Suspension bridge continuous catwalk bearing cable displacement steel frame structure

Abstract

The present application relates to the field of bridge construction, especially to a suspension bridge continuous catwalk load cable displacement steel frame structure which can conveniently and effectively realize the tensioning or loosening operation of catwalk load cable, the structure is simple in structure, and the catwalk load cable displacement steel frame structure comprises a steel frame body, the steel frame body is a transverse frame extending in the horizontal direction, the two ends of the transverse frame are respectively provided with a fixed end and an adjusting end, the fixed end is provided with at least one catwalk load cable limiting structure, and the adjusting end is provided with at least one catwalk load cable adjusting structure, the catwalk load cable limiting structure and the catwalk load cable adjusting structure are one-to-one corresponding, the catwalk load cable is arranged between the catwalk load cable limiting structure and the catwalk load cable adjusting structure, and the catwalk load cable adjusting structure is used for tensioning or loosening the catwalk load cable, and the present application is especially suitable for the arrangement of the suspension bridge continuous catwalk load cable and the bridge body correction construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge construction, and particularly relates to a catwalk load cable displacement steel frame structure of a suspension bridge. BACKGROUND

[0002] When the catwalk load cable displacement steel frame structure of a suspension bridge is arranged, it needs to pass over the tower top, which leads to the conflict of the plane position and the main cable saddle position. Therefore, near the tower top position, an additional displacement steel frame structure is needed to change the position of the load cable from the position directly below the main cable of each span to the positions on both sides of the main cable saddle, and to reduce the in-plane spacing of the load cable. At present, the displacement mode of the catwalk load cable usually adopts the displacement of the transverse beam near the tower top and the pulling of the auxiliary device to meet the needs of the displacement of the load cable passing through the tower top. However, this operation is relatively cumbersome, and the closer to the tower top position, the smaller the distance between the main cable and the catwalk load cable, and the more difficult the operation. In addition, an additional truss type operation platform is needed, and workers work in the hanging basket, which increases the safety hazard. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a catwalk load cable displacement steel frame structure of a suspension bridge, which has a simple structure and can conveniently and effectively realize the tensioning or loosening operation of the catwalk load cable.

[0004] The technical scheme adopted by the present application to solve the technical problem is that the catwalk load cable displacement steel frame structure of a suspension bridge comprises a steel frame body, the steel frame body is a transverse frame extending in the horizontal direction, the two ends of the transverse frame are respectively provided with a fixed end and an adjusting end, the fixed end is provided with at least one catwalk load cable limiting structure, the adjusting end is provided with at least one catwalk load cable adjusting structure, the catwalk load cable limiting structure and the catwalk load cable adjusting structure are one-to-one correspondingly arranged, a catwalk load cable is arranged between the catwalk load cable limiting structure and the catwalk load cable adjusting structure, and the catwalk load cable adjusting structure tightens or loosens the catwalk load cable.

[0005] Further, the height of the fixed end is higher than the height of the adjusting end.

[0006] Further, the fixed end and the adjusting end both extend upward in the direction perpendicular to the transverse frame.

[0007] Further, the catwalk load cable limiting structure is a load cable limiting clamping plate, the load cable limiting clamping plate comprises an upper clamping plate and a lower clamping plate, the upper clamping plate and the lower clamping plate are both provided with a groove structure, and the catwalk load cable limiting structure is arranged in a limiting hole formed by the groove structures of the upper clamping plate and the lower clamping plate.

[0008] Further, the upper clamping plate and the lower clamping plate are connected in a detachable manner.

[0009] Further, the catwalk load bearing cable adjusting structure is a hydraulic adjusting device.

[0010] The beneficial effects of the present application are: in actual use, since the variable position steel frame structure is independently arranged, the variable position steel frame structure can be removed after the bridge is corrected, and the whole installation, use and disassembly process is very convenient. Secondly, in actual use, one end of the catwalk load bearing cable is connected with the bridge body to be corrected, the other end is connected with the catwalk load bearing cable adjusting structure, and during actual fine adjustment and correction, the catwalk load bearing cable is tightened or loosened through the catwalk load bearing cable adjusting structure, so as to realize fine adjustment and correction of the shell. Compared with the traditional way, the variable position steel frame structure can make installation and disassembly convenient, and can adjust the position and elevation of the load bearing cable. The present application is especially suitable for the arrangement of the catwalk load bearing cable of the suspension bridge and the bridge body correction construction. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a top view of the variable position steel frame structure.

[0012] Figure 2 is a schematic view of the adjusting end of the variable position steel frame structure.

[0013] Figure 3 is a schematic view of the fixed end of the variable position steel frame structure.

[0014] In the figure, the marks are: catwalk load bearing cable adjusting structure 11, catwalk load bearing cable 12, steel frame body 13, anti-skid clamp 14, catwalk load bearing cable limiting structure 15, handrail cable 16, fixed clamping plate 17, adjusting end A, fixed end B, first catwalk load bearing cable 1, second catwalk load bearing cable 2, third catwalk load bearing cable 3, fourth catwalk load bearing cable 4, fifth catwalk load bearing cable 5, sixth catwalk load bearing cable 6, seventh catwalk load bearing cable 7, and eighth catwalk load bearing cable 8. DETAILED DESCRIPTION

[0015] The present application will be further described below in combination with the drawings.

[0016] As Figure 1 , Figure 2 and Figure 3The suspension bridge continuous catwalk load-bearing cable displacement steel frame structure shown includes a steel frame body 13, which is a transverse frame extending horizontally. A fixed end B and an adjusting end A are respectively provided at both ends of the transverse frame. At least one catwalk load-bearing cable limiting structure 15 is provided at the fixed end B, and at least one catwalk load-bearing cable adjusting structure 11 is provided at the adjusting end A. The catwalk load-bearing cable limiting structure 15 and the catwalk load-bearing cable adjusting structure 11 are arranged in a one-to-one correspondence. A catwalk load-bearing cable 12 is provided between the catwalk load-bearing cable limiting structure 15 and the catwalk load-bearing cable adjusting structure 11. The catwalk load-bearing cable adjusting structure 11 tightens or loosens the catwalk load-bearing cable 12.

[0017] like Figure 1 As shown, there are a total of 8 catwalk support cables. Four of them are located on the left side near the steel frame body 13, and the other four are located on the right side near the steel frame body 13. Taking the four catwalk support cables as an example, at the fixed end B, these four catwalk support cables are limited by corresponding catwalk support cable limiting structures 15, meaning the catwalk support cables can slide along the catwalk support cable limiting structures 15. After these four catwalk support cables extend to the adjusting end A, they are evenly spaced and fixed by corresponding catwalk support cable adjusting structures 11. At this time, one end of the catwalk support cable is set on the catwalk support cable adjusting structure 11, and the other end is connected to the bridge body that needs fine-tuning and correction. By tightening or loosening the catwalk support cables 12 using the catwalk support cable adjusting structure 11, represented by a hydraulic adjusting device, the bridge body is corrected.

[0018] In actual installation, to ensure that the catwalk support cable at fixed end B can extend forward effectively and connect with the bridge structure, it is preferable that the height of fixed end B is higher than the height of adjustable end A. This allows the catwalk support cable to extend upward and cross obstructions on the side of the bridge structure. Furthermore, to better achieve the aforementioned guiding effect, it is preferable that both fixed end B and adjustable end A extend upward in a direction perpendicular to the transverse frame.

[0019] Regarding the specific structure of the catwalk load-bearing cable limiting structure 15, it is preferable that the catwalk load-bearing cable limiting structure 15 is a load-bearing cable limiting plate. The load-bearing cable limiting plate includes an upper plate and a lower plate, both of which are provided with groove structures. The catwalk load-bearing cable is disposed within a limiting channel formed by the groove structures of the upper and lower plates. The groove structures of the upper and lower plates form a limiting channel, which does not affect the stretching or relaxing effect when the catwalk load-bearing cable is stretched or relaxed, but ensures that the catwalk load-bearing cable is always in a constrained and limited state, preventing the catwalk load-bearing cable from deviating too far from the set position and causing safety hazards. Preferably, the upper and lower plates are detachably connected.

[0020] After the catwalk cable of the suspension bridge is installed, the corresponding control and correction can be carried out in the following manner:

[0021] I. In the empty cable erection stage of the catwalk cable, the unstressed length of each catwalk cable is different, and the unstressed length of each catwalk cable needs to be corrected by using geometric relationship to obtain the control elevation of each catwalk cable under the standard bridge tower state (no tower deviation, design tower height) and design temperature (20℃).

[0022] II. During the catwalk construction process, the deviation of the bridge tower, the change of the site temperature, the tower height and other factors will affect the linear shape of the catwalk cable. In order to ensure the erection accuracy, various factors are corrected to obtain the catwalk cable elevation that meets the design requirements.

[0023] III. The elevation change of the catwalk cable under different temperatures, spans and tower heights is calculated. According to the data change law, it can be judged that the elevation change of the catwalk cable is linearly related to the temperature change, the span change and the tower height change. The temperature, span and tower height correction coefficients of each catwalk cable are fitted and obtained as shown in Tables 1, 2 and 3. The elevation control point position of the catwalk cable center line and the elevation calculation formula are as follows:

[0024] x = X0 + D·K xD

[0025] y = Y0 + K yT ·(T-20) + D·K yD + (H1 + H2) × K yH

[0026] In the formula, x is the distance from the control point to the center line of the bridge tower considering various influences; y is the elevation of the control point considering various influences; KyT is the temperature correction coefficient; KxD and KyH are the span correction coefficients; KyH is the tower height correction coefficient; T is the measured temperature (℃); D is the span change (m) relative to the design position, and the span increase is positive and the span decrease is negative; H1 and H2 are the tower height change (m) of the A-end bridge tower and the B-end bridge tower relative to the design position, and the tower height increase is positive and the tower height decrease is negative. The midspan is the value point between the adjustment end A and the fixed end B.

[0027] Table 1 Span correction coefficient of catwalk cable

[0028]

[0029] Table 2 Span correction coefficient of catwalk cable

[0030]

[0031] Table 3 catway bearing cable tower height correction coefficient

[0032]

[0033] Four, using the above formula and each correction coefficient to adjust the catway bearing cable line shape. Table 4 is the catway bearing cable line shape after the installation of the variable position rigid frame.

[0034] Table 4 catway bearing cable line shape after the installation of the variable position rigid frame

[0035]

[0036] At this point, the catway bearing cable line shape can be adjusted based on the above data, thereby realizing the correction of the bridge body. Compared with the traditional way, the variable position rigid frame structure can facilitate installation and disassembly, and can adjust the position and elevation of the bearing cable. The present application is especially suitable for the arrangement of the catway bearing cable of the suspension bridge and the bridge body correction construction.

Claims

1. A continuous catwalk load-bearing cable displacement steel frame structure for a suspension bridge, the displacement steel frame structure shown includes a steel frame body (13), the steel frame body (13) is a transverse frame extending in the horizontal direction, and a fixed end (B) and an adjusting end (A) are respectively provided at both ends of the transverse frame, and at least one catwalk load-bearing cable limiting structure (15) is provided at the fixed end (B), characterized in that: Includes a middle span, which is disposed between the adjusting end (A) and the fixed end (B); The adjustment end (A) is provided with at least one catwalk load-bearing cable adjustment structure (11), and the catwalk load-bearing cable limiting structure (15) is provided in a one-to-one correspondence with the catwalk load-bearing cable adjustment structure (11). A catwalk load-bearing cable (12) is provided between the catwalk load-bearing cable limiting structure (15) and the catwalk load-bearing cable adjustment structure (11). By obtaining the coordinate values ​​of the adjustment end (A), the mid-span, the fixed end (B) and the tower offset, the catwalk load-bearing cable adjustment structure (11) can tighten or loosen the catwalk load-bearing cable (12) to achieve linear adjustment.

2. The continuous catwalk load-bearing cable displacement steel frame structure for suspension bridges as described in claim 1, characterized in that: The height of the fixed end (B) is higher than the height of the adjusting end (A).

3. The continuous catwalk load-bearing cable displacement steel frame structure for suspension bridges as described in claim 2, characterized in that: Both the fixed end (B) and the adjusting end (A) extend upward in a direction perpendicular to the transverse frame.

4. The continuous catwalk load-bearing cable displacement steel frame structure for suspension bridges as described in claim 1, 2, or 3, characterized in that: The catwalk load-bearing cable limiting structure (15) is a load-bearing cable limiting plate. The load-bearing cable limiting plate includes an upper plate and a lower plate. Both the upper plate and the lower plate are provided with a groove structure. The catwalk load-bearing cable is set in the limiting channel formed by the groove structure of the upper plate and the lower plate.

5. The continuous catwalk load-bearing cable displacement steel frame structure for suspension bridges as described in claim 4, characterized in that: The upper and lower card plates are detachably connected.

6. The continuous catwalk load-bearing cable displacement steel frame structure for suspension bridges as described in claim 1, 2, or 3, characterized in that: The catwalk load-bearing cable adjustment structure (11) is a hydraulic adjustment device.

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