Catwalk bearing cable erection method for synchronous construction of steel bridge tower swivel

Abstract

The application is a catwalk bearing cable erection method for synchronous construction of a steel bridge tower swivel, comprising the following steps: setting an assembling bed frame on a suspension bridge deck, and completing assembly of a tower column movable section of the steel bridge tower; installing a steel bridge tower vertical swivel system; installing catwalk bearing cables; tensioning a vertical swivel system traction cable to make the tower column movable section start vertical swivel, and removing the assembling bed frame; with the vertical swivel of the tower column movable section, continuously reversing the first catwalk bearing cable reel and continuously releasing the second catwalk bearing cable reel to realize overall aerial erection of the catwalk bearing cables; welding the tower column movable sections and the tower column fixed sections on the upper and lower sides of the swivel hinge structure when the tower column movable section is vertically swiveled into place, cutting off the swivel hinge structure, and removing the steel bridge tower vertical swivel system; preliminarily adjusting the length of the catwalk bearing cables; and secondly adjusting the length of the catwalk bearing cables. The application can simultaneously erect multiple bearing cables, does not need to use a traditional reciprocating traction system, has high construction efficiency, and has good economic benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of suspension bridge construction, and particularly relates to a catwalk load bearing cable erection method for synchronous construction with steel bridge tower rotation. BACKGROUND

[0002] When the steel tower of a suspension bridge is hoisted in segments, high-altitude welding leads to difficulty in controlling the linear shape and installation precision of the tower column, and the construction safety and appearance quality of the structure are difficult to guarantee. When the weight of the steel tower column segment is large, the requirements for hoisting equipment are high, therefore, horizontal assembly and vertical rotation construction becomes a commonly used construction method for the steel tower. The catwalk load bearing cable is usually erected after the steel tower is erected, and then a reciprocating traction system is used to erect the catwalk load bearing cable one by one. This erection method is slow and has a long construction period. Therefore, a fast and efficient catwalk load bearing cable erection method is needed. SUMMARY

[0003] The present application aims to solve the problems of the prior art, and provides a catwalk load bearing cable erection method for synchronous construction with steel bridge tower rotation.

[0004] To achieve the above-mentioned purpose, the following technical scheme is adopted: a catwalk load bearing cable erection method for synchronous construction with steel bridge tower rotation, comprising the following steps:

[0005] S1, assembling a jig on the deck of the suspension bridge, and assembling the movable segment of the steel bridge tower on the jig;

[0006] S2, installing a vertical rotation system of the steel bridge tower;

[0007] The vertical rotation system of the steel bridge tower comprises a rotation hinge structure, a tower structure, a steering cable saddle, a vertical rotation system traction cable, a tower column traction cable anchor point, a traction cable jack anchoring system, a vertical rotation system back cable, a tower column back cable anchor point, and a back cable jack anchoring system. The rotation hinge structure is installed at the position of the fixed segment of the tower column that has been completed above the deck, the movable segment of the tower column is connected with the rotation hinge structure, the tower structure is installed on the deck on the side away from the assembling jig of the steel bridge tower, a pair of steering cable saddles are installed at the top of the two ends of the tower structure in the longitudinal direction of the bridge, the tower column traction cable anchor point and the tower column back cable anchor point are installed on the two sides of the movable segment of the tower column in the longitudinal direction of the bridge, the traction cable jack anchoring system and the back cable jack anchoring system are installed on the two sides of the deck of the suspension bridge in the longitudinal direction of the bridge, one end of the vertical rotation system traction cable is connected with the tower column traction cable anchor point, the other end passes through the steering cable saddle and is connected with the traction cable jack anchoring system, one end of the vertical rotation system back cable is connected with the tower column back cable anchor point, and the other end is connected with the back cable jack anchoring system;

[0008] S3, keeping the movable segment of the tower column stationary on the assembling jig, and installing the catwalk load bearing cable;

[0009] The first load-bearing cable anchoring preformed member and the second load-bearing cable anchoring preformed member are respectively arranged on the longitudinal bridge sides of the tower activity section, the first catwalk load-bearing cable reel is arranged on the bridge deck on the side away from the tower structure of the longitudinal bridge of the back cable jack anchoring system and close to the outermost side pier, the second catwalk load-bearing cable reel is arranged on the bridge deck on the side away from the tower structure of the longitudinal bridge of the back cable jack anchoring system and close to the outermost side pier, the first catwalk load-bearing cable is drawn out of the first catwalk load-bearing cable reel and sequentially connected to the first load-bearing cable anchoring preformed member, and the second catwalk load-bearing cable is drawn out of the second catwalk load-bearing cable reel and sequentially connected to the second load-bearing cable anchoring preformed member.

[0010] S4, the tower activity section starts vertical rotation, the assembly jig is removed, with the vertical rotation of the tower activity section, the first catwalk load-bearing cable reel is continuously reversely tightened, the length of the first catwalk load-bearing cable is reduced, the second catwalk load-bearing cable reel is continuously released, the length of the second catwalk load-bearing cable is increased, and the overall aerial erection of the catwalk load-bearing cable is realized.

[0011] S5, the tower activity section is vertically rotated to the position, the tower activity section and the tower fixed section on the upper and lower sides of the rotation hinge structure are welded, the rotation hinge structure is cut off, the steel tower column system conversion is completed, and the steel bridge tower vertical rotation system is removed.

[0012] S6, preliminary adjustment of the length of the catwalk load-bearing cable is performed.

[0013] S7, the second adjustment of the length of the catwalk load-bearing cable is performed, so that the catwalk load-bearing cable reaches the design position, and the overall erection of the catwalk load-bearing cable is completed.

[0014] In particular, the number of vertical rotation system traction cables is not less than four groups, and the number of vertical rotation system back cables is not less than two groups.

[0015] In particular, the transverse spacing and number of the first catwalk load-bearing cable reel, the first catwalk load-bearing cable and the first load-bearing cable anchoring preformed member are the same, the transverse spacing and number of the second catwalk load-bearing cable reel, the second catwalk load-bearing cable and the second load-bearing cable anchoring preformed member are the same, the first load-bearing cable anchoring preformed member is arranged at a position two meters above the tower traction cable anchor point, and the second load-bearing cable anchoring preformed member is arranged at a position two meters above the tower back cable anchor point.

[0016] In particular, during the vertical rotation of the tower activity section, the spatial positions of the first catwalk load-bearing cable and the vertical rotation system traction cable are staggered and do not collide, and the spatial positions of the second catwalk load-bearing cable and the vertical rotation system back cable are staggered and do not collide.

[0017] In particular, after the tower activity section completes the vertical rotation and the steel bridge tower vertical rotation system is removed, preliminary adjustment of the length of the catwalk load-bearing cable is performed, that is, the first catwalk load-bearing cable reel is continuously reversely tightened, the second catwalk load-bearing cable reel is released, and the length of the catwalk load-bearing cable is greater than the design length by one meter.

[0018] Particularly, the first adjusting anchor beam is installed on the bridge deck of the first catwalk load cable drum in the longitudinal direction of the bridge away from the side of the traction cable jack anchoring system, and the second adjusting anchor beam is installed on the bridge deck of the second catwalk load cable drum in the longitudinal direction of the bridge away from the side of the back cable jack anchoring system.

[0019] Particularly, when the length of the catwalk load cable is adjusted for the second time, the first catwalk load cable is taken out from the first catwalk load cable drum and connected to the first adjusting anchor beam in sequence, and the second catwalk load cable is taken out from the second catwalk load cable drum and connected to the second adjusting anchor beam in sequence, from one side to the other side in the transverse direction of the bridge, and symmetrically on the left and right sides in the longitudinal direction of the bridge with the steel bridge tower as the center, the first adjusting anchor beam and the second adjusting anchor beam are connected to the corresponding pre-buried parts above the beam section through the pull rod, and the length adjustment of the catwalk load cable is realized by adjusting the length of the pull rod until the design requirements are met.

[0020] The beneficial effects of the present application are that the catwalk load cable erection is completed synchronously during the vertical rotation of the steel bridge tower, compared with the conventional method of first constructing the steel tower column and then erecting the catwalk load cable one by one, multiple load cables can be erected at the same time, and the traditional reciprocating traction system does not have to be used, a lot of time is saved, the construction efficiency is improved, and the economic benefit is good. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure schematic diagram of the steel bridge tower vertical rotation system installation completion in the present application S2.

[0022] Figure 2 It is a structure schematic diagram of the catwalk load cable installation completion in the present application S3.

[0023] Figure 3 It is a plan position diagram of the vertical rotation system traction cable, the vertical rotation system back cable, the first catwalk load cable and the second catwalk load cable in the present application.

[0024] Figure 4 It is a structure schematic diagram of the tower column movable section starting to rotate in the present application S4.

[0025] Figure 5 It is a structure schematic diagram of the tower column movable section rotating to the position in the present application S4.

[0026] Figure 6 It is a structure schematic diagram after the steel bridge tower vertical rotation system is removed in the present application S5.

[0027] Figure 7 It is a preliminary adjustment schematic diagram of the catwalk load cable length in the present application S6.

[0028] Figure 8It is the catwalk bearing cable length secondary adjustment schematic view of the present application S7;

[0029] Figure 9 It is the first adjustment anchor beam and pull rod, first catwalk bearing cable connection schematic view of the present application;

[0030] Figure 10 It is the second adjustment anchor beam and pull rod, second catwalk bearing cable connection schematic view of the present application;

[0031] In the figure: 1-assembly jig; 2-tower movable section; 3-turn hinge structure; 4-tower structure; 5-turning cable saddle; 6-vertical turning system traction cable; 7-tower traction cable anchor point; 8-traction cable jack anchoring system; 9-vertical turning system back cable; 10-tower back cable anchor point; 11-back cable jack anchoring system; 12-tower fixed section; 13-first bearing cable anchoring embedded part; 14-second bearing cable anchoring embedded part; 15-first catwalk bearing cable reel; 16-second catwalk bearing cable reel; 17-first catwalk bearing cable; 18-second catwalk bearing cable; 19-first adjustment anchor beam; 20-second adjustment anchor beam; 21-pull rod;

[0032] The present application will be described in detail below with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The present application will be described in detail below with reference to the accompanying drawings.

[0034] As Figures 1-10 shown, a catwalk bearing cable erection method for synchronous construction of a steel bridge tower body, comprising the following steps:

[0035] S1, setting an assembly jig 1 on the deck of a suspension bridge, and completing assembly of a tower movable section 2 of a steel bridge tower on the assembly jig 1;

[0036] S2, installing a vertical turning system of the steel bridge tower;

[0037] The steel bridge tower vertical rotation system comprises a rotation hinge structure 3, a tower structure 4, a steering cable saddle 5, a vertical rotation system traction cable 6, a tower column traction cable anchor point 7, a traction cable jack anchoring system 8, a vertical rotation system back cable 9, a tower column back cable anchor point 10, and a back cable jack anchoring system 11. The rotation hinge structure 3 is installed at the position of the completed tower column fixed section 12 above the bridge deck, the bottom of the tower column movable section 2 is connected with the rotation hinge structure 3, the tower structure 4 is installed on the bridge deck on the side away from the assembly jig 1 of the steel bridge tower, a pair of steering cable saddles 5 are installed at the top longitudinal bridge direction two ends of the tower structure 4, the tower column traction cable anchor point 7 and the tower column back cable anchor point 10 are respectively installed on the longitudinal bridge direction two sides of the tower column movable section 2, the traction cable jack anchoring system 8 and the back cable jack anchoring system 11 are respectively installed on the longitudinal bridge direction two sides of the suspension bridge deck, one end of the vertical rotation system traction cable 6 is connected with the tower column traction cable anchor point 7, the other end passes through the steering cable saddle 5 and is connected with the traction cable jack anchoring system 8, one end of the vertical rotation system back cable 9 is connected with the tower column back cable anchor point 10, and the other end is connected with the back cable jack anchoring system 11. The number of the vertical rotation system traction cable 6 is not less than four groups, and the number of the vertical rotation system back cable 9 is not less than two groups.

[0038] S3, keep the tower column movable section 2 on the assembly jig 1, install the catwalk bearing cable;

[0039] The first bearing cable anchoring preformed member 13 and the second bearing cable anchoring preformed member 14 are respectively installed on the longitudinal bridge direction two sides of the tower column movable section 2, the first catwalk bearing cable drum 15 is installed on the bridge deck on the side away from the tower structure 4 of the traction cable jack anchoring system 8 near the outermost side pier position, the second catwalk bearing cable drum 16 is installed on the bridge deck on the side away from the tower structure 4 of the back cable jack anchoring system 11 near the outermost side pier position, the first catwalk bearing cable 17 is drawn out of the first catwalk bearing cable drum 15 and connected on the first bearing cable anchoring preformed member 13 in turn, and the second catwalk bearing cable 18 is drawn out of the second catwalk bearing cable drum 16 and connected on the second bearing cable anchoring preformed member 14 in turn; the installation of the catwalk bearing cable is to install a sufficient number of all catwalk bearing cables according to the erection of the main cable of the suspension bridge before the vertical rotation of the tower column movable section 2, and the number is usually 4-10; the transverse spacing and number of the first catwalk bearing cable drum 15, the first catwalk bearing cable 17 and the first bearing cable anchoring preformed member 13 are the same, the transverse spacing and number of the second catwalk bearing cable drum 16, the second catwalk bearing cable 18 and the second bearing cable anchoring preformed member 14 are the same, the first bearing cable anchoring preformed member 13 is at the position of about two meters above the tower column traction cable anchor point 7, and the second bearing cable anchoring preformed member 14 is at the position of about two meters above the tower column back cable anchor point 10;

[0040] S4, the vertical rotation system traction cable 6, so that the tower movable section 2 starts vertical rotation, disassembly of the assembly jig 1, with the tower movable section 2 vertical rotation, constantly reverse tightening the first catwalk bearing cable reel 15, reduce the length of the first catwalk bearing cable 17, so that the first catwalk bearing cable 17 in the tower movable section 2 always keep suspended state during the rotation, constantly release the second catwalk bearing cable reel 16, increase the length of the second catwalk bearing cable 18, so that the second catwalk bearing cable 18 in the tower movable section 2 rotation process is not tight, realize the overall catwalk bearing cable erection in the air; the first catwalk bearing cable 17 and vertical rotation system traction cable 6 spatial position during the tower movable section 2 vertical rotation, do not collide, the second catwalk bearing cable 18 and vertical rotation system back cable 9 spatial position do not collide;

[0041] S5, the tower movable section 2 vertical rotation to the right, welding hinge structure 3 on both sides of the tower movable section 2 and tower fixed section 12, cutting hinge structure 3, complete the steel tower system conversion, and remove the steel tower vertical rotation system;

[0042] S6, the preliminary adjustment of the catwalk bearing cable length; in the tower movable section 2 complete vertical rotation and remove the steel tower vertical rotation system after, continue to reverse tightening the first catwalk bearing cable reel 15, release the second catwalk bearing cable reel 16, so that the catwalk bearing cable length is greater than the design length of about one meter;

[0043] S7, the second adjustment of the catwalk bearing cable length, so that the catwalk bearing cable reaches the design position, complete the overall catwalk bearing cable erection; in the first catwalk bearing cable reel 15 longitudinal bridge away from traction cable jack anchorage system 8 side of the bridge deck near the outermost side pier position at the installation of the first adjustment anchor beam 19, in the second catwalk bearing cable reel 16 longitudinal bridge away from back cable jack anchorage system 11 side of the bridge deck near the outermost side pier position at the installation of the second adjustment anchor beam 20; catwalk bearing cable length second adjustment, in the bridge two side beam end position in a certain order, specific for: in the bridge transverse direction from one side to the other side, in the longitudinal bridge direction of the steel tower as the center, left and right side symmetry of the first catwalk bearing cable 17 from the first catwalk bearing cable reel 15 and in turn connected to the first adjustment anchor beam 19, the second catwalk bearing cable 18 from the second catwalk bearing cable reel 16 and in turn connected to the second adjustment anchor beam 20, the first adjustment anchor beam 19, the second adjustment anchor beam 20 is connected through the pull rod 21 with the corresponding embedded in the beam section above the embedded part, through the adjustment of the length of the pull rod 21 to realize the adjustment of the catwalk bearing cable length, until the design requirements.

[0044] The present application synchronously completes catwalk bearing cable erection during vertical rotation of the steel bridge tower, compared with the conventional method of first constructing the steel tower column and then erecting catwalk bearing cables one by one, multiple bearing cables can be erected simultaneously, and the traditional reciprocating traction system does not have to be used, a large amount of time is saved, the construction efficiency is improved, and the economic benefit is good.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0046] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0047] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] The above has exemplarily described the present application, and it is obvious that the specific implementation of the present application is not limited by the above-mentioned manner, and various improvements using the method concept and technical solution of the present application, or direct application to other occasions without improvement, are all within the protection scope of the present application.

Claims

1. A method for erecting catenary load-bearing cables during synchronous construction with the rotation of a steel bridge tower, characterized in that, Includes the following steps: S1. Set up an assembly frame (1) on the bridge deck of the suspension bridge and assemble the movable section (2) of the steel bridge tower on the assembly frame (1); S2. Install the steel bridge tower vertical rotation system; The steel bridge tower vertical rotation system includes a hinge structure (3), a tower structure (4), a steering saddle (5), a vertical rotation system traction cable (6), a tower column traction cable anchor point (7), a traction cable jack anchoring system (8), a vertical rotation system back cable (9), a tower column back cable anchor point (10), and a back cable jack anchoring system (11). The hinge structure (3) is installed at the top of the completed tower column fixed section (12) above the bridge deck. The bottom of the tower column movable section (2) is connected to the hinge structure (3). The tower structure (4) is installed on the bridge deck on the side of the steel bridge tower away from the assembly jig (1). A pair of steering saddles (5) are installed on the bridge deck. At the two ends of the tower structure (4) in the longitudinal direction of the bridge, the tower traction cable anchor point (7) and the tower back cable anchor point (10) are respectively installed on both sides of the tower movable section (2) in the longitudinal direction of the bridge. The traction cable jack anchoring system (8) and the back cable jack anchoring system (11) are respectively installed on both sides of the suspension bridge deck in the longitudinal direction of the bridge. One end of the vertical rotation system traction cable (6) is connected to the tower traction cable anchor point (7), and the other end is connected to the traction cable jack anchoring system (8) through the steering cable saddle (5). One end of the vertical rotation system back cable (9) is connected to the tower back cable anchor point (10), and the other end is connected to the back cable jack anchoring system (11). S3. Keep the movable section (2) of the tower column stationary on the assembly frame (1) and install the catwalk load-bearing cable; Install the first load-bearing cable anchorage pre-embedded part (13) and the second load-bearing cable anchorage pre-embedded part (14) on both sides of the longitudinal bridge of the tower column movable section (2). Install the first catwalk load-bearing cable disc (15) on the bridge deck of the traction cable jack anchorage system (8) on the side away from the tower structure (4) and near the outermost side pier. Install the second catwalk load-bearing cable disc (16) on the bridge deck of the back cable jack anchorage system (11) on the side away from the tower structure (4) and near the outermost side pier. Pull out the first catwalk load-bearing cable (17) from the first catwalk load-bearing cable disc (15) and connect it to the first load-bearing cable anchorage pre-embedded part (13) in sequence. Pull out the second catwalk load-bearing cable (18) from the second catwalk load-bearing cable disc (16) and connect it to the second load-bearing cable anchorage pre-embedded part (14) in sequence. S4. Tensioning the vertical rotation system traction cable (6) causes the tower column movable section (2) to begin vertical rotation. The assembly frame (1) is dismantled. As the tower column movable section (2) rotates vertically, the first catwalk load-bearing cable reel (15) is continuously tightened in the opposite direction to reduce the length of the first catwalk load-bearing cable (17). The second catwalk load-bearing cable reel (16) is continuously released to increase the length of the second catwalk load-bearing cable (18), thus realizing the overall aerial erection of the catwalk load-bearing cable. S5. The tower column movable section (2) is vertically rotated into place, and the hinge structure (3) is welded to the upper and lower sides of the tower column movable section (2) and the tower column fixed section (12). The hinge structure (3) is cut off, the steel tower column system conversion is completed, and the steel bridge tower vertical rotation system is dismantled. S6. Make preliminary adjustments to the length of the catwalk load-bearing cables; S7. Make a second adjustment to the length of the catwalk load-bearing cable to bring it to the designed position and complete the overall erection of the catwalk load-bearing cable.

2. The method for erecting catenary load-bearing cables during synchronous construction with the rotation of the steel bridge tower, as described in claim 1, is characterized in that... The number of traction cables (6) in the vertical rotation system shall not be less than four sets, and the number of back cables (9) in the vertical rotation system shall not be less than two sets.

3. The method for erecting catenary load-bearing cables during synchronous construction with the rotation of the steel bridge tower, as described in claim 2, is characterized in that... The first load-bearing cable anchorage pre-embedded part (13) is located two meters above the tower column traction cable anchor point (7), and the second load-bearing cable anchorage pre-embedded part (14) is located two meters above the tower column back cable anchor point (10).

4. The method for erecting catenary load-bearing cables during synchronous construction with the rotation of the steel bridge tower, as described in claim 3, is characterized in that... During the vertical rotation of the tower column moving section (2), the first catwalk load-bearing cable (17) and the vertical rotation system traction cable (6) are spatially misaligned and do not collide. The second catwalk load-bearing cable (18) and the vertical rotation system back cable (9) are spatially misaligned and do not collide.

5. The method for erecting catenary load-bearing cables during synchronous construction with the rotation of the steel bridge tower, as described in claim 4, is characterized in that... After the vertical rotation of the tower column (2) is completed and the steel bridge tower vertical rotation system is dismantled, the length of the catwalk load-bearing cable is initially adjusted, that is, the first catwalk load-bearing cable disc (15) is tightened in the reverse direction and the second catwalk load-bearing cable disc (16) is released, so that the length of the catwalk load-bearing cable is one meter longer than the design length.

6. The method for erecting catenary support cables during synchronous construction with the rotation of the steel bridge tower, as described in claim 5, is characterized in that... A first adjusting anchor beam (19) is installed on the bridge deck near the outermost side pier on the side opposite to the traction cable jack anchoring system (8) in the longitudinal direction of the first catwalk load-bearing cable disc (15). A second adjusting anchor beam (20) is installed on the bridge deck near the outermost side pier on the side opposite to the back cable jack anchoring system (11) in the longitudinal direction of the second catwalk load-bearing cable disc (16).

7. The method for erecting catenary support cables during synchronous construction with the rotation of the steel bridge tower, as described in claim 6, is characterized in that... When adjusting the length of the catwalk load-bearing cable for the second time, in the transverse direction of the bridge, from one side to the other, and in the longitudinal direction of the bridge, with the steel bridge tower as the center, the first catwalk load-bearing cable (17) is taken out from the first catwalk load-bearing cable reel (15) and connected to the first adjusting anchor beam (19) in sequence. The second catwalk load-bearing cable (18) is taken out from the second catwalk load-bearing cable reel (16) and connected to the second adjusting anchor beam (20) in sequence. The first adjusting anchor beam (19) and the second adjusting anchor beam (20) are respectively connected to the corresponding embedded parts above the beam segment through tie rods (21). The length of the catwalk load-bearing cable is adjusted by adjusting the length of the tie rods (21) until the design requirements are met.

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