A steep and narrow working condition of inverted siphon pipe bridge cable hoisting device dismantling method

Abstract

The application relates to the technical field of bridge construction, in particular to a dismantling method of a steep and narrow working condition inverted siphon pipe bridge cable hoisting device, which comprises the following steps: step one, main hoisting point and main rope dismantling; step two, arranging double-layer temporary cable wind; step three, reinforcing and protecting the automobile crane; step four, dismantling the main cable saddle; step five, adjusting the temporary cable wind; step six, unloading the structure cable wind; step seven, dismantling the tower top type steel distribution beam; step eight, installing the cable tower assembling frame; step nine, dismantling the horizontal connection at the main pipe; step ten, dismantling the subsequent support; step eleven, lowering the automobile crane tag joint; and step twelve, layer-by-layer dismantling according to the above steps, and the double-layer temporary cable wind is alternately lowered layer by layer. The application has the effects of simplifying the dismantling procedure of the inverted siphon pipe bridge cable hoisting device and improving the dismantling efficiency of the cable hoisting device.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a method for dismantling a cable-stayed installation device for an inverted siphon bridge in steep and narrow conditions. Background Technology

[0002] When a canal intersects a road or ditch at a similar elevation, a structure is needed to allow water to pass under the road or ditch. This structure is usually called an inverted siphon. This structure is simple and facilitates the removal of silt. It is a common type of grade-separated hydraulic structure used when canals intersect with roads or rivers, or when canals cross valleys. Moreover, inverted siphons do not require the artificial creation of a vacuum in the pipes when they start working, making them even more widespread.

[0003] Road and bridge construction refers to the surveying, design, construction, maintenance, and management of highways and bridges. Various situations can arise during road and bridge construction that affect the work, with rainwater and wastewater accumulation due to weather conditions being the most common issue in routine maintenance. Therefore, inverted siphon bridges are widely used. Cables are extensively used in bridge construction, and their application, particularly in inverted siphon bridges in steep and narrow conditions, is crucial.

[0004] The cable hoisting system described in the relevant technology consists of a hoisting and installation system, an arch box fastening system, and a stabilization system. The hoisting and installation system consists of a tower, hoisting cables (main load-bearing cable, lifting cable, traction cable), winch, and ground anchors. The arch box fastening system consists of a fastening frame, cable saddle, fastening cable, winch, and ground anchors. The stabilization system consists of guy cables, balance cables, and ground anchors.

[0005] However, the existing cable hoisting system dismantling procedure is too cumbersome, costly, and time-consuming. It is not only time-consuming and labor-intensive but also inefficient. Furthermore, the dismantling process requires the construction of many temporary devices, making the process quite complex. Summary of the Invention

[0006] To simplify the dismantling procedure of the cable-stayed bridge installation device and improve the dismantling efficiency, this application provides a method for dismantling the cable-stayed bridge installation device in steep and narrow working conditions.

[0007] The dismantling method for a cable hoisting device of an inverted siphon bridge in steep and narrow working conditions provided in this application adopts the following technical solution:

[0008] A method for dismantling a cable-stayed hoisting device for an inverted siphon bridge in steep and narrow working conditions includes the following steps:

[0009] S1. Main lifting point and main rope removal: The main lifting point is lowered directly to the ground, and then pulled by a trolley and horse to the vicinity of the top of the tower for removal.

[0010] S2. Install double-layer temporary cable wind;

[0011] S3. Reinforce and protect the truck crane;

[0012] S4. Remove the main cable saddle: Use a truck crane to remove the main cable saddle, cable saddle, diagonal bracing steel pipes and other structural steel in sequence;

[0013] S5. Adjust the temporary cable wind;

[0014] S6. Unloading structural cable wind: The structural cable wind is converted into temporary cable wind simultaneously and symmetrically step by step using jacks.

[0015] S7. Remove the steel distribution beam at the top of the tower;

[0016] S8. Install the cable tower assembly frame;

[0017] S9. Remove the horizontal connection of the main management office;

[0018] S10. Remove the subsequent support;

[0019] S11. Lower the truck's overhead crane section while maintaining the same initial free length;

[0020] S12. Dismantle layer by layer according to the above steps, and move the double-layer temporary cable down layer by layer alternately.

[0021] By adopting the above technical solutions, in actual operation, this dismantling method first reinforces and protects the truck crane, further improving its stability during the lifting process and reducing the possibility of tilting or overturning due to external factors. This improves the stability of the lifting process. In step two, the deployment of temporary guy wires further enhances the stability of the dismantling process. In step eight, the installation of the tower assembly frame facilitates the dismantling of the tower and the operation of the workers, reducing the accident rate. Thus, this dismantling method is orderly, progressive, and convenient, simplifying the dismantling procedure of the inverted siphon bridge cable hoisting device. It eliminates the need to construct many temporary devices during the dismantling process, reducing costs. Moreover, this dismantling method further improves the dismantling efficiency of the cable hoisting device.

[0022] Optionally, the main rope in S1 can be removed by dragging it off one by one using a loader.

[0023] By adopting the above technical solution, the loader can remove the main rope one by one by dragging it, which can improve the stability of the removal process.

[0024] Optionally, the trolley in S1 is installed on the load-bearing cable. The trolley is used to run back and forth along the load-bearing cable and to lift heavy objects. The trolley includes trolley wheels, a frame, a lifting pulley block and a traction system. The trolley wheels are set inside the cableway, and multiple trolley wheels are set in both the longitudinal and transverse directions of the bridge.

[0025] By adopting the above technical solution, under the action of the traction cable and the lifting cable, the trolley can run back and forth along the direction of the load-bearing cable and lift heavy objects, and then transport them to the splicing position, which is convenient and fast. At the same time, multiple trolley wheels are set in both the longitudinal and transverse directions of the bridge to improve the stability of the trolley during operation.

[0026] Optionally, the traction system includes a traction cable, an iron ring, a horizontal steering wheel, and a connecting rope. The iron ring is mounted on the connecting shaft between the trolley wheel and the fixed pulley. The horizontal steering wheel is mounted on the iron ring. The traction cable is arranged in a "two" configuration. The connecting rope connects the two trolleys.

[0027] By adopting the above technical solution, the traction cable is arranged in a "walk 2" pattern under the action of the iron ring and the horizontal steering wheel, which makes the traction cable layout reasonable. Since the main function of the traction cable is to move the sports car horizontally back and forth, it can improve the stability of the sports car during the movement process. Moreover, under the action of the connecting rope, the two sports cars can run synchronously.

[0028] Optionally, the reinforcement and protection of the truck crane in S3 includes the following steps:

[0029] S301, pour C30 concrete;

[0030] S302, Rolling and leveling the parking position of the truck crane;

[0031] S303. Drive steel pipe piles into the four corners of the truck crane.

[0032] S304. Anchor cables are connected to each steel pipe pile: one end of each of the four anchor cables is connected to one of the four steel pipe piles, and the other end is connected to the main beams at the four positions at the bottom of the truck crane.

[0033] S305. Adjust the tension of the anchor cables to ensure the stability of the truck crane.

[0034] By adopting the above technical solutions, the truck crane is reinforced and protected before lifting, which improves the stability of the truck crane's parking location, reduces the possibility of the truck crane tilting or overturning during the lifting and dismantling process due to external factors, and improves the stability of the lifting during the dismantling process.

[0035] Optionally, the removal of the main cable saddle in S4 includes the following steps:

[0036] S401. Inspect and repair the railings and operating platform of the tower top platform;

[0037] S402. Cut off the weld between the main cable saddle and the distribution beam;

[0038] S403, removal of I-beam distribution beams and diagonal bracing steel pipes;

[0039] S404. The cut steel sections are immediately lowered to the ground using a truck crane;

[0040] S405. Promptly clean the welding slag and other debris into the prepared bucket.

[0041] By adopting the above technical solutions, the main cable saddle removal process was carried out in an orderly and step-by-step manner, ensuring safety during the removal process.

[0042] Optionally, when adjusting the temporary cable wind in S5, the verticality of the tower needs to be observed.

[0043] By adopting the above technical solution, the structural cable wind tunnel is converted and adjusted to a temporary cable wind tunnel simultaneously and symmetrically (both banks, upstream and downstream) by jacks. By observing the verticality of the tower, the tilt of the tower is ensured to always be within a safe range.

[0044] Optionally, the cable tower assembly frame in S8 is installed between the main tower columns, with the bottom of the frame anchored by steel pins, and the frame height spanning between the two layers of main steel pipes.

[0045] By adopting the above technical solutions, the installation of the tower assembly frame increases the operating space, making it easier for operators to operate and for the tower to be dismantled.

[0046] Optionally, the cable tower assembly frame is equipped with clamps, which serve as the main platform for operators to use pneumatic wrenches to loosen the main steel pipe connecting bolts.

[0047] By adopting the above technical solution, the clamp is the main platform for operators to use pneumatic wrenches to loosen the main steel pipe connection bolts. The clamp provides convenience for operators during construction and also plays a role in safety protection.

[0048] Optionally, the removal of the main crossbar in S9 includes the following steps:

[0049] S901, Truck crane binding beam;

[0050] S902. Use a pneumatic wrench to loosen the bolts between the two crossbeams;

[0051] S903. A wooden plank-framed operating platform is constructed between the beams.

[0052] S904. Remove bolts and longitudinal members while retracting;

[0053] S905, The two ends of the bundled single crossbeam are bolted together with flanges and main steel pipes;

[0054] S906. Use a pneumatic wrench to loosen the bolt;

[0055] S907, transported to the ground by truck crane.

[0056] By adopting the above technical solution, the rapid dismantling of the horizontal connection of the main management office was achieved, and the stability and safety of the dismantling process were improved.

[0057] In summary, this application includes at least one of the following beneficial technical effects:

[0058] This dismantling and assembly method is not only simple to operate and low in cost, but also highly safe. Furthermore, the reinforcement and protection of the truck crane further ensures its stability during the lifting process, preventing tilting or overturning due to external factors. The temporary cable jack design improves stability during dismantling, and the installation of the tower assembly frame facilitates tower dismantling and worker operations. This design is orderly, progressive, convenient, safe, and effective, further improving the dismantling efficiency of the cable-stayed crane. Attached Figure Description

[0059] Figure 1 This is a flowchart of the dismantling method of the cable hoisting device for the inverted siphon bridge in steep and narrow working conditions described in this application;

[0060] Figure 2 This is a flowchart of the reinforcement and protection process for the truck crane in this application;

[0061] Figure 3 This is a flowchart of the removal of the main cable saddle in this application;

[0062] Figure 4 This is a flowchart of the demolition of the cross-link of the management office in this application. Detailed Implementation

[0063] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0064] This application discloses a method for dismantling a cable hoisting device for an inverted siphon bridge in steep and narrow working conditions, referring to... Figure 1 The dismantling method for the cable hoisting device of an inverted siphon bridge in steep and narrow working conditions includes the following steps:

[0065] S1. Main lifting point and main rope dismantling;

[0066] The main lifting point is lowered directly to the ground, then dismantled on-site and transported to the storage area. A trolley and horse-drawn tractor pull the ropes to the vicinity of the tower top for dismantling. The main ropes are dismantled one by one by a loader, thus achieving individual removal and improving stability during the process. Understandably, the lifting ropes must be completely relaxed during hoisting to prevent accidents caused by excessive tension.

[0067] Specifically, the trolley, also known as a transport trolley, is installed on the load-bearing cable. The trolley is used to travel back and forth along the load-bearing cable and to lift heavy objects. The trolley includes trolley wheels, a frame, a lifting pulley block, and a traction system. The trolley wheels are set inside the cableway. There are multiple trolley wheels in both the longitudinal and transverse directions. In this embodiment, there are 4 trolley wheels in the longitudinal direction and 8 in the transverse direction. Of course, the number of trolley wheels in the longitudinal and transverse directions and the diameter of the trolley wheels can be adjusted according to the actual working conditions.

[0068] Furthermore, the traction system includes a traction cable, an iron ring, a horizontal steering wheel, and a connecting rope. The iron ring is mounted on the connecting shaft between the trolley wheel and the fixed pulley, and the horizontal steering wheel is mounted on the iron ring. Under the action of the iron ring and the horizontal steering wheel, the traction cable is arranged in a "two-way" configuration. The connecting rope connects the two trolleys, enabling the trolleys to move synchronously and improving their stability during operation. In this embodiment, the connecting rope is made of steel wire rope.

[0069] S2. Install double-layer temporary cable wind;

[0070] The double-layer temporary cable wind is arranged at the main steel pipe of the tower.

[0071] S3. Reinforce and protect the truck crane;

[0072] Reinforcing and protecting the mobile crane before lifting increases the stability of the crane's parking area, reduces the possibility of the crane tilting or overturning during the lifting and dismantling process due to external factors, and improves the stability of the lifting process.

[0073] Specifically, refer to Figure 2 The reinforcement and protection of truck cranes includes the following steps:

[0074] S301. Pouring C30 concrete: Using C30 concrete as a base ensures that the load-bearing capacity at the parking location meets the standards.

[0075] S302, Rolling and leveling the parking position of the truck crane;

[0076] S303. Drive steel pipe piles into the four corners of the truck crane.

[0077] S304. Anchor cables are connected to each steel pipe pile: one end of each of the four anchor cables is connected to one of the four steel pipe piles, and the other end is connected to the main beams at the four positions at the bottom of the truck crane.

[0078] S305. Adjust the tension of the anchor cables to ensure the stability of the truck crane.

[0079] S4. Remove the main cable saddle;

[0080] After temporary cable winds are installed at the main steel pipe of the tower, the main cable saddle, the cable tie saddle, the diagonal bracing steel pipe and other structural steel are removed in sequence using a truck crane.

[0081] Specifically, refer to Figure 3 Removing the main cable saddle includes the following steps:

[0082] S401. Inspect and repair the railings and operating platform of the tower top platform;

[0083] S402. Cut off the weld between the main cable saddle and the distribution beam;

[0084] S403, removal of I-beam distribution beams and diagonal bracing steel pipes;

[0085] S404. The cut steel sections are immediately lowered to the ground using a truck crane;

[0086] S405. Promptly clean the welding slag and other debris into the prepared bucket.

[0087] S5. Adjust the temporary cable wind;

[0088] S6. Unloading structural cable wind;

[0089] During the unloading of temporary cable wind, the verticality of the tower needs to be observed, and the structural cable wind is converted to temporary cable wind by jacks simultaneously and symmetrically (both banks, upstream and downstream) step by step.

[0090] S7. Remove the steel distribution beam at the top of the tower;

[0091] S8. Install the cable tower assembly frame;

[0092] Specifically, the pylon assembly frame is installed between the main columns of the tower, and the bottom of the frame is anchored with steel pins. The frame spans between two layers of main steel pipes. The pylon assembly frame is equipped with clamps, which are the main platform for operators to use pneumatic wrenches to loosen the connecting bolts of the main steel pipes. The arrangement of the pylon assembly frame and clamps increases the operating space and makes it easier for operators to operate and dismantle the tower.

[0093] S9. Remove the horizontal connection of the main management office;

[0094] Specifically, refer to Figure 4 The removal of the main management office's crossbar includes the following steps:

[0095] S901, Truck crane binding beam;

[0096] S902. Use a pneumatic wrench to loosen the bolts between the two crossbeams;

[0097] S903. A wooden plank-framed operating platform is constructed between the beams.

[0098] S904. Remove bolts and longitudinal members while retracting;

[0099] S905, The two ends of the bundled single crossbeam are bolted together with flanges and main steel pipes;

[0100] S906. Use a pneumatic wrench to loosen the bolt;

[0101] S907, transported to the ground by truck crane.

[0102] S10. Remove the subsequent support;

[0103] S11. Lower the truck's overhead crane section while maintaining the same initial free length;

[0104] S12. Dismantle layer by layer according to the above steps, and move the double-layer temporary cable down layer by layer alternately.

[0105] The implementation principle of the dismantling method for a cable-stayed bridge in steep and narrow working conditions according to an embodiment of this application is as follows: In actual operation, this dismantling method is orderly, progressive, and convenient. First, the main lifting point and main rope are dismantled. Then, the double-layer temporary guy wires are arranged, the main cable saddle is removed, and the structural guy wires are unloaded in sequence. Next, the steel distribution beam at the top of the tower is dismantled, the tower assembly frame is installed, and the main cross bracing is dismantled. Finally, the double-layer temporary guy wires are moved down alternately layer by layer to complete the dismantling work. This dismantling method reinforces and protects the truck crane, further improving the stability of the truck crane during the lifting process and the safety of the lifting during dismantling. At the same time, the layout of the temporary guy wires improves the stability during the dismantling process. The installation of the tower assembly frame is more conducive to the operation of the operators and the dismantling of the tower, reducing the accident rate. In this way, the dismantling procedure of the cable-stayed bridge is simplified, and many temporary equipment is no longer needed during the dismantling process, thereby reducing costs. Moreover, this dismantling method further improves the dismantling efficiency of the cable-stayed bridge.

[0106] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A steep and narrow working condition of the inverted siphon pipe bridge cable hoisting device dismantling method, characterized by: It comprises the following steps: S1, main hoisting point, main rope removal: the main hoisting point is directly lowered to the ground, the car and the horse are pulled to the vicinity of the tower top, and then removed; S2, arrange double-layer temporary cable wind; S3, reinforce and protect the automobile crane; S301, pour C30 concrete; S302, roll and level the automobile crane parking position; S303, steel pipe piles are respectively punched in the four corners of the automobile crane; S304, connect anchor cable on each steel pipe pile: one end of four anchor cables is respectively connected on four steel pipe piles, and the other end is respectively connected on the main beam of the four corners of the automobile crane bottom; S305, adjust the tightness of the anchor cable to ensure the firmness of the automobile crane parking; S4, remove the main cable saddle: use the automobile crane to remove the main cable saddle, the buckle cable saddle and the inclined bracing steel pipe in turn; S5, adjust the temporary cable wind; S6, unload the structure cable wind: the structure cable wind is converted to the temporary cable wind by the jack at the same time and symmetrically and step by step; S7, remove the tower top profile steel distribution beam; S8, install the cable tower assembly frame; S9, remove the main pipe horizontal connection; S10, remove the subsequent support; S11, lower the automobile crane marker joint, keep the same initial free length; S12, carry out layer-by-layer removal according to the above steps, and the double-layer temporary cable wind is alternately lowered layer by layer; The cable tower assembly frame in S8 is installed between the tower column main pipes, the frame bottom is anchored by a steel pin, and the frame height is across two layers of main steel pipes; The cable tower assembly frame is provided with a hoop, which is the main platform for workers to use a pneumatic wrench to remove the main steel pipe connecting bolt.

2. The method of removing a steep, narrow work condition inverted siphon bridge cable hoisting device of claim 1, wherein: The removal method of the main rope in S1 is to pull it by a single loader.

3. The method of removing a steep, narrow work condition inverted siphon bridge cable hoisting device of claim 1, wherein: The car in S1 is installed on the bearing cable, which is used for running back and forth along the bearing cable and lifting heavy objects, and the car comprises a car wheel, a frame, a hoisting pulley block and a traction system, the car wheel is arranged in a cableway, and a plurality of car wheels are arranged in the longitudinal and transverse directions.

4. The method of removal of steep and narrow working condition inverted siphon bridge cable hoisting device according to claim 3, characterized in that: The traction system comprises a traction cable, a ferrule, a horizontal steering wheel and a car coupling rope, the ferrule is arranged on the connecting shaft of the car wheel and the fixed pulley, the horizontal steering wheel is installed on the ferrule, the traction cable is arranged in a "2" shape, and the car coupling rope is connected between two cars.

5. The method of removing the steep, narrow work condition inverted siphon bridge cable hoisting device of claim 1, wherein: The main cable saddle removal in S4 comprises the following steps: S401, check the rail and operation platform of the tower top platform; S402, cut off the weld between the main cable saddle and the distribution beam; S403, cut off the I-beam distribution beam and the inclined bracing steel pipe; S404, immediately lower the cut-off profile steel to the ground by the automobile crane; S405, clean the welding slag into a prepared bucket in time.

6. The method of removing a steep, narrow work condition inverted siphon bridge cable hoisting device of claim 1, wherein: When the temporary cable wind is adjusted in S5, the verticality of the tower should be observed.

7. The method of removing a steep, narrow work condition inverted siphon bridge cable hoisting device of claim 1, wherein: The main pipe horizontal connection removal in S9 comprises the following steps: S901, the automobile crane binds the cross beam; S902, the pneumatic wrench loosens the bolt between the two cross beams; S903, the wooden board is erected to form an operation platform between the cross beams; S904, the bolt and the longitudinal rod are removed while retreating; S905, the two ends of the bound single cross beam are connected by flanges and main steel pipes through bolt connection; S906, the pneumatic wrench removes the bolt; S907, the automobile crane is transported to the ground.

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