Active cross brace connecting joint suitable for cable bent tower of core steel pipe structure and implementation method

Abstract

The invention discloses an active cross brace connecting joint suitable for a cable bent tower of a core steel pipe structure and an implementation method. The active cross brace connecting joint comprises rigid cushion blocks and middle supports, steel pipes with good plane bidirectional section characteristics are adopted for the steel pipes, cross-shaped stiffening plates and sealing plates are arranged at the ends of the steel pipes to reinforce the ends, one ends of active cross braces are fixed ends, and the other ends of the active cross braces are fixed ends. And one end is an adjustable end, so that the application of active jacking force and the linear adjustment of the cable bent tower are realized. The assembly type platform is installed at the design position of the active cross brace, on one hand, the assembly type platform serves as a personnel operation platform, on the other hand, the assembly type platform serves as a temporary fixing platform of an active cross brace steel pipe, and the cross brace steel pipe is temporarily fixed to the assembly type platform after the distance between the fixed end and the movable end is measured; the position adjustment and welding of the steel pipe are optimized from the air to the fixed platform.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and more specifically, to an active cross brace connection joint applicable to a core steel pipe structure pylon and an implementation method thereof. Background Art

[0002] The pylon is an important load-bearing component of a bridge, and its construction quality is directly related to the service life of the bridge structure. During the cantilever construction process of the pylon, due to the action of its own weight and construction loads, large bending moments and tensile stresses are easily generated at the root of the pylon, resulting in concrete cracking, which seriously affects the overall safety and durability of the bridge structure. Therefore, it is necessary to set up temporary cross braces, which are also called active cross braces when active jacking forces need to be set up.

[0003] In recent years, the spanning ability of bridge structures has been increasing. Due to its good mechanical properties, and generally being prefabricated in factories and spliced on site with more controllable quality, steel structures are increasingly used in the construction of long-span bridges. As the main load-bearing components of the structure, the design and application of high-pier steel pylons have also gradually increased.

[0004] The design of conventional concrete pylon cross braces often involves embedding embedded parts, and the support structure is welded to the embedded parts. The connection structure is too simple. For the new combination type of steel pipe and concrete, the conventional active cross brace design is difficult to meet the requirements of construction technology, construction period, cost, efficiency, quality and safety. Summary of the Invention

[0005] Therefore, to solve the above deficiencies, the present invention provides an active cross brace connection joint applicable to a core steel pipe structure pylon and an implementation method thereof; it can closely fit the steel pipe surface, ensure uniform structural stress, avoid stress concentration, have less impact on the steel structure after removal, and is convenient for repair. And a fixed end and a movable end are designed, which can adjust the linearity multiple times during the construction of high-pier pylons, ensure the linearity of the pylon, release the jacking force of the active cross brace during removal, and ensure the construction quality of the structure, having significant advantages in terms of construction period, cost, quality and safety.

[0006] The present invention is implemented as follows. An active cross brace connection joint applicable to a core steel pipe structure pylon is constructed, and the structure of the active cross brace connection joint of the core steel pipe structure pylon includes: An active cross brace, which is processed from a steel pipe, with a cross stiffening plate and an end cover plate provided at the end, and its length is shorter than the pylon segment spacing for easy installation. It is hoisted to a prefabricated platform for temporary placement, with a fixed end provided at one end and a movable end provided at the other end, and the design position is selected at the diaphragm of the pylon segment; A jack, which is provided at the movable end of the active cross brace as a jacking device for linear adjustment of the pylon segment; Steel support. The steel support is a four-point steel pipe support, which is arranged at the movable end and the fixed end of the active cross brace. After the jack completes the linear adjustment of the tower section, the support fixes the active cross brace as the main load-bearing member. At the fixed end, the steel support is welded and fixed to both ends of the end sealing plate and the rigid cushion block. At the movable end, the steel support is only welded and fixed to the rigid cushion block and is movably connected to the end sealing plate to ensure that one end of the active cross brace is movable and adjustable. Rigid cushion block. The rigid cushion block is composed of steel plates, providing sufficient stiffness. The contact surface with the tower section is finely processed to ensure close contact and uniform stress with the tower section. The connection with the tower section adopts four-sided fillet welds to reduce the impact on the structural shape after removal.

[0007] According to the active cross brace connection joint for a core steel pipe structure tower of the present invention, it has the advantages of convenient installation and controllable quality, and includes: The active cross brace, the steel support and the rigid cushion block jointly form a structure for supporting the tower section. The length of the active cross brace is shorter than the spacing of the tower section, which greatly facilitates the installation. An assembled platform is set up to temporarily fix the active cross brace, avoiding the adjustment of the aerial posture, reducing the welding operation difficulty of the installation personnel, and making the installation quality more controllable.

[0008] According to the active cross brace connection joint for a core steel pipe structure tower of the present invention, the linear adjustment of the tower includes: One end of the active cross brace is a fixed-end steel support, and the other end is a movable end where a jack is installed to achieve multiple linear adjustments of the tower section.

[0009] According to the active cross brace connection joint for a core steel pipe structure tower of the present invention, it includes: The tower section is a steel pipe and steel box composite structure. The rigid cushion block ensures that the active cross brace adapts well to the curved surface of the steel pipe, ensuring uniform stress on the contact surface. The fillet weld connection is adopted, and there is no subsequent repair work after removal compared with the conventional embedded part method, ensuring the appearance quality of the steel structure tower.

[0010] According to the active cross brace connection joint for a core steel pipe structure tower of the present invention, the convenience of removal in the implementation method includes: When the active cross brace is removed, the jacking force of the active cross brace is released through the jack. The active cross brace is placed on the assembled platform for hoisting only under its own weight, and only the steel support is cut off, ensuring the integrity of the active cross brace structure and having better economy.

[0011] An implementation method of the active cross brace of the above active cross brace connection joint; the implementation method of the active cross brace of the core steel pipe structure tower includes: Install an assembled platform, process the active cross brace, with its length shorter than the distance between the pylon segments. After measuring the distances between the fixed end and the movable end, adjust the planar position of the active cross brace and temporarily fix it on the assembled platform. Connect the rigid cushion block to the core steel pipe of the pylon segment using fillet welds for the installation of the fixed end. The steel support is symmetrically welded to the rigid cushion block and the active cross brace steel pipe. After the active force is applied by the jack to the movable end of the active cross brace for a single jacking, install the steel supports in sequence. Before installing the last steel support, remove the jack. The steel support is symmetrically welded to the rigid cushion block and the active cross brace steel pipe to become the fixed end. For the movable end of the active cross brace for multiple jackings, the steel support is only welded to the rigid cushion block and uses a hard support for the active cross brace steel pipe to ensure that the length of the active cross brace can be adjusted multiple times. After the pylon is capped, remove the active cross brace from top to bottom in sequence. Release the active force through the jack at the movable end to ensure that the active cross brace is lifted out by the tower crane only under its own weight. Finally, mechanically grind the fillet weld connecting the rigid cushion block to the core steel pipe of the pylon segment to avoid affecting the appearance of the pylon.

[0012] The present invention has the following advantages: (1) By setting steel supports and rigid cushion blocks between the active cross brace and the pylon, the length of the active cross brace is reduced, making the installation more convenient. And by setting an assembled platform to temporarily fix the active cross brace, the position adjustment of the cross brace is more convenient and accurate, ensuring the quality and safety of the cross brace installation. (2) One end of the active cross brace is the fixed end and the other end is the movable end. When there are high-precision requirements for the linearity of the high-pier steel pylon, it can meet the multiple adjustments of the pylon linearity, which is beneficial to controlling the overall linearity of the structure. (3) The rigid cushion block can well adapt to the steel pipe curved surface of the steel pipe and steel box composite structure, ensuring uniform force on the contact surface. Using fillet welds for connection, there is no subsequent repair work for removal compared with the conventional embedded part method, ensuring the appearance quality of the steel structure pylon. (4) When removing the cross brace, the release of the active thrust of the active cross brace is realized, ensuring the safety during the removal process and also ensuring the integrity of the main structure of the active cross brace, with good economy. Description of the Drawings

[0013] Figure 1 It is a structural diagram of the connection joint of the active cross brace applicable to the core steel pipe structure pylon and the connection joint implementation method; Figure 2 It is a schematic diagram of the rigid cushion block of the active cross brace applicable to the core steel pipe structure pylon and the connection joint implementation method; Figure 3 It is a plan view of the steel support of the active cross brace applicable to the core steel pipe structure pylon and the connection joint implementation method; Figure 4It is an installation schematic diagram (I) of an active cross brace connection joint applicable to a core steel pipe structure cable tower and an implementation method; Figure 5 It is an installation schematic diagram (II) of an active cross brace connection joint applicable to a core steel pipe structure cable tower and an implementation method; Among them: active cross brace 1, jack 2, assembled platform 3, cross stiffening plate 4, end sealing plate 5, steel section support 6, rigid cushion block 7, cable tower segment 8, diaphragm 9, tower crane 10. Specific implementation method

[0014] The following will combine the attached Figures 1 - 5 The present invention will be described in detail. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] The following is a detailed description thereof: The present invention constructs an active cross brace connection joint applicable to a core steel pipe structure cable tower and an implementation method, which involves the structure of the active cross brace connection joint and the installation, active force application, and removal operations of the active cross brace: The structure of the active cross brace connection joint of the core steel pipe structure cable tower includes: Active cross brace 1, which is processed from a steel pipe. Cross stiffening plate 4 and end sealing plate 5 are arranged at the end. The length is shorter than the spacing of the cable tower segment 8 for easy installation. It is hoisted to the assembled platform 3 for temporary placement. One end is set as a fixed end and the other end is set as a movable end. The design position is selected at the diaphragm 9 of the cable tower segment 8; Jack 2, which is arranged at the movable end of the active cross brace 1 as a jacking device for linear adjustment of the cable tower segment 8; Steel section support 6, which is a four-point steel pipe support arranged at the movable end and the fixed end of the active cross brace 1. After the jack 2 completes the linear adjustment of the cable tower segment 8, it supports and fixes the active cross brace 1 as the main load-bearing member. The steel section support 6 at the fixed end is welded and fixed to both ends of the end sealing plate 5 and the rigid cushion block 7. The steel section support 6 at the movable end is only welded and fixed to the rigid cushion block 7 and is movably connected to the end sealing plate 5 to ensure that one end of the active cross brace 1 can move and be adjusted; Rigid cushion block 7, which is composed of steel plates, provides sufficient stiffness. The contact surface with the cable tower segment 8 is finely processed to ensure close contact and uniform stress with the cable tower segment 8. The connection with the cable tower segment 8 uses four-sided fillet welds to reduce the impact on the structure shape after removal; The implementation method of the active cross brace of the core steel pipe structure cable tower includes: Install the prefabricated platform 3, process the active cross brace 1, with its length shorter than the spacing of the tower segments 8. After measuring the distances between the fixed end and the movable end, adjust the planar position of the active cross brace 1 and temporarily fix it on the prefabricated platform 3. Connect the rigid cushion block 7 to the core steel pipe of the tower segment 8 by fillet welding for the installation of the fixed end. The steel support 6 is symmetrically welded to the rigid cushion block 7 and the steel pipe of the active cross brace 1. After the active force is applied by the jack 2 to the movable end of the active cross brace 1 for a single jacking, install the steel supports 6 in sequence. Before installing the last steel support 6, remove the jack 2, and the steel support 6 is symmetrically welded to the rigid cushion block 7 and the steel pipe of the active cross brace 1 to become the fixed end. For the movable end of the active cross brace 1 for multiple jackings, the steel support 6 is only welded to the rigid cushion block 7 and is supported rigidly with the steel pipe of the active cross brace 1 to ensure that the length of the active cross brace 1 can be adjusted multiple times. After the tower is capped, remove the active cross brace 1 from top to bottom in sequence. Release the active force through the jack 2 at the movable end to ensure that the active cross brace 1 is lifted out by the tower crane only under its own weight. Finally, mechanically grind the fillet weld connecting the rigid cushion block 7 and the core steel pipe of the tower segment 8 to avoid affecting the appearance of the tower.

[0016] The first aspect of the present invention provides the installation convenience and quality controllability of an active cross brace connection joint and an implementation method applicable to a core steel pipe structure tower, including: The active cross brace 1, the steel support 6, and the rigid cushion block 7 jointly form a structure for supporting the tower segment 8. The length of the active cross brace 1 being shorter than the spacing of the tower segments 8 greatly facilitates the installation. Setting up the prefabricated platform 3 to temporarily fix the active cross brace 1 avoids the adjustment of the aerial posture, reduces the welding operation difficulty of the installers, and makes the installation quality more controllable.

[0017] The second aspect of the present invention provides the tower linear adjustment of an active cross brace connection joint and an implementation method applicable to a core steel pipe structure tower, including: One end of the active cross brace 1 is a fixed-end steel support 6, and the other end is a movable end where a jack 2 is installed, which can realize multiple linear adjustments of the tower segment 8.

[0018] The third aspect of the present invention provides the reliability of an active cross brace connection joint and an implementation method applicable to a core steel pipe structure tower, including: The tower segment 8 is a steel pipe and steel box composite structure. The rigid cushion block 7 ensures that the active cross brace 1 can better adapt to the curved surface of the steel pipe, ensuring uniform force on the contact surface. Using fillet welding, there is no subsequent demolition and repair work compared with the conventional embedded part method, ensuring the appearance quality of the steel structure tower.

[0019] The fourth aspect of the present invention provides the demolition convenience of an active cross brace connection joint and an implementation method applicable to a core steel pipe structure tower, including: When the active cross brace 1 is removed, the jacking force of the active cross brace 1 is released through the jack 2. The active cross brace 1 is placed on the assembled platform 3 for hoisting only under its own weight, and only the steel support 3 is cut off, ensuring the integrity of the structure of the active cross brace 1 and having better economy.

[0020] The specific implementation steps of this patent are as follows: (1) When the pylon is constructed to the designed section, the assembled platform is hoisted as a whole for installation; (2) Measure and set out the positions of the rigid pads, and connect and fix the rigid pads to the steel pipes by fillet welding; (3) Hoist the active cross brace as a whole to the assembled platform, adjust the position and then make temporary fixation; (4) Measure the distance between the rigid pad at the fixed end and the active cross brace, and install the steel support at the fixed end; (5) For the flexible end of the active cross brace, first install a jack to apply the active force. For the flexible end that only needs one jacking, after the active jacking force is applied, install the steel support. Before installing the last steel support, take out the jack, install the last steel support, and weld and fix the steel support to the rigid pad and the active cross brace; For the flexible end that needs multiple jackings, weld and fix the steel support to the rigid pad, and make a rigid support at the end of the active cross brace without welding; (6) After that, after the pylon section is installed to the designed position, repeat the installation of the remaining active cross braces; (7) After the pylon is capped, remove the active cross brace. The removal sequence is to relax the jacking force → remove the horizontal brace → remove the steel support and the rigid pad → remove the construction platform. Use the jack to initially push the cross brace. After the intermediate steel support is not stressed, remove it one by one, and then release the pressure of the jack to make the horizontal cross brace in a state without horizontal jacking force. After the horizontal cross brace is no longer stressed, the cross brace can be removed. Use the tower crane to first lift one side of the cross brace pipe to a small height and then slowly pull it out. The subsequent removal is the same.

[0021] In the embodiment of the present invention, only the application and installation of the present invention are described. For other similar construction methods, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] Through the implementation of this patent, the following advantages are achieved: (1) By arranging steel supports and rigid pads between the active cross brace and the pylon, the length of the active cross brace is reduced, making the installation more convenient. And by setting an assembled platform to temporarily fix the active cross brace, the position adjustment of the cross brace is more convenient and accurate, ensuring the quality and safety of the cross brace installation; (2) One end of the active cross brace is a fixed end and the other end is a movable end. When there are high-precision requirements for the linearity of the high pier steel cable tower, it can meet the multiple adjustments of the cable tower linearity, which is beneficial to controlling the overall linearity of the structure; (3) The rigid cushion block can well adapt to the steel pipe curved surface of the steel pipe and steel box composite structure, ensuring uniform stress on the contact surface. The fillet weld connection is adopted, and there is no need for subsequent demolition and repair work compared with the conventional embedded part method, ensuring the appearance quality of the steel structure cable tower; (4) When the cross brace is demolished, the release of the jacking force of the active cross brace is realized, ensuring the safety during the demolition process and also ensuring the integrity of the main structure of the active cross brace, with good economy.

Claims

1. An active cross brace connection joint applicable to a cable tower with a core steel pipe structure, characterized in that; The structure of the active cross brace connection joint of the core steel pipe structure cable tower includes: The active cross brace (1) is processed from a steel pipe. Cross stiffening plates (4) and end sealing plates (5) are arranged at the ends. Its length is shorter than the spacing of the cable tower segments (8), which is convenient for installation. It is hoisted onto the assembled platform (3) for temporary placement. One end is set as a fixed end and the other end is set as a movable end. The design position is selected at the diaphragm (9) of the cable tower segment (8). The jack (2) is arranged at the movable end of the active cross brace (1) as a jacking device for linear adjustment of the cable tower segment (8). The steel support (6) is a four-point steel pipe support, which is arranged at the movable end and the fixed end of the active cross brace (1). After the jack (2) completes the linear adjustment of the cable tower segment (8), it supports and fixes the active cross brace (1) as the main load-bearing member. The steel support (6) at the fixed end is welded and fixed to both ends of the end sealing plate (5) and the rigid cushion block (7). The steel support (6) at the movable end is only welded and fixed to the rigid cushion block (7) and is movably connected to the end sealing plate (5) to ensure that one end of the active cross brace (1) is movable and adjustable. The rigid cushion block (7) is composed of a combination of steel plates, providing sufficient stiffness. The contact surface with the cable tower segment (8) is finely processed to ensure close contact and uniform force with the cable tower segment (8). The connection with the cable tower segment (8) uses four-sided fillet welds to reduce the impact on the structural appearance after removal.

2. The active cross brace connection joint applicable to the core steel pipe structure cable tower according to claim 1, characterized in that; The active cross brace (1), the steel support (6), and the rigid cushion block (7) jointly form a structure to support the cable tower segment (8). The length of the active cross brace (1) is shorter than the spacing of the cable tower segments (8), which greatly facilitates the installation. The assembled platform (3) is set up to temporarily fix the active cross brace (1), avoiding the adjustment of the attitude in the air, reducing the welding operation difficulty of the installation personnel, and making the installation quality more controllable.

3. The active cross brace connection joint for a core steel tube structure cable tower according to claim 1, characterized in that it includes: One end of the active cross brace (1) is a fixed-end steel support (6), and the other end is a movable end where a jack (2) is installed, which can realize multiple linear adjustments of the cable tower segment (8).

4. The active cross-brace connection joint applicable to the core steel pipe structure cable tower according to claim 1, wherein The cable tower segment (8) is a combined structure of a steel pipe and a steel box. The rigid cushion block (7) ensures that the active cross brace (1) adapts well to the curved surface of the steel pipe, ensuring uniform force on the contact surface. Using fillet welds for connection, compared with the conventional embedded part method, there is no subsequent repair work after removal, ensuring the appearance quality of the steel structure cable tower.

5. The active cross brace connection joint applicable to the core steel pipe structure cable tower according to claim 1, wherein When the active cross brace (1) is removed, the jacking force of the active cross brace (1) is released through the jack (2). The active cross brace (1) is placed on the assembled platform (3) for hoisting only under its own weight, and only the steel support (3) is cut off, ensuring the integrity of the structure of the active cross brace (1) and having good economy.

6. A method for implementing an active cross brace of the active cross brace connection joint according to claim 1, characterized in that; It includes the installation, application of the main force, and related operations of the removal of the active cross brace; Install the assembled platform (3), process the active cross brace (1) with a length shorter than the spacing of the cable tower segments (8). After measuring the distances between the fixed end and the movable end, adjust the plane position of the active cross brace (1) and temporarily fix it on the assembled platform (3). The rigid cushion block (7) is connected to the core steel pipe of the tower segment (8) by fillet welds for the installation of the fixed end. The steel support (6) is symmetrically welded to the rigid cushion block (7) and the steel pipe of the active cross brace (1). After the active force is applied by the jack (2) at the flexible end of the active cross brace (1) for a single jacking, the steel support (6) is installed successively. Before the last steel support (6) is installed, the jack (2) is removed. The steel support (6) is symmetrically welded to the rigid cushion block (7) and the steel pipe of the active cross brace (1) to become the fixed end. For the flexible end of the active cross brace (1) for multiple jackings, the steel support (6) is only welded to the rigid cushion block (7), and a hard support is used with the steel pipe of the active cross brace (1) to ensure that the length of the active cross brace (1) is adjustable multiple times. After the tower is capped, the active cross braces (1) are removed successively from top to bottom. The active force is released through the jack (2) at the flexible end to ensure that the active cross braces (1) are lifted out successively by the tower crane only under their own weights. Finally, the fillet weld connecting the rigid cushion block (7) and the core steel pipe of the tower segment (8) is mechanically removed to avoid affecting the appearance of the tower.

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