A cable-stayed anchorage structure for eliminating mid-span tension of concrete girder cable-stayed bridges

Abstract

The invention belongs to the bridge construction technical field, and specifically relates to a stay cable anchoring structure eliminating a midspan pulling force of a concrete girder; the stay cable anchoring structure comprises a midspan girder and midspan a first pair of stay ropes supporting the midspan girder; the stay cable anchoring structure also comprises a steel anchor beam vertically connected with the midspan girder in a slide manner; the steel anchor beam is fixedly connected with the midspan girder in an up-down direction vertical to the bridge direction, thus providing upward support force for the midspan girder; the first pair of midspan stay ropes are stressed and tensioned, and the bottoms of the stay ropes are fixed on the steel anchor beam. The stay cable anchoring structure is simple in structure, convenient in mounting, can reconstruct an existing cable-stayed bridge, thus greatly improving bearing structure of the midspan girder, prolonging service life of the bridge floor, reducing maintenance period of the bridge floor cracks, and providing massive promotion value.

Description

technical field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a stay cable anchorage structure for eliminating mid-span tension of a concrete girder cable-stayed bridge. Background technique

[0002] At present, there are three main structural models of long-span flexible system bridges, including cable-stayed bridges, suspension bridges, and cable-stayed-suspension collaborative bridges. Among them, the cable-stayed bridge is a structural system composed of towers under pressure, cables under tension and beams under bending, and can be regarded as a multi-span elastically supported continuous beam with cables instead of piers. The cable-stayed bridge has the advantages of reducing the bending moment in the girder body, reducing the building height, reducing the structural weight, saving materials, etc., and is widely used because of its stable structure and low cost.

[0003] However, the cable-stayed bridge has st...

Examples

Embodiment 1

[0024] Embodiment 1: as Figure 2~3 As shown, it includes the mid-span main girder 1 and the first pair of stay cables 2 in the mid-span used to support the mid-span main girder 1. For a bridge with stay cables on both sides, the first pair of stay cables in the mid-span 2 includes two sets of four stay cables in total. For a stay cable bridge in which the stay cables are arranged in the middle of the bridge, the first pair of stay cables 2 in the mid-span includes two stay cables.

[0025] In the prior art, one end of the first pair of stay cables 2 is anchored on the top of the tower, and the other end is directly anchored on the mid-span main girder 1, and the mid-span main girder 1 is fixed by the support of the stay cables. In this embodiment, a steel anchor beam 3 that can slide longitudinally along the bridge is provided on the outside of the mid-span main girder 1, and the steel anchor beam 3 is limitedly connected with the mid-span main girder 1 in the vertical direct...

Embodiment 2

[0031] Embodiment 2: as Figure 5 As shown, the bridge structure of this embodiment is the same as that of Embodiment 1. The steel anchor beam 3 of this embodiment is a ring structure sleeved on the outside of the mid-span main beam 1. The steel anchor beam 3 can slide longitudinally along the bridge, and the steel anchor beam The inner side of 3 is in contact with the lower end of the mid-span main beam 1 to provide upward supporting force thereto.

[0032] In fact, the structural protection performance of this arrangement of the steel anchor beam 3 is better and more stable, and the steel anchor beam 3 will not be detached from the main beam no matter which direction the pulling force is received from. But because the contact area between the steel anchor beam 3 and the mid-span main beam 1 of the present embodiment is the largest, and the frictional force is also the largest, therefore, it is also possible to add some steel anchor beams 3 between the steel anchor beam 3 and...

Embodiment 3

[0033] Embodiment 3: as Figure 6 As shown, the bridge structure of this embodiment is the same. The steel anchor beam 3 of this embodiment is a U-shaped structure in which the lower end of the steel anchor beam 3 is fitted to the lower end of the mid-span main beam 1 and its two sides are fitted to both sides of the mid-span main beam 1, and the upper end is not sealed. To avoid affecting the passage of cars on the bridge deck, the lower end of the steel anchor beam 3 forms a lifting structure, which can slide longitudinally along the bridge, and the lower end provides upward support to the mid-span main girder.

[0034] Compared with Embodiment 2, this embodiment is more material-saving, but the frictional resistance generated during the sliding process of the steel anchor beam 3 basically does not become smaller. device.

technical field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a stay cable anchorage structure for eliminating mid-span tension of a concrete girder cable-stayed bridge. Background technique

[0002] At present, there are three main structural models of long-span flexible system bridges, including cable-stayed bridges, suspension bridges, and cable-stayed-suspension collaborative bridges. Among them, the cable-stayed bridge is a structural system composed of towers under pressure, cables under tension and beams under bending, and can be regarded as a multi-span elastically supported continuous beam with cables instead of piers. The cable-stayed bridge has the advantages of reducing the bending moment in the girder body, reducing the building height, reducing the structural weight, saving materials, etc., and is widely used because of its stable structure and low cost.

[0003] However, the cable-stayed bridge has st...

Examples

Embodiment 1

[0024] Embodiment 1: as Figure 2~3 As shown, it includes the mid-span main girder 1 and the first pair of stay cables 2 in the mid-span used to support the mid-span main girder 1. For a bridge with stay cables on both sides, the first pair of stay cables in the mid-span 2 includes two sets of four stay cables in total. For a stay cable bridge in which the stay cables are arranged in the middle of the bridge, the first pair of stay cables 2 in the mid-span includes two stay cables.

[0025] In the prior art, one end of the first pair of stay cables 2 is anchored on the top of the tower, and the other end is directly anchored on the mid-span main girder 1, and the mid-span main girder 1 is fixed by the support of the stay cables. In this embodiment, a steel anchor beam 3 that can slide longitudinally along the bridge is provided on the outside of the mid-span main girder 1, and the steel anchor beam 3 is limitedly connected with the mid-span main girder 1 in the vertical direct...

Embodiment 2

[0031] Embodiment 2: as Figure 5 As shown, the bridge structure of this embodiment is the same as that of Embodiment 1. The steel anchor beam 3 of this embodiment is a ring structure sleeved on the outside of the mid-span main beam 1. The steel anchor beam 3 can slide longitudinally along the bridge, and the steel anchor beam The inner side of 3 is in contact with the lower end of the mid-span main beam 1 to provide upward supporting force thereto.

[0032] In fact, the structural protection performance of this arrangement of the steel anchor beam 3 is better and more stable, and the steel anchor beam 3 will not be detached from the main beam no matter which direction the pulling force is received from. But because the contact area between the steel anchor beam 3 and the mid-span main beam 1 of the present embodiment is the largest, and the frictional force is also the largest, therefore, it is also possible to add some steel anchor beams 3 between the steel anchor beam 3 and...

Embodiment 3

[0033] Embodiment 3: as Figure 6 As shown, the bridge structure of this embodiment is the same. The steel anchor beam 3 of this embodiment is a U-shaped structure in which the lower end of the steel anchor beam 3 is fitted to the lower end of the mid-span main beam 1 and its two sides are fitted to both sides of the mid-span main beam 1, and the upper end is not sealed. To avoid affecting the passage of cars on the bridge deck, the lower end of the steel anchor beam 3 forms a lifting structure, which can slide longitudinally along the bridge, and the lower end provides upward support to the mid-span main girder.

[0034] Compared with Embodiment 2, this embodiment is more material-saving, but the frictional resistance generated during the sliding process of the steel anchor beam 3 basically does not become smaller. device.

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