CN202064276U - Cable-girder anchorage structure of railway steel truss cable stayed bridge - Google Patents

Abstract

A cable-girder anchorage structure of a railway steel truss cable stayed bridge has the advantages of being even in stress, short in force transmitting route, safe and simple and comprises a steel anchor box (10) with a pair of anchor pulling plates (11 and 12). The anchor pulling plates (11 and 12) are connected with upper chord gusset plates (20) arranged on two sides of a main truss through a splice plate (30) and high strength bolts. Steel sleeves (N8) for stayed cables to penetrate are fixedly arranged inside the steel anchor box (10), and stayed cable axes of the steel sleeves (N8) are crossed with central lines of pitch points of the main truss and upper chord system lines.

Description

Cable girder anchorage structure of railway steel truss cable-stayed bridge

technical field

The utility model relates to a railway steel truss cable-stayed bridge, in particular to a cable beam anchorage structure of a steel truss cable-stayed bridge.

Background technique

Since the construction of modern cable-stayed bridges began in China in the 1970s, it has developed rapidly in the past 30 years, and hundreds of them have been built so far. However, the development of railway cable-stayed bridges is very slow. In recent years, the pace of railway construction has accelerated, and cable-stayed bridge schemes have been proposed in the bridge scheme research of some new lines, especially the preliminary work of the Beijing-Shanghai high-speed railway, which has enabled the design and research of railway cable-stayed bridges to be carried out in depth. The current research on cable-stayed railway bridges has covered spans ranging from more than 200 meters to more than 600 meters. The development of these research works has provided a good theoretical basis and necessary technical reserves for the construction and development of cable-stayed railway bridges.

So far, there are not many railway cable-stayed bridges built in the world. The Sava River Bridge in Belgrade, Yugoslavia, built in 1980, is a heavy-duty railway cable-stayed bridge with a span of 250m; Japan's Second Chikugawa Bridge is a railway low-tower cable-stayed bridge with a main span of 134m. The maximum span of the highway-rail dual-purpose cable-stayed bridges that have been built in China is 504 meters (Wuhan Tianxingzhou Yangtze River Bridge, double-layer bridge with four-line railway and six-lane road), and the main span of the Tongling Yangtze River Bridge under construction is 630 meters (four-lane bridge). Line railway plus six-lane highway double-deck bridge), the maximum span of the road-rail dual-purpose cable-stayed bridge that has been built abroad is the Danish Øresund Bridge, with a main span of 490 meters.

Cable-girder anchorage of cable-stayed bridges is an important force transmission mechanism of cable-stayed bridges. The details here will directly affect the safety of the entire bridge structure. Cable-girder anchorage will inevitably weaken or affect the cross-section of the main beam. When the anchor nodes are located above the bridge deck, the force transmission is direct, and the manufacture, inspection and installation are more convenient. However, because the upper chord gusset plate protrudes from the bridge deck, the bridge deck is discontinuous; when the anchor nodes are located inside the nodes, due to the narrow space inside the nodes, Poor construction conditions and criss-cross welding make it difficult to manufacture, install, repair, and maintain; when the anchor nodes are located at the lower part of the gusset plate, it is easy to process and maintain, but the requirements for the truss form are high, and N-type trusses are generally used.

Utility model content

The technical problem to be solved by the utility model is to provide a cable girder anchorage structure of a railway steel truss cable-stayed bridge, which has the characteristics of uniform force, short force transmission path, safety and simplicity.

The technical solution adopted by the utility model to solve its technical problems is as follows:

The cable girder anchorage structure of the railway steel truss cable-stayed bridge of the utility model is characterized in that it includes a steel anchor box with a pair of anchor plates, and the pair of anchor plates are connected to the upper chord nodes on both sides of the main truss through splicing plates and high-strength bolts. Plate connection; the steel anchor box is fixed with a steel casing for the stay cable to pass through, and the cable axis of the steel casing intersects with the center line of the main truss node and the upper chord system line.

The beneficial effect of the utility model is that, compared with the existing cable beam anchorage structure, the welding seam is less, the stress is reasonable and clear, and the application range is wide. In addition to the thicker steel plates used as the main force-bearing members for anchor backing plates, vertical plates and anchor pull plates, thinner steel plates can be used for steel casings, partition plates, top cover plates and bottom cover plates to save materials and have It is beneficial to reduce the construction cost.

Description of drawings

This manual includes the following three drawings:

Fig. 1 is the structural representation of the cable girder anchorage structure of the utility model railway steel truss cable-stayed bridge;

Fig. 2 is a sectional view along line A-A in Fig. 1;

Figure 3 is a cross-sectional view along line B-B in Figure 1.

The parts, part names and corresponding marks are shown in the figure: steel anchor box 10, anchor tie plate 11, anchor tie plate 12, upper chord gusset plate 20, top cover plate N4, vertical plate N2, partition plate N3, bottom Cover plate N5, stiffener N6, anchor backing plate N7, steel sleeve N8, splicing plate 30.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

With reference to Fig. 1, the cable girder anchorage structure of the railway steel truss cable-stayed bridge of the present utility model, it comprises the steel anchor box 10 that has a pair of anchor tie plate 11,12, and this pair of anchor tie plate 11,12 passes splicing plate 30 and high strength The bolts are connected to the upper chord gusset plates 20 on both sides of the main truss. The steel anchor box 10 is fixed with a steel casing N8 for the stay cable to pass through. The cable axis of the steel casing N8 intersects with the center line of the main truss node and the upper chord system line. The force transmission process is clear and the force transmission path is short. .

Referring to Fig. 2 and Fig. 3, the steel anchor box 10 also includes a well-shaped structure composed of a pair of partition plates N3 and a pair of vertical plates N2. An anchor backing plate N7 and a bottom cover plate N5 are welded on the front end of the well-shaped structure, and a top cover plate N4 is welded on the rear end, and the bottom cover plate N5 and the top cover plate N4 are welded with the anchor pull plates 11, 12 to form a seal box structure. The inside of the steel anchor box 10 is completely closed, which solves the anticorrosion problem inside the steel anchor box 10 well. The steel casing N8 passes through the bottom cover plate N5 and the top cover plate N4 and is fixed thereon by welding. Stiffeners N6 are arranged on the outer surface of the vertical plate N2, and the stiffeners N6 are welded to the vertical plate N2 and the anchor plate N7 to enhance the stability of the vertical plate and make the component stress more reasonable.

The cable beam anchoring structure of the utility model evenly distributes the concentrated force transmitted from the prestressed anchorage to the vertical plate N2 through the anchor plate N7, then transmits it to the anchor plate 11, 12, and finally transmits it evenly to the vertical plate N2 through the high-strength bolts. On the integral gusset plate of the upper chord of the steel truss girder, the combined force transmission member of the cable beam anchorage structure has a simple structure, which shortens the force transmission path and transmits the force evenly inside the anchorage structure, ensuring that each component of the anchorage structure will not be oversized. local deformation. The vertical plate of the anchorage structure is provided with partition plate N3 and stiffener N6 to enhance the stability of the vertical plate and make the component stress more reasonable.

The above are just some principles of the anchorage structure of the utility model railway steel truss cable-stayed bridge with illustrations, not to limit the utility model to the specific structure and scope of application shown and described, so all possible The corresponding modifications and equivalents used all belong to the patent scope of the utility model application.

Claims (5)

1. Railway Steel Truss cable stayed bridge cable beam anchoring structure, it is characterized in that: it comprises the steel anchor box (10) with a pair of anchor arm-tie (11,12), this is connected by scab (30) and high-strength bolt and the main truss both sides gusset plate (20) that winds up anchor arm-tie (11,12); Be set with the steel sleeve (N8) that passes for suspension cable in the steel anchor box (10), the suspension cable axis of steel sleeve (N8) and main truss node center line, the system line of winding up cross.

2. Railway Steel Truss cable stayed bridge cable beam anchoring structure as claimed in claim 1, it is characterized in that: described steel anchor box (10) also comprises the groined type structure that is made of a pair of demarcation strip (N3) and a pair of riser (N2), the transverse ends of riser (N2) and anchor arm-tie (11,12) welding.

3. as Railway Steel Truss cable stayed bridge cable beam anchoring structure as described in the claim 2, it is characterized in that: be welded with anchor plate (N7) and bottom plate (N5) on the front end of described groined type structure, be welded with lamina tecti (N4) on the rear end, bottom plate (N5), lamina tecti (N4) and the box structure that seals with anchor arm-tie (11,12) welding formation.

4. as Railway Steel Truss cable stayed bridge cable beam anchoring structure as described in the claim 3, it is characterized in that: described steel sleeve N8 passes bottom plate (N5), lamina tecti (N4) and is fixedly welded on it.

5. as Railway Steel Truss cable stayed bridge cable beam anchoring structure as described in the claim 4, it is characterized in that: described riser (N2) outer surface is provided with stiffening rib (N6), stiffening rib (N6) and riser (N2), anchor plate (N7) welding.

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