Installation device and method for composite cable saddle in narrow cavern of mountain suspension bridge

Abstract

The present application relates to an installation device and method for a composite saddle in a narrow cavern of a mountain suspension bridge, and belongs to the technical field of suspension bridge erection construction. The installation device includes a gantry, which is located in a tunnel anchor hole, with the front end of the gantry close to the hole opening of the tunnel anchor hole, and the rear end of the gantry extending to the top surface of the composite saddle pier; a sliding bracket, which is located at the top of the gantry and reciprocates linearly on the gantry, and the top of the sliding bracket is provided with a steering pulley and a hanging wire rope for hanging the composite saddle component; a winch, which is located at the hole opening of the tunnel anchor hole, and the winch is provided with a lifting wire rope wound around the steering pulley for lifting the composite saddle component. The installation device of the present application sets a gantry in the tunnel anchor hole, and sets a sliding bracket on the top of the gantry. The gantry provides force support and motion guidance for the sliding bracket to hang and move the composite saddle component, so as to facilitate the one-time movement of the composite saddle component to the top of the composite saddle pier, which is easy to operate and has low construction cost.

Description

Technical Field

[0001] The present application relates to the technical field of suspension bridge erection construction, and in particular to an installation device and method for a composite cable saddle in a narrow cavern of a mountain suspension bridge. Background Art

[0002] In order to save investment, mountain suspension bridges use existing terrain and tunnel anchors to anchor the main cable to the mountain. Conventional mountain suspension bridges are generally equipped with main cable saddles and loose cable saddles. The main cable saddle is set at the top of the main tower and is hoisted into place by the main cable saddle hoisting gantry; the loose cable saddle is set at the entrance of the tunnel anchor hole. Because it is close to the hole and the hoisting height is small, it is hoisted into place by a loose cable saddle hoisting gantry crane or a large crane.

[0003] The world's first composite cable saddle is the Jinsha River Bridge on the Xiangli Expressway under construction. The composite cable saddle of the bridge is set at the entrance of the tunnel anchor hole. Due to the large weight of the composite cable saddle, the weight of a single unit is usually 200 tons. All existing roads do not have the conditions for transporting the composite cable saddle as a whole. Generally, it is manufactured, transported and hoisted to the designed position in blocks, then welded or bolted into a whole, and finally the composite cable saddle is accurately positioned through its own plane fine-tuning device.

[0004] As the tunnel anchor hole length of the tunnel anchor is 37m and the height of the IP point of the main cable of the suspension bridge from the top of the hole is only 2.0m, after the composite saddle is transported in blocks by a flatbed truck to the side of the composite saddle pier foundation, the large crane cannot carry out the lifting operation of the composite saddle due to the small space in the hole and the difficulty in extending the boom, so the composite saddle installation operation cannot be realized in the tunnel anchor hole.

[0005] The weight of the composite saddle after segmentation is generally 50t or less. Due to the limited rated lifting capacity of the winch, a pulley block is usually added to the front end of the winch to achieve the lifting of the heavy saddle. The pulley block itself consists of a movable pulley, a fixed pulley, etc. Due to limited space, its height occupies the lifting height of the composite saddle, and the composite saddle cannot be lifted to the designed height.

[0006] The conventional gantry hoisting scheme is to set the winch directly above the gantry. Due to the small space in the tunnel anchor hole, the IP point of the suspension bridge main cable is only 2.0m above the cave top, and the winch itself cannot be moved or hoisted directly above the gantry.

[0007] Considering that it is the first time to install a composite cable saddle in a tunnel anchor hole, and the space in the tunnel anchor hole is extremely small, it is certain that the existing technology cannot solve the problem of installing a composite cable saddle in a tunnel anchor hole. Summary of the invention

[0008] The embodiments of the present application provide a device and method for installing a composite cable saddle in a narrow cavern of a mountain suspension bridge, so as to solve the problem that the existing technology in the related art cannot solve the problem that the composite cable saddle is installed in a tunnel anchor hole.

[0009] The first aspect of the embodiment of the present application provides an installation device for a composite cable saddle in a narrow cave of a mountain suspension bridge, comprising:

[0010] A gantry, which is located in the tunnel anchor hole, with the front end of the gantry close to the hole opening of the tunnel anchor hole and the rear end of the gantry extending to the top surface of the composite saddle buttress;

[0011] A sliding bracket, which is located on the top of the gantry and is slidably connected to the gantry, and a steering pulley and a hanging wire rope for hanging a composite saddle component are provided on the top of the sliding bracket;

[0012] A winch is located at the opening of the tunnel anchor hole, and the winch is provided with a lifting wire rope wound around the diverting pulley for lifting the composite saddle component.

[0013] In some embodiments: the portal frame includes a column and a distribution beam located at the top of the column, the top of the distribution beam is fixed with a slide beam extending toward the top surface of the composite saddle pier, and the top of the slide beam is provided with a track for slidingly connecting the sliding bracket.

[0014] In some embodiments: two distribution beams are provided, the two distribution beams are parallel to each other and spaced apart, both sides of the two distribution beams are provided with the columns, and the bottom and side walls of the columns are provided with embedded parts connected to the tunnel anchor hole;

[0015] There are two slideway beams, which are parallel to each other and spaced apart. One end of the two slideway beams is connected to the distribution beam, and the other end is connected to the top surface of the composite saddle buttress.

[0016] In some embodiments: the sliding bracket is a rectangular frame structure, and a roller slidably connected to the door frame is provided at the bottom of the sliding bracket;

[0017] The door frame is provided with a fall chain for pulling the sliding bracket to move, one end of the fall chain is connected to the sliding bracket, and the other end of the fall chain is connected to the door frame.

[0018] In some embodiments: a limiting member for positioning the sliding bracket on the door frame is provided at the bottom of the sliding bracket, and the limiting member is detachably connected to the door frame by bolts.

[0019] In some embodiments: the sliding bracket includes a plurality of beams, the plurality of beams are connected end to end to form a rectangular structure, and the ends of two beams parallel to each other are provided with legs;

[0020] A hoisting distribution beam is fixedly arranged on the top of the crossbeam, and the steering pulley is fixedly connected to the hoisting distribution beam. There are a plurality of steering pulleys, and the plurality of steering pulleys are arranged at intervals along the length direction of the hoisting distribution beam.

[0021] In some embodiments: the winch is connected to the lifting wire rope via a pulley block.

[0022] In some embodiments: the pulley block includes a fixed pulley block, a movable pulley block and a steel wire rope, the steel wire rope passes through the pulleys of the fixed pulley block and the movable pulley block in sequence, and the end of the steel wire rope is connected to the winch;

[0023] The movable pulley block is connected to the lifting wire rope, and the fixed pulley block is connected to the ground of the tunnel anchor hole through a ground anchor.

[0024] In some embodiments: the diameters of the hanging steel wire rope and the lifting steel wire rope are both greater than or equal to 60 mm, and the door frame and the sliding bracket are both welded by I-beams and / or channel steels.

[0025] A second aspect of the present application provides a method for installing a composite cable saddle in a narrow chamber of a mountain suspension bridge, the method using the installation device for the composite cable saddle in a narrow chamber of a mountain suspension bridge described in any of the above embodiments, the method comprising the following steps:

[0026] The composite cable saddle component is transported to the side of the composite cable saddle buttress in the tunnel anchor hole and is located below the portal frame;

[0027] Moving the sliding bracket on the door frame to above the composite cable saddle component and positioning the sliding bracket on the door frame through a limiting piece;

[0028] Wind the lifting wire rope around the diverting pulley on the sliding bracket, and reliably connect the lifting wire rope to the composite saddle component;

[0029] Start the winch to reel in the wire rope of the pulley block, and the pulley block pulls the lifting wire rope to lift the composite cable saddle component upwards. The lifting stops when the composite cable saddle component is higher than the top surface of the composite cable saddle buttress;

[0030] The composite saddle component is hung on the sliding bracket by using the hanging wire rope, and the winch releases the wire rope of the pulley block;

[0031] Release the limiter of the sliding bracket, install a fall chain between the sliding bracket and the door frame, and use the fall chain to pull the sliding bracket to move the composite cable saddle component to the top of the composite cable saddle pier;

[0032] Position the sliding bracket on the gantry through the limiter, start the winch to reel in the wire rope of the pulley block, then remove the hanging wire rope, and use the winch to release the wire rope of the pulley block to lower the composite cable saddle component and install it on the composite cable saddle pier;

[0033] Repeat the above steps to install all remaining composite saddle components onto the composite saddle buttresses.

[0034] The beneficial effects of the technical solution provided by this application include:

[0035] The embodiment of the present application provides an installation device and method for a composite saddle in a narrow cavern of a mountain suspension bridge. The installation device of the application is provided with a gantry, which is located in a tunnel anchor hole, with the front end of the gantry close to the opening of the tunnel anchor hole, and the rear end of the gantry extending to the top surface of the composite saddle pier; a sliding bracket, which is located on the top of the gantry and is slidably connected to the gantry, and the top of the sliding bracket is provided with a steering pulley and a hanging wire rope for hanging the composite saddle component; a winch, which is located at the opening of the tunnel anchor hole, and the winch is provided with a lifting wire rope wound around the steering pulley for lifting the composite saddle component.

[0036] Therefore, the installation device of the present application sets a gantry in the tunnel anchor hole, and sets a sliding bracket on the top of the gantry. The gantry provides force support and movement guidance for the sliding bracket to hang and move the composite cable saddle component, which is convenient for moving the composite cable saddle component to the top of the composite cable saddle pier at one time, and is easy to operate and has low construction cost. The present application sets a winch at the entrance of the tunnel anchor hole, and lifts the composite cable saddle component to a set height through the winch and the lifting wire rope, which solves the problem that traditional lifting devices are difficult to apply in narrow tunnel anchor holes. At the same time, the winch of the present application is set at the entrance of the tunnel anchor hole, which is convenient for recycling the winch after all the composite cable saddle components are installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic diagram of the state where the sliding bracket implemented in this application is located at the front end of the door frame;

[0039] Figure 2 A schematic diagram of the state where the sliding bracket implemented in this application is located at the rear end of the door frame;

[0040] Figure 3 for Figure 1 The cross-sectional view along the AA direction;

[0041] Figure 4 for Figure 1 The cross-sectional view along the BB direction;

[0042] Figure 5 A schematic diagram of the structure of the sliding bracket implemented in this application;

[0043] Figure 6 This is a schematic diagram of the structure of the winch, pulley block and lifting wire rope implemented in this application.

[0044] Reference numerals:

[0045] 1. Gantry; 2. Sliding bracket; 3. Winch; 4. Pulley block; 5. Lifting wire rope; 6. Hanging wire rope; 7. Falling chain; 8. Composite saddle component; 9. Composite saddle support pier; 10. Tunnel anchor hole;

[0046] 11. Distribution beam; 12. Slideway beam; 13. Track; 14. Column; 15. Embedded parts; 21. Lifting distribution beam; 22. Steering pulley; 23. Roller; 24. Limiting parts; 25. Outrigger; 26. Crossbeam; 41. Fixed pulley block; 42. Movable pulley block; 43. Wire rope; 44. Ground anchor. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0048] The embodiments of the present application provide a device and method for installing a composite cable saddle in a narrow cavern of a mountain suspension bridge, which can solve the problem that the existing technology in the related art cannot solve the problem of installing a composite cable saddle in a tunnel anchor hole.

[0049] See also Figure 1 , Figure 2 and Figure 4 As shown, the first aspect of the embodiment of the present application provides an installation device for a composite cable saddle in a narrow cave of a mountain suspension bridge, comprising:

[0050] The portal frame 1 is fixedly located in the tunnel anchor hole 10, with the front end of the portal frame 1 close to the hole opening of the tunnel anchor hole 10, and the rear end of the portal frame 1 extends to the top surface of the composite cable saddle pier 9 and is fixedly connected to the top surface of the composite cable saddle pier 9.

[0051] The sliding bracket 2 is located at the top of the portal frame 1 and is slidably connected to the portal frame 1. The sliding bracket 2 can reciprocate linearly on the portal frame 1. A steering pulley 22 and a hanging wire rope 6 for hanging a composite saddle component 8 are provided on the top of the sliding bracket 2.

[0052] The hoist 3 is fixed on the ground at the entrance of the tunnel anchor hole 10, and the hoist 3 is provided with a lifting wire rope 5 wound on a diverting pulley 22 for lifting the composite saddle member 8. The diameters of the hanging wire rope 6 and the lifting wire rope 5 are both greater than or equal to 60 mm, and the hanging wire rope 6 and the lifting wire rope 5 have sufficient structural strength when the composite saddle member 8 with a lifting weight of 50 t is met.

[0053] The installation device of the present application has a gantry 1 set in a tunnel anchor hole 10, and a sliding bracket 2 is set on the top of the gantry 1. The gantry 1 provides force support and movement guidance for the sliding bracket 2 to hang and move the composite saddle component 8, which is convenient for moving the composite saddle component 8 to the top of the composite saddle pier 9 at one time. The operation is convenient and the construction cost is low.

[0054] The present application sets the winch 3 at the opening of the tunnel anchor hole 10, and lifts the composite saddle component 8 to a set height through the winch 3 and the lifting wire rope 5, thereby solving the problem that the traditional lifting device is difficult to apply in the narrow tunnel anchor hole. At the same time, the winch 3 of the present application is set at the opening of the tunnel anchor hole 10, and the winch 3 is easy to recycle after the composite saddle component 8 is fully installed.

[0055] In some alternative embodiments: See Figure 1 , Figure 2 and Figure 4 As shown, the embodiment of the present application provides an installation device for a composite cable saddle in a narrow cavern of a mountain suspension bridge. The portal frame 1 of the installation device includes a column 14 and a distribution beam 11 located on the top of the column 14. Two distribution beams 11 are provided, and the two distribution beams 11 are parallel to each other and spaced apart. Columns 14 are provided on both sides of the two distribution beams 11. Embedded parts 15 connected to the tunnel anchor hole 10 are provided on the bottom and side walls of the columns 14. The embedded parts 15 are used to enhance the structural strength of the columns 14. The portal frame 1 is welded from I-beams or channel steels.

[0056] A slideway beam 12 extending toward the top surface of the composite saddle buttress 9 is fixedly provided on the top of the distribution beam 11. Two slideway beams 12 are provided, and the two slideway beams 12 are parallel to each other and arranged at intervals. One end of the two slideway beams 12 is vertically connected to the distribution beam 11, and the other end of the two slideway beams 12 is fixedly connected to the top surface of the composite saddle buttress 9. A track 13 for slidingly connecting the sliding bracket 2 is provided on the top of the two slideway beams 12, and the sliding bracket 2 reciprocates linearly on the track 13 along the length direction of the track 13.

[0057] In some alternative embodiments: See Figure 1 , Figure 2 and Figure 5As shown, an embodiment of the present application provides an installation device for a composite cable saddle in a narrow cavern of a mountain suspension bridge. The sliding bracket 2 of the installation device is a rectangular frame structure, and a roller 23 is provided at the bottom of the sliding bracket 2 which is slidably connected to the track 13 of the portal 1.

[0058] The sliding bracket 2 includes four beams 26, which are connected end to end to form a rectangular structure. The ends of two parallel beams 26 are provided with legs 25, and there are four legs 25. The rollers 23 are located at the bottom of the legs 25 and are rotatably connected to the legs 25.

[0059] A hoisting distribution beam 21 is fixedly arranged on the top of the crossbeam 26, and the hoisting distribution beam 21 is perpendicular to the rail 13 of the gantry. A steering pulley 22 is fixedly connected to the hoisting distribution beam 21, and there are three steering pulleys 22 on the hoisting distribution beam 21, which are arranged at intervals along the length direction of the hoisting distribution beam 21.

[0060] The middle steering pulley 22 of the three steering pulleys 22 is used to provide motion guidance and force support for the lifting wire rope 5; the steering pulleys 22 located on both sides of the three steering pulleys 22 are used to hang the hanging wire rope 6 respectively, and provide force support for the hanging wire rope 6 to hang the composite saddle component 8. The sliding bracket 2 is welded by I-beams or channel steels.

[0061] In some alternative embodiments: See Figures 1 to 3 As shown, an embodiment of the present application provides an installation device for a composite cable saddle in a narrow cave of a mountain suspension bridge. A fall chain 7 for pulling a sliding bracket 2 to move is provided on a gantry 1 of the installation device. One end of the fall chain 7 is connected to the sliding bracket 2, and the other end of the fall chain 7 is connected to the gantry 1.

[0062] When driving the sliding bracket 2 to move on the gantry 1, the length of the fall chain 7 is adjusted to pull the sliding bracket 2 to move on the gantry 1 in a set direction and speed. Of course, the movement of the sliding bracket 2 on the gantry 1 is not limited to the use of the fall chain 7. Those skilled in the art can use a hydraulic cylinder capable of realizing linear motion, a gear rack structure, etc.

[0063] In some alternative embodiments: See Figure 2 As shown, an embodiment of the present application provides an installation device for a composite saddle in a narrow cavern of a mountain suspension bridge. The bottom of the sliding bracket 2 of the installation device is provided with a limiting member 24 for positioning the sliding bracket 2 on the portal frame 1, and the limiting member 24 is detachably connected to the slide beam 12 by bolts.

[0064] When the winch 3 and the lifting wire rope 5 are lifting or lowering the composite saddle component 8, the sliding bracket 2 needs to be fixed to the door frame 1 through the limiter 24 to prevent the sliding bracket 2 from being displaced or overturned due to the horizontal component force.

[0065] In some alternative embodiments: See Figure 1 , Figure 2 and Figure 6 As shown, an embodiment of the present application provides an installation device for a composite cable saddle in a narrow cavern of a mountain suspension bridge, wherein a winch 3 of the installation device is connected to a lifting wire rope 5 via a pulley block 4 .

[0066] The pulley block 4 includes a fixed pulley block 41, a movable pulley block 42 and a wire rope 43. The wire rope 43 passes through the pulleys of the fixed pulley block 41 and the movable pulley block 42 in sequence, and its end is connected to the winch 3. The wire rope 43 is wound around the movable pulley block 42 for six turns.

[0067] The movable pulley block 42 is connected to the lifting wire rope 5, and the fixed pulley block 41 is connected to the ground of the tunnel anchor hole 10 through the ground anchor 44. The pulley block 4 of this embodiment is used to save labor. When the tonnage of the hoisting machine 3 is large enough, the pulley block 4 can be omitted, and the hoisting machine 3 can directly lift the composite saddle component 8 through the lifting wire rope 5.

[0068] See also Figures 1 to 6 As shown, the second aspect of the embodiment of the present application provides a method for installing a composite cable saddle in a narrow cave of a mountain suspension bridge. The method uses the installation device for the composite cable saddle in a narrow cave of a mountain suspension bridge described in the above embodiment. The method includes the following steps:

[0069] Step 1: Use a flatbed truck to transport the composite saddle component 8 to the side of the composite saddle buttress 9 in the tunnel anchor hole 10 and to a position below the portal frame 1.

[0070] Step 2: Move the sliding bracket 2 on the door frame 1 to above the composite saddle component 8 and position the sliding bracket 2 on the door frame 1 through the limiting member 24 .

[0071] Step 3: Wind the lifting wire rope 5 around the diverting pulley 22 on the sliding bracket 2, and reliably connect the free end of the lifting wire rope 5 to the composite saddle component 8.

[0072] Step 4, start the winch 3 to reel in the wire rope 43 of the pulley block 4, the winch 3 and the pulley block 4 pull the lifting wire rope 5 to lift the composite cable saddle component 8 upward, and stop lifting after the composite cable saddle component 8 is lifted to a position higher than the top surface of the composite cable saddle pier 9.

[0073] Step 5: Use the hanging wire rope 6 to hang the composite saddle component 8 on the steering pulley 22 of the sliding bracket 2. The gravity of the composite saddle component 8 is transferred from the lifting wire rope 5 to the hanging wire rope 6. The winch 3 releases the wire rope 43 of the pulley block 4.

[0074] Step 6, release the limit piece 24 of the sliding bracket 2, install the fall chain 7 between the sliding bracket 2 and the door frame 1, and use the fall chain 7 to pull the sliding bracket 2 to translate the composite cable saddle component 8 to the top of the composite cable saddle pier 9.

[0075] Step 7, position the sliding bracket 2 on the door frame 1 through the limiter 24, start the winch 3 to reel in the wire rope 43 of the pulley block 4 and then remove the hanging wire rope 6, the gravity of the composite saddle component 8 is transferred from the hanging wire rope 6 to the lifting wire rope 5, the winch 3 loosens the wire rope 43 of the pulley block 4 to lower the composite saddle component 8 and install it on the composite saddle pier 9.

[0076] Step 8: Repeat steps 1 to 7 to install all remaining composite saddle components 8 onto the composite saddle buttresses 9.

[0077] How it works

[0078] The embodiment of the present application provides an installation device and method for a composite saddle in a narrow cavern of a mountain suspension bridge. The installation device of the application is provided with a gantry 1, which is located in a tunnel anchor hole 10, with the front end of the gantry 1 close to the hole opening of the tunnel anchor hole 10, and the rear end of the gantry 1 extends to the top surface of the composite saddle pier 9; a sliding bracket 2, which is located at the top of the gantry 1 and reciprocates linearly on the gantry 1, and the top of the sliding bracket 2 is provided with a steering pulley 22 and a hanging wire rope 6 for hanging the composite saddle component 8; a winch 3, which is located at the hole opening of the tunnel anchor hole 10, and the winch 3 is provided with a lifting wire rope 5 wound around the steering pulley 22 for lifting the composite saddle component 8.

[0079] The installation device of the present application sets a gantry 1 in the tunnel anchor hole 10, and sets a sliding bracket 2 on the top of the gantry 1. The gantry 1 provides force support and movement guidance for the sliding bracket 2 to hang and move the composite saddle component 8, which is convenient for moving the composite saddle component 8 to the top of the composite saddle pier 9 at one time, and is easy to operate and has low construction cost. The present application sets the winch 3 at the entrance of the tunnel anchor hole 10, and lifts the composite saddle component 8 to a set height through the winch 3 and the lifting wire rope 5, which solves the problem that traditional lifting devices are difficult to use in narrow tunnel anchor holes. At the same time, the winch 3 of the present application is set at the entrance of the tunnel anchor hole 10, and the winch 3 is easy to recycle after the composite saddle component 8 is fully installed.

[0080] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0081] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0082] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. The installation device of composite cable saddle in narrow cave of mountain suspension bridge is characterized by: include: A portal frame (1) is located in a tunnel anchor hole (10), the front end of the portal frame (1) is close to the opening of the tunnel anchor hole (10), and the rear end of the portal frame (1) extends to the top surface of the composite saddle buttress (9); A sliding bracket (2) is located on the top of the door frame (1) and is slidably connected to the door frame (1), and a steering pulley (22) and a hanging wire rope (6) for hanging a composite saddle component (8) are provided on the top of the sliding bracket (2); A hoist (3) located at the opening of the tunnel anchor hole (10), the hoist (3) being provided with a lifting wire rope (5) wound around the diverting pulley (22) for lifting the composite saddle component (8); The sliding bracket (2) comprises a plurality of cross beams (26), wherein the plurality of cross beams (26) are connected end to end to form a rectangular structure, and the ends of two cross beams (26) parallel to each other are each provided with a support leg (25); A hoisting distribution beam (21) is fixedly arranged on the top of the crossbeam (26), and the steering pulley (22) is fixedly connected to the hoisting distribution beam (21). A plurality of steering pulleys (22) are provided, and the plurality of steering pulleys (22) are arranged at intervals along the length direction of the hoisting distribution beam (21).

2. The installation device for the composite saddle of a narrow cavern of a mountain suspension bridge as claimed in claim 1, characterized in that: The door frame (1) comprises a column (14) and a distribution beam (11) located on the top of the column (14); a slideway beam (12) extending toward the top surface of the composite saddle buttress (9) is fixedly provided on the top of the distribution beam (11); and a track (13) for slidably connecting the sliding bracket (2) is provided on the top of the slideway beam (12).

3. The installation device for the composite saddle of a narrow cavern of a mountain suspension bridge as claimed in claim 2, characterized in that: Two distribution beams (11) are provided, the two distribution beams (11) are parallel to each other and spaced apart, the columns (14) are provided on both sides of the two distribution beams (11), and the bottom and side walls of the columns (14) are provided with embedded parts (15) connected to the tunnel anchor hole (10); Two slideway beams (12) are provided, and the two slideway beams (12) are parallel to each other and spaced apart. One end of the two slideway beams (12) is connected to the distribution beam (11), and the other end is connected to the top surface of the composite saddle buttress (9).

4. The installation device for the composite saddle of a narrow cavern of a mountain suspension bridge as claimed in claim 1, characterized in that: The sliding bracket (2) is a rectangular frame structure, and a roller (23) is provided at the bottom of the sliding bracket (2) and is slidably connected to the door frame (1); The door frame (1) is provided with a fall chain (7) for pulling the sliding bracket (2) to move, one end of the fall chain (7) is connected to the sliding bracket (2), and the other end of the fall chain (7) is connected to the door frame (1).

5. The installation device for the composite cable saddle in a narrow cave of a mountain suspension bridge according to claim 1 or 4, characterized in that: A stopper (24) for positioning the sliding bracket (2) on the door frame (1) is provided at the bottom of the sliding bracket (2); the stopper (24) and the door frame (1) are detachably connected via bolts.

6. The installation device for composite cable saddles in narrow chambers of mountain suspension bridges as claimed in claim 1, characterized in that: The hoisting machine (3) and the lifting wire rope (5) are connected via a pulley block (4).

7. The installation device for composite cable saddles in narrow chambers of mountain suspension bridges as claimed in claim 6, characterized in that: The pulley block (4) comprises a fixed pulley block (41), a movable pulley block (42) and a steel wire rope (43), wherein the steel wire rope (43) passes through the pulleys of the fixed pulley block (41) and the movable pulley block (42) in sequence, and the end of the steel wire rope (43) is connected to the hoist (3); The movable pulley block (42) is connected to the lifting wire rope (5), and the fixed pulley block (41) is connected to the ground of the tunnel anchor hole (10) through a ground anchor (44).

8. The installation device for composite cable saddles in narrow chambers of mountain suspension bridges as claimed in claim 1, characterized in that: The diameters of the hanging steel wire rope (6) and the lifting steel wire rope (5) are both greater than or equal to 60 mm, and the door frame (1) and the sliding bracket (2) are both welded from I-beams and / or channel steels.

9. The installation method of composite cable saddle in narrow cavern of mountain suspension bridge is characterized by: The method uses the installation device for the narrow cave composite saddle of a mountain suspension bridge according to any one of claims 1 to 8, and the method comprises the following steps: The composite cable saddle component (8) is transported to the side of the composite cable saddle buttress (9) in the tunnel anchor hole (10) and is located below the portal frame (1); Moving the sliding bracket (2) on the door frame (1) to the top of the composite saddle component (8) and positioning the sliding bracket (2) on the door frame (1) through a stopper (24); Winding the lifting steel wire rope (5) around the diverting pulley (22) on the sliding bracket (2), and reliably connecting the lifting steel wire rope (5) to the composite saddle component (8); The winch (3) is started to wind up the steel wire rope (43) of the pulley block (4), and the pulley block (4) pulls the lifting steel wire rope (5) to lift the composite cable saddle component (8) upward, and the lifting stops after the composite cable saddle component (8) is higher than the top surface of the composite cable saddle buttress (9); The composite saddle component (8) is hung on the sliding bracket (2) by using a hanging steel wire rope (6), and the hoist (3) releases the steel wire rope (43) of the pulley block (4); Release the stopper (24) of the sliding bracket (2), install a fall chain (7) between the sliding bracket (2) and the door frame (1), and use the fall chain (7) to pull the sliding bracket (2) to move the composite cable saddle component (8) to the top of the composite cable saddle buttress (9); The sliding bracket (2) is positioned on the door frame (1) through the stopper (24), the hoist (3) is started to wind up the steel wire rope (43) of the pulley block (4), and then the hanging steel wire rope (6) is removed; the hoist (3) releases the steel wire rope (43) of the pulley block (4), and the composite cable saddle component (8) is lowered and installed on the composite cable saddle buttress (9); Repeat the above steps to install all remaining composite saddle components (8) onto the composite saddle buttress (9).

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