A general cross-bracing structure and construction method suitable for inclined pylon construction

Abstract

This invention provides a universal cross bracing structure and construction method suitable for inclined cable tower construction, including a cross bracing body and construction platforms at both ends of the cross bracing body. The cross bracing body includes a standard section and transition sections installed on both sides of the standard section, with non-standard sections at the outer ends of the transition sections. The non-standard sections are hinged to the hinged sections. Both the ends of the non-standard sections and the ends of the transition sections have butt joints. Limiting components are provided on the butt joints of the non-standard sections, and a limiting structure that cooperates with the limiting components is provided on the construction platform, allowing displacement of the non-standard section butt joints only in the horizontal direction, and no displacement in the vertical direction. This invention can adapt to the construction of inclined cable towers at any angle. The cross bracing can provide various length combinations to suit different tower spacing requirements. It is flexible in operation, has few limitations, and the connections between components are convenient, minimizing high-altitude work. Most components are bolted together, making installation and dismantling convenient and construction efficiency high.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, and in particular relates to a universal cross bracing structure and construction method suitable for inclined cable tower construction. Background Technology

[0002] For bridge towers, to meet requirements such as reasonable stress distribution and aesthetic appeal, they are often designed as inclined towers, such as diamond-shaped towers, A-shaped towers, and inverted Y-shaped towers. Currently, the inclination angle of towers in completed and under-construction bridges is approximately 3° to 22°. As the tower columns are raised higher during construction, the cantilever length, with the abutment or lower crossbeam as the fixed point, continuously increases. Under the influence of its own weight, the weight of the climbing formwork (reverse formwork), temperature effects, and wind loads, the horizontal displacement of the cantilevered tower continuously increases, generating tensile stress at the outer edge of the cantilever end. To ensure the structural stress distribution, active temporary cross bracing needs to be installed at certain vertical intervals during tower construction.

[0003] Traditional cross bracing consists of steel pipes. Steel wedges, jacks, and pads are installed at the pipe joints, and the base is anchored to the main tower via a climbing cone. At the other end, the steel pipes need to be cut to fit the tower's inclination angle. After cutting, they need to be welded to the steel plate fixed to the climbing cone. This series of operations involves working at height, especially when the cross bracing is long. To prevent vertical instability, additional vertical supports are needed. The construction process often involves pre-jacking the cross bracing before welding the diagonal bracing to it. This connection method also requires high-altitude welding. After the tower construction is completed, during the removal of the cross bracing, the existing welds need to be burned open with electric welding. The diagonal bracing is removed first, then the cross bracing, and finally the climbing cone and its fixing steel plate are removed. In existing technologies, the fixed angle between the cross brace structure and the embedded parts is unique. The pads and the cut steel pipes cannot be reused in subsequent construction, resulting in poor economic efficiency. Furthermore, the installation and dismantling of the cross brace involves a large amount of high-altitude welding work. The welding of the diagonal brace and the cross brace is an overhead welding, which is difficult, inefficient, and risky. At the same time, the stress of the existing cross brace structure is unclear. During the subsequent segmental climbing formwork and concrete pouring process, the tower will have a certain horizontal displacement. The cross brace and the tower are fixed together, which has weak resistance to deformation. The bending moment generated at the welding position of the diagonal brace and the cross brace is unfavorable to the local stress of the node. Summary of the Invention

[0004] In view of this, the present invention aims to overcome the defects in the prior art and propose a universal cross bracing structure and construction method suitable for inclined cable tower construction.

[0005] To achieve the above objectives, the technical solution created by this invention is implemented as follows:

[0006] A universal cross bracing structure and construction method suitable for inclined cable tower construction includes a cross bracing body and construction platforms at both ends of the cross bracing body. The cross bracing body consists of one or more segments. The cross bracing body includes a standard segment and transition segments installed on both sides of the standard segment. Non-standard segments are provided at the outer ends of the transition segments, and the transition segments and non-standard segments are tightened together by wedges. One end of the non-standard segment, different from the transition segment, is installed on a hinged segment by a pin. The hinged segment and the construction platform are both fixed to the inner side of the cable tower by pre-embedded climbing cones, and the hinged segment is fixed above the construction platform. The ends of the non-standard segments and the transition segments are provided with butt joints. Limiting components are provided on the butt joints of the non-standard segments, and limiting structures that cooperate with the limiting components are provided on the construction platform, so that the butt joints of the non-standard segments are only allowed to have displacement in the horizontal direction, and no displacement in the vertical direction.

[0007] Furthermore, the connector includes an end plate, and a stiffening plate is provided between the end plate and the outer surface of the non-standard section.

[0008] Furthermore, the hinged section is welded and fixed to a steel plate, and the steel plate is fixed to a pre-embedded climbing cone on the cable tower.

[0009] Furthermore, the lower end of the construction platform is provided with a diagonal bracing structure, one end of which is fixed to the bottom of the construction platform and the other end is fixed to the pre-embedded climbing cone on the cable tower.

[0010] Furthermore, a sliding plate is installed on the upper surface of the construction platform, and the joints of the non-standard section and the transition section are all slidably engaged with the sliding plate.

[0011] Furthermore, the construction platform includes a horizontal support structure, on which a steel plate is installed, and a distribution beam is arranged between the steel plate and the horizontal support structure. The sliding plate is installed on the upper side of the steel plate.

[0012] A construction method for a general cross bracing structure applicable to inclined cable tower construction includes the following steps:

[0013] S1. During the construction of the cable tower climbing formwork, a climbing cone is pre-embedded, and then a construction platform is welded onto the pre-embedded climbing cone;

[0014] S2. Lay a sliding plate on the construction platform;

[0015] S3. Install the articulated section, and then install the non-standard section on the articulated section. Use the sliding plate to support the joint of the non-standard section.

[0016] S4. Install the transition section and the standard section in sequence, use the sliding plate to support the joint of the transition section, and install wedges between the joint of the non-standard section and the joint of the transition section.

[0017] S5. Weld and fix the joints of the non-standard section and the transition section on one side. After jacking the joints of the non-standard section and the transition section on the other side, tighten them with wedges. Then weld and fix the joints of the non-standard section and the transition section on that side. Then continue the tower construction.

[0018] S6. After the tower construction is completed, use the jacks to jack the joints of the non-standard section and the transition section on one side, so that a gap appears between the two joints. Then remove the wedges and the jacks.

[0019] S7. Sequentially dismantle the transition section, standard section, and articulated section, and finally dismantle the construction platform.

[0020] Furthermore, the standard section and the transition section are connected by flanges.

[0021] Compared with existing technologies, the present invention has the following advantages:

[0022] The universal cross brace provided by this invention is designed to adapt to the construction of inclined cable towers at any angle because the non-standard section and the hinged section are connected by a pin hinge. The multi-section combined structural design allows the universal cross brace to provide a variety of length combinations to suit different tower spacing requirements. It is flexible in operation, has few limitations, and the connection between each component is convenient, minimizing high-altitude work. Most components are connected by bolts, making installation and dismantling convenient and construction efficiency high. The universal cross brace can be disassembled and reused, saving costs. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A schematic diagram illustrating the application of this invention;

[0025] Figure 2 This is a schematic diagram of the construction platform in this invention;

[0026] Figure 3 This is a schematic diagram of the hinged section in the present invention;

[0027] Figure 4 for Figure 3 The left view;

[0028] Figure 5 This is a schematic diagram illustrating the application of the articulated segment in this invention.

[0029] Figure 6 A schematic diagram of a non-standard segment in the invention;

[0030] Figure 7A schematic diagram of the standard segment in the invention;

[0031] Figure 8 This is a schematic diagram of the connection head and the construction platform in this invention. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] A general cross bracing structure and construction method suitable for inclined cable tower construction, such as Figures 1 to 8As shown, the system includes a cross brace body and construction platforms 1 at both ends of the cross brace body. The cross brace body can be one or more segments. When the cross brace body is a multi-segment structure, the segments are connected by flanges. The cross brace body includes a standard segment 2 and transition segments 3 installed on both sides of the standard segment. Non-standard segments 4 are provided at the outer ends of the transition segments, and the transition segments and non-standard segments are tightened by wedges 5. The end of the non-standard segment that is different from the transition segment is installed on the hinge segment 6 by a pin. For example, the hinge segment is provided with a hinge seat 18, and the non-standard segment is provided with a connecting ear 19 that mates with the hinge seat. The pin passes through the shaft holes of the hinge seat and the connecting ear in sequence to achieve the hinge. The standard segment and the transition segment are connected by flanges, that is, both ends of the standard segment are provided with connecting flanges 7, and the end of the transition segment facing the standard segment is provided with a flange. The flanges of the two are fixed by bolts, which makes installation and disassembly relatively convenient. The cross bracing structure of this invention changes the traditional form of cross bracing being fixed to the tower wall to a hinged connection, reducing high-altitude welding work, improving construction efficiency, allowing for material reuse, and saving costs.

[0037] The construction platform and articulated section are fixed to the tower wall by climbing cones. One end of the non-standard section is connected to the articulated section by a pin, and the other end is welded to the transition section after pre-jacking with jacks. The non-standard section is placed on the construction platform with vertical support from PTFE sliding plates. The flanges between the transition section and the standard section are connected by bolts. After the jacking work is completed, the construction proceeds in reverse order, dismantling the standard section, transition section, non-standard section, articulated section, and construction platform in sequence. Finally, the climbing cones are removed, leaving only holes on the surface of the tower structure for epoxy mortar sealing treatment, followed by concrete coating.

[0038] Both the articulated section and the construction platform are fixed to the inside of the cable tower by pre-embedded climbing cones 8, with the articulated section fixed above the construction platform. In an optional embodiment, the articulated section is welded to a steel plate 9, and the steel plate is fixed to the pre-embedded climbing cone on the cable tower.

[0039] Both the non-standard section and the transition section have a butt joint 10 at their ends. A limiting component 11 is provided on the butt joint of the non-standard section, and a limiting structure that cooperates with the limiting component is provided on the construction platform. This ensures that the butt joint of the non-standard section is only allowed to move horizontally, and not vertically. A sliding plate is installed on the upper surface of the construction platform. The butt joints of the non-standard section and the transition section slide in cooperation with this sliding plate. For example, the sliding plate is made of PTFE material.

[0040] In an optional embodiment, the connector includes an end plate 12, with a stiffening rib 13 provided between the end plate and the outer surface of the non-standard section. The limiting component includes a limiting post, and the limiting structure is a long groove on a steel plate that mates with the limiting post. The length direction of the long groove is the same as the axial direction of the supporting body, and a hollowed-out area is provided on the sliding plate corresponding to the long groove to ensure that the limiting post and the long groove slide together.

[0041] The construction platform is equipped with a diagonal bracing structure 14 at its lower end. One end of the diagonal bracing structure is fixed to the bottom of the construction platform, and the other end is fixed to a pre-embedded climbing cone on the cable tower, which improves the structural strength of the platform and provides more stable and reliable support for the cross bracing body. The construction platform includes a horizontal support structure 15, on which a steel plate 16 is installed. A distribution beam 17 is arranged between the steel plate and the horizontal support structure, and the sliding plate is installed on the upper side of the steel plate.

[0042] The universal cross brace provided by this invention uses a pin-hinged connection between the non-standard section and the hinged section. During the installation and construction of the cross brace, the limiting component cooperates with the limiting structure on the construction platform, so that the cross brace body can only move in the horizontal direction, while the vertical displacement is restricted. Therefore, it can achieve the structural strength and performance of the existing integral cross brace, while also being able to adapt to the construction of inclined cable towers at any angle.

[0043] The standard section of the universal cross brace is available in various specifications, such as cross brace lengths of 12m, 8m, 4m, and 2m. The hinged cross brace section can be up to 3m long. Standard sections are connected by flanges, allowing for rapid on-site construction. Hinged sections and non-standard sections are supported by steel wedges. The universal cross brace offers a wide range of possible length combinations, providing strong adaptability to different length requirements.

[0044] In summary, the cross brace provided by this invention adopts a multi-segment combined structural design, which allows the universal cross brace to provide a variety of length combinations to suit different tower spacing requirements. It is flexible in operation, has few limitations, and the connection between each component is convenient, minimizing high-altitude work. Moreover, most components are connected by bolts, making installation and dismantling convenient and construction efficiency high. The universal cross brace can be disassembled and reused, saving costs.

[0045] A construction method for a universal cross-bracing structure applicable to inclined cable tower construction.

[0046] Includes the following steps:

[0047] S1. During the construction of the cable tower climbing formwork, a climbing cone is pre-embedded, and then a construction platform is welded onto the pre-embedded climbing cone;

[0048] S2. Lay a sliding plate on the construction platform;

[0049] S3. Install the articulated section, and then install the non-standard section on the articulated section. Use the sliding plate to support the joint of the non-standard section.

[0050] S4. Install the transition section and the standard section in sequence, use the sliding plate to support the joint of the transition section, and install wedges between the joint of the non-standard section and the joint of the transition section.

[0051] S5. Weld and fix the joints of the non-standard section and the transition section on one side (the joints of the non-standard section and the transition section can be uniformly connected with wedges), and after applying jacks between the joints of the non-standard section and the transition section on the other side, tighten them with wedges, and then weld and fix the joints of the non-standard section and the transition section on that side (the joints of the non-standard section and the transition section can be uniformly connected with wedges); then continue the tower construction.

[0052] S6. After the tower construction is completed, use the jacks to jack the joints of the non-standard section and the transition section on one side, so that a gap appears between the two joints. Then remove the wedges and the jacks.

[0053] S7. Sequentially dismantle the transition section, standard section, and articulated section, and finally dismantle the construction platform.

[0054] The construction method of this invention can effectively improve material turnover, as the main components are detachable and reusable, reducing material costs. Simultaneously, the structural stress is clearly defined, on-site installation is convenient, high-altitude welding work is reduced, and it is highly adaptable, suitable for cable tower construction at various inclination angles. During cable tower construction, the cable tower experiences lateral displacement due to the structure's own weight, temperature differences between the cross braces and the cable tower, and wind loads. Because the cross brace body of this invention is hinged to the cable tower, it can better accommodate the horizontal displacement of the cable tower. Non-standard sections act on the construction platform through sliding plates. During jacking, the structural force transmission path is clearer, avoiding axial force loss.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A universal cross bracing structure suitable for inclined cable tower construction, characterized in that: Includes the cross brace body and the construction platforms at both ends of the cross brace body; The cross brace body includes a standard section and gradient sections installed on both sides of the standard section. Non-standard sections are provided at the outer ends of the gradient sections, and the gradient sections and non-standard sections are tightened together by wedges. The non-standard section, which differs from the transition section, is installed on the articulated section via a pin. Both the articulated section and the construction platform are fixed to the inside of the cable tower by pre-embedded climbing cones. Both the end of the non-standard section and the end of the transition section are equipped with a joint. A limiting device is provided on the joint of the non-standard section, and a limiting structure that cooperates with the limiting device is provided on the construction platform, so that the joint of the non-standard section is only allowed to have displacement in the horizontal direction, while there is no displacement in the vertical direction.

2. The universal cross bracing structure suitable for inclined cable tower construction according to claim 1, characterized in that: The connector includes an end plate, and a stiffening plate is provided between the end plate and the outer surface of the non-standard section.

3. A universal cross bracing structure suitable for inclined cable tower construction according to claim 1, characterized in that: The hinged section is welded and fixed to the steel plate, and the steel plate is fixed to the pre-embedded climbing cone on the cable tower.

4. A universal cross bracing structure suitable for inclined cable tower construction according to claim 1, characterized in that: The construction platform is equipped with a diagonal bracing structure at its lower end. One end of the diagonal bracing structure is fixed to the bottom of the construction platform, and the other end is fixed to the pre-embedded climbing cone on the cable tower.

5. A universal cross bracing structure suitable for inclined cable tower construction according to claim 1, characterized in that: The construction platform includes a horizontal support structure, on which steel plates are installed, and a distribution beam is arranged between the steel plates and the horizontal support structure.

6. A construction method applicable to the universal cross bracing structure according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1. During the construction of the cable tower climbing formwork, a climbing cone is pre-embedded, and then a construction platform is welded onto the pre-embedded climbing cone; S2. Lay a sliding plate on the construction platform; S3. Install the articulated section, and then install the non-standard section on the articulated section. Use the sliding plate to support the joint of the non-standard section. S4. Install the transition section and the standard section in sequence, use the sliding plate to support the joint of the transition section, and install wedges between the joint of the non-standard section and the joint of the transition section. S5. Weld and fix the joints of the non-standard section and the transition section on one side. After jacking the joints of the non-standard section and the transition section on the other side, tighten them with wedges. Then weld and fix the joints of the non-standard section and the transition section on that side. Then continue the tower construction. S6. After the tower construction is completed, use the jacks to jack the joints of the non-standard section and the transition section on one side, so that a gap appears between the two joints. Then remove the wedges and the jacks. S7. Sequentially dismantle the transition section, standard section, and articulated section, and finally dismantle the construction platform.

7. A construction method for a universal cross bracing structure applicable to inclined cable tower construction according to claim 6, characterized in that: The standard section and the transition section are connected by a flange.

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