A connection and air supply device for the internal pipe of a main cable and a method for installing and supplying air.

Abstract

This invention discloses a connection and air supply device for the internal duct of a main cable and a method for its installation. The connection device includes a fixed connecting strand, a strand anchor head, an adjusting device, an air chamber, and a hollow spiral joint for connecting to the duct inside the main cable. The fixed connecting strand is installed inside the cable saddle, and the portion of the fixed connecting strand extending out of the cable saddle is connected to the strand anchor head. The strand anchor head is connected to the closed end of the air chamber via an adjustable length adjusting device, and the open end of the air chamber is connected to the hollow spiral joint. The air chamber is connected to an air source via a branch air pipe, allowing gas from the air source to flow from the open end of the hollow spiral joint into the duct inside the main cable. This invention enables air supply to the duct inside the main cable, ensures a reliable connection with the main bridge structure, adapts to main cable deformation, eliminates installation errors, and ensures accurate installation of the connection device.

Description

Technical Field

[0001] This invention relates to the field of bridge main cable dehumidification technology, specifically to a connection and air supply device for the internal pipes of the main cable and an installation and air supply method. Background Technology

[0002] The main cable of a suspension bridge is a non-replaceable load-bearing component. In actual use, it is difficult to avoid the entry of external moisture, which leads to a high-humidity environment inside the main cable, causing corrosion of the steel wires, thereby reducing its strength and affecting the structural safety and service life of the bridge.

[0003] Currently, the main protective measures primarily involve external sealing with materials such as polysulfide sealant or chlorosulfonated polyethylene wrapping tape, combined with a comprehensive dehumidification system for the main cable. Conventional main cable dehumidification systems prepare dry air, deliver it through pipes along the outside of the main cable to the appropriate locations, and then force the air into the main cable through air inlet clamps installed on the cable surface. The airflow within the main cable carries away internal moisture, which is then expelled through exhaust clamps. However, this external air supply method has drawbacks, including inability to achieve complete gas coverage within the main cable, pipe vibration due to wind causing fatigue damage to components, and insufficient pipe lifespan. Therefore, a new main cable dehumidification system proposes using metal air supply pipes placed directly inside the main cable to directly introduce dry air for dehumidification, and expelling moisture through exhaust clamps installed at appropriate locations on the main cable. This provides a solution for main cable corrosion protection, eliminating the aforementioned drawbacks.

[0004] In practical applications, after the gas delivery pipes inside the main cable are installed, they will be tightly wrapped by a large number of main cable steel wires. The dry air preparation equipment is located outside the main cable. To enable gas to pass through these numerous steel wires and be delivered from the external pipes to the internal pipes, a dedicated pipe connection device is required. Simultaneously, the structure of this device must ensure effective pipe connection and gas delivery, guarantee effective fixation to the bridge's main structure, possess effective airtightness and strength, and be able to accommodate main cable deformation. Currently, conventional pipe connection devices cannot meet the requirements of this scenario. Summary of the Invention

[0005] The purpose of this invention is to provide a connection and air supply device for the internal pipes of the main cable and an installation and air supply method, so as to solve the problem that there is currently no connection device to connect the internal pipes of the main cable and the external air supply device.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0007] In a first aspect, the present invention discloses a connection and air supply device for the internal pipe of the main cable, including a fixed connection strand, a strand anchor head, an adjustment device, an air chamber, and a hollow spiral joint for communicating with the pipe inside the main cable.

[0008] The fixed connecting strand is installed inside the saddle, and the fixed connecting strand extending out of the saddle portion is connected to the strand anchor head. The strand anchor head is connected to the closed end of the air cavity through a length-adjustable adjustment device, and the open end of the air cavity is connected to the hollow spiral joint.

[0009] The air chamber is connected to an air source via a branch air pipe, so that the gas in the air source flows from the open end of the hollow spiral joint into the pipe inside the main cable.

[0010] Furthermore, the conduit inside the main cable is located at the central axis of the main cable;

[0011] The fixed connecting strand is installed at the center of the saddle to fit the conduit inside the main cable.

[0012] Furthermore, one end of the cable anchor head is provided with a receiving space for connecting and fixing the cable strands, and the other end is provided with a connecting end coaxial with the receiving space;

[0013] The fixed connecting strand extending from the saddle portion is connected within the receiving space of the strand anchor head, and one end of the adjusting device is threadedly connected to the connecting end of the strand anchor head.

[0014] Furthermore, the adjusting device is a double-ended adjusting bolt, one end of which is threaded into the connecting end of the cable strand anchor head, and the other end is threaded into the closed end of the air cavity;

[0015] The double-headed adjusting bolt is also equipped with a nut, which is rotated to adjust the distance between the air chamber and the cable anchor head.

[0016] Furthermore, the closed end and the open end of the air cavity are coaxially arranged, and a coaxial cavity is provided between the closed end and the open end of the air cavity, and the cavity is connected to the open end.

[0017] Furthermore, the cavity and the branch trachea are threadedly connected, and the branch trachea is perpendicular to the cavity.

[0018] Furthermore, a gas distribution box with a pressure relief protection device is detachably connected between the branch gas pipe and the gas source.

[0019] Furthermore, the strand anchor head is cylindrical, and the axes of the strand anchor head, double-ended adjusting bolt, air cavity, and hollow spiral joint coincide with the axis of the pipe inside the main cable.

[0020] Secondly, the present invention discloses an installation and air supply method for connecting an air supply device according to any one of the first aspects, comprising the following steps:

[0021] Step 10: Install the fixed connecting cable strand with cable strand anchor heads at both ends at the center of the cable saddle, and make the cable strand anchor heads extend out of the cable saddle;

[0022] Step 20: Connect the hollow spiral joint to the pipe inside the main cable on one side of the cable saddle, and connect the open end of the air cavity to the hollow spiral joint;

[0023] Step 30: Vertically connect the air chamber and the air distribution box to the external air source through the branch air tube;

[0024] Step 40: Connect the cable strand anchor head and the air chamber using the double-headed adjusting bolts, and adjust the double-headed adjusting bolts to the preset installation length to complete the installation of the air supply device on one side of the cable saddle.

[0025] Step 50: Repeat steps 20 to 40 to complete the installation of the air supply device on the other side of the cable saddle;

[0026] Step 60: Pull and install the remaining conventional cable strands until the main cable strands are installed;

[0027] Step 70: Start the gas source so that the gas generated by the gas source passes through the gas distribution box, branch gas pipe, gas chamber and hollow spiral joint in sequence and enters the pipe inside the main cable.

[0028] Furthermore, prior to step 10, the following is also included:

[0029] Step 2: Pull and install conventional cable strands from the bottom layer until the cable saddle is in the center position;

[0030] Step 4: Install the gas supply pipe at the center axis of the main cable.

[0031] According to the above technical solution, the beneficial effects of the present invention are as follows:

[0032] The air chamber in this application is connected to the air source via a branch air pipe, and the open end of the air chamber is connected to the hollow spiral joint. The hollow spiral joint is connected to the pipe inside the main cable, which can deliver external gas to the pipe inside the main cable. The hollow spiral joint of this application is connected to the fixed connecting strand of the cable extending from the saddle part through an intermediate connector. This design ensures that the hollow spiral joint is located at the end of the pipe inside the main cable, which can ensure that the branch air pipe on the air chamber can be smoothly led out to the outside of the main cable, thus solving the problem of not being able to deliver gas to the pipe inside the main cable.

[0033] This application designs a fixed connecting cable strand connected to the cable saddle, and the fixed connecting cable strand extending out of the cable saddle part is sequentially connected to the cable strand anchor head, adjustment device, air cavity, hollow spiral joint and pipe inside the main cable. When the main cable deforms, the fixed connecting cable strand connected to the cable saddle can deform together with the main cable, ensuring a reliable connection with the main structure of the bridge.

[0034] This application designs an adjustable length adjustment device to connect the cable strand anchor head and the air chamber. The distance between the two can be adjusted by the adjustment device, which realizes the adjustment of the overall length of the connection device, can eliminate installation errors, can adapt to the deformation of the main cable, and ensure the accuracy of the installation position of the connection device. Attached Figure Description

[0035] Figure 1 This is an installation effect diagram of the connecting device of the present invention;

[0036] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0037] Figure 3 This is a side view of the connecting device;

[0038] Figure 4 A top view of the connecting device without the air distribution box;

[0039] Figure 5 This is a top view of the entire connecting device;

[0040] Figure 6 This is a schematic diagram of an air cavity;

[0041] Figure 7 This is a schematic diagram of the arrangement of the fixed connecting cables in this application.

[0042] The components include: 1. Fixed connecting cable strands; 2. Cable strand anchor heads; 3. Double-headed adjusting bolts; 4. Air chambers; 5. Branch air pipes; 6. Air distribution boxes; and 7. Hollow spiral joints. Implementation

[0043] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0044] It should be noted that in the description of this invention, the terms "front," "rear," "left," "right," "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "front," "rear," "left," "right," "upper," and "lower" used in the description of this invention refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0045] This invention proposes a connection and gas supply device for the internal pipeline of the main cable and a method for its installation. The aim is to solve the connection and gas supply problems between the external and internal gas supply pipelines of the main cable. Fixed connecting strands are installed within the saddle groove of the bridge cable saddle to reliably fix the connection device and provide length adjustment to accommodate main cable deformation and pipeline installation errors. This invention is versatile, includes pressure relief protection, and can be adapted to the connection needs of gas supply pipelines between the external and internal main cables of most suspension bridges by adjusting the processing dimensions.

[0046] Analysis shows that the current protection of the main cable is achieved through a combination of external sealing and a dehumidification system. However, the current dehumidification system generates dry air, transports it through pipes along the outside of the main cable to the appropriate location, and then forces the air into the cable through air inlet clamps installed on the cable surface. This method has several drawbacks.

[0047] Currently, some studies have proposed a scheme of arranging pipes inside the main cable for dehumidification. However, these studies only analyze the feasibility of arranging pipes inside the main cable for dehumidification. They do not analyze how to ensure the stable connection of the pipes or how to connect the pipes to an external air source. The connection device designed in this application can ensure the effective connection of the pipes and gas delivery, ensure effective fixation to the main bridge structure, and has effective airtightness and strength, and can adapt to the deformation of the main cable. Example

[0048] like Figures 1 to 7 As shown, this application provides a connection and air supply device for an internal pipeline of a main cable, comprising a pipeline inside the main cable and an air source outside the main cable. The connection device includes a fixed connecting strand 1, a strand anchor head 2, an adjustment device, an air chamber 4, and a hollow spiral joint 7 for communicating with the pipeline inside the main cable. The fixed connecting strand 1 is connected to the saddle, and the fixed connecting strand 1 extending out of the saddle portion is connected to the strand anchor head 2. The strand anchor head 2 is connected to the closed end of the air chamber 4 through an adjustable length adjustment device, and the open end of the air chamber 4 is connected to the hollow spiral joint 7. The air chamber 4 is connected to the air source through a branch air pipe 5, so that the gas in the air source flows from the open end of the hollow spiral joint 7 into the pipeline inside the main cable.

[0049] The air chamber of this application is connected to the air source via a branch air pipe, and the open end of the air chamber is connected to the hollow spiral joint. The hollow spiral joint is connected to the pipe inside the main cable, which can deliver external gas to the pipe inside the main cable. The hollow spiral joint of this application is connected to the fixed connecting strand of the cable extending from the saddle part through an intermediate connector. This design ensures that the hollow spiral joint is located at the end of the pipe inside the main cable, which can ensure that the branch air pipe on the air chamber can be smoothly led out to the outside of the main cable, thus solving the problem of not being able to deliver gas to the pipe inside the main cable.

[0050] This application designs a fixed connecting strand that connects to the cable saddle, and the fixed connecting strand extending from the cable saddle section sequentially connects to the cable strand anchor head, adjustment device, air chamber, hollow spiral joint and pipe inside the main cable. When the main cable deforms, the fixed connecting strand connected to the cable saddle can deform together with the main cable, ensuring a reliable connection with the main structure of the bridge and adapting to the deformation of the main cable.

[0051] This application designs an adjustable length adjustment device to connect the cable strand anchor head and the air chamber. The distance between the two can be adjusted by the adjustment device, which realizes the adjustment of the overall length of the connection device, can eliminate installation errors, and ensure the accuracy of the installation position of the connection device.

[0052] The following section describes this application in conjunction with specific solutions.

[0053] The connecting device provided in this application mainly includes a fixed connecting strand 1, a strand anchor head 2, an adjusting device, an air chamber 4, and a hollow spiral joint 7. The fixed connecting strand 1 is installed on the cable saddle. Furthermore, the fixed connecting strand 1 is located at the center of the cable saddle to accommodate the pipe at the central axis of the main cable. The fixed connecting strand 1 uses steel wire of the same material as the main cable. The main body length of the fixed connecting strand 1 is the same as the length of the main cable saddle. The steel wire of the central extended portion of the fixed connecting strand 1 is located outside the cable saddle and is used to connect with the strand anchor head 2.

[0054] like Figure 7 As shown, since many cable strands are distributed within the cable saddle, the remaining conventional cable strands will compress the fixed connecting cable strand 1 located at the center of the cable saddle. A significant force can be generated between the conventional cable strands and the fixed connecting cable strand 1, preventing the fixed connecting cable strand 1 from shifting position and ensuring its stability within the cable saddle. The stable fixed connecting cable strand 1 is used to sequentially connect the cable strand anchor head 2, the adjusting device, the air chamber 4, the hollow spiral joint 7, and the duct within the main cable, ensuring the stable connection of the duct within the main cable.

[0055] Since the fixed connection strand 1 designed in this application is connected to the pipe inside the main cable through the strand anchor head 2, adjustment device, air chamber 4, and hollow spiral joint 7 on both sides, it can not only fix the internal ventilation pipe, but also balance the influence of the tension of the strand pipe in the middle span and the side span.

[0056] In this application, the duct inside the main cable is arranged at the central axis of the main cable. This design minimizes the stress on the duct, preventing the conventional strands from exerting significant compressive force on it, thus ensuring the duct's service life and air delivery efficiency. The fixed connecting strand is installed at the center of the saddle, not only to accommodate the duct inside the main cable but also to ensure the stability of the duct connection (due to the non-circular structure of the saddle, the two conventional strands above and below exert a significant force on the central fixed connecting strand, ensuring the connection stability of the fixed connecting strand).

[0057] In some further embodiments, the connecting strand 1, strand anchor head 2, adjusting device, air cavity 4 and hollow spiral joint 7 are all made of the same steel material as the main cable wire to ensure that the connecting device as a whole has sufficient connection strength and tensile strength, and to prevent damage to the connecting device when the main cable deforms.

[0058] In some further embodiments, one end of the strand anchor head 2 is connected to the filling strand 1, and the other end is connected to the adjusting device. Specifically, such as... Figures 3 to 5 As shown, the left end of the cable anchor head 2 has a receiving space for connecting the fixed connecting cable strand 1, and the right end has a connecting end coaxial with the receiving space. The fixed connecting cable strand 1, extending from the cable saddle portion, is connected within the receiving space of the cable anchor head 2 to ensure the stability of the connection between the fixed connecting cable strand 1 and the cable anchor head 2. The connection method can be alloy casting or crimping.

[0059] The right end of the cable anchor head 2 has an internal thread. In some further embodiments, the adjustment device adopts a double-ended adjusting bolt 3 design. A hexagonal bolt is pre-installed in the middle of the double-ended adjusting bolt 3 to secure the nut. The threads on the left and right sides of the bolt have opposite directions of rotation, and the thread length on the bolt can be adjusted automatically according to the designed adjustment length. The left end of the double-ended adjusting bolt 3 is threaded into the right end of the cable anchor head 2, and the right end is connected to the air chamber 4. The distance between the cable anchor head 2 and the air chamber 4 can be adjusted by rotating the securing nut.

[0060] The double-ended adjusting bolt 3 requires an adjustment length of 10cm. Specifically, the double-ended adjusting bolt is designed to be 22cm long, with the nut being 2cm long and the adjusting bolt itself being 20cm, resulting in an adjustment length of 10cm. Considering the main cable elongation deformation rate of 0.4% and the installation control error of 1~2cm, the adjustment length can well accommodate the deformation and error of the main cable.

[0061] In some further embodiments, the air chamber 4 is rectangular in shape and has a circular hollow cavity. The left end of the air chamber 4 is a closed end, and the right end is an open end. The closed end is threadedly connected to the double-ended adjusting bolt 3, and the open end is connected to the hollow spiral connector 7. The open end and the closed end are coaxially arranged, and a coaxial circular cavity 40 is also provided between the open end and the closed end, which is connected to the open end. The open end is connected to an external air source through a branch air pipe 5. In this application, the cavity 40 is used to introduce the external air source into the main cable, which can prevent the external air source from directly flowing into the pipeline inside the main cable and causing the pipeline to impact the pipeline, thus ensuring the stability of the pipeline inside the main cable. In this application, when the rectangular air chamber is connected to the branch air pipe 5, it can be ensured that the branch air pipe 5 is vertically connected between the air chamber 4 and the external air source. The purpose of using a vertical connection of the branch air pipe is to ensure that the branch air pipe 5 can be led out to the outside of the main cable.

[0062] In some further embodiments, the hollow spiral joint 7 is a custom-made pipe with an external thread on the left end, which is connected to the air chamber 4, and a spiral external thread on the right end, which is connected to the internal ventilation pipe inside the main cable.

[0063] In this application, the specific dimensions of the thread can be adjusted according to the dimensions of the internal ventilation pipe to accommodate suspension bridges of different sizes.

[0064] In some embodiments, the strand anchor head 2 and the air cavity 4 are both cylindrical. The axes of the strand anchor head 2, the double-ended adjusting bolt 3, the air cavity 4 and the hollow spiral joint 7 coincide with the axis of the pipe inside the main cable, so that the entire connection device and the axis of the pipe inside the main cable coincide. This ensures the connection stability of the pipe and adapts to the deformation of the main cable.

[0065] To allow external gas to enter, a coaxial cavity 40 is provided between the closed and open ends of the gas chamber, and the cavity 40 is connected to the open end. Multiple holes are reserved on the side wall of the cavity 40, which are connected to the branch gas supply pipe 5 leading to the outside of the cable. This allows the cavity to receive high-pressure, high-velocity gas from outside the main cable, and after static pressure is applied inside the cavity 40, the gas flows out along the open end.

[0066] Branch air pipe 5 is a custom-made pipe with a threaded end that connects to multiple pre-drilled holes on the side wall of cavity 40, and a threaded end that connects to an air source outside the main cable. Furthermore, the length and diameter of branch air pipe 5 are adjusted according to the scale of the main cable so that the working space of the branch air pipe can meet the internal space requirements of the main cable.

[0067] The specifications and quantity of the threaded joints reserved on the 40 sidewall of the cavity can be adjusted according to the thickness of the cable saddle diaphragm, which not only meets the requirements of the internal deformation of the main cable, but also increases the diameter of the ventilation pipe.

[0068] In some further embodiments, a distribution box 6 is also provided between the branch air pipe 5 and the air source. The distribution box 6 is a custom-made pipe with a threaded end that connects to an external pipe to receive dry air compressed by the fan. Multiple threaded connectors are provided at the bottom for connection to the branch air pipe 5. The distribution box 6 can provide a standard connector for connection to the fan pipe, and a custom-made threaded connector at the bottom for connection to the branch air pipe 5. The distribution box is also equipped with an automatic pressure relief protection device with adjustable pressure relief.

[0069] When the pressure exceeds the pressure relief setting value, the pressure relief protection device is activated, and the gas is discharged from the pressure relief device and no longer enters the branch gas pipe. When the pressure is less than the pressure relief setting value, the gas enters the branch gas pipe. The pressure relief setting value can be 1-2 MPa.

[0070] The workflow of this patent is as follows: When using this device, install and fix each component from both ends towards the middle. The fixed connecting cable strand 1 and the cable strand anchor head 2 form an anchoring section. First, install the anchoring section in the saddle groove of the main cable. Then, connect the hollow spiral joint 7 to the internal ventilation pipe. The branch air pipe 5 is connected to the air distribution box 6 and connected to the air chamber 4, ensuring that the reserved air distribution joint in the air chamber 4 is vertically upward. Finally, connect the fixed connecting cable strand 1 and the cable strand anchor head 2 through the double-headed adjusting screw of the component. At the same time, adjust the installation length of the double-headed adjusting screw 3 according to the site conditions. Multiple reserved air distribution joints reduce the resistance along the air delivery path while ensuring a large flow rate. When the gas enters the air chamber 4 through the air distribution box 6 and the branch air pipe 5, the air chamber 4 performs pressure balancing buffering on the incoming air again, ensuring that it can be smoothly delivered into the pipe.

[0071] The above-described design achieves the following effects: The fixed connection between the cable strand 1 and the cable strand anchor head 2 ensures a reliable connection between the connecting device and the bridge cable saddle. The double-ended adjusting bolt 3 allows adjustment of the overall length of the device without affecting its airtightness or structural strength. The air distribution box 6 automatically balances other pressures within the main air-supplying cable, providing pressure protection for the pipeline. All components utilize threaded connections, avoiding the shortcomings of insufficient toughness in welded joints, and ensuring structural strength meets the long-term vibration and expansion / contraction requirements of the main cable. The branch air pipe 5 allows for flexible allocation of the number and specifications of pre-reserved joints according to the gaps in the main cable, making it suitable for suspension bridges of different scales.

[0072] Based on the main cable dehumidification and air supply requirements, the air supply pressure is set to ≤10000pa and the air supply flow rate to ≤180m³ / h. Using the resistance calculation formula, the connection and ventilation device provided in this application was tested. When the upper limit of the pressure is used for air supply, the device generates a resistance loss of approximately <100Pa. Calculations show that the resistance loss is less than 1% of the fan head, proving that the connection and ventilation device provided in this application can achieve good ventilation performance. The formula for calculating the resistance of gas flow in the pipeline is: R = (λ / D) * (ν) 2*γ / 2g), where ν - flow velocity (m / s); λ - drag coefficient; γ - density (kg / m3); D - pipe diameter (m); P - pressure (kgf / m2); R - frictional resistance (kgf / m2); L - pipe length (m); g - gravitational acceleration.

[0073] In suspension bridges, the cable saddle structure is as follows: Figure 1 As shown, the fixed connecting strand 1 is located at the center of the cable saddle, and both ends of the fixed connecting strand 1 extend beyond the outside of the cable saddle. The conduit is located inside the main cable and is disconnected at the cable saddle, so that the conduit inside the main cable is distributed on both sides of the cable saddle.

[0074] An external air supply pipe 01 is installed on the cable saddle. One end of the external air supply pipe 01 is connected to an external air source, and the other end is connected to the air distribution box 6 in the connecting device.

[0075] The exposed fixed connecting strands 1 at both ends of the cable saddle are all connected to the strand anchor heads 2. The connection of the pipes is achieved by designing connection devices at both ends of the pipes inside the main cable, which ensures the stability of the pipe connection inside the main cable. Example

[0076] In practical applications, a conventional main cable strand is formed by combining multiple strands according to rules and undergoing processes such as extrusion and wire winding to create a single main cable. This cable spans from the anchorage, crossing the main cable saddle located at the top of the bridge tower to the anchorage on the opposite bank. The multiple strands that make up the main cable are pressed into corresponding saddle grooves at the saddle according to rules. Inside the saddle grooves, the multiple strands are subjected to enormous pressure and friction, preventing relative slippage between the main cable and the saddle, thus forming an effective fixation.

[0077] The proposed solution for internal cable air supply was to replace one of the cable strands with a gas delivery pipe. However, this pipe could not withstand the enormous pressure generated by the compression of other cable strands at the main cable saddle, while also ensuring the effective connection of the gas delivery pipes spanning both sides of the main cable saddle. Therefore, the design proposed a solution to disconnect the gas delivery pipe at the main cable saddle at the top of the tower. However, this solution prevented the gas delivery pipe from being effectively fixed like the other cable strands, causing relative slippage. This, in turn, led to serious problems such as main cable deformation, inability to deliver air for dehumidification, and high-pressure gas leakage damaging the outer seal of the main cable, thus affecting the structural safety of the bridge.

[0078] Meanwhile, after the gas delivery pipes inside the main cable are installed, they will be tightly compressed and wrapped around a large number of main cable strands. However, the dry air preparation equipment is located outside the main cable. It is extremely difficult to achieve gas delivery from the external pipes to the internal gas delivery pipes through a large number of strands to realize gas delivery inside the cable.

[0079] This embodiment, based on Embodiment 1, provides a method for installing and supplying gas via a connecting gas supply device. The gas supply pipelines are disconnected on both sides of the main cable saddle at the top of the tower, with the pipelines distributed along both sides of the saddle. Fixed connecting strands are pressed into the saddle grooves. A connecting device is used to connect and fix the gas supply pipelines on both sides of the main cable saddle to the fixed connecting strands. Two branch gas supply pipelines are connected to the gas supply pipelines on both sides. Gas supply can be achieved after installation via the connecting device. Implementing this method requires a dedicated connecting device, as provided in Embodiment 1, installed at the cable saddle at the top of the tower. The structure of this device ensures effective connection and fixation of the pipelines and gas delivery, as well as effective fixation to the main bridge structure. It also possesses effective airtightness and strength, and can adapt to the deformation of the main cable.

[0080] This method includes the following steps:

[0081] Step 2: Pull and install conventional cable strands from the bottom layer until the cable saddle is in the center position.

[0082] Step 4: Install the gas supply pipe at the center axis of the main cable.

[0083] Step 10: Install the fixed connecting cable with cable anchor heads at both ends at the center of the cable saddle, and make the cable anchor heads extend out of the cable saddle.

[0084] Step 20: Connect the hollow spiral joint to the pipe inside the main cable on one side of the cable saddle, and connect the open end of the air cavity to the hollow spiral joint.

[0085] Step 30: Vertically connect the air chamber and the air distribution box to the external air source through the branch air tube.

[0086] Step 40: Connect the cable strand anchor head and the air chamber using the double-headed adjusting bolts, and adjust the double-headed adjusting bolts to the preset installation length to complete the installation of the air supply device on one side of the cable saddle.

[0087] Step 50: Repeat steps 20 to 40 to complete the installation of the air supply device on the other side of the cable saddle.

[0088] Step 60: Pull and install the remaining conventional cable strands until the main cable strands are installed.

[0089] Step 70: Start the gas source so that the gas generated by the gas source passes through the gas distribution box, branch gas pipe, gas chamber and hollow spiral joint in sequence and enters the pipe inside the main cable.

[0090] The workflow of this patent is as follows: After the cable strands are installed below the air supply pipe inside the cable, this method and device are used to complete the installation and fixation of the air supply pipe inside the cable. When using this method and device, each component is installed and fixed from the middle outwards to both ends.

[0091] First, the fixed connecting cable strand 1 and cable strand anchor head 2 are integrated to form an anchoring section; second, the hollow spiral joint 7 is connected to the internal ventilation pipe; the branch air pipe 5 is connected to the air distribution box 6, and the air chamber is also connected, with the air distribution joint reserved vertically upward in the air chamber; finally, the cable strand anchor head 2 and air chamber 4 are connected by the double-headed adjusting bolt 3, and the installation length of the double-headed adjusting bolt 3 is adjusted according to the site conditions.

[0092] Multiple pre-reserved gas distribution joints reduce the resistance along the gas delivery path while ensuring a large flow rate. When the gas enters the gas chamber 4 through the gas distribution box 6 and the branch gas pipe 5, the gas chamber 4 performs pressure balancing buffering on the incoming air again, so that it meets the requirement of being smoothly delivered into the pipe.

[0093] The air supply pipes on both sides of the main cable saddle are connected and fixed using the methods and devices described above, which effectively balances the tension of the pipes on both sides. After all installations are completed, the cable strands above the pipes are then installed. Ultimately, the main cable saddle, fixed connecting cable strands, connecting and gas supply devices, and main cable form a unified whole.

[0094] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A connection and air supply device for an internal pipe of a main cable, characterized in that, It includes a fixed connecting strand (1), a strand anchor head (2), an adjustment device, an air chamber (4), and a hollow spiral joint (7) for connecting to the pipe inside the main cable. The fixed connecting strand (1) is installed inside the saddle, and the fixed connecting strand (1) extending out of the saddle portion is connected to the strand anchor head (2). The strand anchor head (2) is connected to the closed end of the air cavity (4) through an adjustable length adjustment device. The open end of the air cavity (4) is connected to the hollow spiral joint (7). The air chamber (4) is connected to the air source via a branch air pipe (5), so that the gas in the air source flows from the open end of the hollow spiral joint (7) into the pipe inside the main cable; The conduit inside the main cable is located at the central axis of the main cable; The fixed connecting strand (1) is installed at the center of the saddle to fit the conduit inside the main cable; One end of the cable anchor head (2) is provided with a receiving space for connecting and fixing the cable strand (1), and the other end is provided with a connecting end coaxial with the receiving space; The fixed connecting strand (1) extending from the saddle portion is connected within the receiving space of the strand anchor head (2); The closed end and the open end of the air cavity (4) are coaxially arranged, and a coaxial cavity (40) is also provided between the closed end and the open end of the air cavity, and the cavity (40) is connected to the open end; The branch trachea (5) and the cavity (40) are perpendicular; The adjusting device is a double-headed adjusting bolt (3); The strand anchor head (2) is cylindrical, and the axes of the strand anchor head (2), double-headed adjusting bolt (3), air cavity (4) and hollow spiral joint (7) coincide with the axis of the pipe inside the main cable.

2. The air supply device for connecting the internal pipes of the main cable according to claim 1, characterized in that, One end of the adjustment device is threadedly connected to the connecting end of the cable anchor head (2).

3. The air supply device for connecting the internal pipes of the main cable according to claim 1, characterized in that, One end of the double-headed adjusting bolt (3) is threaded into the connecting end of the cable anchor head (2), and the other end is threaded into the closed end of the air cavity (4); The double-headed adjusting bolt (3) is also provided with a nut, which is rotated to adjust the distance between the air chamber (4) and the cable anchor head (2).

4. The air supply device for connecting the internal pipes of the main cable according to claim 1, characterized in that, The cavity (40) and the branch trachea (5) are threaded together.

5. The air supply device for connecting the internal pipes of the main cable according to claim 1, characterized in that, A gas distribution box (6) with a pressure relief protection device is detachably connected between the branch gas pipe (5) and the gas source.

6. A method for installing and supplying air to a connected air supply device according to any one of claims 1-5, characterized in that, Includes the following steps: Step 10: Install the fixed connecting strand (1) with strand anchor heads (2) at both ends at the center of the saddle, and make the strand anchor heads (2) extend out of the saddle; Step 20: Connect the hollow spiral joint (7) to the pipe inside the main cable on one side of the cable saddle, and connect the open end of the air cavity (4) to the hollow spiral joint (7); Step 30: Vertically connect the air chamber (4) and the air distribution box (6) connected to the external air source through the branch air pipe (5); Step 40: Connect the cable strand anchor head (2) and the air chamber (4) with the double-headed adjusting bolt (3), and adjust the double-headed adjusting bolt (3) to the preset installation length to complete the installation of the air supply device on one side of the cable saddle; Step 50: Repeat steps 20 to 40 to complete the installation of the air supply device on the other side of the cable saddle; Step 60: Pull and install the remaining conventional cable strands until the main cable strands are installed; Step 70: Start the gas source so that the gas generated by the gas source passes through the gas distribution box (6), branch gas pipe (5), gas chamber (4) and hollow spiral joint (7) in sequence and enters the pipe inside the main cable.

7. An installation and gas supply method according to claim 6, characterized in that, The steps preceding step 10 also include: Step 2: Pull and install conventional cable strands from the bottom layer until the cable saddle is in the center position; Step 4: Install the gas supply pipe at the center axis of the main cable.

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