Connecting plate for internal corner point position of double-layer steel shell combined tower and installation method thereof

Abstract

This invention provides a connecting plate and its installation method for the internal corner positions of a double-layer steel shell composite tower. By welding the welded portions at the two corners of one side of the plate to two adjacent circumferential reinforcing ribs on the inner side of the outer steel shell, and simultaneously welding the top and bottom edges near the other side of the plate to two adjacent circumferential reinforcing ribs at the outer corner positions of the inner steel shell, the expansion of the two sides of the inner steel shell towards the outer steel shell is prevented. This avoids the force at the right-angle corner formed by the two sides of the inner steel shell from diffusing into the concrete, avoids the need for node plates on the circumferential reinforcing ribs, ensures the integrity of the circumferential reinforcing ribs, reduces the impact on the density of the concrete pouring inside the tower, and eliminates the need for structural steel sections. Furthermore, by providing through holes and rebar passage slots on the connecting plate, conflicts between the connecting plate and vertical or circumferential reinforcing bars are avoided, thereby enhancing the cross-sectional performance of the bridge tower.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a connecting plate for the internal corner positions of a double-layer steel shell composite tower and its installation method. Background Technology

[0002] Bridge towers are the core components of cable-stayed bridges. With the increasing spans of cable-stayed and suspension bridges, higher demands are placed on the load-bearing capacity of the main towers. Currently, a steel-shell composite structure is generally formed by rationally using steel and concrete, two materials with different properties, to improve the load-bearing capacity of the towers, enhance durability, and reduce bridge costs. This type of bridge tower formed by a steel-shell composite structure is called a double-layer steel-shell composite tower. Steel-shell composite bridge towers typically employ a hollow cross-section to reduce self-weight load. During construction, the interior of the hollow tower can be used to install elevators and ladders, greatly facilitating construction workers and increasing the application scenarios for composite bridges where the inner and outer double-layer steel shells are bonded to the concrete during pouring via shear connectors.

[0003] Partial structure of the double-layer steel shell combined tower, such as Figure 1 As shown, it mainly consists of an outer steel shell and an inner steel shell, as well as concrete poured between them. The outer steel shell needs to be shaped to suit landscaping requirements and is generally curved, while the inner steel shell has a regular shape, typically rectangular. The corner points of the inner steel shell are called the corner points of the double-shell composite tower, and the rectangular sides of the inner steel shell are called the hollow areas. Figure 1 In the double-shell tower, the two side steel plates of the inner steel shell form a 90° angle. When the double-shell tower is subjected to axial pressure, the two side steel plates expand in the direction of the outer steel shell. The deformation trend is combined to produce deformation and force flow along the diagonal of the rectangle (such as...). Figure 1 As shown by the middle arrow, it's like a sharp cleaver cutting into the concrete, which is extremely detrimental to the concrete's stress distribution.

[0004] To enhance the connection stiffness between the inner and outer steel shells, reduce the relative deformation of the inner and outer steel shells during steel structure welding and concrete pouring, and improve the overall integrity of the composite section, existing technologies typically utilize angle steel or channel steel to strengthen the connection between the inner and outer shells. Specifically, for example... Figure 2 As shown, by crossing two steel sections and connecting their free ends to the circumferential reinforcing ribs on the inner and outer steel shells, the expansion of the two side steel plates toward the outer steel shell is prevented.

[0005] However, the aforementioned prior art has the following technical defects:

[0006] (1) It is necessary to install node plates on each layer of circumferential reinforcing ribs on the inner sidewall of the bridge tower to connect the free ends of the steel section, which affects the integrity of the circumferential reinforcing ribs and the density of the concrete pouring inside the tower.

[0007] (2) The arrangement of the steel section is prone to conflict with the vertical reinforcement or the circumferential reinforcement of the section. At the point of conflict, it is necessary to cut off part of the stirrups, which weakens the performance of the section.

[0008] (3) The rigidity of the steel itself is limited, and its connection and constraint effect on the inner and outer steel shells is relatively small, making it difficult to resist the expansion of the two side steel plates of the inner steel shell for a long time. Summary of the Invention

[0009] The first objective of this invention is to provide a connecting plate for the internal corner positions of a double-layer steel shell composite tower, which aims to prevent the force at the right-angle corner formed by the two sides of the inner steel shell from diffusing into the concrete.

[0010] The second objective of this invention is to provide a method for installing a connecting plate at the internal corner position of a double-layer steel shell composite tower, which aims to improve the welding deformation of the outer steel shell during the improvement process.

[0011] To achieve the first objective, the present invention adopts the following technical solution:

[0012] A connecting plate for the internal corner positions of a double-layer steel shell composite tower, the double-layer steel shell composite tower including an outer steel shell, an inner steel shell, and concrete filling the space between the outer and inner steel shells, wherein circumferential reinforcing ribs are provided at equal intervals along the vertical direction on the inner side of the outer steel shell and the outer side of the inner steel shell, characterized in that the connecting plate is a plate body, and a welded part for connecting two adjacent circumferential reinforcing ribs on the inner side of the outer steel shell is provided at the two corners of one side of the plate body, and a horizontally extending perforated plate connector is provided in the middle of one end face of the plate body, wherein through holes for vertical reinforcing bars are evenly arranged on the perforated plate connector, and shear studs are evenly arranged on the plate body end faces on the upper and lower sides of the perforated plate connector, as well as on the plate body end face opposite to the perforated plate.

[0013] By welding the two corners of one side of the plate to the two adjacent circumferential reinforcing ribs on the inner side of the outer steel shell, and simultaneously welding the top and bottom edges of the plate to the two adjacent circumferential reinforcing ribs at the outer corners of the inner steel shell, the expansion of the two sides of the inner steel shell towards the outer steel shell is prevented, thus avoiding the diffusion of the force at the right-angle corner formed by the two sides of the inner steel shell into the concrete.

[0014] The above technical solution can be improved as follows:

[0015] As a further improvement, a slot for concrete flow is provided at the middle of the top edge, the middle of the bottom edge, and between the two welded parts of the plate.

[0016] The aforementioned improvements include the creation of a slot between the two welded sections of the plate, which not only allows concrete to flow but also ensures that construction workers have ample space for welding operations. Furthermore, since a connecting plate is welded between every two layers of circumferential reinforcing ribs, the slots of every two connecting plates from top to bottom meet to form an elliptical opening, which facilitates the diffusion of the poured concrete at the bottom of the bridge tower under the action of gravity.

[0017] As a further improvement, a rebar passage groove is provided on the side of the plate adjacent to the inner steel shell for the passage of circumferential rebars.

[0018] The above improvement avoids the circumferential reinforcement being cut off due to interference with the connecting plate by creating a reinforcement passage groove at the height of the circumferential reinforcement at the corresponding section on the side adjacent to the inner steel shell.

[0019] To achieve the second objective, the present invention adopts the following technical solution:

[0020] A method for installing a connecting plate at the internal corner position of a double-layer steel shell composite tower, the double-layer steel shell composite tower comprising an outer steel shell with an arc shape, an inner steel shell, and concrete filling the space between the outer and inner steel shells, wherein circumferential reinforcing ribs are equally spaced along the vertical direction on the inner side of the outer steel shell and the outer side of the inner steel shell, characterized in that the outer steel shell is composed of straight segments and arc segments, the straight segments corresponding to the corner positions of the inner steel shell, and the method for installing the connecting plate at the internal corner position of the double-layer steel shell composite tower includes the following steps:

[0021] First, weld the welded part on one side of the connecting plate to the two adjacent circumferential reinforcing ribs on the inner side of the straight section of the outer steel shell;

[0022] Then weld the top and bottom edges of the other side of the connecting plate to the two adjacent circumferential reinforcing ribs at the outer corner of the inner steel shell.

[0023] The curved segments of the outer steel shell are welded together with the straight segments.

[0024] By using the above installation method, the connecting plate strengthens the outer steel shell, thus preventing deformation that would occur during butt welding of the various sections of the outer steel shell.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) It avoids setting node plates on the circumferential reinforcing ribs, ensuring the integrity of the circumferential reinforcing ribs and reducing the impact on the density of the concrete pouring inside the tower.

[0027] (2) The steel section was eliminated. At the same time, by setting through holes and steel bar passage grooves on the connecting plate, the connection plate was prevented from conflicting with the vertical steel bar or the circumferential steel bar of the cross section, thereby enhancing the cross-sectional performance of the bridge tower.

[0028] (3) The plate body of the connecting plate can be selected with extremely high rigidity and durability according to the design requirements, which can resist the long-term expansion of the two side steel plates of the inner steel shell. Attached Figure Description

[0029] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments will be briefly described below.

[0030] Figure 1 This is a partial structural diagram of a double-layer steel shell composite tower.

[0031] Figure 2 This is a schematic diagram of the internal structure of a double-layer steel shell composite tower under existing technology.

[0032] Figure 3 This is a schematic diagram of the plan layout of the double-layer steel shell combined tower after the connecting plate is installed in this invention;

[0033] Figure 4 This is a cross-sectional view of the connecting plate described in this invention inside a double-layer steel shell combined tower;

[0034] Figure 5 This is a frontal elevation view of the connecting plate of the present invention welded to the circumferential reinforcing rib.

[0035] Figure 6 This is a side elevation view of the connecting plate of the present invention when it is welded to the circumferential reinforcing rib.

[0036] Figure 7 This is a diagram showing the arrangement of reinforcing bars near the connecting plate described in this invention;

[0037] Figure 8 This is a partial three-dimensional structural view of the perforated plate connector facing the connecting plate.

[0038] Figure 9 A partial three-dimensional structural diagram of the perforated plate connector facing away from the connecting plate;

[0039] To aid in understanding the invention, the following numbers are provided for the components and / or parts found in the accompanying drawings:

[0040] 1. Outer steel shell; 11. Straight section; 12. Curved section; 2. Inner steel shell; 3. Concrete; 4. Corner position; 5. Circumferential reinforcing rib; 6. Through hole; 7. Shear stud; 8. Plate; 81. Welded part; 82. Perforated plate connector; 83. Groove; 84. Reinforcing bar through groove; 9. Elliptical opening; 10. Circumferential reinforcing bar; 20. Vertical reinforcing bar.

[0041] It should be understood that the accompanying drawings are not necessarily drawn to scale. Obviously, the above drawings are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings by referring to these drawings without any creative effort. Detailed Implementation

[0042] The technical solutions in the embodiments of the present invention will now be clearly and completely described in conjunction with the accompanying drawings.

[0043] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0044] like Figures 3 to 6 As shown, the present invention provides a connecting plate for the internal corner position 4 of a double-layer steel shell composite tower. The double-layer steel shell composite tower includes an outer steel shell 1 with an arc shape, an inner steel shell 2, and concrete 3 filling the space between the outer steel shell 1 and the inner steel shell 2. The inner side of the outer steel shell 1 and the outer side of the inner steel shell 2 are provided with circumferential reinforcing ribs 5 at equal intervals along the vertical direction. The end faces of the circumferential reinforcing ribs 5 are provided with through holes 6 at equal intervals for vertical reinforcing bars 20 to pass through. At the same time, shear studs 7 are evenly distributed on the inner wall of the outer steel shell 1 and the outer wall of the inner steel shell 2. The connecting plate is a plate body 8. Two corners on one side of the plate body 8 are respectively provided with a welded part 81 for connecting two adjacent circumferential reinforcing ribs 5 on the inner side of the outer steel shell 1. A horizontally extending perforated plate connector 82 is provided in the middle of one end face of the plate body 8. Through holes 6 for vertical reinforcing bars 20 to pass through are evenly arranged on the perforated plate connector 82. Shear studs 7 are evenly arranged on the end faces of the plate body 8 on the upper and lower sides of the perforated plate connector 82, as well as on the end face of the plate body 8 on the other side of the perforated plate.

[0045] like Figures 3 to 4 ,as well as Figures 8 to 9As shown, by welding the welded parts 81 at the two corners of one side of the plate 8 to the two adjacent circumferential reinforcing ribs 5 on the inner side of the outer steel shell 1, and simultaneously welding the top and bottom edges of the plate 8 to the two adjacent circumferential reinforcing ribs 5 at the outer corner point 4 of the inner steel shell 2, the expansion of the two sides of the inner steel shell 2 towards the outer steel shell 1 is prevented, thus avoiding the diffusion of the force at the right angle corner point formed by the two sides of the inner steel shell 2 towards the concrete 3.

[0046] like Figure 5 , Figure 8 and Figure 9 As shown, a slot 83 for the flow of concrete 3 is opened at the middle of the top edge, the middle of the bottom edge, and between the two welded parts 81 of the plate 8. In addition to allowing the concrete 3 to flow, it also ensures that the construction personnel have sufficient space for welding operations. Since a connecting plate is welded between every two layers of circumferential reinforcing ribs 5, the slots 83 of every two connecting plates from top to bottom are connected to form an elliptical opening 9, which facilitates the diffusion of the poured concrete 3 at the bottom of the bridge tower under the action of gravity.

[0047] The specific arrangement of the circumferential reinforcement 10 passing through the connecting plate is as follows: Figure 7 As shown, to avoid the circumferential reinforcement 10 being cut off due to interference with the connecting plate, as follows... Figure 5 As shown, a steel bar passage groove 84 is provided at the height of the circumferential steel bar 10 on the side of the plate 8 adjacent to the inner steel shell 2 for the steel bar to pass through.

[0048] like Figure 3 As shown, since the outer steel shell 1 needs to be shaped to meet landscape requirements, it is generally curved. The outer steel shell 1 is composed of a straight segment 11 and a curved segment 12. The straight segment 11 corresponds to the corner position 4 of the inner steel shell 2. In order to avoid deformation of the outer steel shell 1 when welding with the connecting plate, the installation method of the connecting plate used for the inner corner position 4 of the double-layer steel shell composite tower includes the following steps:

[0049] Step 1: First, weld the welding part 81 on one side of the connecting plate to the two adjacent circumferential reinforcing ribs 5 on the inner side of the straight section 11 of the outer steel shell 1.

[0050] Step 2: Weld the top and bottom edges of the other side of the connecting plate to the two adjacent circumferential reinforcing ribs 5 at the outer corner point 4 of the inner steel shell 2.

[0051] Step 3: Weld the arc segment 12 of the outer steel shell 1 to the straight segment 11.

[0052] The present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A connecting plate for the internal corner position (4) of a double-layer steel shell composite tower, the double-layer steel shell composite tower comprising an arc-shaped outer steel shell (1), an inner steel shell (2), and concrete (3) filling the space between the outer steel shell (1) and the inner steel shell (2), wherein circumferential reinforcing ribs (5) are provided at equal intervals along the vertical direction on the inner side of the outer steel shell (1) and the outer side of the inner steel shell (2), characterized in that, The connecting plate is a plate (8). Two corners on one side of the plate (8) are respectively provided with welded portions (81) for connecting two adjacent circumferential reinforcing ribs (5) on the inner side of the outer steel shell (1). Simultaneously, the top and bottom edges near the other side of the plate (8) are welded to two adjacent circumferential reinforcing ribs (5) at the outer corners of the inner steel shell (2). A horizontally extending perforated plate connector (82) is provided in the middle of one end face of the plate (8). The perforated plate connector (82) is evenly arranged with vertical reinforcing bars (…). 20) Through the through hole (6), shear studs (7) are evenly arranged on the end face of the plate (8) on both sides of the opening plate connector (82) and on the end face of the plate (8) on the other side of the opening plate. A slot (83) for concrete (3) to flow is opened in the middle of the top edge, the middle of the bottom edge and between the two welded parts (81) of the plate (8). A steel bar passage slot (84) for the circumferential steel bar (10) to pass through is opened on the side of the plate (8) adjacent to the inner steel shell (2).

2. A method for installing a connecting plate at the internal corner position of a double-layer steel shell composite tower as described in claim 1, wherein the double-layer steel shell composite tower comprises an outer steel shell (1) with an arc shape, an inner steel shell (2), and concrete (3) filling the space between the outer steel shell (1) and the inner steel shell (2), wherein circumferential reinforcing ribs (5) are provided at equal intervals along the vertical direction on the inner side of the outer steel shell (1) and the outer side of the inner steel shell (2), characterized in that, The outer steel shell (1) is composed of a straight segment (11) and an arc segment (12), wherein the straight segment (11) corresponds to the corner position (4) of the inner steel shell (2). The installation method of the connecting plate used for the inner corner position (4) of the double-layer steel shell combined tower includes the following steps: First, weld the welding part (81) on one side of the connecting plate to the two adjacent circumferential reinforcing ribs (5) on the inner side of the straight section (11) of the outer steel shell (1); then weld the top and bottom edges of the other side of the connecting plate to the two adjacent circumferential reinforcing ribs (5) at the outer corner point (4) of the inner steel shell (2); finally, weld the arc section (12) of the outer steel shell (1) to the straight section (11).

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