web plate (222).

6. An adjustable guide beam stop as claimed in claim 4, wherein the main beam bracket (21) comprises:

the supporting plates (211) are used for being connected with the main beams (4) and are staggered in a groined shape;

and the second connecting plate (212) is used for being connected with the main beam end support (22) and is arranged at the top end of the supporting plate (211).

7. An adjustable guide beam stop according to claim 1, characterized in that the guide beam seat (1) comprises:

a base (11) for increasing the contact area with the guide beam (5);

and a second lug plate (12) arranged on the base (11) and hinged with one end of the telescopic rod (3).

8. A bridge, comprising:

a multi-section main beam (4);

at least one guide beam (5) which is arranged in the main beams (4) in a sliding manner and is positioned between the adjacent main beams (4);

an adjustable guide rail stop according to any of claims 1-7, which is connected between the main beam (4) and the guide rail (5), and only one end of each guide rail (5) is connected to the adjustable guide rail stop.

9. A bridge according to claim 8, wherein:

a first support (6) used for limiting the guide beam (5) is arranged between the main beam (4) and the guide beam (5).

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