CN220079697U - Wind-resistant device and wind-resistant system of single-side large cantilever cable-stayed bridge - Google Patents

Abstract

The embodiment of the utility model provides an anti-wind device and an anti-wind system of a single-side large cantilever cable-stayed bridge. The wind resistance device comprises a prefabricated support, a side wall support, a bridge center support and a top cross beam: the prefabricated support is connected with the bridge body; the side wall support is connected with the prefabricated support in a sliding manner and extends along the forward bridge; the bridge center support is connected with the prefabricated support in a sliding manner and is parallel to the side wall support; the top cross beam is respectively connected with the side wall support and the bridge center support and is perpendicular to the side wall support. According to the embodiment of the utility model, the prefabricated support is additionally arranged, so that one layer of protection is added in the middle of the bridge body when the bridge body is connected, the bridge body can be repeatedly utilized, and the bridge body does not have too much loss. The side wall support and the bridge center support can linearly move on the prefabricated support, so that the position of the wind resistance device is adjusted, the influence on the stay cable and the work of constructors is effectively controlled, and the side wall support and the bridge center support are convenient to be connected with the top cross beam after the position of the side wall support and the bridge center support is changed, so that the flexibility is strong.

Description

Wind-resistant device and wind-resistant system of single-sided large cantilever cable-stayed bridge

Technical field

This application relates to the technical field of bridge construction. Specifically, this application relates to a wind-resistant device and wind-resistant system for a single-sided large cantilever cable-stayed bridge.

Background technique

The construction of highway bridges across valleys and rivers has gradually penetrated into the hilly areas of the central and western regions. Considering the difficulty of crossing the river, many road and bridge designers have adopted a single-sided large cantilever cable-stayed bridge plan with a central cable plane. With the increasing traffic volume, the bridge deck gradually develops in the direction of wider width. It is more economical and practical to use flat steel box girders for the main beams. Therefore, single-sided large cantilever flat section central cable-stayed bridges are used for valley cross-river highways. In the bridge.

The single-sided large cantilever cable-stayed bridge consists of 18 spans. During the construction process of each segment of the bridge span, a crane was used to pull it. After the construction was completed, the stay cables passing through the bridge tower were connected and placed at the center support of the corresponding bridge span. The stay cables during the construction process did not play the maximum load-bearing role. Therefore, the bridge resists deformation mainly through its own stiffness. At the same time, the length-to-width ratio and width-to-height ratio of the bridge have both reached 10:1, resulting in low transverse bending stiffness, weak vertical bending stiffness, and the central cable plane makes it poor in torsional resistance.

When the overhang of a bridge constructed in a valley is not large, its vertical bending stiffness and torsional stiffness are still sufficient. Even if the incoming wind velocity is high, workers working on the bridge deck will not feel the shaking or rotation of the bridge. However, when the construction progresses to the point where the main span has a large cantilever, the main span will have significant bending deformation under the load of its own mass and temperature, and its vertical bending stiffness and torsional stiffness are not enough to completely resist the deformation caused by gravity and temperature. Under the action of wind load, the vertical bending of the main span further increased, and the main span with stay cables placed in the center could not resist the greater torsion and deformed significantly. Once the wind speed reaches the design baseline wind speed or even higher, the vertical bending and torsion of the main span of the flat streamlined steel box girder will become more serious and complex, and static wind instability will occur. In extreme cases, it may even occur without warning. The main beam is broken. When the wind load continues to act on the cable-stayed bridge, its wind-induced vibration is continuously excited, and the periodic vibration amplitude of the main span of the bridge becomes larger and larger, causing flutter and galloping behaviors, which are the most common dynamic instability phenomena. This is It will seriously threaten the safety and security of construction machinery, facilities and on-site construction personnel.

Usually, when the main span of the steel box girder is hung on the tower column through stay cables, the static wind stability and dynamic stability of the bridge become an urgent problem for the construction personnel to solve. In order to improve the torsion resistance and vertical bending resistance of the bridge and prevent large-scale translation and rotation during the construction process, construction workers urgently need to install wind-resistant devices on the main span of the bridge. In the past, wind-resistant temporary piers were used during the construction of long-span bridges. Nowadays, new wind-proof nets, wind cables, or wind-resistant corbels connected to steel bridge columns are generally used for fixation to avoid losses.

When the existing new wind-resistant devices are used during the construction period of cable-stayed bridges, their function is more focused on preventing the bridge from moving. Although the designed wind-resistant devices are universal, they can only play a limited role in special bridges. Usually It will lead to the consumption of resource costs, the work effect is average, and the wind resistance stability during the construction period cannot be achieved. Especially for single-sided large cantilever flat section central cable-stayed bridges, which are increasingly used in mountainous areas, the construction itself It is difficult, requires higher design safety, and has a large impact from wind. Therefore, it is necessary to design and use a more efficient, economical and convenient device to solve the wind safety issues during the construction period of this type of bridge.

Utility model content

In view of the shortcomings of the existing methods, this application proposes a wind-resistant device and wind-resistant system for a single-sided large cantilever cable-stayed bridge to solve the existing technical problems of high construction difficulty, higher design safety requirements and interference from wind factors. Big technical problem.

The embodiment of the present application provides a wind-resistant device and wind-resistant system for a single-sided large cantilever cable-stayed bridge, including:

In the first aspect, embodiments of the present application provide a wind-resistant device for a single-sided large cantilever cable-stayed bridge, including:

Prefabricated bearings, connected to the bridge body;

The side support is slidingly connected to the prefabricated support, and the side support extends along the bridge direction;

The bridge center support is slidingly connected to the prefabricated support and parallel to the side support;

The top beam is connected to the side support and the bridge center support respectively, and is perpendicular to the side support.

In some embodiments of the present application, the prefabricated support has a plurality of mutually parallel limiting grooves, and both the side support and the bridge center support are partially located in the limiting grooves.

In some embodiments of the present application, at least one of the side supports, the top beam and the bridge center support adopts a lattice-type steel truss structure.

In some embodiments of the present application, the wind-resistant device further includes anchor bolts and chord bolts, and any one of the side supports and the bridge center support is connected to the bridge body through the anchor bolts. , and connected to the top beam through the chord bolts.

In some embodiments of the present application, at least one of the side supports, the bridge center support, and the top beam is provided with girders, and the outline of the girders is a quincunx shape.

In some embodiments of the present application, the wind-resistant device further includes a buckle, and any two of the side support, the bridge center support and the top beam are connected through the buckle.

In some embodiments of the present application, the wind-resistant device further includes a triangular member passing between one of the side supports and the bridge center support and one of the top beam and the prefabricated support. The triangle pieces are connected.

In some embodiments of the present application, the wind-resistant device includes two parallel side supports, one bridge center support located between the two side supports, and three side supports. The center of the bridge supports the top beams that are above and parallel to each other.

In some embodiments of the present application, at least one of the side supports, the bridge center support and the top beam is fixed with an air hook hole.

In the second aspect, embodiments of the present application provide a wind-resistant system for a single-sided large cantilever cable-stayed bridge, including a flat steel box girder bridge body and a plurality of wind-resistant devices described in any embodiment of the first aspect;

The wind-resistant devices are respectively located at the 1/4 span, 3/8 span and half span positions of the flat steel box girder bridge body.

The beneficial technical effects brought by the technical solutions provided by the embodiments of this application include: In the embodiment of this application, by adding prefabricated supports, the side supports and the bridge center support have an additional layer of protection in the middle when connecting the bridge body. After disassembly, The side supports and the bridge center support can still be reused many times, and the bridge body connected to the prefabricated bearings does not suffer much loss. The side supports and the bridge center support are slidingly connected to the prefabricated supports and can move linearly on the prefabricated supports to adjust the position of the wind-resistant device, effectively controlling the impact on the stay cables and the work of construction personnel, and facilitating the side supports. After the central support of the bridge changes its position, the connection with the top beam has strong flexibility.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

Figure 1 is a schematic structural diagram of a wind-resistant device for a single-sided large cantilever cable-stayed bridge provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of a side support and a bridge center support provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of a top beam provided by an embodiment of the present application;

Figure 4 is a schematic cross-sectional view of a side support and a bridge center support and their connection provided by an embodiment of the present application;

Figure 5 is a schematic cross-sectional view of a top beam provided by an embodiment of the present application;

Figure 6 is a schematic structural diagram of a prefabricated support provided by an embodiment of the present application.

Figure 7 is a schematic cross-sectional view of the triangle provided by the embodiment of the present application;

Figure 8 is a schematic structural diagram of the wind-resistant system of a single-sided large cantilever cable-stayed bridge provided by the embodiment of the present application;

Figure 9 is a schematic cross-sectional view of the wind-resistant system of a single-sided large cantilever cable-stayed bridge provided by an embodiment of the present application.

Markings in the picture:

1-side support; 2-bridge center support; 3-top beam; 4-upper chord; 5-lower chord;

6-female head; 7-male head; 8-oblique support rod; 9-vertical support rod; 10-U-shaped buckle;

11-Bailey pin; 12-truss piece; 13-channel steel; 14-prefabricated support; 15-fixed block;

16-limit block; 17-bolt; 18-limit slot; 19-screw hole;

20a-1/4 span; 20b-3/8 span; 20c-half span.

Detailed ways

The embodiments of the present application are described below with reference to the drawings in the present application. It should be understood that the embodiments described below in conjunction with the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application, and do not limit the technical solutions of the embodiments of the present application.

Those skilled in the art will understand that, unless expressly stated otherwise, the singular forms "a", "an", "the above" and "the" used herein may also include the plural form. It should be further understood that the word "comprising" used in the description of this application refers to the presence of the described features, integers, steps, operations, elements and/or components, but does not exclude the implementation of other features, information supported by the technical field. , data, steps, operations, elements, components and/or their combinations, etc. It should be understood that when we refer to an element being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or one element and the other element may be connected to the other element through intervening elements. Establish connections. Additionally, "connected" or "coupled" as used herein may include wireless connections or wireless couplings.

In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings. It should be noted that the following embodiments can be referred to, borrowed from, or combined with each other. The same terms, similar features, and similar implementation steps in different embodiments will not be repeatedly described.

The embodiment of the present application provides a wind-resistant device and wind-resistant system for a single-sided large cantilever cable-stayed bridge, including:

In the first aspect, embodiments of the present application provide a wind-resistant device for a single-sided large cantilever cable-stayed bridge, as shown in Figure 1 . Figure 1 illustrates a wind-resistant device for a single-sided large cantilever cable-stayed bridge provided by an embodiment of the present application. Structural diagram of the wind device. The wind-resistant device includes prefabricated supports 14, side supports 1, bridge center supports 2 and top beams 3:

Prefabricated bearing 14, connected with the bridge body;

The side support 1 is slidingly connected to the prefabricated support 14, and the side support 1 extends along the bridge direction;

The bridge center support 2 is slidingly connected to the prefabricated support 14 and parallel to the side support 1;

The top beam 3 is connected to the side support 1 and the bridge center support 2 respectively, and is perpendicular to the side support 1.

The prefabricated supports 14 added in the embodiment of the present application provide an additional layer of protection for the shell supports of the side supports 1 and the bridge center support 2 when connecting the bridge body. The shell plates can still be reused many times after being disassembled. , and at the same time, there is not much loss in the upper web of the steel box girder.

In some embodiments of the present application, the prefabricated support 14 has a plurality of mutually parallel limiting grooves 18 , and both the side support 1 and the bridge center support 2 are partially located in the limiting grooves 18 .

By designing the limiting groove 18 in the prefabricated support 14, the bottom of the side support 1 and the bridge center support 2 close to the ground is located in the limiting groove 18, and the Bailey piece can move linearly in the limiting groove 18. Adjusting the position of the wind-resistant device effectively controlled the impact on the stay cables and the work of construction personnel.

In some embodiments of the present application, the side support 1 and the top beam 3 include double-layer Bailey plates, the bridge center support 2 includes three layers of Bailey plates, and the wind-resistant device also includes bolts 17 , the bolts 17 include anchor bolts and chord bolts, and the Bailey plates of any one of the side support 1 and the bridge center support 2 are connected to the bridge body through the anchor bolts, and through the The chord bolts are connected to the top beam 3.

As shown in Figures 2-6, Figure 2 is a schematic structural diagram of a side support 1 and a bridge center support 2 provided by an embodiment of the present application; Figure 3 is a schematic structural diagram of a top beam 3 provided by an embodiment of the present application. ; Figure 4 is a schematic cross-sectional view of a side support 1 and a bridge center support 2 and their connections provided by an embodiment of the present application; Figure 5 is a schematic cross-sectional view of a top beam 3 provided by an embodiment of the present application; Figure 6 is a schematic cross-sectional view of the top beam 3 provided by an embodiment of the present application; The embodiment provides a schematic structural diagram of a prefabricated support 14.

For ease of introduction, in the above and following embodiments, the side support 1, the bridge center support 2 and the top beam 3 including Bailey plates are used as examples. In fact, the side support, the top beam and the bridge Other forms of lattice steel truss structures included in the central support are also within the scope of protection of this application.

In this embodiment, the side support 1 is a truss structure composed of double-layer shells, anchor bolts, chord bolts, etc. The shells are stacked side by side to form a height of not less than 3 meters and smaller than the adjacent slope. The support at the distance between the stay cable supports is located on the outermost side of the web on the steel box girder bridge deck.

The bridge center support 2 is a truss structure with a similar design structure to the side support 1. The length and height of the two are the same, and their placement is consistent along the bridge direction, but its basic unit component is a three-layer Bailey sheet, placed in the center between the cable surface supports.

The top beam 3 is composed of double-layer Bailey plates, chord bolts and buckles. There are three groups in total. They are erected on the side supports 1 and the bridge center support 2. Bolts 17 are inserted into the side supports from top to bottom. In the screw holes 19 of the chord bolts of the support 1 and bridge center support 2 truss groups, the curved backing plate of the bolt 17 is stuck in the chord, and the nuts are tightened. Among them, the chord bolts have the same shape as the truss bolts.

The side support 1, the bridge center support 2 and the top beam 3 are assembled and assembled with buckles to form a scaffolding structure, which is in the shape of a "door" along the bridge and in the shape of a "field" when viewed from above.

All the Bailey plates used are detachable and can be reused for other engineering needs, achieving economy, environmental protection and convenient transportation.

The prefabricated supports 14 of the upper web of the steel box girder of the main bridge are designed with screw holes 19 for grounding bolts according to the lower chords 5 of the side supports 1 and the bridge center support 2. They are consistent in size and aligned with the upper web through high Strength metal bolt 17 connections.

In some embodiments of the present application, the two ends of the Bailey piece of at least one of the side support 1, the bridge center support 2 and the top beam 3 respectively include a female head 6 and a male head 7, respectively. A Bailey pin 11 and at least one U-shaped buckle 10 are provided between two adjacent Bailey pieces. The Bailey pins 11 are connected to one of the female heads 6 and one of the male heads 7 respectively.

In this embodiment, the side supports 1 and the bridge center support 2 must use intact and consistent Bailey trusses 12. Each group of Bailey trusses along the bridge direction is provided with the required number of pieces on the male head 7, The female head 6 is connected through the Bailey pin 11, and the top beam 3 clamp is additionally provided with 3 U-shaped buckles 10 to connect the longitudinally adjacent Bailey pieces, and along the bridge height direction, it is supported through the screw hole 19 of the lower chord 5 of the upper Bailey piece. The hole is connected to the screw hole 19 and the support hole of the upper chord bar 4 of the Bailey plate below. Do not place any steel plates in the diagonal rod and vertical rod areas to prevent additional wind resistance from the bridge deck. The Bailey plate and the Bailey plate are at the connection position of the diagonal brace. Use No. 14 b channel steel 13 connectors to ensure that the diagonal braces and parallel bolts 17 are tightened in place.

The upper and lower baileys of the side support 1 are connected through the upper chord 4 and the lower chord 5, and the two are fixed in parallel by bolts 17.

The left and right bailey plates of the side support 1 overlap at the female head 6 and the male head 7, a bailey pin 11 is inserted into the pin hole, and three sets of U-shaped buckles 10 are provided at the clamp of the top beam 3 of the bailey piece to strengthen the phase. o-Bele connection.

One end of the diagonal brace 8 and the vertical brace 9 of the side support 1 is welded to the upper or lower line pole, and the other end is evenly welded to the reinforcement plate. The reinforcement plate is connected to the front and rear layers through No. 14 channel steel 13. Bailey's piece;

A row of pin holes is added at the connection points between the vertical strut 9 of the side support 1 and the upper chord 4 and the lower chord 5, and Bailey pins 11 are inserted into the holes for connection.

The bridge center support 2 also uses bolts 17 to connect the upper chord 4 and the lower chord 5, and uses Bailey pins 11 to connect the female ends 6 and male heads 7 of the side-by-side Bailey pieces. The top beam 3 clamp uses U-shaped buckles 10 to strengthen the side-by-side bellows. The mine blades are connected, and the reinforcement plate connects the front and rear three layers of mine blades through two sets of No. 14 channel steel 13.

In some embodiments of the present application, girders 12 are provided in the Bailey plates of at least one of the side support 1 , the bridge center support 2 and the top beam 3 , and the profile of the girders 12 It is plum blossom shape.

In another embodiment, the top beam 3 is also connected through Bailey pins 11 and U-shaped buckles 10 according to the required number of pieces, and the positioning and steering of the wind rope are used to make the top direction perpendicular to the bridge body. Truss pieces 12 are installed in between, among which the top beam 3 in the middle of the top is installed with one piece every 1.5m, and two pieces are installed every 1.5m on both sides. They are arranged in a plum blossom shape to make the beams become a whole.

Take the top beam 3 having a truss 12 as an example. Compared with the structure of the side support 1, the top beam 3 mainly has an additional reinforced truss 12 composed of a ring and a cross bar welded in the diagonal brace 8 and the vertical brace 9. , designed according to the plum blossom shape, used to improve the local stiffness of the wind-resistant device in the lateral direction.

The lower chords 5 of the side support 1 and the bridge center support 2 are installed into the grooves in the prefabricated supports 14, and the relative positions of the side support 1 and the bridge center support 2 are adjusted by linear sliding.

In some embodiments of the present application, the wind-resistant device also includes a buckle, and any two of the side support 1, the bridge center support 2 and the top beam 3 are connected through the buckle. .

In some embodiments of the present application, the wind-resistant device further includes a triangular member, one of the side supports 1 and the bridge center support 2 and one of the top beam 3 and the prefabricated support 14 They are connected through the triangle piece.

As shown in Figure 7, Figure 7 is a schematic cross-sectional view of the triangular component provided by the embodiment of the present application.

The side supports 1, the bridge center support 2, the top beam 3, and the prefabricated supports 14 are all made of metal. Any two of the above components and between the prefabricated supports 14 and the upper web can be connected through a reinforced triangle. bolted connections.

In some embodiments of the present application, the wind-resistant device includes two side supports 1 parallel to each other, one bridge center support 2 located between the two side supports 1 and three center supports 2 located between the two side supports 1. The side support 1 and the top crossbeam 3 are above and parallel to each other and above the bridge center support 2.

The wind-resistant device has two side supports 1, a bridge center support 2 and three top beams 3, all of which are truss structures composed of Bailey plates, which are used to improve the vertical bending resistance and horizontal bending resistance along the bridge direction. The torsional resistance of the bridge direction, the side support 1, the bridge center support 2 and the top beam 3 are connected with the bridge body as a whole, thereby ensuring that the construction process of the single-sided large cantilever flat section center cable-stayed cable-stayed bridge meets the static wind stability at the same time and flutter stability design requirements.

When the side supports 1 on both sides of the bridge are connected to the prefabricated supports 14 prefabricated on the upper web of the bridge steel box through anchor bolts, the bridge center support 2 is connected to the prefabricated supports 14 on the upper web using the same scheme to ensure During the construction process, the double-layer shells of the side support 1 and the three-layer shells of the bridge center support 2 were aligned.

Then hang the first set of top beams 3 on the side supports 1 and the bridge center support 2. The top beams 3 span the three rows of supports and install them to one end of the side supports 1 and the bridge center support 2 close to the center line. and tighten to ensure the three are firmly bound.

Continue to hang the second set of top beams 3 on the side supports 1 and the bridge center support 2, and install them at the center line of the side supports 1 and the bridge center support 2. Repeat this operation again, and hoist the last set of top beams 3 on the other ends of the side supports 1 and the bridge center support 2, close to the center line.

Optionally, the prefabricated support 14 is in a groove shape, and screw holes 19 are left on the inner groove surfaces of the two side supports and both sides of the middle support to facilitate the reinforcement of the triangle between the upper web and the support. connect.

Optionally, the groove of the prefabricated support 14 is provided with a limiting block 16, a fixing block 15, and a connecting piece. The connectors include bolts 17, bayonet pins, limit blocks 16, fixed blocks 15, bolts 17, and bayonet pins. They can also move linearly in the limit slot 18 to facilitate the connection of the top beam 3 after the support changes position, and are flexible. It has strong performance and can install support plates and support frames. When the side support 1 and the bridge center support 2 are aligned with each other, use the limit block 16 to resist the ends of the side support 1 and the bridge center support 2 to prevent the side support 1 and the bridge center support 2 from sliding out of the groove. and deflection to facilitate the alignment of the screw holes 19 at the connection; after checking that the screw holes 19 of the prefabricated support 14 are all aligned with the screw holes 19 of the side support 1 and the bridge center support 2, put the bolt 17 through the screw hole 19 until Drill into the upper web of the steel box girder; after fully tightening the grounding bolts 17 between the prefabricated support 14 and the lower chord 5, wedge the fixing block 15 into the groove against the limit block 16, and Then nail the grounding bolt 17 into the back to strengthen the fixing block 15; after the side support 1 and the bridge center support 2 are successfully installed into the prefabricated support 14, first hoist the top beam 3 at the center position of the side support 1 and the bridge center support 2 .

Optionally, the rackets of the side supports 1, the bridge center support 2 and the top beam 3 are all provided with U-shaped buckles 10 and racket pins 11, making it easier for users to assemble adjacent rackets.

Optionally, the vertical center lines of the side support 1, the bridge center support 2 and the vertical center line of the top beam 3 are on the same vertical line, which optimizes the structure of the device and improves the stability of the device.

Optionally, the side supports 1, the bridge center support 2, and the top beam 3 are all fixed with wind hook holes, which can be used to strengthen the fixation of windproof ropes to anti-wind devices. Use the wind hook hole of the top beam 33 to install the wind rope for positioning, turn the top to be perpendicular to the bridge body, and pass through the wind hook hole of the upper chord 44 of the side support 11 and the bridge center support 22 to achieve a preliminary connection between the two. ; Align the screw holes 19 of the upper chord 4 of the side support 1 and the bridge center support 2 with the screw holes 19 of the lower chord 5 of the top beam 3, and strengthen the connection between the two through bolts 17, in which the three-layer shell of the bridge center support 2 The mine room is connected to the top beam 3 with only a set of bolts 17; a longitudinal reinforcing plate is welded on the upper chord 4 of the mine inside the side support 1 and the diagonal brace 8 or the vertical brace 9, and a longitudinal reinforcing plate is welded to the bottom top beam 3. Weld a transverse reinforcing plate to the lower chord 5 and diagonal brace 8 or vertical brace 9 of the inner Bailey piece. Strengthen the fixation of the side support 1 and the top beam 3 through the screw holes 19 and bolts 17 on the triangular piece, and then Strengthen the triangular connection between the bridge center support 2 and the bottom top beam 3; the other two sets of top beams 3, the side supports 1 and the bridge center support 2 are again fixedly connected with the air hook holes, and the upper chord 4 and the lower chord are used The bolt 17 connection of 5 and the reinforced connection of the triangular piece realize the connection between the remaining support and the top beam 3.

Optionally, the side supports 1, the bridge center support 2, and the top beam 3 need to be retained before the main span and side span of the bridge are closed, until the end of the project.

Optionally, the length and height of the side supports 1 and the bridge center support 2 should avoid the stay cables, while providing a smooth channel for manual work and transportation.

In the second aspect, embodiments of the present application provide a wind-resistant system for a single-sided large cantilever cable-stayed bridge, including a flat steel box girder bridge body and a plurality of wind-resistant devices described in any embodiment of the first aspect;

The wind-resistant devices are respectively located at the 1/4 span 20a, 3/8 span 20b and half span 20c of the flat steel box girder bridge.

As shown in Figures 8 and 9, Figure 8 is a schematic structural diagram of the wind-resistant system of a single-sided large cantilever cable-stayed bridge provided by an embodiment of the present application; Figure 9 is a schematic diagram of a single-sided large cantilever cable-stayed bridge provided by an embodiment of the present application. Schematic cross-section of the wind-resistant system of a cable-stayed bridge. Figure 9 is a cross-sectional view along A-A' in Figure 8 .

In this embodiment, the main bridge has a total length of 328m and is a (90+238)m single tower, leaning tower, central cable plane, and steel-concrete hybrid beam cable-stayed bridge. The main span of the cable-stayed bridge is a single-sided large cantilever, which crosses the river in one span to meet navigation and flood control requirements. The main beam adopts a cantilevered inclined web box section with a large angle. The side span uses integral cross-section prestressed concrete box girders, and the main span adopts integral cross-section flat steel box girders, which are partially connected and filled with ultra-high performance concrete (UHPC). In the center suspension of the segment, there are a total of 68 parallel steel wire stay cables in 5 specifications across the bridge.

Buffet analysis of long-span bridges is carried out through theoretical analysis, wind tunnel tests, on-site measurements and numerical simulations. During the construction process of the bridge, a trough-shaped structure with a gradually extending width is formed, and the incompressible viscous fluid in the trough produces Poiseuille flow under the action of the pressure gradient. When the groove width is constant, the greater the pressure gradient, the greater the fluid flow rate; when the pressure gradient is constant, the greater the groove width, the greater the fluid's influence range and the greater the maximum flow rate.

It can be seen that the bridge in the center of the canyon is subject to greater wind effects. Therefore, when the bridge is built to its full span, the wind speed of 20c at 1/2 span is the highest. In the same way, when the bridge is built to 3/4 span, the wind speed at 20b at 3/8 span is the highest; when the bridge is built at 20c at 1/2 span, the wind speed at 20a at 1/4 span is the largest.

Multiple wind speed observation layers are evenly arranged in the canyon cross section along the height direction of the canyon. Each observation layer arranges a wind speed observation point at certain intervals from the middle of the valley to the mountains on both sides.

The airflow at each observation point in the canyon is compressed to different degrees. The friction decreases rapidly from the mountain close to the valley. The wind speed in the canyon increases rapidly from the mountain close to the valley center. When it reaches a certain distance, the friction becomes very small. However, the compression effect of the canyon is still relatively strong, so the wind speed reaches a maximum value; beyond this distance and moving toward the center of the valley, the wind speed begins to decrease because the compression effect decreases rapidly. The wind speed at the same height in the canyon shows a parabolic change that first increases rapidly and then decreases slowly from the mountains on both sides to the valley. That is, the wind speed in the center of the canyon is close to the maximum value.

In summary, in order to reduce the wind impact on the bridge, it is necessary to strengthen the stiffness of the 1/2 span 20c, 3/8 span 20b and 1/4 span 20a. Choose to install wind-resistant devices at 1/4 span 20a, 3/8 span 20b and half-span 20c of the flat steel box girder bridge to improve the wind resistance system composed of the flat steel box girder bridge body and wind resistant devices wind resistance.

Compared with the existing technology, the application of the embodiments of the present application can achieve at least the following beneficial effects: The additional prefabricated supports 14 in the embodiments of the present application provide an additional layer of protection in the middle of the Bailey support when connecting the bridge body. , the Bailey sheet can still be reused many times after disassembly, and the upper web of the steel box girder does not suffer much loss. Through the designed prefabricated support 14, the Bailey plate support can move linearly in the groove, and the position of the wind-resistant device can be adjusted, effectively controlling the impact on the stay cable and the work of the construction personnel. At the same time, the limit block 16 is fixed The movement of the block 15, the bolt 17, and the bayonet in the limiting groove 18 facilitates the connection of the top beam 3 after the support changes its position. It is highly flexible and can install the support plate and the support frame.

The additional triangular parts in the embodiment of the present application enable the support to be stably connected to the top beam 3 and the upper web, which increases the stability of the upper and lower ends of the wind-resistant device, improves the efficiency of installation, does not require the use of corresponding tools, and simplifies the operating steps. . Through the designed connectors, the lateral sway of the support and top beam 3 is effectively avoided, which is conducive to improving the local stiffness of the main span in the potentially dangerous area.

The added U-shaped buckle 10 in the embodiment of the present application can effectively improve the tensile strength of the wind-resistant device, and at the same time, the adjacent bailey pins 11 can ensure a certain compression resistance. Combined with the No. 14b channel steel 13, the shells of different layers are connected. The bolts increase the overall strength and shear load-bearing performance of the bolts. Therefore, when it is necessary to replace the bolts, the support can be squeezed or pulled toward one end of the bolts, and the other end of the bolts can be Take it out, and then you can remove the Bailey plate for replacement, which is more convenient. Secondly, the additional triangular piece and the fixing block 15 can limit the position of the Bailey plate after it is inserted into the support to prevent it from sliding at will.

In the description of this application, the words "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", " The directions or positional relationships indicated by "bottom", "inner", "outer", etc. are based on the exemplary directions or positional relationships shown in the drawings, and are for convenience of describing or simplifying the description of the embodiments of the present application, rather than indicating or It is implied that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore is not to be construed as a limitation on the application.

The terms “first” and “second” are used for descriptive purposes only and shall not be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of this application, unless otherwise stated, "plurality" means two or more.

In the description of this application, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be directly connected, or indirectly connected through an intermediary, or it can be internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood on a case-by-case basis.

In the description of this specification, specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above are only some implementations of the present application. It should be pointed out that for those of ordinary skill in the technical field, other similar implementation means based on the technical ideas of the present application may be adopted without departing from the technical concept of the present application. , also belongs to the protection scope of the embodiments of this application.

Claims (10)

1. The utility model provides a unilateral large cantilever cable-stay bridge's anti wind device which characterized in that includes:

the prefabricated support is connected with the bridge body;

the side wall support is connected with the prefabricated support in a sliding manner and extends along the forward bridge direction;

the bridge center support is connected with the prefabricated support in a sliding manner and is parallel to the side wall support;

and the top cross beam is respectively connected with the side wall support and the bridge center support and is perpendicular to the side wall support.

2. The wind-resistant unit of a single-sided large cantilever cable-stayed bridge according to claim 1, wherein the prefabricated support has a plurality of limit grooves parallel to each other, and the side wall supports and the bridge center support are both partially located in the limit grooves.

3. The wind-resistant apparatus of a single-sided large cantilever cable-stayed bridge according to claim 1, wherein at least one of the side wall support, the top cross member and the bridge center support adopts a lattice type steel truss structure.

4. A wind-resistant unit for a single-sided large cantilever cable-stayed bridge according to claim 3, further comprising anchor bolts and chord bolts, wherein either of the side wall support and the bridge center support is connected to the bridge body by the anchor bolts and to the top cross member by the chord bolts.

5. A wind-resistant unit for a single-sided large cantilever cable-stayed bridge according to claim 3, wherein at least one of the side wall support, the bridge center support and the top cross member is provided with truss sheets, the truss sheets having a quincuncial profile.

6. The wind-resistant apparatus of a single-sided large cantilever cable-stayed bridge according to claim 1, further comprising a buckle, wherein any two of the side wall support, the bridge center support and the top cross member are connected by the buckle.

7. The wind-resistant device of a single-sided large cantilever cable-stayed bridge according to claim 1, further comprising a triangle, wherein one of the side wall support and the bridge center support is connected to one of the top beam and the prefabricated support by the triangle.

8. A wind-resistant unit for a single-sided large cantilever cable-stayed bridge according to claim 1, comprising two side-wall supports parallel to each other, one bridge center support located between two side-wall supports and three top girders parallel to each other above the side-wall supports and the bridge center support.

9. The wind-resistant apparatus of a single-sided large cantilever cable-stayed bridge according to claim 1, wherein at least one of the side wall support, the bridge center support and the top cross member is fixed with a wind hook hole.

10. A wind-resistant system of a single-side large cantilever cable-stayed bridge, characterized by comprising a flat steel box girder bridge body and a plurality of wind-resistant devices according to any one of claims 1-9;

the wind resistance devices are respectively positioned at the 1/4 span, the 3/8 span and the half span positions of the flat steel box girder bridge body.