CN111809501A

CN111809501A - Arched bent suspension bridge structure

Info

Publication number: CN111809501A
Application number: CN202010832980.7A
Authority: CN
Inventors: 侯旭; 冯云成; 翟晓亮; 杨雨豪; 郭聪敏; 樊冰冰; 何磊
Original assignee: CCCC First Highway Consultants Co Ltd
Current assignee: CCCC First Highway Consultants Co Ltd
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2020-10-23
Also published as: CN113430909A

Abstract

The invention relates to an arched bent frame suspension bridge structure which comprises a longitudinal main beam, wherein a plurality of groups of transverse and parallel arch ribs are arranged above the main beam and cross the main beam, and vertical suspension cables are arranged between the arch ribs and the main beam. Compared with a continuous beam adopting portal piers, the invention replaces the portal piers with arch ribs, and has better landscape; the support form of suspending by the sling replaces the support, reduces the building height of the main beam and solves the problem of insufficient clearance under the bridge. Compared with a cable-stayed bridge, the main span is reduced, and the manufacturing cost is reduced; the arrangement is flexible, and the device is more suitable for the plane curve line shape at the bridge position; meanwhile, the invention also provides a choice of crossing the existing road at a small angle for route design, and is a bridge structure with stronger applicability.

Description

Arched bent suspension bridge structure

Technical Field

The invention belongs to the technical field of bridge engineering, and particularly relates to an arched bent frame suspension bridge structure.

Background

With the continuous advance of urbanization, the demand of capacity expansion of the existing roads is increasing day by day, and the three-dimensional capacity expansion transformation of the urban roads becomes the most direct and effective method for solving the road congestion in deep urbanized areas. In the process of three-dimensional reconstruction and extension, a ground layer bridge is often limited by terrain, ground objects and the like and needs to repeatedly cross over a ground layer road, and in order to ensure that the line type is smooth, the three-dimensional layer bridge often needs a small included angle to cross over a bottom layer. In this case, it is difficult to install the ground layer road pier due to the restriction of the need for ensuring the continuity and safety of the ground layer road.

Aiming at the difficult problem of crossing ground layer roads by a three-dimensional layer bridge at a small included angle, the conventional solution is to adopt a portal pier to span in a small span or adopt a cable-stayed bridge to span in a large span. The continuous beam adopting the portal pier has the defects of high difficulty in construction and poor landscape, and meanwhile, as the height of the beam increases along with the increase of the span, a high line needs to be adjusted to ensure the clearance under the bridge, so that the construction cost is increased; the large-span cable-stayed bridge has the problems that a main beam cannot be well adapted to the plane line shape of a bridge position, the stress is complex, the economical efficiency is poor, a high-rise bridge tower is not coordinated with the surrounding environment and the like.

In summary, conventional solutions have certain limitations in the case of a three-dimensional layer bridge crossing a ground layer road at a small included angle, and a bridge structure which is practical and has a landscape is urgently needed as a solution.

Disclosure of Invention

The invention aims to provide an arched bent suspension bridge structure, which solves the problem of small included angle crossing between a three-dimensional layer and a ground layer road in a reconstruction and extension project, realizes the unification of functions and landscapes, has novel structural form and enriches the selection of bridge structures.

The technical scheme adopted by the invention is as follows:

bridge structures is suspended in midair to arch framed bent, its characterized in that:

the structure comprises a longitudinal main beam, a plurality of groups of transverse and mutually parallel arch ribs are arranged above the main beam and span the main beam, and vertical slings are arranged between the arch ribs and the main beam.

The arch rib comprises three arc-shaped arch frames, the middle arch frame is vertical, the arch frames on two sides incline outwards, and a plurality of ribs are arranged between the adjacent arch frames.

The arch rib comprises two arc-shaped arch frames, the two arch frames are vertical or inclined outwards, and a plurality of ribs are arranged between the two arch frames.

The arch rib comprises two arc-shaped arch frames, one arch frame is vertical, the other arch frame inclines outwards, and a plurality of ribs are arranged between the two arch frames.

A plurality of longitudinal vertical struts are arranged between two groups of arch ribs which are longitudinally adjacent, and two ends of each vertical strut are connected to the arch frames on the sides of the arch ribs.

The bottom ends of the two sides of each arch rib are fixed on the arch base below the two sides of the main beam, and the arch center of each group of arch ribs shares the same arch base.

The top ends of the suspension cables are fixed on the arch center of the arch rib, and the bottom ends of the suspension cables are fixed on the two side edges of the main beam.

The arch frame, ribs and longitudinal support of the arch rib are square steel pipes, round steel pipes or I-shaped steel.

Concrete is poured into the inner part of the arch rib, and the pouring position is 1/5-1/3 from the arch springing position to the height of the arch rib.

The main beam is supported by the side pier or the side pier and the auxiliary pier below.

The invention has the following advantages:

compared with the conventional bridge type scheme that a three-dimensional layer bridge spans a ground layer road at a small included angle, the bridge type pier has the advantages that the height of a main beam is lower than that of a continuous beam adopting a portal pier, and the problem of insufficient clearance below a bridge is solved; compared with a main span of a cable-stayed bridge, the cable-stayed bridge has the advantages of small span, low manufacturing cost and flexible arrangement, and is more suitable for the plane curve line shape at the bridge position.

The invention has stronger adaptability to the width of the bridge deck, and the number of the cable surfaces can be selected according to the transverse width of the main beam from a single cable surface to a multi-cable surface without adding additional tower columns.

The load is distributed to the plurality of arch seats, the single foundation is small in scale, the occupied area is small, and large-scale excavation is not needed.

And fourthly, the arch support, the auxiliary pier and the transition pier are arranged on two sides of the ground layer road, and the ground layer road is divided into zones without piers, so that the arch support, the auxiliary pier and the transition pier are beneficial to the traffic protection and the driving safety of the ground layer road during construction.

The invention has unique shape, distinct level, strong personalized design and aesthetic design innovation space, and good landscape effect.

Drawings

FIG. 1 is a schematic view of the overall arrangement of embodiment 1 of the present invention;

FIG. 2 is a side view of example 1 of the present invention;

FIG. 3 is a plan view of example 1 of the present invention;

FIG. 4 is a plan view of example 3 of the present invention;

in the figure, 1-arch rib, 2-main beam, 3-sling, 4-arch foundation, 5-longitudinal support, 6-side pier and 7-auxiliary pier.

Detailed Description

The present invention will be described in detail with reference to specific embodiments.

The invention relates to an arched bent suspension bridge structure, which comprises a longitudinal main beam 2, wherein the main beam 2 is supported by a side pier 6 or the side pier 6 and an auxiliary pier 7 below the main beam. A plurality of groups of transverse and mutually parallel arch ribs 1 are arranged above the main beam 2 and span the main beam 2, and vertical slings 3 are arranged between the arch ribs 1 and the main beam 2.

The arch rib 1 comprises three arc-shaped arch frames, the middle arch frame is vertical, the arch frames on two sides incline outwards, and a plurality of ribs are arranged between the adjacent arch frames. Such as the centrally located rib 1 in fig. 2.

The arch rib 1 may also comprise two arc-shaped arches, wherein the two arches are vertical or inclined outwards, and a plurality of ribs are arranged between the two arches. Such as rib 1 in fig. 4.

The arch rib 1 can also comprise two arc-shaped arch frames, one arch frame is plumbed, the other arch frame is inclined outwards, and a plurality of ribs are arranged between the two arch frames. Such as the rib 1 at the edge in fig. 2.

A plurality of longitudinal vertical struts 5 are arranged between two groups of arch ribs 1 which are longitudinally adjacent, and two ends of each vertical strut 5 are connected to the arch center at the side of each arch rib 1.

The bottom ends of two sides of the arch rib 1 are fixed on the arch base 4 below two sides of the main beam 2, and the arch center of each group of arch ribs 1 shares the same arch base 4.

The top ends of the suspension cables 3 are fixed on the arch center of the arch rib 1, and the bottom ends are fixed on the two side edges of the main beam 2.

The arch center and the ribs of the arch rib 1 are square steel pipes or round steel pipes, and the longitudinal support 5 is a square steel pipe, a round steel pipe or an I-shaped section.

Concrete is poured into the inner parts of the arch frame and the ribs of the arch rib 1, and the pouring position is 1/5-1/3 from the arch springing position to the height of the arch rib.

Referring to the attached drawings 1-4, in the structure of the invention, a plurality of groups of arch ribs 1 transversely span a ground layer road, the arch ribs 1 are connected by longitudinal struts 5 to form an arch bent, and a main beam 2 passes through the lower part of the arch bent and is suspended on the arch bent through a sling 3. The arch support bases 4 are respectively positioned at two sides of a ground layer road, and two sides of the arch rib 1 are respectively anchored on the arch support bases 4. Two ends of the main beam 2 are supported on the side piers 6, and a plurality of auxiliary piers 7 can be arranged to support the main beam 2 in an auxiliary manner according to the stress requirement.

The number of the arch ribs 1 is determined according to the span of the main beam and the distance between the arch ribs 1, and each group of the arch ribs 1 can be arranged in parallel or in a certain angle according to the linear requirement of the design line of the bridge; according to the structural stress requirement, each group of arch ribs 1 share one group of arch base 4.

The arrangement form and the number of the longitudinal supports 5 can be set according to the stress and the landscape requirements. As the number of the arch ribs 1 increases, the temperature load effect is increased, and the temperature load effect can be reduced by arranging the telescopic vertical supports 5 or not arranging the vertical supports 5 between one group or a plurality of groups of adjacent arch ribs 1 and dividing the arched bent into two or more relatively independent parts in the longitudinal direction.

One end of the sling 3 is anchored on the main beam 2. The central single cable surface, the two cable surfaces at the two sides or the combination of the two can be arranged according to the lane arrangement of the main beam 2. The other end of the sling 3 is anchored on the arch rib 1. Arranging a corresponding number of hoisting points on the arch rib 1 according to the number of the cable surfaces along the axial direction of the arch rib 1; along the longitudinal direction of the main beam 2, the positions of the lifting points can be arranged according to the stress and landscape requirements, so that the suspension ropes 3 are arranged vertically or obliquely.

The invention has the following different structural forms:

example 1:

fig. 1 is a perspective view of a main structure of embodiment 1, fig. 2 is a side view of the main structure of embodiment 1, and fig. 3 is a plane of the main structure of embodiment 1, and the embodiment is composed of an arch rib 1, a main beam 2, a sling 3, an arch base 4, a longitudinal support 5, a side pier 6 and an auxiliary pier 7.

The arch rib 1 adopts an all-steel structure and a rectangular section, and transversely spans the existing road of the ground layer road. The three-way arch is a group of arch ribs 1, the end part of the three-way arch is a group of arch ribs 1 consisting of two-way arch, the middle arch is vertical, and the two-way arch is inclined outwards at a certain angle. Each group of arch ribs 1 share one group of arch base 4, and the arch base 4 is respectively positioned at two sides of a road sideline of a ground layer. And a plurality of groups of the arches are arranged along the longitudinal bridge direction of the main beam 2. The longitudinal supports 5 are rectangular in cross section, a plurality of longitudinal supports are arranged along the arch axis of the arch rib, and all groups of arch ribs 1 are connected into an arch bent, so that the integral stability of the structure is enhanced. In order to reduce the temperature effect of the structure, the arch bent is divided into a plurality of parts in the longitudinal direction, and the longitudinal support 5 is not arranged between the parts or the longitudinal support 5 is arranged in a telescopic way. The main beam 2 is a flat steel box beam and is connected with the arch ribs 1 through slings 3 at two sides, and each arch rib 1 is provided with two lifting points. The design line of the main beam 2 is positioned on the small radius curve and the relaxation curve, and the arch axis line shape of the arch rib 1 is adjusted to avoid the short length of the sling 3. After the main beam 2 crosses the road of the ground layer, two ends of the main beam are supported on the side piers 6, and in order to improve the stress of the main beam 2 and the side sling, an auxiliary pier 7 is arranged between the side sling and the side pier 6. The side piers 6 and the auxiliary piers 7 are arranged on the outer side of the road of the ground layer.

In practical application, the materials, the line shapes and the section sizes of the arch rib 1, the main beam 2, the sling 3, the arch support foundation 4, the longitudinal support 5, the side pier 6 and the auxiliary pier 7 can be selected according to stress and landscape requirements, and the transverse span and the longitudinal distance of the arch rib 1, the number of pieces and the arrangement form, the arrangement of the longitudinal support 5, the arrangement of the sling 3 and the like can be adjusted according to bridge position characteristics and structural stress requirements.

Example 2:

in the embodiment, the arch rib 1 in the embodiment 1 is changed into two arches in each group, and the two arches are respectively inclined towards two sides and are connected by the longitudinal support 5. The rest of the construction was the same as in example 1.

Example 3:

FIG. 4 is a plan view of the main structure of example 3, and the system is composed of arch ribs 1, main beams 2, slings 3, arch base 4, longitudinal supports 5 and side piers 6.

The arch rib 1 adopts a circular steel pipe section, the two arch frames are arranged in parallel and connected by a plurality of longitudinal supports 5, and the longitudinal supports 5 adopt circular steel pipe sections. The two arches share one set of arch foundation 4, the arch foundation 4 is respectively positioned at two sides of a road sideline of a ground layer, and the arch rib 1 transversely spans the road of the ground layer. The arches are arranged along the road route direction of the ground layer, wherein the middle groups are arranged in parallel, and the middle groups and the front group of arches are arranged at a certain included angle so as to adapt to the plane line shape of the main beam. The arch groups are connected by a plurality of longitudinal supports 5 to connect the arch ribs 1 into a whole. The main beam 2 is a steel plate combination beam, three beams are transversely arranged, each steel plate beam is connected with an arch rib 1 through a sling 3, and three lifting points are arranged on each arch rib 1. The main beam 2 spans the ground layer road, and two ends of the main beam are supported on the side piers 6. The side piers 6 are arranged on the outer side of the ground layer road, and no interference is generated on the ground layer road in the construction stage and the operation stage.

In practical application, the materials, the line shapes and the section sizes of the arch rib 1, the main beam 2, the sling 3, the arch support foundation 4, the longitudinal support 5 and the side pier 6 can be selected preferably according to stress and landscape requirements, and the transverse span and the longitudinal distance of the arch rib 1, the number and the arrangement form of the pieces, the arrangement of the longitudinal support 5, the arrangement of the sling 3 and the like can be adjusted according to bridge position characteristics and structural stress requirements.

Example 4:

in the embodiment, concrete is partially poured into the arch rib 1 in the embodiment 1, the concrete is C40-C80 micro-expansion concrete, and the pouring position is 1/5-1/3 from the arch foot to the height of the arch rib. The rest of the construction was the same as in example 1.

Example 5:

in the embodiment, concrete is poured into the part of the arch rib 1 in the embodiment 2, the concrete is C40-C80 micro-expansion concrete, and the pouring position is 1/5-1/3 from the arch foot to the height of the arch rib. The rest of the construction was the same as in example 2.

Example 6:

in the embodiment, concrete is partially poured into the arch rib 1 in the embodiment 3, the concrete is C40-C80 micro-expansion concrete, and the pouring position is 1/5-1/3 from the arch foot to the height of the arch rib. The rest of the construction was the same as in example 3.

The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.

Claims

1. Bridge structures is suspended in midair to arch framed bent, its characterized in that:

the structure comprises a longitudinal main beam (2), a plurality of groups of transverse and parallel arch ribs (1) are arranged above the main beam (2) and span the main beam (2), and vertical slings (3) are arranged between the arch ribs (1) and the main beam (2).

2. The arched bent suspended bridge structure according to claim 1, wherein:

the arch rib (1) comprises three arc-shaped arch frames, the middle arch frame is vertical, the arch frames on two sides incline outwards, and a plurality of ribs are arranged between the adjacent arch frames.

3. The arched bent suspended bridge structure according to claim 1, wherein:

the arch rib (1) comprises two arc-shaped arch frames, the two arch frames are vertical or inclined outwards, and a plurality of ribs are arranged between the two arch frames.

4. The arched bent suspended bridge structure according to claim 1, wherein:

the arch rib (1) comprises two arc-shaped arch frames, one arch frame is vertical, the other arch frame is inclined outwards, and a plurality of ribs are arranged between the two arch frames.

5. An arched bent suspended bridge structure according to claim 2, 3 or 4, wherein:

a plurality of longitudinal vertical struts (5) are arranged between two groups of arch ribs (1) which are adjacent in the longitudinal direction, and two ends of each vertical strut (5) are connected to the arch center at the side of each arch rib (1).

6. The arched bent suspended bridge structure according to claim 5, wherein:

the bottom ends of the two sides of each arch rib (1) are fixed on the arch base (4) below the two sides of the main beam (2), and the arch center of each group of arch ribs (1) shares the same arch base (4).

7. The arched bent suspended bridge structure according to claim 6, wherein:

the top ends of the suspension cables (3) are fixed on the arch center of the arch rib (1), and the bottom ends are fixed on the edges of the two sides of the main beam (2).

8. The arched bent suspended bridge structure according to claim 7, wherein:

the arch center, the ribs and the longitudinal supports (5) of the arch rib (1) are square steel pipes, round steel pipes or I-shaped steel.

9. The arched bent suspended bridge structure according to claim 8, wherein:

concrete is poured into the inner part of the arch rib (1), and the pouring position is 1/5-1/3 from the arch springing position to the height of the arch rib.

10. The arched bent suspended bridge structure according to claim 9, wherein:

the main beam (2) is supported by the side pier (6) or the side pier (6) and the auxiliary pier (7) below.