Catwalk arrangement method for different sag four-main-cable suspension bridge

Abstract

The application discloses a catwalk arrangement method of different sag four-main-cable suspension bridges and relates to the field of bridge engineering. The catwalk arrangement method comprises the following steps: the center distance of two main cables inside and outside on the transverse bridge is L, and the center distance is compared with the catwalk cross section design value; when the center distance is less than the catwalk cross section design value, one catwalk with the catwalk cross section design value is arranged for each main cable, and the part of the catwalk between the centers of the two main cables in the transverse bridge direction is defined as a first catwalk, and the remaining part is defined as a second catwalk, wherein the width of the two first catwalks in the transverse bridge direction is less than L; the main cable erection device is arranged on the second catwalk, and the main cable erection devices of the two main cables inside and outside on one side form a traction system. The catwalk can meet the construction scene of different distances between the main cables inside and outside and can be used for building the catwalks of different sag four-main-cable suspension bridges.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge engineering, in particular to a catwalk arrangement method of a different sag four-main-cable suspension bridge. BACKGROUND

[0002] At present, most of the suspension bridges at home and abroad are double-cable suspension bridges, and the catwalk structure design and arrangement of main cable construction tend to be stable. With the increase of main span span and live load, the problem of oversize structure components such as main cable, cable saddle, cable clamp and anchorage is caused by the double-main-cable arrangement, which makes the manufacturing requirement high, the construction difficult and the economic benefit low, so scholars at home and abroad put forward the four-cable suspension bridge structure system and first apply it abroad.

[0003] However, the four-main-cable system suspension bridge is currently arranged in parallel with four main cables, and the mechanical properties are basically the same as those of the traditional double-cable suspension bridge, and the catwalk structure can also be combined into a whole catwalk according to the main cable spacing characteristics, and the realization is relatively simple. However, for the different sag four-main-cable suspension bridge, the single-side two-main-cable always changes at the same section height difference, and is greatly affected by the main cable spacing, so there are certain difficulties and restrictions in the catwalk layout process. SUMMARY

[0004] In view of the defects in the prior art, the technical problem solved by the present application is how to build a catwalk of a different sag four-main-cable suspension bridge.

[0005] In order to achieve the above purpose, the catwalk arrangement method of the different sag four-main-cable suspension bridge provided by the present application comprises the following steps:

[0006] The center distance of the single-side inner and outer two main cables on the transverse bridge is L, L takes the minimum value and is compared with the catwalk transverse section design value;

[0007] When it is not less than the catwalk transverse section design value, a catwalk with the catwalk transverse section design value is erected for each main cable, and the catwalk is located directly below the main cable, and traction devices are arranged on both sides of the catwalk in the transverse bridge direction;

[0008] When it is less than the catwalk transverse section design value, a catwalk with the catwalk transverse section design value is erected for each main cable, and the part of the catwalk between the centers of the inner and outer two main cables in the transverse bridge direction is defined as a first catwalk, and the remaining part is defined as a second catwalk, wherein the width of the two first catwalks in the transverse bridge direction is less than L; main cable erecting devices are arranged in the second catwalk, and the main cable erecting devices of the single-side inner and outer two main cables form a traction system.

[0009] On the basis of the above technology, after setting a catwalk with catwalk cross-section design value for each main cable, before setting the main cable erecting device on the second catwalk, the following steps are further included: catwalk portal is arranged on the catwalk of the inner and outer main cables, bracket is installed at the bottom of the catwalk of the main cable with higher height, and the bracket is connected with the catwalk portal of the other main cable through damping device.

[0010] On the basis of the above technology, after setting a catwalk with catwalk cross-section design value for each main cable, the following steps are further included: the load bearing cable of the catwalk of the inner and outer main cables is bypassed through displacement around the main cable saddle.

[0011] On the basis of the above technology, after setting a catwalk with catwalk cross-section design value for each main cable, the following steps are further included: the catwalks of the inner and outer main cables are pulled down to the same horizontal line on the side close to the tower.

[0012] On the basis of the above technology, the catwalk includes:

[0013] Load bearing cable;

[0014] Catwalk load bearing plate, including outer load bearing plate arranged on the load bearing cable;

[0015] Catwalk portal, arranged on the top of the catwalk load bearing plate.

[0016] On the basis of the above technology, the main cable erecting device includes guide wheel, tractor and traction cable, the guide wheel is arranged on the top of the outer load bearing plate and inside the catwalk portal, the tractor is arranged on the catwalk portal on the top of the tower, and the traction cable is connected to the other end of the catwalk through the one end of the catwalk and the tractor.

[0017] On the basis of the above technology, the traction system includes two main cable erecting devices, steering device and winch, one end of the two traction cables is connected through the steering device, and the other end of the two traction cables is connected with the winch.

[0018] On the basis of the above technology, the catwalk load bearing surface of the higher main cable among the inner and outer main cables is provided with bracket at the bottom, and damping device is connected between the bracket and the catwalk portal of the lower main cable.

[0019] On the basis of the above technology, the catwalk close to the tower is provided with pull-down device for pulling down the catwalks of the inner and outer main cables to the same horizontal plane.

[0020] On the basis of the above technology, the top surface of the tower is provided with a plurality of main cable saddles, and the side of the pull-down device away from the tower is provided with displacement frame for deviating the catwalk on the top of the tower from the directly above of the main cable saddle.

[0021] Compared with the prior art, the advantages of the present application are:

[0022] This invention proposes a method for constructing catwalks on suspension bridges, which involves separately constructing the catwalks for the inner and outer main cables on one side. A matching main cable erection system is also designed for this method. Compared to existing methods that combine the catwalks of two main cables on one side into a single integrated catwalk, the catwalks of this invention can be constructed separately without mutual interference. Furthermore, it can accommodate construction scenarios with varying spacing between the inner and outer main cables. Therefore, this catwalk arrangement method has good applicability and can be used to construct catwalks for four-main-cable suspension bridges with different sags. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating the catwalk layout method for a four-main-cable suspension bridge with different sags in an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the catwalk structure of a four-main-cable suspension bridge with different sags in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the traction system in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the displacement frame and pull-down device in an embodiment of the present invention;

[0027] Figure 5 for Figure 4 Top view.

[0028] In the diagram: 1-Main cable, 2-Catwalk support plate, 201-Outer support plate, 202-Inner support plate, 203-Guide wheel, 204-Catwalk gantry, 205-Traction device, 206-Traction cable, 207-Damping device, 3-Steering device, 4-Wind, 5-Positioning frame, 6-Pull-down device, 7-Construction platform, 8-Tower body, 9-Main cable saddle. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] See Figure 1 As shown in the embodiment of the present invention, the method for arranging the catwalk of a four-main-cable suspension bridge with different sags includes the following steps:

[0031] S1: As can be seen from the design drawings, the center-to-center distance between the two main cables 1 on the inner and outer sides of one side on the cross bridge is L;

[0032] S2: Comparison of the minimum value of L (L may be a range value) with the cross-sectional design value of the catwalk (the conventional width of the catwalk is about 4m);

[0033] S3: According to the comparison result, the catwalk is built.When the catwalk cross-section design value is not less than the catwalk cross-section design value, one catwalk with the catwalk cross-section design value is erected for each main cable 1, and the catwalk is located directly below the main cable 1 (here, "directly below" means that the catwalk is located below the main cable), and the center line of the main cable can divide the catwalk into two equal parts on the left and right, and the traction device is arranged on both sides of the catwalk in the transverse bridge direction;

[0034] When the catwalk cross-section design value is less than the catwalk cross-section design value, one catwalk with the catwalk cross-section design value is erected for each main cable 1, and the catwalk is located between the centers of the inner and outer main cables 1 in the transverse bridge direction, and the part is defined as the first catwalk, and the remaining part is defined as the second catwalk, wherein the width of the two first catwalks in the transverse bridge direction is less than L, and it can be inferred that the width of the second catwalk needs to be greater than half of the catwalk cross-section design value; the main cable erection device is arranged in the second catwalk, and the main cable erection devices of the single-sided inner and outer main cables 1 constitute a traction system.

[0035] Therefore, the catwalk of the suspension bridge is built by the arrangement method, the catwalk of the single-sided inner and outer main cables 1 is built in a separated manner, and the main cable erection system matched with the arrangement method is designed. Compared with the existing catwalk which combines the catwalks of the two main cables into one integral catwalk, the catwalk of the present application can be built in a separated manner, the two catwalks do not affect each other, and the construction scene of different inner and outer main cable spacings can be met, so that the arrangement method of the catwalk has good applicability, and the catwalk of the different sag four main cable suspension bridges can be built.

[0036] Preferably, after the catwalk with the catwalk cross-section design value is erected for each main cable 1, the main cable erection device is arranged in the second catwalk, and the catwalk door frame 204 is arranged on the catwalk of the inner and outer main cables 1, and the corbel is installed at the bottom of the main cable 1 catwalk with high main cable 1, and the corbel is connected with the catwalk door frame 204 of the other main cable 1 through the damping device 207.

[0037] The benefits of such design are that the left and right swinging of the catwalks of the inner and outer main cables 1 due to the influence of the natural environment is avoided, so that the collision of the two catwalks is avoided, and the structure is designed to prevent the collision between the catwalks.

[0038] Preferably, after the catwalk with the catwalk cross-section design value is erected for each main cable 1, the catwalk of the inner and outer main cables 1 is bypassed through the displacement of the load bearing cable around the main cable saddle 9.

[0039] The benefits of such design are that the load bearing cable of the catwalk on the tower body is relatively closed, so the load bearing cable of this section is heavier, and the position of the catwalk is bypassed above the main cable saddle 9 to avoid adversely affecting the normal work of the main cable saddle 9.

[0040] Preferably, after installing a catwalk with a catwalk cross-sectional design value for each main cable 1, the following steps are also included: pulling down the catwalks of the inner and outer main cables 1 on the near tower side until they are at the same horizontal level.

[0041] The advantage of this design is that it allows for the adjustment of two catwalks with different elevations, bringing them to a point where they are roughly on the same horizontal plane, thus facilitating construction.

[0042] Preferred, see Figure 2 As shown, when L is less than the design value of the catwalk cross-section, the catwalk designed in this invention includes:

[0043] Load-bearing cable;

[0044] Catwalk load-bearing plate 2, which includes an outer load-bearing plate 201 and an inner load-bearing plate 202;

[0045] Catwalk gantry 204 is located at the top of the catwalk load-bearing plate 2, where guide wheels 203 are provided;

[0046] The advantage of this design is that, through the arrangement of the catwalks for the suspension bridge, the catwalks of the inner and outer main cables 1 on one side are constructed separately, and a matching main cable erection system is designed for this construction method. The catwalks of this invention can be constructed separately without mutual interference between the two catwalks, and can accommodate construction scenarios with different spacing between the inner and outer main cables. Therefore, this catwalk arrangement method has good applicability and can be used to construct catwalks for four-main-cable suspension bridges with different sags.

[0047] Preferably, the main cable erection device includes a guide wheel 203, a puller 205, and a pull cable 206. The guide wheel 203 is located on the top of the outer load-bearing plate 201 and inside the catwalk gantry 204. The puller 205 is located on the catwalk gantry 204 at the top of the tower body 8. The pull cable 206 is connected to the other end of the catwalk through one end of the catwalk and the puller 205.

[0048] The advantage of this design is that it is used for the installation of two main cables 1 on one side, inside and outside. Due to the space limitations of the catwalk, the above design was made.

[0049] Preferred, see Figure 3 As shown, the traction system includes two main cable erection devices, a steering device 3 and a winch 4. One end of each of the two traction cables 206 is connected through the steering device 3, and the other end is connected to the winch 4.

[0050] The advantage of the design is that the first catwalk has a small space and cannot lay the guide wheel 203, so that the main cable erection device of the inner and outer main cables 1 forms a traction system, thereby realizing the traction of the main cable 1.

[0051] Preferably, referring to Figure 2 As shown, the bottom of the catwalk load-bearing surface of the higher catwalk of the inner and outer main cables 1 is provided with a corbel, and the corbel is connected with the catwalk portal 204 of the lower catwalk through a damping device 207.

[0052] The advantage of the design is that the catwalks of the inner and outer main cables 1 can avoid left and right swinging due to the influence of the natural environment, thereby avoiding the collision of the two catwalks.

[0053] Preferably, referring to Figure 4 , 5 As shown, the catwalk near the tower body 8 is provided with a pull-down device 6, which is used to pull down the catwalks of the inner and outer main cables 1 to the same horizontal plane.

[0054] The advantage of the design is that the two catwalks with height difference can be adjusted to be basically in the same horizontal plane, thereby facilitating the construction.

[0055] Preferably, referring to Figure 4 , 5 As shown, the top surface of the tower body 8 is provided with a plurality of main cable saddles 9, and the side of the pull-down device 6 away from the tower body 8 is provided with a displacement frame 5, which is used to offset the catwalk at the top of the tower body 8 from the top of the main cable saddle 9.

[0056] The advantage of the design is that the load-bearing cable of the catwalk on the tower body is relatively closed, so the load-bearing cable of this section is relatively heavy, and the position of the catwalk is bypassed above the main cable saddle 9 to avoid adversely affecting the normal work of the main cable saddle 9.

[0057] Preferably, referring to Figure 4 As shown, the two sides of the tower body 8 are provided with a construction platform 7 along the longitudinal bridge direction.

[0058] The advantage of the design is that the construction platform 7 can facilitate the installation of the pull-down device 6 and the displacement frame 5, and reduce the risk of high-altitude operation.

[0059] The present application is not limited to the above-mentioned embodiments, and those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements are also considered to be within the protection scope of the present application. The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

Claims

1. A method for arranging catwalks in a four-main-cable suspension bridge with different sags, characterized in that, It includes the following steps: The center-to-center distance between the two main cables (1) on the cross bridge is L. The minimum value of L is taken and compared with the design value of the cross section of the catwalk. When the cross-sectional design value of the catwalk is not less than that of the catwalk, a catwalk with the cross-sectional design value is erected for each main cable (1), and the catwalk is located directly below the main cable (1). Traction devices are set on both sides of the catwalk in the transverse direction. When the cross-sectional design value of the catwalk is less than the design value, a catwalk with the cross-sectional design value is erected for each main cable (1), and the part of the catwalk located between the center of the inner and outer main cables (1) in the transverse direction is defined as the first catwalk, and the remaining part is defined as the second catwalk. The sum of the widths of the two first catwalks in the transverse direction is less than L. A main cable erection device is set up in the second catwalk, and the main cable erection device of the inner and outer main cables (1) on one side constitutes the traction system. After erecting a catwalk with a catwalk cross-sectional design value for each main cable (1) and before setting up the main cable erection device for the second catwalk, the following steps are also included: catwalk gantry (204) is set up on the catwalks of both the inner and outer main cables (1), a bracket is installed at the bottom of the catwalk of the main cable (1) with higher height, and the bracket is connected to the catwalk gantry (204) of the other main cable (1) through a damping device (207); After installing a catwalk with a catwalk cross-sectional design value for each main cable (1), the following steps are also included: pull down the catwalks of the inner and outer main cables (1) on the near tower side until they are at the same horizontal level.

2. The method for arranging catwalks for a four-main-cable suspension bridge with different sags as described in claim 1, characterized in that, After erecting a catwalk with a catwalk cross-section design value for each main cable (1), the following steps are also included: the load-bearing cables of the catwalks of the inner and outer main cables (1) are rotated to bypass the main cable saddle (9).

3. The method for arranging catwalks for a four-main-cable suspension bridge with different sags as described in claim 1, characterized in that, The cat walkway includes: Load-bearing cable; Catwalk load-bearing plate (2), which includes an outer load-bearing plate (201) disposed on the load-bearing cable. Catwalk gantry (204) is installed on top of the catwalk load-bearing plate (2).

4. The method for arranging catwalks for a four-main-cable suspension bridge with different sags as described in claim 3, characterized in that: The main cable erection device includes a guide wheel (203), a puller (205), and a pull cable (206). The guide wheel (203) is located on the top of the outer load-bearing plate (201) and inside the catwalk gantry (204). The puller (205) is located on the catwalk gantry (204) at the top of the tower body (8). The pull cable (206) is connected to the other end of the catwalk through one end of the catwalk and the puller (205).

5. The method for arranging catwalks for a four-main-cable suspension bridge with different sags as described in claim 4, characterized in that: The traction system includes two main cable erection devices, a steering device (3) and a winch (4). One end of each of the two traction cables (206) is connected through the steering device (3), and the other end is connected to the winch (4).

6. The method for arranging catwalks for a four-main-cable suspension bridge with different sags as described in claim 3, characterized in that: The higher catwalk load-bearing surface of the two main cables (1) has a corbel at its bottom, and a damping device (207) is connected between the corbel and the lower catwalk gantry (204).

7. The method for arranging catwalks for a four-main-cable suspension bridge with different sags as described in claim 4, characterized in that: A pull-down device (6) is installed on the catwalk near the tower body (8) to pull down the catwalks of the inner and outer main cables (1) to the same horizontal plane.

8. The method for arranging catwalks for a four-main-cable suspension bridge with different sags as described in claim 7, characterized in that: Several main cable saddles (9) are installed on the top surface of the tower body (8). A displacement frame (5) is installed on the side of the pull-down device (6) away from the tower body (8), which is used for the catwalk at the top of the tower body (8) to be offset from the main cable saddles (9).

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