CN104452574B - A kind of ramp bridge structure and construction method thereof - Google Patents

Abstract

A kind of ramp bridge structure of the present invention and construction method thereof, it is mainly made up of curvilinear cross skew curve shape steel case beam, Sarasota, suspension cable, only post bridge pier, Integral Abutment, disc type anchor, pin, ears plate, screw shell, monaural plate. Advantage: the one, adopt shaped form steel box girder, there is good torsional property, and alleviate dead load. The 2nd, beam body section adopts asymmetric section form, and superstructure load, by bridge pier and drag-line shared, in not increasing only post bridge pier quantity, has been avoided the overturning of superstructure. The 3rd, utilize the horizontal component that carrys out balance suspension cable without dorsal funciculus leaning tower, reduce moment of flexure in Sarasota. The 4th, adopt Integral Abutment, this provides reliable antitorque support for shaped form steel case beam, has improved durability and the driving comfort level of ramp bridge. This structure is applicable to the design of most expressway ramp bridges, and structure stress is reliable.

Description

A kind of ramp bridge structure and construction method thereof

Technical field

The present invention is a kind of highway ramp bridge form, belongs to civil engineering bridge field.

Background technology

Ramp bridge refers to a bit of attached bridge that vehicles while passing backbone (highway, overpass, arterial highway etc.) are provided. In highway, for the vehicle of avoiding through vehicles to be subject to proceeding to from ring road disturbs, conventionally adopt circuit to be connected other highways. Therefore just need between highway and other roads, a Curved Beam Bridge be set.

Traditional curved ramp bridge superstructure generally adopts Concrete Continuous Box Beam, and bridge presents obvious curved bridge feature, and the Torsion Coupling effect under load action is obvious, and the bending of beam body can increase torsional effect, reverses and can increase again curvature effect. These concrete box girders often there will be span centre transverse crack, web vertical crack, web diagonal crack, bearing to come to nothing and the disease such as deck paving Large Area Cracking; the bridge that disease occurs is too numerous to enumerate, as Beijing-Shanghai high speed C ramp bridge, stone peace Highway Handan North intercommunication K0+469.302 ramp bridge. Due to concrete maintenance difficult, the generation of these diseases has reduced durability and the security of bridge structure.

In addition, a lot of curved ramp bridge substructures adopt only stub, and owing to being subject to the impact of girder curve characteristic, beam body, under the serious uneven loading action of carload, will produce toppling of beam body. On February 21st, 2011, spring line 7K+966 light of spring intercommunication Shaoxing, Zhejiang Province's Shangyu city county road south to Ningbo, Taizhou direction, 4 heavy-duty freight cars reach ring road and cause that ring road topples; On August 24th, 2012, a up ramp bridge of Yang Ming beach, Harbin, Heilongjiang Province Bridge, under 4 traction engine effects, causes ring road to topple. Visible, overturning is the potential safety hazard of only stub bridge.

In sum, the only stub ramp bridge of existing curve disease is numerous, and reason complexity easily produces and topples, and has the problem of durability and security aspect.

Summary of the invention

The object of the invention is to design a kind of expressway ramp bridge form, improve the problem that the only stub ramp bridge of existing curve exists, for achieving the above object, adopt following structural design:

A kind of ramp bridge structure, comprise shaped form steel case beam, Sarasota, suspension cable, bridge pier, Integral Abutment, disc type anchor, pin, ears plate, screw shell, monaural plate, wherein, the outside of described shaped form steel case beam is supported by described bridge pier, and inner side is connected with Sarasota by some skew cables; Sarasota top is fixedly connected with described disc type anchor, on disc type anchor, be fixedly connected with some for connecting the monaural plate of suspension cable, the inner side of described shaped form steel case beam is fixed with some for connecting the monaural plate of suspension cable equally, the two ends of the described suspension cable screw shell that has been threaded respectively, the other end of the described screw shell described ears plate that has been threaded, described ears plate is connected with monaural plate on described disc type anchor and the monaural plate of shaped form steel case beam inner side by pin respectively again; One end of shaped form steel case beam is connected with Integral Abutment, and the other end is connected with existing line.

The cross section of described shaped form steel case beam is asymmetric form, and, near pier location beam section height maximum, reduce gradually near inner side suspension cable active position beam section height in case beam outside.

Described bridge pier adopts only stub, and arranged off-centre is in the outside of shaped form steel case beam.

Described suspension cable bitter end anchor point sustained height, adopts close cable system, space radiation formula rope face.

Described Sarasota adopts the version without dorsal funciculus leaning tower.

Described shaped form steel case beam adopts Integral Abutment with being connected of existing line.

A construction method for described ramp bridge structure, comprises following step:

The first step, the basis of building bridge pier and Sarasota, cushion cap and pier shaft, tower body, and prefabricated disc type anchor and be arranged on tower top, simultaneously prefabricated shaped form steel case beam in factory;

Second step, set up full framing, assembled in situ shaped form steel case beam, and weld monaural plate in relevant position;

The wet section of connecing of the 3rd step, cast Integral Abutment and highway, cast shaped form steel case beam and the wet section of connecing of highway;

The 4th step, be connected with ears plate with screw shell at suspension cable two ends, the ears plate of suspension cable one end is connected with the monaural plate on disc type anchor, the ears plate of the suspension cable other end is connected with monaural plate on shaped form steel case beam, stretching oblique drag-line;

The 5th step, dismounting full framing, complete system conversion;

The 6th step, the bridge deck pavement that paves, install other affiliated facilities of bridge floor.

Ramp bridge form of the present invention has the following advantages:

One, camber beam adopts shaped form steel box girder, has good torsional property, and alleviates dead load, effectively reduces the torsional effect of structure under dead load; Shaped form steel case beam adopts prefabrication, and site-assembled form of construction work, saves the duration greatly.

Two, beam body section adopts asymmetric version, the external side of beam is supported by only stub, inner side is supported by the suspension cable of close cable system, superstructure load is by bridge pier and drag-line shared, in not increasing bridge pier quantity, avoid the overturning of only stub bridge superstructure, improved the security of structure. .

Three, utilize the horizontal component that carrys out balance suspension cable without dorsal funciculus leaning tower, reduce moment of flexure in Sarasota, tower mainly bears the effect of axle power.

Four, Integral Abutment provides reliable antitorque support for camber beam, has cancelled the retractor device of beam-ends, has improved durability and the driving comfort level of ramp bridge.

Five, adopt disk radiant type anchor, make Spatial Cable face suspension cable there is the larger elevation angle, ensured that suspension cable can provide enough large rope force components upwards, supports the case beam of ring road.

Brief description of the drawings

Fig. 1 is the plane without the only tower oblique pull of dorsal funciculus curved ramp bridge;

Fig. 2 is the A-A cutaway view of Fig. 1;

Fig. 3 is Sarasota top detail drawing;

Fig. 4 is detail drawing inside shaped form steel case beam;

Fig. 5 is the top view of disc type anchor;

Fig. 6 is the elevation of an otic placode on disc type anchor;

Fig. 7 is the front view of ears plate;

Fig. 8 is the top view of ears plate;

Fig. 9 is the side view of ears plate;

Figure 10 is the profile of screw shell;

Figure 11 is the left view of screw shell

Wherein: 1, shaped form steel case beam; 2, Sarasota; 3, suspension cable; 4, only stub; 5, Integral Abutment; 6, highway; 7, ring road; 8, disc type anchor; 9, pin; 10, ears plate; 11, screw shell; 12, monaural plate.

Detailed description of the invention

In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of instructions such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of device or the element of instruction or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention. in addition, term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importance or the implicit quantity that indicates indicated technical characterictic. thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ". in description of the invention, except as otherwise noted, the implication of " multiple " is two or more.

In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals. For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.

Referring to Fig. 1 ~ Figure 11, a kind of ramp bridge structure of the present invention, it is mainly made up of shaped form steel case beam 1, Sarasota 2, suspension cable 3, bridge pier 4, Integral Abutment 5, disc type anchor 8, pin 9, ears plate 10, screw shell 11, monaural plate 12.

Concrete connected mode is: Sarasota 2 tops install disc type anchor 8; Shaped form steel case beam 1 inner side and monaural plate 12 weld, and shaped form steel case beam 1 outside is supported by bridge pier 4; The two ends of suspension cable 3 are connected with ears plate by screw shell 11, and wherein the ears plate of one end is connected with pin with the monaural plate on disc type anchor 8, and other end ears plate is connected with pin with shaped form steel case beam 1 inner side monaural plate; One end of shaped form steel case beam 1 is connected with Integral Abutment 5, and the other end is connected with highway 6.

Sarasota 2 adopts the version without dorsal funciculus, and upper end is subject to the horizontal force of suspension cable, and this power is passed to the basis of leaning tower.

The Specific construction step of a kind of ramp bridge structure of the present invention:

The first step, build basis, cushion cap and pier shaft, the tower body of bridge pier 4 and Sarasota 2, and prefabricated disc type anchor and be arranged on tower top, prefabricated shaped form steel case beam 1 in factory simultaneously;

Second step, set up full framing, assembled in situ shaped form steel case beam 1, and weld monaural plate in relevant position;

The wet section of connecing of the 3rd step, cast Integral Abutment 5 and shaped form steel case 1 beam and highway;

The 4th step, be connected with ears plate with screw shells 11 at suspension cable 3 two ends, the ears plate of suspension cable 3 one end is connected with the monaural plate on disc type anchor 8, the ears plate of suspension cable 3 other ends is connected with monaural plate on shaped form steel case beam 1, stretching oblique drag-line 3;

The 5th step, dismounting full framing, complete system conversion;

The 6th step, the bridge deck pavement that paves, install other affiliated facilities of bridge floor.

Above-mentioned expressway ramp bridge is applicable to the design of most expressway ramp bridges, and structure stress is reliable, and beautiful design has certain originality and advantage.

Claims (7)

1. a ramp bridge structure, it is characterized in that, comprise shaped form steel case beam (1), Sarasota (2), suspension cable (3), bridge pier (4), Integral Abutment (5), disc type anchor (8), pin (9), ears plate (10), screw shell (11), monaural plate (12), wherein, the outside of described shaped form steel case beam (1) is supported by described bridge pier (4), and inner side is connected with Sarasota (2) by some skew cables (3), Sarasota (2) top is fixedly connected with described disc type anchor (8), on disc type anchor (8), be fixedly connected with some for connecting the monaural plate of suspension cable (3), the inner side of described shaped form steel case beam (1) is fixed with some for connecting the monaural plate of suspension cable (3) equally, the two ends of described suspension cable (3) screw shell (11) that has been threaded respectively, the other end of described screw shell (11) the described ears plate that has been threaded, described ears plate is connected with the monaural plate of monaural plate on described disc type anchor (8) and shaped form steel case beam (1) inner side by pin respectively again, one end of shaped form steel case beam (1) is connected with Integral Abutment (5), and the other end is connected with existing line (6).

2. a kind of ramp bridge structure according to claim 1, it is characterized in that, the cross section of described shaped form steel case beam (1) is asymmetric form, and, near only post pier location beam section height maximum, reduce gradually near inner side suspension cable active position beam section height in case beam outside.

3. a kind of ramp bridge structure according to claim 1 and 2, is characterized in that, described bridge pier adopts only stub, and arranged off-centre is in the outside of shaped form steel case beam.

4. a kind of ramp bridge structure according to claim 3, is characterized in that, described suspension cable (3) bitter end anchor point sustained height, adopts close cable system, space radiation formula rope face.

5. a kind of ramp bridge structure according to claim 4, is characterized in that, described Sarasota (2) adopts the version without dorsal funciculus leaning tower.

6. a kind of ramp bridge structure according to claim 5, is characterized in that, described shaped form steel case beam (1) adopts Integral Abutment with being connected of existing line (6).

7. the construction method based on ramp bridge structure described in claim 1 or 2 or 4 or 5 or 6, comprises following step:

The first step, build basis, cushion cap and pier shaft, the tower body of bridge pier (4) and Sarasota (2), and prefabricated disc type anchor and be arranged on tower top, prefabricated shaped form steel case beam (1) in factory simultaneously;

Second step, set up full framing, assembled in situ shaped form steel case beam (1), and weld monaural plate in relevant position;

The 3rd step, cast Integral Abutment (5) and the wet section of connecing of highway, cast shaped form steel case beam (1) and the wet section of connecing of highway;

The 4th step, be connected with ears plate at suspension cable (3) screw shell for two ends (11), the ears plate of suspension cable (3) one end is connected with the monaural plate on disc type anchor (8), the ears plate of suspension cable (3) other end is connected with the upper monaural plate of shaped form steel case beam (1), stretching oblique drag-line (3);

The 5th step, dismounting full framing, complete system conversion;

The 6th step, the bridge deck pavement that paves, install other affiliated facilities of bridge floor.