CN102277826A - Partial earth anchor intersecting cable-stayed bridge - Google Patents

Abstract

The invention discloses a partially ground-anchored cross-cable cable-stayed bridge, which comprises adjacent first bridge towers (1) and second bridge towers (10), a main girder (7) in a common section, a mid-span mid-span section The main girder (6), the main girder (6) of the mid-span mid-span section is connected with the first bridge tower (1) and the second bridge respectively through the crossing outer cable (2) and the crossing inner cable (3) The towers (10) are connected, the crossing outer cables (2) and the crossing inner cables (3) intersect in the projection of the vertical bridge to the facade, and do not intersect in the projection of the horizontal bridge to the facade, and the first bridge tower (1 ) and the second bridge tower (10) are respectively connected to each other by the end anchor cable (5) and the anchor spindle (8), and the described common section girder (7) is connected to the first bridge tower by the common cable (4) (1) or the second bridge tower (10) are symmetrically connected. The invention has the advantages of high rigidity of the main girder in the mid-span section, small horizontal force of the main girder in the ordinary section, and large spanning capacity.

Description

A partially ground anchored cross-cable cable-stayed bridge

technical field

The invention relates to a bridge, in particular to a partially ground-anchored cross-cable cable-stayed bridge.

Background technique

Cable-stayed bridges have been built in large numbers due to the advantages of being able to achieve large spans with relatively small girder heights. With the increase of the span, the compressive stress of the cross-section of the main girder near the bridge tower increases rapidly, which is the main factor restricting the spanning capacity of the cable-stayed bridge. At present, the arrangement form of cables of cable-stayed bridges at home and abroad is a single type of cable plane. For radial and harp-shaped cable surfaces, the anchorage points of the cables on the pylons are scattered, and higher pylons are required to arrange the anchorage points of the cables; The number of cables is small, so it is not suitable for long-span cable-stayed bridges. On the other hand, the existing cable-stayed cables and pylon layout have weak constraints on the mid-span girder, and the mid-span girder section has low stiffness, which is not suitable for lines with strict rigidity requirements. Otherwise, it is necessary to increase the cable surface and improve the The height of the main girder is used to solve the problem of the stiffness of the main girder in the span, and these methods will lead to a large increase in the amount of engineering and make the cable-stayed bridge lose its competitive advantage.

Contents of the invention

The technical problem to be solved by the present invention is to provide a partially ground-anchored cross-cable cable-stayed bridge with small main girder compressive stress, high mid-span rigidity and good economy.

In order to solve the above-mentioned technical problems, the partially ground-anchored cross-cable cable-stayed bridge provided by the present invention includes adjacent first bridge towers and second bridge towers, a common section main girder, a mid-span mid-span section main girder, and The main girder of the mid-span section of the mid-span is connected to the first bridge tower and the second bridge tower respectively through crossing outer cables and crossing inner cables, and the crossing outer cables and crossing inner cables are projected on the vertical bridge to the facade Intersecting, the projection of the transverse bridge to the elevation does not intersect, the first bridge tower and the second bridge tower are connected to the anchor spindle through the end anchor cable respectively, and the main beam of the common section is connected to the first bridge bridge through the common cable A bridge tower or a second bridge tower is connected symmetrically.

The crossing outer cables and crossing inner cables are respectively anchored to the tops of the first bridge tower and the second bridge tower with radial cable surfaces, and the tower tops of the first bridge tower and the second bridge tower are respectively The end anchor cable is connected to the anchor spindle, and the common cable adopts a fan-shaped cable surface or a harp-shaped cable surface and is symmetrically anchored to the body of the first bridge tower or the second bridge tower.

The length of the beam segment arranged with the said crossing outer cables and crossing inner cables accounts for 1/4-1/3 of the length of the main span. In order to make the cross-outside cables and cross-inside cables not intersect on the cross section, a pair of stay cables is arranged on the main girder of the mid-span section of the widened mid-span to the required width. The anchor spindle also serves as a side-span pier.

Compared with the prior art, the partial ground-anchor cross-cable cable-stayed bridge adopting the above-mentioned technical scheme has the advantages of: first, it can increase the spanning capacity of the cable-stayed bridge by 1/4 to 1/3, making the cable-stayed bridge more It is suitable for application on super long-span bridges over 1000 meters. In the prior art, the larger the span of the cable-stayed bridge, the greater the compressive stress of the girder section at the pylon, and the spanning capacity of the cable-stayed bridge is limited by the compressive strength of the main girder material. The partially ground-anchored cable-stayed bridge scheme proposed by Professor Jimson of the Technical University of Denmark can solve the problem of excessive compressive stress of the main girder, but the construction process is very complicated. In the partly anchored cross-cable cable-stayed bridge provided by the present invention, the horizontal force of the mid-span girder section is self-balanced, and the compressive stress of the common girder section is not increased, so that it is not limited by the compressive strength of the main girder material; secondly, the mid-span The stiffness of the beam segment. Compared with the existing technology, the cable-stayed bridge with intersecting cables doubles the number of cables in the mid-span beam section, and the stiffness of the beam section is significantly improved. way to apply.

Description of drawings

Fig. 1 is the front view of the present invention;

Fig. 2 is the top view of the present invention;

Fig. 3 is a partial enlarged view of place a in Fig. 2;

Fig. 4 is the sectional view of A-A place in Fig. 1;

Fig. 5 is the sectional view of B-B place in Fig. 1;

illustration:

1. The first bridge tower 2. Cross outer cables

3. Cross inner cable 4. Ordinary cable

5. End anchor cable 6. Main beam in mid-span section

7. Main beam of ordinary section 8. Anchor ingot

9. Auxiliary pier 10. The second bridge tower

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the main girder 6 of the mid-span section of the mid-span is respectively anchored to the first bridge tower 1 and the second On the tower top of the bridge tower 10, the crossing outer cables 2 and the crossing inner cables 3 intersect in the projection of the longitudinal bridge to the elevation, and do not intersect in the projection of the transverse bridge to the elevation. The harp-shaped cable plane is symmetrically anchored to the tower body of the first bridge tower 1 or the second bridge tower 10, and the tower tops of the first bridge tower 1 and the second bridge tower 10 are connected to the anchor spindle 8 through the end anchor cable 5 respectively. The section main beam 7 is provided with auxiliary piers 9 . The length of the beam segment arranged with crossing outer cables 2 and crossing inner cables 3 accounts for 1/4 to 1/3 of the length of the main span; The width required for the arrangement of a pair of stay cables on the main girder 6 of the mid-span section is shown in FIG. 3 . The anchor spindle 8 doubles as a side-span bridge pier simultaneously.

The construction steps of the part ground anchor cross-cable cable-stayed bridge in this specific embodiment are:

Step 1: first carry out the construction of the pile foundation and the first bridge tower 1, the second bridge tower 10, the auxiliary pier 9, and the anchor spindle 8;

Step 2: Symmetrically construct the main beam 7 of the ordinary section, and erect the ordinary cable 4;

Step 3: erecting the end anchor cable 5;

Step 4: Erect the main beam 6 of the mid-span section symmetrically, erect the cross outer cable 2 and the cross inner cable 3, and adjust the cable force of the end anchor cable 5 successively;

Step 5: Complete the ancillary works and bridge deck pavement, and reach the completed bridge state.

The construction of the above-mentioned cross-cable cable-stayed bridge has more steps of anchor construction than the conventional cable-stayed bridge construction method, which has formed a mature technology in the construction of the suspension bridge and does not increase the difficulty of construction.

Claims (3)

1. A partially ground-anchored cross-cable cable-stayed bridge, comprising adjacent first bridge towers (1) and second bridge towers (10), common section main girders (7), mid-span mid-span section main girders (6), it is characterized in that: the main girder (6) of the mid-span section of the mid-span is respectively connected to the first bridge tower (1) and the first bridge tower (1) and the first bridge tower (1) through the cross-outboard cable (2) and the cross-inside cable (3). The two bridge towers (10) are connected, and the crossing outer cables (2) and the crossing inner cables (3) intersect in the projection of the vertical bridge to the facade, and do not intersect in the projection of the horizontal bridge to the facade, and the first bridge tower (1) and the second bridge tower (10) are respectively connected to each other by end anchor cables (5) and anchor spindles (8), and the described common section girder (7) is connected to the described first bridge by common cables (4). The bridge towers (1) or the second bridge towers (10) are connected symmetrically. 2. The partially ground-anchored cross-cable cable-stayed bridge according to claim 1, characterized in that: said crossing outer cables (2) and crossing inner cables (3) are respectively anchored on said first crossing using a radial cable surface. The tower tops of a bridge tower (1) and the second bridge tower (10), the tower tops of the first bridge tower (1) and the second bridge tower (10) pass through the end anchor cables (5) respectively Connected with the anchor spindle (8), the ordinary cable (4) is symmetrically anchored to the first bridge tower (1) or the second bridge tower (10) using a fan-shaped cable surface or a harp-shaped cable surface the body of the tower. 3. according to claim 1 and 2 described partial ground anchor crossing cable-stayed bridges, it is characterized in that: the beam section length that is arranged with described crossing outer cable (2) and crossing inner cable (3) accounts for main span length 1/4～1/3 of that.

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