Sightseeing device for bridge main tower and its installation method

Abstract

The present invention relates to a sightseeing device for a main tower of a bridge and an installation method thereof. The sightseeing device includes a sightseeing elevator, which comprises a plurality of segmented shafts and a plurality of pairs of wall supporting members. Each pair of wall supporting members is at the same horizontal height and is respectively arranged on both sides of the segmented shaft. The segmented shaft includes six columns and a ring beam. One column is respectively arranged at each of the four top corners of the segmented shaft, and one column is respectively arranged in the middle of two parallel sides of the segmented shaft facing the main tower. The ring beam is horizontally arranged and connects the six columns. The corresponding columns of the plurality of segmented shafts are vertically connected to form a vertical shaft, and the columns of the segmented shaft at the bottom of the shaft are embedded in the main tower pedestal. One end of the wall supporting member is connected to the column of the corresponding segmented shaft, and the other end is connected to the corresponding side of the main tower. The wall supporting member includes two main rods arranged parallel to each other up and down and a plurality of diagonal rods connected between the main rods. According to the different lengths of the wall supporting members, the lengths of the main rods and the number of the diagonal rods arranged are different.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and particularly relates to an observation device for a bridge main tower and an installation method thereof. Background Art

[0002] With the development of modern bridge construction technology, double-tower double-cable-plane steel-concrete composite girder cable-stayed bridges that can provide longer spans, with beautiful shapes and durability, have been widely used. With the development of the multi-functional application of bridges, people require modern bridges to not only meet the traffic function but also provide the function of observing the external scenery similar to high-rise buildings, which requires the combination of an observation elevator and a bridge. The hoistway of such an observation elevator can only be installed in cooperation with the main tower of the bridge. However, there are generally two bridge pylons (i.e., main towers). After the construction of the pylons is completed, key structures such as the bridge deck and stay cables need to be constructed immediately, leaving no dedicated time for the installation of the elevator hoistway. Moreover, due to the different weights on both sides of the bridge cantilever, the pylon will deflect slightly towards the side span. After actual measurement, the maximum deflection can reach about 20 cm. Therefore, to ensure the verticality of the elevator hoistway, the elevator hoistway can only be installed after the bridge is closed and the pylon is determined to be vertical. The elevator hoistway is located below the bridge deck and cannot be directly hoisted in place by a tower crane. Generally, the working space under the bridge is limited, especially for bridges in canyons or river channels. It is difficult to carry out the installation construction while ensuring the verticality and stiffness of the elevator. Summary of the Invention

[0003] The invention provides an observation device for a bridge main tower and an installation method thereof, mainly including an observation elevator. For an irregularly shaped bridge main tower, such as a hollow diamond-shaped pylon, since the elevator hoistway is installed vertically along the main tower, the distance between the hoistway and the main tower changes with the change of the main tower shape. At the same time, both the bridge main body and the main tower are already completed, especially for bridges in canyon mountain streams. The elevator hoistway is equivalent to construction in a narrow space, and it is inconvenient to use a tower crane, with great difficulty.

[0004] To solve the above problems, the hoistway of the observation elevator of the invention is installed in sections on one side or multiple sides of the bridge main tower. The last section at the bottom of the hoistway is pre-embedded in the pylon pedestal. The hoistway itself is fixed by a horizontal ring beam, and the side of the hoistway is fixedly connected to the main tower through a wall support member with a variable length, ensuring the stiffness and verticality of the hoistway. The installation method is to set two winches on the bridge deck corresponding to the main tower. One winch is responsible for first lifting the sectional hoistway upward. When it is lifted to the installation position of the sectional hoistway, the two winches cooperate to lift the sectional hoistway to a horizontal state and then connect and fix the two sectional hoistways downward, avoiding the use of a tower crane.

[0005] In a first aspect, the sightseeing device for the main tower of a bridge includes a sightseeing elevator. The sightseeing elevator includes a number of sectional shafts and a number of pairs of wall - supporting members. Each pair of wall - supporting members is at the same horizontal height and is respectively arranged on both sides of the sectional shaft. The sectional shaft includes six columns and a ring beam at the top of the columns. One column is respectively arranged at each of the four top corners of the sectional shaft, and one column is respectively arranged in the middle of two parallel side faces of the sectional shaft facing the main tower. The ring beam is horizontally arranged and sequentially connects the six columns.

[0006] The corresponding columns of a number of sectional shafts are vertically connected up and down to form a vertical shaft. The elevator is installed in the shaft, and the columns of the sectional shaft at the bottom of the shaft are embedded in the tower base of the main tower.

[0007] One end of the wall - supporting member is connected to the column of the corresponding sectional shaft, and the other end is connected to the corresponding side face of the main tower. The wall - supporting member includes two main rods arranged parallel to each other up and down and a number of diagonal rods connected between the main rods. According to the different lengths of the wall - supporting members, the lengths of the main rods and the number of diagonal rods arranged are different.

[0008] Optionally, the sectional shaft is a cuboid. Two opposite long side faces of the sectional shaft face the side face of the main tower, and two wide side faces are perpendicular to the side face of the main tower. One column is respectively arranged at each of the four top corners of the cuboid, and one column is respectively arranged in the middle of the two long side faces. All six columns are vertically arranged.

[0009] The ring beam is rectangular, including six ring beam rods. The two ends of the ring beam rods are respectively fixedly connected to the adjacent columns. The ring beam rods are all horizontal and at the same horizontal height.

[0010] Optionally, the last - section sectional shaft at the bottom of the shaft is the bottom - section sectional shaft. The ratio of the height of the bottom - section sectional shaft to the height of the other upper - section sectional shafts is (1.1 - 1.5):1, and the height of the other upper - section sectional shafts is 2.5 - 3.5 meters.

[0011] The lower part of the columns of the bottom - section sectional shaft is embedded in the tower base of the main tower. When the tower base is poured, the area within the range of the six columns of the bottom - section sectional shaft is reserved without pouring for placing the elevator. The embedding depth is 1 / 3 - 1 / 2 of the height of the bottom - section sectional shaft.

[0012] Further optionally, the bottom ends of the columns of the bottom - section sectional shaft are connected by high - strength bolts to an even number of tension rods, such as 2 - 4 tension rods. The tension rods are vertically arranged and penetrate from the tower base to the inside of the lower bearing platform, firmly connecting the elevator shaft to the tower base and the bearing platform. The tension rods are arranged in the middle of the cross - section of the column.

[0013] Further optionally, the part of the columns of the bottom - section sectional shaft embedded in the tower base is provided with a number of stud welds from top to bottom, and they are arranged in layers. 12 - 16 stud welds are welded in each layer, and they are evenly arranged along the circumferential direction of the column, with a total of 6 - 8 layers.

[0014] The stud is a cylinder head stud. One end of the cylinder head extends into the tower base, and the other end is welded inside the column, which helps to increase the contact area between the foundation at the bottom of the shaft and the tower base and improve the stability of the shaft.

[0015] Optionally, the top end of the diagonal bar of the wall support is fixedly connected to the upper main bar, and the bottom end is fixedly connected to the lower main bar. The inclination angle is 45°. A number of diagonal bars are connected end to end and are evenly arranged in an N shape along the length direction of the main bar.

[0016] Optionally, a horizontal viewing platform is provided at the junction of the columnar part and the rhombic part of the main tower. The shaft and the inspection staircase penetrate through the viewing platform and extend below the bridge deck. The viewing platform is circular, and the steel frame of the viewing platform is fixedly connected to each side of the main tower.

[0017] Optionally, the sightseeing device for the bridge main tower further includes a sightseeing staircase and a curtain wall. The sightseeing elevator is arranged on one side of the main tower, and the sightseeing staircase is arranged along the other three sides. The sightseeing staircase is divided into several sections. Each section of the sightseeing staircase is inclined and arranged on one side of the main tower, and is evenly arranged on the three sides in a head-to-tail connection form;

[0018] When the sightseeing staircase climbs along the three sides of the main tower in the clockwise or counterclockwise direction, it then starts to turn back from the last side and continues to climb along the three sides of the main tower in the counterclockwise or clockwise direction;

[0019] A partition handrail is arranged in the middle of each section of the sightseeing staircase. The partition handrail is parallel to the corresponding sightseeing staircase and is used to separate the ascending and descending personnel;

[0020] Curtain walls are arranged on the outer sides of the three sides of the main tower without sightseeing elevators. The curtain wall includes a steel frame and toughened glass to protect the sightseeing staircase and the personnel on the staircase.

[0021] Further optionally, a horizontal viewing platform is provided at the top of every three connected sections of the sightseeing staircase. The viewing platform winds around the three sides where the sightseeing staircase is arranged. The inner side of the viewing platform is fixedly connected to the side of the main tower, and the outer side is fixedly connected to the inner side of the curtain wall;

[0022] The structure of the viewing platform can be a steel frame covered with toughened glass or a steel frame formed by pouring concrete.

[0023] Further optionally, the curtain wall is provided with a number of horizontal ventilation windows for ventilating and exchanging the internal environment of the curtain wall; each ventilation window corresponds to a viewing platform, and the ventilation window is arranged 2.5 - 3.5 meters above the viewing platform, which is convenient for the staff to open and close the ventilation window with the help of a ladder, and at the same time avoids tourists contacting the ventilation window;

[0024] One side of the main tower corresponds to a curtain wall, and a ventilation window runs through the curtain wall along the width direction of the corresponding curtain wall. Since the steel structure framework of the curtain wall is evenly arranged, a ventilation window will be divided into several parts by several vertical steel structures.

[0025] In a second aspect, the installation method of the sightseeing device for the bridge main tower includes the following steps:

[0026] S1: On the bridge deck corresponding to the main tower, there are two sets of winch hoisting components. The two sets of winch hoisting components are respectively arranged on the outer sides of the length direction of the elevator shaft. The winch hoisting component includes a winch and a guide wheel bracket. The positions of the winch and the guide wheel bracket correspond to the two sides of the main tower in the width direction of the shaft respectively, and the guide wheel bracket is close to the side of the main tower where the shaft is installed.

[0027] S2: The ropes of the first winch and the second winch are respectively connected to the ring beams at both ends of the sectional shaft. The first winch vertically lifts the sectional shaft above the position where the sectional shaft is to be installed, and at the same time, the second winch winds its own rope in coordination with the change in the height of the sectional shaft, but does not apply force.

[0028] S3: The rope of the second winch is wound, and at the same time, the rope winding speed of the first winch is less than that of the second winch, so that the sectional shaft gradually changes from a vertical state to a horizontal state while rising.

[0029] S4: The ropes of the first winch and the second winch are synchronously unwound, and the sectional shaft is horizontally lowered to the installation position, and then welded to the top of the column of the lower sectional shaft.

[0030] S5: Install the elevator inside the shaft.

[0031] Optionally, in step S1, setting the winch specifically includes the following steps:

[0032] (1) Openings are respectively provided at the four top corners of each winch. Steel plates are pre-embedded in the bridge deck at the bottom of the winch, and the four top corners are fixed to the pre-embedded steel plates through mechanical connections to make the winch horizontal.

[0033] (2) The guide wheel bracket includes a cross beam, a load-bearing beam and two support columns from top to bottom. The load-bearing beam is parallel to the width direction of the shaft. Both ends of the load-bearing beam are respectively fixedly connected to a support column. The support columns are vertical and the bottom is connected to the bridge deck. The cross beam is sleeved outside the load-bearing beam. One side of the bottom of the cross beam is connected to the guide wheel, and the guide wheel is above the bridge deck, and the other side is connected to a movable pulley below the bridge deck.

[0034] Penetration holes are respectively opened on the bridge deck below the guide wheel and above the movable pulley for the rope of the winch to be lowered and lifted.

[0035] (3) The rope of the winch extends horizontally and is connected to the corresponding guide pulley, then passes through the through hole below the guide pulley and exits below the bridge deck, and then is connected to the corresponding movable pulley. After passing through the movable pulley, it passes upward through another through hole in the bridge deck and is fixedly connected to the corresponding cross beam. Description of the Drawings

[0036] Figure 1 It is a schematic structural diagram of the main tower of the bridge and the elevator shaft;

[0037] Figure 2 It is a schematic diagram of the long side of the sectional shaft;

[0038] Figure 3 It is a schematic diagram of the wall support;

[0039] Figure 4 It is a schematic diagram of the bottom sectional shaft buried in the tower base;

[0040] Figure 5 It is a schematic diagram of the tie rod and stud of the column of the bottom sectional shaft;

[0041] Figure 6 It is a top view schematic diagram of the installation of two winch hoisting components on the bridge deck;

[0042] Figure 7 It is a side view schematic diagram of the installation of two winch hoisting components on the bridge deck;

[0043] Figure 8 It is a schematic structural diagram of the guide pulley bracket;

[0044] Figure 9 It is a schematic diagram of the installation of the sectional shaft (one);

[0045] Figure 10 It is a schematic diagram of the installation of the sectional shaft (two);

[0046] Figure 11 It is a schematic diagram of the installation of the sectional shaft (three);

[0047] Figure 12 It is a schematic structural diagram of the sightseeing staircase and viewing platform of the main tower (one);

[0048] Figure 13 It is a schematic structural diagram of the sightseeing staircase and viewing platform of the main tower (two);

[0049] Figure 14 It is a schematic diagram of the curtain wall and ventilation window;

[0050] Figure 15 It is a schematic structural diagram of the cleaning device;

[0051] Figure 16 It is a schematic diagram of the cooperation of the rotating wheel, the lifting rope and the limit ball;

[0052] Figure 17 It is a schematic diagram of the inner traveling mechanism.

[0053] In the attached drawings, 1 - segmented shaft, 2 - wall support, 3 - column, 4 - ring beam, 5 - tower base, 6 - main tower, 7 - main rod, 8 - diagonal rod, 9 - shaft diagonal rod, 10 - bottom segmented shaft, 11 - tie rod, 12 - stud, 13 - pile cap, 14 - viewing platform, 15 - sightseeing staircase, 16 - curtain wall, 17 - driving motor, 18 - viewing deck, 19 - ventilation window, 20 - support column, 21 - inner wiping plate, 22 - outer wiping plate, 23 - rotating shaft, 24 - rotating wheel, 25 - lifting rope, 26 - protective cover, 27 - through hole, 28 - through hole plate, 29 - limit ball, 30 - inner plate support, 31 - inner wiping pad, 32 - magnetic track, 33 - inner traveling mechanism, 34 - guide wheel, 35 - first housing, 36 - first winch, 37 - second winch, 38 - guide wheel bracket, 39 - cross beam, 40 - load-bearing beam. Specific implementation mode

[0054] This embodiment provides a sightseeing device for the main tower of a bridge, as Figures 1-8 shown, including a sightseeing elevator. The sightseeing elevator includes a number of segmented shafts 1 and a number of pairs of wall supports 2. Each pair of wall supports 2 is at the same horizontal height and is respectively arranged on both sides of the segmented shaft 1; The segmented shaft 1 includes six columns 3 and a ring beam 4 at the top of the column 3. One column 3 is respectively arranged at the four top corners of the segmented shaft 1, and one column 3 is respectively arranged in the middle of the two parallel side faces of the segmented shaft 1 facing the main tower 6. The ring beam 4 is horizontally arranged and sequentially connects the six columns 3;

[0055] The corresponding columns 3 of a number of segmented shafts 1 are connected up and down to form a vertical shaft. The elevator is installed in the shaft, and the columns 3 of the segmented shaft 1 at the bottom of the shaft are embedded in the tower base 5 of the main tower 6;

[0056] One end of the wall support 2 is connected to the corresponding column 3 of the segmented shaft 1, and the other end is connected to the side face of the corresponding main tower 6. The wall support 2 includes two main rods 7 arranged parallel up and down and a number of diagonal rods 8 connected between the main rods 7. According to the different lengths of the wall support 2, the lengths of the main rods 7 and the number of diagonal rods 8 arranged are different.

[0057] Optionally, the segmented shaft 1 is a cuboid. The two opposite long side faces of the segmented shaft 1 face the side face of the main tower 6, and the two wide side faces are perpendicular to the side face of the main tower 6. One column 3 is respectively arranged at the four top corners of the cuboid, and one column 3 is respectively arranged in the middle of the two long side faces. The six columns 3 are all vertically arranged;

[0058] The ring beam 4 is rectangular and includes six ring beams 4, both ends of which are fixedly connected to adjacent columns 3, and the ring beams 4 are all horizontal and at the same level. The columns 3 are square steel pipe columns.

[0059] Further optionally, a shaft diagonal rod 9 is provided on both the long side and the wide side, one end of the shaft diagonal rod 9 is fixedly connected to the top of a column 3, and the other end is fixedly connected to the bottom of an adjacent column 3, so as to improve the rigidity of the segmented shaft 1.

[0060] The segmented shaft 1 of the present invention adopts a rectangular parallelepiped shape with high strength and stability. The segmented shaft 1 is evenly divided into two parts by two columns 3 in the middle of the long side, and can accommodate two sightseeing elevators. Several segmented shafts 1 are connected up and down to form an integral elevator shaft, which is convenient for installation and maintenance. The ring beam 4 connects the six columns 3 in the horizontal direction, thereby improving the rigidity of the segmented shaft 1.

[0061] Optionally, the last segmented shaft 1 at the bottom of the shaft is the bottom segmented shaft 10, the ratio of the height of the bottom segmented shaft 10 to the height of the other segmented shafts 1 at the top is (1.1-1.5):1, and the height of the other segmented shafts 1 at the top is 2.5-3.5 meters;

[0062] The lower part of the column 3 of the bottom segmented shaft 10 is pre-buried in the tower base 5 of the main tower 6, and when the tower base 5 is cast, the six columns 3 of the bottom segmented shaft 10 are reserved and not cast for placing the elevator. The pre-buried depth is 1 / 3-1 / 2 of the height of the bottom segmented shaft 10.

[0063] Further optionally, the bottom end of the column 3 of the bottom section shaft 10 is connected to an even number of tie rods 11, for example 2-4 tie rods 11, by high-strength bolts. The tie rods 11 are vertically arranged and pass through the tower base 5 to the interior of the pedestal 13 below, thereby firmly connecting the elevator shaft with the tower base 5 and the pedestal 13; the tie rods 11 are arranged in the middle of the cross section of the column 3.

[0064] Further optionally, the part of the column 3 of the bottom segmented shaft 10 pre-buried in the tower base 5 is provided with a plurality of welding nails 12 from top to bottom, and is arranged in layers, with 12-16 welding nails 12 welded in each layer, and evenly arranged along the circumference of the column 3, with a total of 6-8 layers;

[0065] The welding nail 12 is a cylindrical head welding nail, one end of the cylindrical head extends into the tower base 5, and the other end is welded in the column 3, which helps to increase the contact area between the bottom foundation of the well and the tower base 5 and improve the stability of the well.

[0066] Optionally, there are at least 4 sectional hoistways 1 between two adjacent wall-supports 2 up and down, which can not only ensure the stiffness and stability of the overall elevator hoistway, but also save the wall-supports 2. The top end of the diagonal rod 8 of the wall-support 2 is fixedly connected to the upper main rod 7, and the bottom end is fixedly connected to the lower main rod 7, with an inclination angle of 45°. A number of diagonal rods 8 are connected end to end and are evenly arranged in an N shape along the length direction of the main rod 7.

[0067] Since the main tower 6 of the hollow diamond-shaped pylon is divided into a lower columnar part and an upper diamond part, when the elevator hoistway is connected to the columnar part of the main tower 6, the distance between the two is fixed. The size, the number of diagonal rods 8 and the inclination angle of the main rod 7 of the wall-support 2 in the columnar part of the main tower 6 are fixed and consistent. One end of the wall-support 2 is connected to the embedded steel plate on the corresponding side of the main tower 6. When the elevator hoistway is connected to the diamond part of the main tower 6, the distance between the two is constantly changing. The size, the number of diagonal rods 8 and the inclination angle of the main rod 7 of the wall-support 2 in the diamond part of the main tower 6 also change accordingly. That is, the size, the number of diagonal rods 8 and the inclination angle of the wall-support 2 at different heights should be specifically set according to the distance between the hoistway and the main tower 6 at the corresponding position. The greater the distance, the longer the main rod 7 of the wall-support 2 and the more diagonal rods 8 are set.

[0068] Optionally, there is a maintenance staircase between the hoistway and the main tower 6. The maintenance staircase is a conventional "zigzag" type. The frame of the maintenance staircase is several secondary wall-supports. One end of the secondary wall-support is fixedly connected to the columns 3 at both ends of the long side of the corresponding sectional hoistway 1 close to the main tower 6, and the other end is fixedly connected to the embedded steel plate on the corresponding side of the main tower 6.

[0069] The secondary wall-support includes two secondary rods arranged parallel up and down and a secondary diagonal rod connected between the secondary rods. The two secondary rods, the column 3 of the sectional hoistway 1 and the side of the main tower 6 form a square, and the secondary diagonal rod is the diagonal of the square.

[0070] The top end of a section of the maintenance staircase and the bottom end of the adjacent maintenance staircase are jointly fixedly connected to the lower secondary rod of the corresponding secondary wall-support, so that the secondary wall-support as a whole functions as the railing of the maintenance staircase.

[0071] For the maintenance staircase of the diamond part at the upper part of the main tower, one side is connected to the sectional hoistway 1, and the other side extends and is connected to the embedded steel plate on the side of the diamond part of the main tower.

[0072] Optionally, the sightseeing elevator is installed inside the hoistway. Double-layer tempered glass is provided on the four sides of the elevator for passengers to view the scenery outside. The main lifting equipment is arranged on the side of the elevator facing the maintenance staircase, which not only makes full use of the space, but also facilitates the staff to maintain the elevator through the maintenance staircase. Other configurations of the sightseeing elevator can adopt conventional sightseeing elevators.

[0073] Optionally, a horizontal viewing platform 14 is provided at the junction of the columnar part and the diamond part of the main tower 6, the shaft and the inspection steps run through the viewing platform 14 and extend to the bottom of the bridge deck, the viewing platform 14 is circular, the steel frame of the viewing platform 14 is fixedly connected to each side of the main tower 6, and the other structures of the viewing platform 14 can adopt the conventional viewing platform 14 structure in the construction field. Visitors can take the sightseeing elevator at the bottom of the main tower 6 to reach the viewing platform 14, enjoy the scenery under the bridge, then take the sightseeing elevator to the bottom of the bridge deck, and finally reach the bridge deck through a short section of inspection steps.

[0074] When the sightseeing elevator of the present invention is installed on one side of the main tower 6, and the other three sides are vacant, the counterweight on one side of the main tower 6 will be too large, and the force on the main tower 6 will be unbalanced. If the bridge is built in a mountainous area or a canyon, the main tower 6 will also be subjected to a large wind force, which further increases the burden on the main tower 6 and puts a severe test on the tower base 5 and the pedestal. If the sightseeing elevator is installed on all four sides of the main tower 6, it may cause a waste of elevator resources and a high cost for the later maintenance of the elevator.

[0075] like Figures 12-17 As shown, optionally, the sightseeing device for the main tower of the bridge further includes a sightseeing staircase 15 and a curtain wall 16, the sightseeing elevator is arranged on one side of the main tower 6, the sightseeing staircase 15 is arranged along the other three sides, the sightseeing staircase 15 is divided into several sections, each section of the sightseeing staircase 15 is inclinedly arranged on one side of the main tower 6, and is evenly arranged on the three sides in the form of end-to-end connection;

[0076] After the sightseeing staircase 15 climbs over three sides of the main tower 6 in a clockwise or counterclockwise direction, it turns back from the last side and continues to climb over three sides of the main tower 6 in a counterclockwise or clockwise direction;

[0077] A separating handrail is provided in the middle of each sightseeing staircase 15, and the separating handrail is parallel to the corresponding sightseeing staircase 15, and is used to separate the people going up and down;

[0078] The outer sides of the three sides of the main tower 6 where no sightseeing elevator is arranged are all provided with curtain walls 16, and the curtain walls 16 include a steel frame and tempered glass for protecting the sightseeing steps 15 and the people on the steps.

[0079] Further optionally, a horizontal viewing platform 18 is provided at the top of each of the three connected sightseeing steps 15, and the viewing platform 18 is arranged around the three sides of the sightseeing steps 15, and the inner side of the viewing platform 18 is fixedly connected to the side of the main tower 6, and the outer side is fixedly connected to the inner side of the curtain wall 16;

[0080] The structure of the viewing platform 18 can be a steel frame with tempered glass laid on it, or a steel frame with concrete poured into it.

[0081] An observation elevator is installed on one side of the main tower 6, and observation stairways 15, observation decks 18 and curtain walls 16 are installed on the other three sides, achieving a relatively balanced counterweight to relieve the uneven stress on each side of the main tower 6 as much as possible. In addition, the observation stairways 15 can provide visitors with a unique way of viewing and viewing experience. The stairways are divided into up and down lanes to facilitate visitors to go up and down the stairways and maintain order. Every three sections of the observation stairways 15 form a group, and then the upward observation stairways 15 will continue to climb in the opposite direction. Observation decks 18 are arranged between two adjacent groups of stairways up and down to facilitate visitors to rest and view the scenery and experience the scenery at different heights. Moreover, the observation decks 18 and curtain walls 16 can also serve as reinforcement structures on the outside of the main tower 6 to provide additional support for the main tower 6 and improve the stiffness and strength of the main tower 6. The observation stairways 15, observation decks 18 and curtain walls 16 can extend along the main tower 6 to the lower part of the observation platform 14 and connect with the observation platform 14, enabling visitors to reach the observation platform 14 from the observation stairways 15.

[0082] Further optionally, the curtain wall 16 is provided with a plurality of horizontal ventilation windows 19 for ventilating and exchanging air in the internal environment of the curtain wall 16; each ventilation window 19 corresponds to an observation deck 18, and the ventilation window 19 is arranged 2.5 - 3.5 meters above the observation deck 18, facilitating the staff to open and close the ventilation window 19 with the help of a ladder while preventing tourists from contacting the ventilation window 19;

[0083] One side of the main tower 6 corresponds to one curtain wall 16, and a ventilation window 19 runs through the curtain wall 16 along the width direction of the corresponding curtain wall 16. Since the steel structure frames of the curtain wall 16 are evenly arranged, a ventilation window 19 will be divided into several parts by several vertical steel structures.

[0084] The glass curtain wall 16 of the main tower 6 needs to be cleaned regularly. In the city, the main way to clean buildings with glass curtain walls 16 is to clean them manually with the help of suspension ropes 25, which is relatively dangerous. For bridges in valleys and canyons, the strong wind makes manual cleaning even more dangerous and ineffective.

[0085] The present invention also provides a cleaning device applicable to the curtain wall 16. Optionally, the cleaning device includes a main beam, an inner wiping board 21 and an outer wiping board 22. A rotating shaft 23 is provided at the center inside the main beam, and a plurality of rotating wheels 24 are evenly arranged on the rotating shaft 23. A driving motor 17 is arranged at one end of the main beam and connected to the rotating shaft 23; the main beam, the rotating shaft 23, the inner wiping board 21 and the outer wiping board 22 are all horizontally arranged;

[0086] The inner wiping board 21 and the outer wiping board 22 are connected by a number of suspension ropes 25. One suspension rope 25 is correspondingly connected to one rotating wheel 24. The rotating wheel 24 drives the movement of the suspension rope 25, thereby driving the inner wiping board 21 and the outer wiping board 22 to move in opposite directions to scrub the curtain wall glass. Since there are multiple steel structure barriers within a ventilation passage range, one such cleaning device is provided between two adjacent steel structures.

[0087] Optionally, a protective cover 26 is provided outside the main beam to protect the internal rotating shaft 23 and rotating wheel 24. A clamping component is provided at the bottom of the main beam for detachably mounting the main beam on the window frame of the ventilation window 19. The clamping component uses a conventional clamping component, such as a clamping component with two sides, and the window frame is clamped between the two sides.

[0088] Optionally, the center of the rotating wheel 24 is fixedly connected to the rotating shaft 23 and can rotate with the rotating shaft 23; a number of openable and closable through holes 27 are provided on the outer side of the rotating wheel 24. The through holes 27 are evenly arranged along the circumference of the rotating wheel 24, and the opening surface of the through hole 27 faces the rotating direction of the rotating wheel 24; the suspension rope 25 can sequentially pass through each through hole 27 of the corresponding rotating wheel 24.

[0089] Further optionally, the through hole 27 of the rotating wheel 24 is formed by splicing two symmetrically arranged through hole plates 28. The bottom of the through hole plate 28 is close to one side of the center of the rotating wheel 24, and the top of the through hole plate 28 is the outer edge of the rotating wheel 24; the bottoms of the two through hole plates 28 are hinged, and a switch is provided at the top;

[0090] When the tops of the two through hole plates 28 are butted and the switch is closed, the through hole 27 is formed; when the switch is opened and the tops of the two through hole plates 28 are separated from each other, the through hole 27 is in an open state.

[0091] Further optionally, a number of pairs of limiting ball groups are evenly arranged at intervals on the suspension rope 25. Each pair of limiting ball groups includes two limiting balls 29. The distance between the two limiting balls 29 in the same limiting ball group is slightly larger than the width of the through hole plate 28, so that the two limiting balls 29 can be on both sides of the same pair of through hole plates 28. The outer diameter of the limiting ball 29 is larger than the diameter of the through hole 27. After the two through hole plates 28 are closed to form the through hole 27, the adjacent limiting balls 29 cannot pass through the through hole 27;

[0092] The distance between two adjacent limiting balls 29 in different limiting ball groups is slightly smaller than the distance between two adjacent through holes 27, so that one pair of limiting ball groups corresponds to one through hole 27.

[0093] The drive motor 17 can drive the rotating shaft 23 to rotate bidirectionally. When the rotating shaft 23 rotates towards the inner wiping plate 21, it drives the rotating wheel 24 to rotate towards the inner wiping plate 21 as well. When the through-hole plate 28 on the side close to the outer wiping plate 22 rotates past the middle of the rotating wheel 24 and starts to rise, a pair of through-hole plates 28 closes to form a through-hole 27. The lifting rope 25 is incorporated into the through-hole 27, and the two limiting balls 29 of a corresponding set of limiting ball groups are respectively stuck on both sides of the through-hole 27. Since the limiting ball 29 cannot pass through the through-hole 27, the position of the lifting rope 25 here is fixed in this way, enabling the rotating wheel 24 to drive the lifting rope 25 to move towards the inner wiping plate 21. This pair of through-hole plates 28 remains closed and rotates with the rotating wheel 24 until it rotates to the middle of the rotating wheel 24 on the side close to the inner wiping plate 21, at which time this pair of through-hole plates 28 opens (the through-hole 27 opens). As the rotating wheel 24 rotates, the lifting rope 25 disengages from the through-hole 27 through the openings of the two through-hole plates 28 and extends downward towards the inner wiping plate 21, causing the outer wiping plate 22 to move upward and the inner wiping plate 21 to move downward simultaneously; and this pair of through-hole plates 28 remains open and rotates. When it rotates to the side close to the outer wiping plate 22 again and reaches the middle of the rotating wheel 24, the above operation is repeated.

[0094] Reversing the above operation can achieve the downward movement of the outer wiping plate 22 and the upward movement of the inner wiping plate 21 simultaneously.

[0095] In the present invention, the openable and closable through-hole 27 on the rotating wheel 24 cooperates with a corresponding number of sets of limiting ball groups to achieve the bidirectional pulling of the lifting rope 25, thereby realizing the up-and-down movement of the inner wiping plate 21 and the outer wiping plate 22, enabling the inner wiping plate 21 and the outer wiping plate 22 to perform the action of scrubbing the glass up and down.

[0096] Optionally, the inner wiping plate 21 includes an inner plate support 30, an inner wiping pad 31, and at least one inner traveling mechanism 33. The inner plate support 30 is rectangular, the length direction of the inner plate support 30 is horizontal, and a detachable inner wiping pad 31 is provided on the side of the inner plate support 30 facing the curtain wall 16 for cleaning the inner side of the curtain wall 16.

[0097] The inner traveling mechanism 33 is provided at one end of the inner plate support 30 and is connected to the vertical curtain wall steel structure on one side of the inner wiping plate 21.

[0098] Further optionally, the inner traveling mechanism 33 includes an inner motor and a magnetic crawler 32. The inner motor is provided in the first housing 35, and a magnetic crawler 32 is provided on the side of the first housing 35 facing the curtain wall steel structure. The magnetic crawler 32 is made of a permanent magnet and can adsorb on the steel structure, enabling the inner wiping plate 21 to closely adhere to the curtain wall glass for scrubbing; the inner motor is connected to and drives the two magnetic crawlers 32 to travel up and down along the steel structure.

[0099] The structure of the outer wiping board 22 is the same as that of the inner wiping board 21. The outer wiping board 22 includes an outer board support, an outer wiping pad, and at least one outer traveling mechanism. The outer board support is rectangular, and the length direction of the outer board support is the horizontal direction. A detachable outer wiping pad is provided on the side of the outer board support facing the curtain wall 16 for cleaning the outer side of the curtain wall 16.

[0100] The outer traveling mechanism is provided at one end of the outer board support and is connected to the vertical curtain wall steel structure on one side of the outer wiping board 22.

[0101] Further optionally, the outer traveling mechanism includes an outer motor and a magnetic track. The outer motor is provided outside the second housing, and a magnetic track is provided on the side of the second housing facing the curtain wall steel structure. The magnetic track is made of a permanent magnet and can adsorb on the steel structure, so that the outer wiping board 22 can closely adhere to the curtain wall glass for scrubbing. The outer motor is connected to and drives the magnetic track to move up and down along the steel structure.

[0102] In a general suspension structure, the suspension object at the bottom is in a natural hanging state. Without external force, the suspension object will not automatically approach any side. Just like the outer wiping board 22 and the inner wiping board 21 of the present invention, the two wiping boards are alternately moved up and down through the suspension ropes 25, and then the outer traveling mechanism and the inner traveling mechanism 33 are combined to lead the outer wiping board 22 and the inner wiping board 21 to closely adhere to both sides of the curtain wall glass to achieve the scrubbing purpose. Moreover, the traveling mechanism enables one end or both ends of the board support to move along the vertical steel structure, assisting the rotating wheel 24 and the suspension ropes 25 to better control the moving track of the wiping board not to deviate from the vertical line and avoid collision or entanglement with adjacent cleaning devices. The length of the suspension ropes 25 of the cleaning device refers to the spacing of the adjacent ventilation windows 19, so that the cleaning device can scrub the curtain wall glass between two adjacent upper and lower ventilation windows 19.

[0103] After the cleaning is completed, the main beam can be removed and the ventilation window 19 can be closed.

[0104] The installation method of the sightseeing device for the bridge main tower, as Figures 9-11 shown, includes the following steps:

[0105] S1: Two sets of winch hoisting components are provided on the bridge deck corresponding to the main tower 6. The two sets of winch hoisting components are respectively arranged outside the length direction of the elevator shaft. The winch hoisting component includes a winch and a guide wheel bracket 38. The positions of the winch and the guide wheel bracket 38 correspond to both sides of the main tower 6 in the width direction of the shaft, and the guide wheel bracket 38 is close to the side of the main tower 6 where the shaft is installed.

[0106] S2: The ropes of the first winch 36 and the second winch 37 are respectively connected to the ring beams 4 at both ends of the sectional shaft 1. The first winch 36 vertically lifts the sectional shaft 1 above the position where the sectional shaft 1 is to be installed, and at the same time, the second winch 37 winds its own rope in cooperation with the change in the height of the sectional shaft 1 but does not apply force.

[0107] S3: The rope of the second hoist 37 is wound up, and at the same time, the rope winding speed of the first hoist 36 is less than that of the second hoist 37, so that the segmented shaft 1 gradually flattens from the vertical state to the horizontal state while rising.

[0108] S4: The ropes of the first hoist 36 and the second hoist 37 are unwound synchronously, and the segmented shaft is horizontally lowered to the installation position to be installed, and then welded to the top of the column of the lower segmented shaft.

[0109] S5: Install the elevator inside the shaft.

[0110] Before step S1 (i.e., during the construction of the main tower 6 of the bridge), it also includes embedding the columns of the bottom segmented shaft 10 and their stud welds 12 in the tower base 5 of the main tower, and embedding the corresponding tie rods 11 of the columns in the pile cap and the tower base 5, and no pouring is carried out within the range of the six columns of the bottom segmented shaft 10.

[0111] In step S1, setting up the hoist specifically includes the following steps:

[0112] (1) Openings are provided at the four top corners of each hoist. Steel plates are pre-embedded in the bottom bridge deck of the hoist, and the four top corners are fixed to the pre-embedded steel plates by mechanical connection to make the hoist horizontal.

[0113] (2) The guide wheel bracket 38 includes a cross beam 39, a load-bearing beam 40 and two support columns 20 from top to bottom. The load-bearing beam 40 is parallel to the width direction of the shaft. One support column 20 is fixedly connected to each end of the load-bearing beam 40. The support columns 20 are vertical and their bottoms are connected to the bridge deck. The cross beam 39 is sleeved outside the load-bearing beam 40. One side of the bottom of the cross beam 39 is connected to the guide wheel 34, and the guide wheel 34 is above the bridge deck, and the other side is connected to the movable pulley below the bridge deck.

[0114] Through holes are respectively opened on the bridge deck below the guide wheel 34 and on the bridge deck above the movable pulley for the rope of the hoist to be lowered and lifted.

[0115] (3) The rope of the hoist extends horizontally and is connected to the corresponding guide wheel 34, then passes through the through hole below the guide wheel 34 and penetrates out below the bridge deck, and then is connected to the corresponding movable pulley. After passing through the movable pulley, it passes upward through the other through hole on the bridge deck and is fixedly connected to the corresponding cross beam 39.

[0116] In step (1), the openings at the four top corners of the hoist are anchored with φ25mm steel bars as the anchor points, and the holes are filled with cement slurry. The top of the steel bars is welded to the bottom frame of the hoist through a 10mm thick steel plate.

[0117] Optionally, in step (2), the cross beam 39, the load-bearing beam 40 and the support columns 20 are all made of double-channel 22b steel. A 6-mm thick steel plate is used as a splicing plate to connect the double-channel steels. The weld height between the splicing plate and the double-channel steels is not less than 6 mm. Full welding is used between the load-bearing beam 40 and the support columns 20, and between the load-bearing beam 40 and the cross beam 39, and the weld height is not less than 10 mm.

[0118] One side of the cross beam 39 is connected to the guide wheel 34 through a lifting lug. The lifting lug is processed from a 20-mm thick steel plate. The lifting lug and the cross beam 39 are welded by double-sided full welding, and the weld height is not less than 14 mm.

[0119] A through hole is provided below the guide wheel 34, and a through hole is provided below the other side of the cross beam 39, which are respectively used for the ropes of the corresponding winches to pass through the bridge deck downward and upward. Both through holes are reserved during the construction of the bridge deck. After the elevator shaft is installed, the through holes are filled with concrete.

[0120] In step (3), the ropes of the winch are wound in a double-wheel form, bypass the guide wheel 34 and extend below the bridge deck, then bypass the movable pulley, extend and return above the bridge deck, and finally are fixedly tied to the guide wheel bracket 38. Through the use of the guide wheel 34 and the movable pulley, the weight that the winch can lift is increased. A hook is provided at the bottom of the movable pulley for hanging the sectional shaft 1, and the movable pulley moves with the retraction and release of the winch rope.

[0121] In step S2, first transport the sectional shaft to the construction site, and tie the ropes of the first winch 36 and the second winch 37 to the ring beams 4 at both ends of the sectional shaft in the length direction. In order to keep the sectional shaft stable, the movable pulley hook at the bottom of the rope of each winch is connected to two ropes, which are used to tie the two ends of the ring beam 4 respectively.

[0122] In step S3, for the installation of the shaft above the viewing platform 14, since the height is relatively high and the wind force is relatively large, in order to prevent the sectional shaft 1 from being blown and swayed during hoisting, the columns 3 of the sectional shaft 1 are tied with ropes (guy ropes). The staff controls the bottom end of the guy rope on the viewing platform 14 to assist in controlling the position of the sectional shaft 1 and prevent it from colliding with other already installed sectional shafts.

[0123] In steps S2 and S3, the ropes of the winch are steel wires. Appropriate steel wires can be selected according to the weight of the sectional shaft and the specifications of the guide wheel 34.

[0124] In step S4, the butt joint of the columns of two adjacent sectional hoistways up and down adopts the following method: Inside the top of each column 3 of the sectional hoistway 1, several limit pins are provided. The several limit pins are evenly distributed along the circumferential direction of the column 3 and have the same horizontal height. The outer diameter of the limit square steel pipe is slightly smaller than the inner diameter of the column 3. The bottom of the limit square steel pipe is inserted into the column of the lower sectional hoistway, and the bottom end abuts against the limit pins, thereby fixing the position of the limit square steel pipe. The column of the upper sectional hoistway to be installed is sleeved outside the corresponding limit square steel pipe from top to bottom, and the bottom end of the column abuts against the top end of the corresponding column of the lower installed sectional hoistway 1. It is equivalent that the lower part of the limit square steel pipe is inside the lower column, and the upper part of the limit square steel pipe is inside the upper column, playing a positioning role in the adjacent columns up and down, so that the adjacent sectional hoistways can be accurately positioned and firmly installed.

[0125] In step S4, after the sectional hoistway is installed through the limit square steel pipe, welding plates are welded at the interfaces of the upper and lower columns. The column has four sides, and one welding plate is welded on each side, and the welding plates on the two opposite sides are welded simultaneously. Finally, the joint between the upper and lower columns is subjected to a first-class weld (full penetration weld) to further ensure the stiffness and perpendicularity of the overall elevator hoistway.

[0126] For the installation of the wall support 2, secondary wall support and inspection escalator of the present invention, a winch can be used to hoist them to the position to be installed, and the construction workers can climb to the corresponding position on the suspended basket-type operation platform for installation and welding.

[0127] The sightseeing staircase 15, viewing platform 18 and curtain wall 16 of the present invention are located in the columnar part at the lower part of the main tower 6. Since the height is not high, it is not too close to the bridge deck, and there is no obstruction from the upper diamond part, so the sightseeing staircase 15, viewing platform 18 and curtain wall 16 can be installed using a tower crane according to the traditional construction method.

[0128] Similarly, the sectional hoistway 1, wall support 2, secondary wall support and inspection escalator in the columnar part at the lower part of the main tower 6 can be hoisted to a suitable height position by a tower crane, and then the construction workers can install and weld on the suspended basket-type operation platform.

Claims

1. A sightseeing device for a main tower of a bridge, characterized in that, It includes an observation elevator, and the observation elevator includes several segmented hoistways and several pairs of wall support members. Each pair of wall support members is at the same horizontal height and is respectively arranged on both sides of the segmented hoistway; The segmented hoistway includes six columns and a ring beam at the top of the columns. One column is respectively arranged at the four top corners of the segmented hoistway, and one column is respectively arranged in the middle of the two parallel side faces of the segmented hoistway facing the main tower. The ring beam is horizontally arranged and sequentially connects the six columns; The corresponding columns of several segmented hoistways are connected up and down to form a vertical hoistway. The elevator is installed in the hoistway, and the columns of the segmented hoistway at the bottom of the hoistway are embedded in the main tower pedestal; One end of the wall support member is connected to the column of the corresponding segmented hoistway, and the other end is connected to the corresponding side face of the main tower. The wall support member includes two main rods arranged parallel up and down and several diagonal rods connected between the main rods; The segmented hoistway is a cuboid. The two opposite long side faces of the segmented hoistway face the side face of the main tower, and the two wide side faces are perpendicular to the side face of the main tower. One column is respectively arranged at the four top corners of the cuboid, and one column is respectively arranged in the middle of the two long side faces. The six columns are all vertically arranged; The ring beam is rectangular, including six ring beam rods. The two ends of the ring beam rods are respectively fixedly connected to the adjacent columns. The ring beam rods are all horizontal and at the same horizontal height.

2. The sightseeing device for the main tower of a bridge according to claim 1, characterized in that, The last segmented hoistway at the bottom of the hoistway is the bottom segmented hoistway, and the ratio of the height of the bottom segmented hoistway to the height of the other upper segmented hoistways is (1.1 - 1.5):1; The lower parts of the columns of the bottom segmented hoistway are embedded in the main tower pedestal, and when the pedestal is poured, pouring is not carried out within the range of the six columns of the bottom segmented hoistway for placing the elevator.

3. The sightseeing device for a bridge main tower according to claim 2, characterized in that, The bottom ends of the columns of the bottom segmented hoistway are connected to an even number of tie rods. The tie rods are vertically arranged and penetrate through the pedestal to the inside of the lower bearing platform, firmly connecting the elevator hoistway with the pedestal and the bearing platform; The part of the column of the bottom segmented hoistway embedded in the pedestal is provided with several stud welds from top to bottom, and they are arranged in layers. 12 - 16 stud welds are welded in each layer and are evenly arranged along the circumference of the column, with a total of 6 - 8 layers; The stud weld is a cylinder head stud weld. One end of the cylinder head extends into the pedestal, and the other end is welded in the column, which helps to increase the contact area between the foundation at the bottom of the hoistway and the pedestal.

4. The sightseeing device for the main tower of a bridge according to claim 1, characterized in that The top ends of the diagonal rods of the wall support member are fixedly connected to the upper main rod, and the bottom ends are fixedly connected to the lower main rod. The inclination angle is 45°. Several diagonal rods are connected end to end and are evenly arranged in an N shape along the length direction of the main rod.

5. The sightseeing device for the main tower of a bridge according to claim 1, characterized in that, A horizontal viewing platform is arranged at the connection between the columnar part and the rhombic part of the main tower. The hoistway penetrates through the viewing platform and extends below the bridge deck. The viewing platform is circular, and the steel frame of the viewing platform is fixedly connected to each side face of the main tower.

6. The sightseeing device for the main tower of a bridge according to claim 5, characterized in that, The observation device for the main tower of the bridge also includes an observation staircase and a curtain wall. The observation elevator is arranged on one side face of the main tower, and the observation staircase is arranged along the other three side faces. The observation staircase is divided into several sections. Each section of the observation staircase is inclined and arranged on one side face of the main tower and is evenly arranged on the three side faces in a head-to-tail connection form; When the sightseeing staircase climbs along the three sides of the main tower in the clockwise or counterclockwise direction, it then turns back from the last side and continues to climb along the three sides of the main tower in the counterclockwise or clockwise direction; A partition handrail is provided in the middle of each section of the sightseeing staircase. The partition handrail is parallel to the corresponding sightseeing staircase and is used to separate the people going up and down; Curtain walls are provided on the outer sides of the three sides of the main tower without sightseeing elevators. The curtain walls include steel frames and toughened glass to protect the sightseeing staircase and the people on the staircase.

7. The sightseeing device for the main tower of a bridge according to claim 6, characterized in that, At the top of every three connected sections of the sightseeing staircase, a horizontal viewing platform is provided. The viewing platform is arranged around the three sides where the sightseeing staircase is set. The inner side of the viewing platform is fixedly connected to the side of the main tower, and the outer side is fixedly connected to the inner side of the curtain wall; The curtain wall is provided with several horizontal ventilation windows, and each ventilation window corresponds to a viewing platform; one side of the main tower corresponds to one curtain wall, and one ventilation window penetrates the curtain wall along the width direction of the corresponding curtain wall.

8. An installation method, characterized in that, The steps for installing the sightseeing device for a bridge main tower as claimed in claim 1 include the following steps: S1: On the bridge deck corresponding to the main tower, there are two sets of winch hoisting components. The two sets of winch hoisting components are respectively arranged on the outer sides of the length direction of the elevator shaft. The winch hoisting component includes a winch and a guide wheel bracket. The positions of the winch and the guide wheel bracket respectively correspond to both sides of the main tower in the width direction of the shaft, and the guide wheel bracket is close to the side of the main tower where the shaft is installed; S2: The ropes of the first winch and the second winch are respectively connected to the ring beams at both ends of the sectional shaft. The first winch vertically lifts the sectional shaft above the position where the sectional shaft is to be installed. At the same time, the second winch winds its own rope in coordination with the change in the height of the sectional shaft, but does not apply force; S3: The rope of the second winch is wound, and at the same time, the rope winding speed of the first winch is less than that of the second winch, so that the sectional shaft gradually flattens from the vertical state to the horizontal state while rising; S4: The ropes of the first winch and the second winch are unwound synchronously, and the sectional shaft is horizontally lowered to the installation position, and then welded to the top of the column of the lower sectional shaft; S5: Install the elevator inside the shaft.

9. The installation method according to claim 8, characterized in that, In step S1, the specific steps for setting the winch include the following steps: (1) Openings are respectively provided at the four top corners of each winch. Steel plates are pre-buried on the bridge deck at the bottom of the winch, and the four top corners are mechanically connected and fixed to the pre-buried steel plates to make the winch horizontal; (2) The guide wheel bracket includes a cross beam, a load-bearing beam and two support columns from top to bottom. The load-bearing beam is parallel to the width direction of the shaft. Both ends of the load-bearing beam are respectively fixedly connected to a support column. The support columns are vertical and the bottom is connected to the bridge deck. The cross beam is sleeved outside the load-bearing beam. One side of the bottom of the cross beam is connected to the guide wheel, and the guide wheel is above the bridge deck, and the other side is connected to the movable pulley below the bridge deck; A through hole is respectively opened on the bridge deck below the guide wheel and above the movable pulley for the rope of the winch to be lowered and lifted; (3)The rope of the winch extends horizontally and is connected to the corresponding guide pulley, then passes through the through hole below the guide pulley and out under the bridge deck, and then is connected to the corresponding movable pulley. After passing through the movable pulley, it passes upward through another through hole in the bridge deck and is fixedly connected to the corresponding cross beam.

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