Suspension bridge main cable ventilation pipe installation structure

Abstract

The utility model provides a kind of suspension bridge main cable ventilation pipeline mounting structure, including ventilation pipeline subsection and the cable strand that has been erected around ventilation pipeline subsection lower, the both ends of ventilation pipeline subsection are provided with the spiral segment for being connected with each other, the outside of each cable strand is wound with the wrapping tape for being wound with ventilation pipeline subsection, the outer diameter of spiral segment is less than the outer diameter of ventilation pipeline subsection, and its connection with ventilation pipeline subsection is provided with the limiting ring that is tangent to and fits with surrounding cable strand. By setting wrapping tape on the multiple cable strands below ventilation pipeline subsection, and cooperating with the limiting ring that is tangent to and fits with cable strand, accurate positioning and stable support of ventilation pipeline are realized, effectively preventing deviation or torsion during installation and use process;Limiting ring inscribed circle is consistent with ventilation pipeline outer diameter, to ensure that structure adaptation precision.

Description

Technical Field

[0001] This utility model relates to the field of ventilation of main cables of suspension bridges, and in particular to an installation structure for ventilation ducts of main cables of suspension bridges. Background Technology

[0002] With the rapid development of science and technology, bridge construction technology has made significant progress, resulting in a proliferation of long-span bridges spanning inland rivers and canyons. Among the many bridge types, suspension bridges have gained widespread application in recent years due to their superior structural performance and high cost-effectiveness. As the "lifeline" of a suspension bridge, the ventilation and dehumidification effect of the main cable directly affects the bridge's service life. Currently, the ventilation and dehumidification system for the main cable of suspension bridges has begun to adopt an in-cable air supply method, that is, installing a ventilation duct in the center of the main cable to force dry air into the cable from the inside out. The ventilation duct is generally long in section and has a high degree of structural flexibility. Within the main cable, it is easily affected by the torsion and displacement of the main cable, causing it to deviate from its design position, or even fall between the lower main cables. Therefore, it is necessary to combine the deformation characteristics of the main cable and the physical properties of the central ventilation duct to develop a simple, efficient, and economical construction method to improve the positioning quality of the central ventilation duct of the main cable. Utility Model Content

[0003] The main purpose of this utility model is to provide an installation structure for the ventilation duct of the main cable of a suspension bridge, which solves the problem that the ventilation duct is long and flexible, and is easily affected by the torsion and displacement of the main cable, causing it to deviate from its designed position or even fall between the lower main cables.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a ventilation duct installation structure for the main cable of a suspension bridge, including ventilation duct segments and pre-erected cable strands located around the ventilation duct segments. Both ends of the ventilation duct segments are provided with spiral segments for connecting with each other. Each cable strand is wrapped with wrapping tape for wrapping with the ventilation duct segments. The outer diameter of the spiral segment is smaller than the outer diameter of the ventilation duct segment, and a limiting ring that is tangentially fitted to the surrounding cable strands is provided at the connection between the spiral segment and the ventilation duct segment.

[0005] In the preferred embodiment, the cable strands are the three cable strands directly below the ventilation duct segment and the three cable strands on the adjacent sides below.

[0006] In the preferred embodiment, the inner circle of the limiting ring is the same as the outer diameter of the ventilation duct segment.

[0007] In the preferred embodiment, the limiting ring has a hexagonal structure.

[0008] In the preferred embodiment, a rubber sleeve is provided on the outer side of the limiting ring.

[0009] In the preferred embodiment, one spiral segment of the ventilation duct is provided with a plug-in end with an outer diameter smaller than that of the segment, and the other spiral segment is provided with a plug-in groove that mates with the plug-in end.

[0010] In the preferred embodiment, sealing rings are provided at the two steps where the plug end and the plug groove abut against each other.

[0011] In the preferred embodiment, multiple anti-disengagement one-way locking structures are provided between the plug end and the plug slot; The anti-disengagement one-way locking structure includes a ratchet and a pawl that are respectively built into the contact surface of the plug end and the plug groove and cooperate with each other; The pawl includes a telescopic hole on the contact surface, and limit grooves are provided on both of the two opposing inner walls of the telescopic hole. A pawl body that can cooperate with the ratchet is movably installed at the opening of the telescopic hole. A limit block that matches the limit groove is provided at one end of the pawl body located in the telescopic hole. A telescopic spring that abuts against the pawl body is provided in the telescopic hole.

[0012] In the preferred embodiment, multiple mating blocks and mating grooves are respectively provided on the contact surface between the plug end and the plug groove, and the mating blocks and mating grooves are arranged alternately with the ratchet and pawl.

[0013] In the preferred embodiment, an internally threaded connecting sleeve is also included, which can be screwed between the two mating spiral segments, and the length of one of the spiral segments of the ventilation duct is greater than that of the internally threaded connecting sleeve.

[0014] This utility model provides an installation structure for the ventilation duct of the main cable of a suspension bridge. By setting wrapping tape on multiple strands below the ventilation duct sections and cooperating with limiting rings that fit tangentially with the strands, the ventilation duct is accurately positioned and stably supported, effectively preventing displacement or torsion during installation and use. The inner tangent circle of the limiting ring is consistent with the outer diameter of the ventilation duct, ensuring structural fit accuracy. The outer rubber sleeve can buffer contact stress and protect the strands from damage. A sealing ring is set at the plug-in connection to ensure airtightness. The ratchet and pawl in the anti-loosening one-way locking structure automatically engage after insertion, achieving reliable anti-loosening. The docking block and docking groove provide guiding positioning and improve assembly efficiency. The overall structure is easy to install, reliable in connection, and has good sealing. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a structural diagram of the ventilation duct of this utility model; Figure 2 This is a diagram of the connection structure between the strands and the wrapping in this utility model. Figure 3 This is a flowchart of the segmented installation process for the ventilation duct of this utility model; Figure 4This is a diagram of the connection structure of the cable strand, the limiting ring, and the spiral segment of this utility model; Figure 5 This is a structural diagram of the plug-in end and the spiral segment of this utility model; Figure 6 This is a half-sectional view of the insertion groove and spiral section of this utility model; Figure 7 This is a half-sectional view of the segmented connection structure of the two ventilation ducts of this utility model; Figure 8 This is a utility model Figure 7 Enlarged view of the A-structure.

[0016] In the diagram: ventilation duct section 1; spiral section 2; limiting ring 3; cable strand 4; wrapping tape 5; ratchet 6; pawl 7; telescopic hole 701; limiting groove 702; pawl body 703; limiting block 704; telescopic spring 705; docking block 8; docking groove 9; internal threaded connecting sleeve 10; plug end 11; plug groove 12. Detailed Implementation

[0017] Example 1 like Figure 1-4 As shown, a suspension bridge main cable ventilation duct installation structure includes a ventilation duct segment 1 and pre-erected cable strands 4 located around the ventilation duct segment 1. Both ends of the ventilation duct segment 1 are provided with spiral segments 2 for interconnection. The spiral segments 2 are connected by threaded connecting sleeves 10 with external threads and internal threads 10, which can be screwed between two mating spiral segments 2, thus achieving the connection of adjacent ventilation duct segments 1. The main cable ventilation duct is formed by connecting multiple ventilation duct segments 1, thereby constituting a continuous and interconnected internal ventilation channel for the main cable. The ventilation duct segment 1 includes a stainless steel threaded steel pipe and galvanized aluminum alloy spiral steel wire. The galvanized aluminum alloy spiral steel wire is continuously wound around the stainless steel threaded steel pipe according to a preset pitch. Ventilation holes with unequal spacing and different diameters are opened on the wall of the stainless steel threaded steel pipe to achieve uniform ventilation inside the main cable. This is prior art in the field and therefore will not be described in detail here.

[0018] In this embodiment, the cable strands 4 that have been erected around the ventilation duct segment 1 are specifically: three cable strands 4 directly below the ventilation duct segment 1 and below the adjacent two sides. The three are distributed in a triangle and jointly support the ventilation duct segment 1. The cable strands 4 have a hexagonal cross section.

[0019] To ensure reliable positioning and fixation of the ventilation duct segment 1 within the main cable, each strand 4 is wrapped with wrapping tape 5 for connection with the ventilation duct segment 1, such as... Figure 2As shown, before installing ventilation duct section 1, wrapping tape 5 is wrapped around each strand 4, with both ends reserved at the installation location of ventilation duct section 1. When ventilation duct section 1 is installed, the reserved wrapping tape 5 is used to wrap and tie it to the three strands 4 below, achieving a stable binding and anti-slip fixation. Each strand 4 is wrapped with wrapping tape 5 at corresponding intervals. The wrapping interval of the wrapping tape 5 can be flexibly adjusted according to the actual length of ventilation duct section 1 to ensure the adaptability and reliability of the overall installation, so that it can be bound and fixed according to the length of ventilation duct section 1.

[0020] Furthermore, the outer diameter of the spiral section 2 is smaller than the outer diameter of the ventilation duct section 1, so that after the threaded connection sleeve 10 is fitted, its outer contour is basically flush with the outer surface of the ventilation duct section 1, avoiding the formation of a protruding structure, which helps to reduce subsequent construction interference and improve the overall flatness. In addition, a limiting ring 3 is provided at the connection point with the ventilation duct section 1, which is tangentially fitted with the surrounding strands 4. Specifically, it is located in the connection transition area. The limiting ring 3 has a hexagonal structure, and the inner circle of the limiting ring 3 is the same as the outer diameter of the ventilation duct section 1. After the limiting ring 3 is assembled, its six sides are tangentially fitted with the corresponding sides of the surrounding hexagonal strands 4, forming a stable geometric limiting relationship, which effectively prevents the ventilation duct section 1 from shifting or twisting during installation or use.

[0021] In the preferred embodiment, a rubber sleeve is provided on the outer side of the limiting ring 3. This rubber sleeve can not only buffer the contact stress between the limiting ring 3 and the strand 4, but also protect the surface of the strand, preventing damage to the strand plating or fretting wear caused by direct contact between metal parts. At the same time, it enhances the sealing performance and reduces the impact of environmental factors on the inside of the main cable.

[0022] This design, through the rational design of ventilation duct segmentation, spiral connection structure, limiting ring shape and its spatial matching relationship with cable strands, combined with the pre-binding process of wrapping tape, achieves efficient, stable and reliable installation of the main cable ventilation duct.

[0023] Example 2 Further explanation in conjunction with Example 1, such as Figure 5-8 The structure shown in this embodiment is used to achieve rapid connection and reliable sealing between adjacent ventilation duct segments 1. Specifically, one spiral segment 2 of the ventilation duct segment 1 is provided with a plug end 11 with an outer diameter smaller than its own, and the other spiral segment 2 is provided with a plug groove 12 that mates with the plug end 11. By inserting the plug end 11 of one ventilation duct segment 1 into the plug groove 12 of the adjacent segment, axial alignment and preliminary positioning between the two segments are achieved. This plug-in connection method has the advantages of convenient installation and rapid connection, and is suitable for on-site assembly of the ventilation system inside the main cable in high-altitude working environments.

[0024] To ensure airtightness at the connection, sealing rings are installed at the contact points of the two axial abutment steps of the plug end 11 and the plug groove 12. When the plug is installed, the sealing rings undergo elastic deformation under axial compression, filling the contact gap and effectively preventing gas leakage. This ensures the continuity and sealing performance of the ventilation system inside the main cable. The specific placement of the sealing rings before installation is as follows: Figure 5 and 6 As shown.

[0025] In the preferred embodiment, in order to prevent the two ventilation duct segments 1 from being unable to maintain a tight connection and compress the sealing ring when the threaded connection sleeve 10 locks between the two adjacent ventilation duct segments 1, multiple anti-detachment one-way locking structures are provided between the insertion end 11 and the insertion groove 12. The multiple anti-detachment one-way locking structures are evenly distributed along the circumference to achieve all-round locking.

[0026] The anti-disengagement one-way locking structure includes a ratchet 6 and a pawl 7 that are respectively built into the contact surfaces of the plug end 11 and the plug groove 12 and cooperate with each other.

[0027] The pawl 7 includes a telescopic hole 701 provided on the contact surface. Limiting grooves 702 are provided on both of the two opposing inner walls of the telescopic hole 701. A pawl body 703 that can cooperate with the ratchet 6 is movably provided at the opening of the telescopic hole 701. A limiting block 704 that is adapted to the limiting groove 702 is provided at one end of the pawl body 703 located in the telescopic hole 701. A telescopic spring 705 that abuts against the pawl body 703 is provided in the telescopic hole 701.

[0028] With this design, when the plug end 11 is inserted into the plug slot 12, the ratchet 6 pushes the claw body 703 to overcome the spring force and retract into the telescopic hole 701, thus achieving smooth insertion. Once fully inserted, the telescopic spring 705 drives the claw body 703 to automatically pop out and engage with the ratchet 6, forming a one-way lock to prevent reverse dislodgement.

[0029] To further improve the guidance and connection stability of the insertion process, multiple mating blocks 8 and mating grooves 9 are respectively provided on the contact surfaces of the insertion end 11 and the insertion groove 12. The two form a sliding fit relationship and play a guiding and centering role in the insertion process. The mating blocks 8 and mating grooves 9 are arranged alternately with the ratchet 6 and pawl 7, which not only ensures the smoothness of the insertion process, but also enhances the overall structural rigidity and torsional resistance of the connection.

[0030] In the preferred embodiment, the length of one of the spiral segments 2 of the ventilation duct segment 1 is greater than that of the internal threaded connecting sleeve 10, so that the internal threaded connecting sleeve 10 is located on the spiral segment 2 before connecting the two ventilation duct segments 1.

[0031] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A ventilation duct installation structure for the main cable of a suspension bridge, comprising a ventilation duct segment (1) and pre-erected cable strands (4) located around the ventilation duct segment (1), wherein both ends of the ventilation duct segment (1) are provided with helical segments (2) for interconnection, characterized in that: Each strand (4) is wrapped with a wrapping tape (5) for wrapping with the ventilation duct section (1). The outer diameter of the spiral section (2) is smaller than the outer diameter of the ventilation duct section (1), and a limiting ring (3) is provided at the connection between the spiral section (2) and the ventilation duct section (1) to fit tangentially with the surrounding strands (4).

2. The installation structure for the ventilation duct of the main cable of a suspension bridge according to claim 1, characterized in that: The cable strands (4) are the three cable strands (4) directly below and on the adjacent sides below the ventilation duct segment (1).

3. The installation structure for the ventilation duct of the main cable of a suspension bridge according to claim 1, characterized in that: The inner circle of the limiting ring (3) is the same as the outer diameter of the ventilation duct segment (1).

4. The installation structure for the ventilation duct of the main cable of a suspension bridge according to claim 1 or 3, characterized in that: The limiting ring (3) has a hexagonal structure.

5. The installation structure for the ventilation duct of the main cable of a suspension bridge according to claim 1 or 3, characterized in that: A rubber sleeve is provided on the outside of the limiting ring (3).

6. The installation structure for the ventilation duct of the main cable of a suspension bridge according to claim 1, characterized in that: The ventilation duct is divided into sections (1). One spiral section (2) has a plug end (11) with an outer diameter smaller than its own, and the other spiral section (2) has a plug groove (12) that matches the plug end (11).

7. The installation structure for the main cable ventilation duct of a suspension bridge according to claim 6, characterized in that: A sealing ring is provided at the two steps of the insertion end (11) and the insertion groove (12) where they abut.

8. The installation structure for the ventilation duct of the main cable of a suspension bridge according to claim 7, characterized in that: Multiple anti-disengagement one-way locking structures are provided between the plug end (11) and the plug groove (12); The anti-detachment one-way locking structure includes a ratchet (6) and a pawl (7) that are respectively built into the contact surfaces of the plug end (11) and the plug groove (12) and cooperate with each other. The pawl (7) includes a telescopic hole (701) provided on the contact surface. Limiting grooves (702) are provided on both of the two opposing inner walls of the telescopic hole (701). A pawl body (703) that can cooperate with the ratchet (6) is movably provided at the opening of the telescopic hole (701). A limiting block (704) that is adapted to the limiting groove (702) is provided at one end of the pawl body (703) located in the telescopic hole (701). A telescopic spring (705) that abuts against the pawl body (703) is provided in the telescopic hole (701).

9. The installation structure for the ventilation duct of the main cable of a suspension bridge according to claim 8, characterized in that: Multiple mating blocks (8) and mating grooves (9) are respectively provided on the contact surfaces of the plug end (11) and the plug groove (12). The mating blocks (8) and mating grooves (9) are arranged alternately with the ratchet (6) and the pawl (7).

10. The installation structure for the ventilation duct of the main cable of a suspension bridge according to claim 9, characterized in that: It also includes an internal threaded connecting sleeve (10), which can be screwed between two helical segments (2) that are mated, and the length of one of the helical segments (2) of the ventilation duct segment (1) is greater than that of the internal threaded connecting sleeve (10).

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