Multi-tower partial cable-stayed bridge with unequal-height towers

Abstract

The multi-tower partial cable-stayed bridge comprises two side main towers and an auxiliary middle tower, the two side main towers are arranged on the two sides of the auxiliary middle tower respectively, side main piers are arranged at the bottoms of the side main towers, auxiliary middle piers are arranged at the bottoms of the auxiliary middle tower, and the side main piers are connected with the auxiliary middle piers through the auxiliary middle piers. The side main tower is connected with the auxiliary middle tower through a main beam, and the side main tower and the auxiliary middle tower are respectively connected with the main beam through stay cables; and the height of the auxiliary middle tower is lower than that of the side main tower. The multi-tower partial cable-stayed bridge has the advantages that the multi-tower partial cable-stayed bridge with the unequal-height towers is formed in the mode that the small-height auxiliary middle towers and the large-height side main towers are combined, the small-foundation-size auxiliary middle piers are built in a deep water area, and the large-foundation-size side main piers are built on the shoreside or a shallow water area; the crossing capacity of the partial cable-stayed bridge is improved while the bridge construction difficulty is reduced, and the overall rigidity of the multi-tower partial cable-stayed bridge is improved by arranging the transverse anchor cables and the inclined anchor cables.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge structures, in particular to a multi-tower partial cable-stayed bridge with towers of unequal heights. Background Art

[0002] The low-tower cable-stayed bridge, also known as the partial cable-stayed bridge, is a bridge type between the rigid beam bridge and the flexible cable-stayed bridge. It has the characteristics of both beam bridges and cable-stayed bridges, with large span capacity, large main beam rigidity, low construction difficulty, and good economy. The low-tower cable-stayed bridge has high rigidity of the tower and main beam, which is more conducive to controlling the horizontal displacement of the tower top and the deformation of the main beam, creating favorable conditions for the design of multi-tower partial cable-stayed bridges.

[0003] Compared with double-tower partial cable-stayed bridges, multi-tower partial cable-stayed bridges have the problem of weakened main beam stiffness. Studies have shown that due to the lack of effective constraints such as end anchor cables and auxiliary piers, the middle tower of a multi-tower partial cable-stayed bridge has insufficient longitudinal stiffness, resulting in large vertical deflection of the main beam.

[0004] Multi-tower partial cable-stayed bridges are often used to cross large rivers, lakes, and deep reservoirs. The foundation size of large-span bridges is generally large, especially the middle pier located in deep water areas, which is difficult to construct. Summary of the invention

[0005] The purpose of the utility model is to provide a multi-tower partial cable-stayed bridge with unequal-height towers in accordance with the above-mentioned deficiencies in the prior art, wherein the side towers are high and have large foundation dimensions and are built on the shore or in shallow waters, while the middle towers are low and have small foundation dimensions and are built in deep waters, thereby reducing the difficulty of building the middle piers in deep waters, proposing a bridge tower stress form using transverse anchor cables and oblique anchor cables as anchors, and improving the stiffness and strength of the multi-tower partial cable-stayed bridge.

[0006] The purpose of this utility model is achieved by the following technical solutions:

[0007] A multi-tower partial cable-stayed bridge with towers of unequal heights, characterized in that it comprises two side main towers and one auxiliary middle tower, wherein the two side main towers are respectively arranged at two sides of the auxiliary middle tower, the bottom of the side main towers is provided with side main piers, the bottom of the auxiliary middle tower is provided with auxiliary middle piers, the side main towers and the auxiliary middle towers are connected by main beams, and the side main towers and the auxiliary middle towers are respectively connected to the main beams by inclined cables; the height of the auxiliary middle tower is lower than that of the side main towers.

[0008] The main beam is composed of a main beam mid-span cable-free area, a main beam mid-span cable-supported area, a side main tower cable-free area, an auxiliary mid-tower cable-supported area, an auxiliary mid-tower cable-free area, and a main beam side-span cable-supported area.

[0009] Among them, the cable area in the middle span of the main beam and the cable area in the side span of the main beam are fixed with one end of the inclined cable, and the other end of the inclined cable is slidably connected to the side main tower; the cable area in the auxiliary middle tower is fixed with one end of the inclined cable, and the other end of the inclined cable is slidably connected to the auxiliary middle tower.

[0010] The auxiliary middle tower is fixed to the main beam through oblique anchor cables.

[0011] The auxiliary middle tower is connected to the side main tower through a transverse anchor cable.

[0012] The main beam side span of the main beam is provided with a cable area and a main beam counterweight.

[0013] The stay cables located at the side main towers may be symmetrical or asymmetrical.

[0014] The advantages of the utility model are:

[0015] 1) Crossing large rivers, lakes and deep reservoirs, it has the characteristics of high side towers, large foundation size, built on the shore or shallow water area, low middle tower, small foundation size, built in deep water area, reducing the difficulty of bridge construction in deep water area and strong applicability;

[0016] 2) The auxiliary middle tower is consolidated with the side main tower by using transverse anchor cables and oblique anchor cables, forming a bridge tower force form anchored by transverse anchor cables and oblique anchor cables, thereby improving the overall stiffness of the multi-tower cable-stayed bridge and solving the problem of weakened main beam stiffness of the multi-tower cable-stayed bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the utility model;

[0019] Figure 3 This is a diagram of the rigid frame system of the middle side main pier of the utility model;

[0020] Figure 4 This is a diagram of the auxiliary middle pier support system in the utility model;

[0021] Figure 5 This is a diagram of the support system of the middle and side main piers of the utility model;

[0022] Figure 6 This is a diagram of the auxiliary middle pier rigid frame system in the utility model. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:

[0024] like Figure 1-6As shown, the symbols in the figure respectively represent: side main tower 1, auxiliary middle tower 2, inclined cable 3, transverse anchor cable 4, inclined anchor cable 5, main beam 6, main beam weight 7, side main pier 8, auxiliary middle pier 9, side pier 10;

[0025] There is a cable-free area 61 in the middle span of the main beam, a cable-supported area 62 in the middle span of the main beam, a cable-free area 63 in the side main tower, a cable-supported area 64 in the auxiliary middle tower, a cable-free area 65 in the auxiliary middle tower, and a cable-supported area 66 in the side span of the main beam.

[0026] Example: Figures 1 to 6 As shown, the multi-tower partial cable-stayed bridge with unequal height towers in this embodiment includes: a side main tower 1, an auxiliary middle tower 2, a cable-stayed cable 3, a transverse anchor cable 4, an inclined anchor cable 5, a main beam 6, a main beam weight 7, a side main pier 8, an auxiliary middle pier 9, and a side pier 10.

[0027] like Figure 1 As shown, the two side main towers 1 are respectively located on both sides of the auxiliary middle tower 2, and the heights of the two side main towers 1 are higher than the height of the auxiliary middle tower 2; the side main towers 1 are supported by setting the side main piers 8 below, and the auxiliary middle tower 2 is supported by setting the auxiliary middle piers 10 below. At this time, this embodiment forms a multi-tower partial cable-stayed bridge with unequal tower heights. Among them, the auxiliary middle tower 2 with a relatively small foundation size is built in a deep water area, and the side main piers 8 with a relatively large foundation size are built on the shore or in a shallow water area, which significantly reduces the difficulty of bridge construction while improving the spanning capacity of the partial cable-stayed bridge, and is particularly suitable for large-span spans across large rivers, lakes, and lakes.

[0028] Specifically, the side main towers 1 and the auxiliary middle towers 2 are connected by main beams 6. Figure 2 As shown, the main beam 6 is composed of a main beam mid-span cable-free area 61, a main beam mid-span cable-supported area 62, a side main tower cable-free area 63, an auxiliary middle tower cable-supported area 64, an auxiliary middle tower cable-free area 65, and a main beam side span cable-supported area 66.

[0029] The cable area 62 of the middle span and the cable area 66 of the side span of the main beam are respectively fixed to the inclined cables 3, and the inclined cables 3 are slidably connected to the side main tower 1. The cable area 64 of the auxiliary middle tower is fixed to the inclined cables 3, and the inclined cables 3 are slidably connected to the auxiliary middle tower 2.

[0030] like Figure 3 and Figure 4 As shown, the side main tower 1 is fixed to the main beam 6, and the side main pier 8 is fixed to the main beam 6. When the height of the side main pier 8 is greater than 1 / 10 of the main span of the main beam 6, the side main pier 8 is fixed to the main beam 6, forming a rigid frame system. The auxiliary middle tower 2 is separated from the auxiliary middle pier 9, forming a support system. The side main pier 8 is a double thin-wall structure.

[0031] like Figure 5 and Figure 6As shown, the side main tower 1 is fixed to the main beam 6, and the side main pier 8 is fixed to the main beam 6. When the height of the side main pier 8 is less than 1 / 10 of the main span of the main beam 6, the side main pier 8 is separated from the main beam 6 to form a support system. The auxiliary middle tower 2 is fixed to the auxiliary middle pier 9 to form a rigid frame system.

[0032] like Figure 1-6 As shown, the auxiliary middle tower 2 is fixed to the side main tower 1 by means of transverse anchor cables 4, and fixed to the main beam 6 by means of inclined anchor cables 5.

[0033] As an embodiment, by using finite element calculation, when the vertical stiffness of a multi-tower partial cable-stayed bridge with unequal towers is about to reach a maximum value, the lengths and proportions of the main beam mid-span cable zone 62, the main beam mid-span cable-free zone 61, and the auxiliary middle tower cable zone 64 are optimal, and the length ratio of the main beam mid-span cable zone 62 to the auxiliary middle tower cable zone 64 is greater than 1.5; through the finite element calculation results of the overall stiffness of a multi-tower partial cable-stayed bridge with unequal towers, when the overall stiffness meets the calculation requirements, the consolidation of the transverse anchor cable 4 and the side main tower 1 is cancelled.

[0034] In order to further ensure that the auxiliary middle pier 9 is subjected to less force, the foundation size is small, and the difficulty of foundation construction in deep water areas is reduced, the inclined cables 3 of the side main tower 1 can be adjusted to be asymmetric. As a preference, the main beam side span of the main beam 6 is provided with a cable area 66 equipped with a main beam weight 7 to balance the force of the inclined cables 3 and also to ensure that the supports of the side piers 10 are not empty.

[0035] Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A multi-tower partial cable-stayed bridge with towers of unequal heights, characterized in that: It includes two side main towers and one auxiliary middle tower, wherein the two side main towers are respectively arranged at both sides of the auxiliary middle tower, the bottom of the side main tower is provided with side main piers, the bottom of the auxiliary middle tower is provided with auxiliary middle piers, the side main towers and the auxiliary middle tower are connected by main beams, and the side main towers and the auxiliary middle tower are respectively connected to the main beams by inclined cables; the height of the auxiliary middle tower is lower than that of the side main towers.

2. The multi-tower partial cable-stayed bridge with unequal tower heights according to claim 1, characterized in that: The main beam is composed of a main beam mid-span cable-free area, a main beam mid-span cable-supported area, a side main tower cable-free area, an auxiliary mid-tower cable-supported area, an auxiliary mid-tower cable-free area, and a main beam side-span cable-supported area. Among them, the cable area in the middle span of the main beam and the cable area in the side span of the main beam are fixed with one end of the inclined cable, and the other end of the inclined cable is slidably connected to the side main tower; the cable area in the auxiliary middle tower is fixed with one end of the inclined cable, and the other end of the inclined cable is slidably connected to the auxiliary middle tower.

3. A multi-tower partial cable-stayed bridge with unequal tower heights according to claim 1 or 2, characterized in that: The auxiliary middle tower is fixed to the main beam through oblique anchor cables.

4. A multi-tower partial cable-stayed bridge with unequal tower heights according to claim 1 or 2, characterized in that: The auxiliary middle tower is connected to the side main tower through a transverse anchor cable.

5. The multi-tower partial cable-stayed bridge with unequal tower heights according to claim 2, characterized in that: The main beam side span of the main beam is provided with a cable area and a main beam counterweight.

6. The multi-tower partial cable-stayed bridge with unequal tower heights according to claim 1, characterized in that: The stay cables located at the side main towers may be symmetrical or asymmetrical.

Images