A filling type main cable saddle and a method of installing the same

Abstract

The application discloses a filling type main cable saddle and a mounting method thereof. The filling type main cable saddle comprises a main cable saddle steel component, and the main cable saddle steel component comprises a saddle head, and concrete is arranged below the saddle head. The mounting method of the filling type main cable saddle comprises the following steps: step 1, hoisting the main cable saddle steel component to the top of a tower; and step 2, filling concrete below the saddle head. The application has the advantages of small steel quantity, convenient transportation and on-site construction, and low cost, and in addition, the application has the characteristics of corrosion resistance and can withstand the erosion of natural environment such as wind and rain.

Description

Technical Field

[0001] This invention relates to the field of suspension bridge technology, and in particular to a filler-type main cable saddle and its installation method. Background Technology

[0002] A cable saddle is a structure specifically designed to support the suspension cable as it passes over the top of the tower and to smoothly change the direction of the main cable. The upper part of the saddle consists of ribbed cast steel blocks with grooves to hold the main cable strands. In rigid bridge towers, the saddle typically also has a row of rollers under the upper part, with a lower base plate below the rollers to better distribute the concentrated load from the rollers onto the tower column. In pendulum or flexible bridge towers, the saddle only has a cast steel upper part, which is fixed to the tower column with bolts. Cable saddles are generally divided into main cable saddles and auxiliary cable saddles. The main cable saddle of a suspension bridge is a crucial component supporting the main cable. It is used to hold the main cable and is generally located at the top of the main tower. Typically, depending on the bridge construction requirements, the main cable saddle needs to be pushed multiple times to its predetermined position at the top of the main tower.

[0003] Existing main cable saddles generally adopt a fully cast structure, a cast / forged and welded combined structure, or a fully welded structure. Regardless of the structure, they are characterized by large steel consumption, large structural dimensions, and heavy weight, which leads to problems such as difficult transportation in mountainous areas, difficult manufacturing in factories, and difficult on-site construction and hoisting. Summary of the Invention

[0004] The purpose of this invention is to provide a filler-type main cable saddle and its installation method to address the above-mentioned problems. It uses less steel, is convenient for transportation and on-site construction, and can reduce costs. In addition, it has anti-corrosion properties and can withstand the erosion of natural environments such as wind and rain.

[0005] The technical solution adopted in this invention is as follows:

[0006] A filling-type main cable saddle includes a main cable saddle steel component, the main cable saddle steel component includes a saddle head, and concrete is provided below the saddle head.

[0007] Alternatively, a support frame is provided below the saddle head, with the upper end of the support frame connected to the saddle head and the lower end of the support frame connected to a base plate.

[0008] Alternatively, the support frame may be provided with reinforcing bar holes.

[0009] Alternatively, the base plate may be provided with shear studs.

[0010] Alternatively, a lower support plate may be provided below the main cable saddle steel member, and the main cable saddle steel member and the lower support plate may move relative to each other along the longitudinal direction of the bridge. The lower support plate may be provided with a grouting port that runs vertically through the bridge.

[0011] Alternatively, a wear-reducing component may be provided above the lower bearing plate, and a stainless steel plate may be provided below the main cable saddle steel component.

[0012] Alternatively, the main cable saddle steel member may be provided with jacking columns on both sides, and the main cable saddle steel member may be provided with reaction members, with the jacking columns located on one side of the reaction members along the longitudinal direction of the bridge.

[0013] Alternatively, the lower bearing plate is provided with an end stop, which is located in the longitudinal direction of the main cable saddle steel member.

[0014] A method for installing a filler-type main cable saddle includes the following steps:

[0015] Step 1: Hoist the main cable saddle steel component to the top of the tower;

[0016] Step 2: Pour concrete under the saddle head.

[0017] Optionally, before step 1, the method may include: step 0, hoisting the lower support plate to the top of the main tower and grouting the area below the lower support plate through the grouting port reserved on the lower support plate;

[0018] In step 1, when the main cable saddle steel component is hoisted to the top of the tower, it is placed at the pre-offset position of the lower bearing plate;

[0019] It also includes: Step 3, gradually pushing the main cable saddle steel components during the main cable erection and beam erection processes;

[0020] The order of steps 2 and 3 can be interchanged.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. The present invention provides a filler-type main cable saddle, which separates the overall structure into main cable saddle steel components and filler concrete. During transportation, the main cable saddle steel components can be transported separately, solving the problem that the existing main cable saddles are too heavy and bulky, making them impossible to disassemble during transportation and causing transportation difficulties.

[0023] 2. The installation method of the main cable saddle provided by the present invention first hoists the steel components of the main cable saddle and then pours concrete, which solves the problems of high difficulty in manufacturing the main cable saddle in the factory and high difficulty in hoisting on site. Attached Figure Description

[0024] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of the filling-type main cable saddle before filling.

[0026] Figure 2This is a schematic diagram of the structure of the filling-type main cable saddle after filling.

[0027] Figure 3 This is a structural schematic diagram of the main cable saddle steel component.

[0028] Figure 4 yes Figure 3 Enlarged view of point A.

[0029] Figure 5 This is a structural schematic diagram of the lower support plate.

[0030] The markings in the diagram are: 1-Main cable saddle steel component, 11-Saddle head, 111-Saddle groove, 112-Diaphragm, 12-Support frame, 121-Reinforcing bar hole, 13-Bottom plate, 131-Shear stud, 14-Stainless steel plate, 15-Reaction component, 2-Concrete, 3-Lower bearing plate, 31-Grouting port, 32-Grinding reduction component, 4-Push column, 5-End stop. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings.

[0032] All features disclosed in this specification, or steps in all methods or processes disclosed herein, may be combined in any way, except for mutually exclusive features and / or steps.

[0033] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is merely one example of a series of equivalent or similar features.

[0034] A type of filler main cable saddle, such as Figure 1-5 As shown, a filling-type main cable saddle includes a main cable saddle steel component 1, the main cable saddle steel component 1 includes a saddle head 11, and concrete 2 is provided below the saddle head 11.

[0035] Specifically, existing main cable saddles all adopt an integral structure, while this invention provides a prefabricated main cable saddle. The complex main cable saddle steel component 1 is prefabricated from steel, while the supporting part, since its main function is to bear the load and transfer the enormous pressure from the main cable to the main tower, does not involve a specific structure and is therefore filled with concrete 2. This concrete is poured after on-site hoisting to form the main cable saddle, significantly reducing steel consumption compared to existing technologies and effectively lowering material costs. Furthermore, this invention only requires transporting the main cable saddle steel component 1, which significantly reduces the structural size and weight of the main cable saddle, avoiding transportation limitations due to excessive size or weight, and effectively reducing transportation costs. In addition, since the main cable saddle is located on water, existing integral steel main cable saddles are susceptible to oxidation, corrosion, and other environmental factors. The prefabricated concrete 2 main cable saddle provided by this invention has corrosion-resistant properties, can withstand wind and rain, and its main body can maintain stability after long-term use, without easily deforming or loosening. Concrete 2 also possesses high compressive strength, thus it can withstand the bridge's self-weight and external loads. Because the saddle head 11 of the cable saddle has a complex shape, and steel structures can manufacture components of varying sizes, shapes, and complexities, the saddle head 11 is made of steel. Furthermore, since the saddle head 11 bears the main cable, using steel provides it with good wear resistance. Further, the main cable saddle primarily causes the main cable of the suspension bridge to turn at the top of the tower; therefore, the saddle head 11 needs to have multiple saddle grooves 111 according to the arrangement of the main cable, and the saddle grooves 111 are separated from each other by partitions 112.

[0036] In another specific embodiment, a support frame 12 is provided below the saddle head 11. The upper end of the support frame 12 is connected to the saddle head 11, and the lower end of the support frame 12 is connected to a base plate 13. The support frame 12 allows the saddle head 11 to maintain a certain height to meet the needs of the main cable saddle. In addition, after raising the saddle head 11, the support frame 12 can also provide a pouring space below the saddle head 11 for the concrete 2. The base plate 13 can support the concrete 2, thereby integrating the main cable saddle steel component 1 and the concrete 2 into one unit. At the same time, it can also be used to push the main cable saddle steel component 1.

[0037] In another specific embodiment, the support frame 12 is provided with rebar holes 121. Because rebar has high strength and stiffness, it can enhance the strength and stiffness of the concrete 2, making it more stable and robust. Furthermore, the presence of rebar can resist compressive deformation of the concrete 2, and the composite material formed by the concrete 2 and rebar is more capable of resisting complex loads. The rebar holes 121 provide a location for the rebar, achieving the required rebar spacing.

[0038] In another specific embodiment, shear studs 131 are provided on the base plate 13. The shear studs 131 serve to transmit interfacial shear force, restrict interfacial slippage, prevent the concrete 2 from being lifted, ensure that the steel and concrete 2 share the load, and coordinate deformation. Placing the shear studs 131 on the base plate 13 effectively strengthens the connection between the base plate 13 and the concrete 2, prevents separation between the base plate 13 and the concrete 2, and improves the overall load-bearing performance of the main cable saddle.

[0039] In another specific implementation, a lower bearing plate 3 is provided below the main cable saddle member 1. The main cable saddle member 1 and the lower bearing plate 3 can move relative to each other along the longitudinal direction of the bridge. The lower bearing plate 3 is provided with a grouting port 31 that runs vertically through the structure. During the construction of the suspension bridge, as the stiffening girder is continuously installed, the tension of the main cable in the middle span increases, and the difference in horizontal force between the main cables in the middle and side spans also increases, causing the tower top to shift. This will greatly affect the design difficulty and economy of the tower. Therefore, by using the main cable saddle member 1 and the lower bearing plate 3, which can move relative to each other along the longitudinal direction of the bridge, the main cable saddle member 1 can be pre-shifted to the bank by a certain amount before the main cable is erected. Furthermore, during the hoisting of the stiffening girder, the main cable saddle member 1 can be gradually pushed towards the middle of the span, thereby ensuring the safety of the tower under stress. In addition, to prevent the position of the lower bearing plate 3 from shifting during the pushing process, the lower bearing plate 3 needs to be fixed to the main tower first. Concrete 2 can be poured into the lower part of the lower bearing plate 3 through the grouting port 31, thereby achieving the connection with the main tower. Furthermore, shear studs 131 are also provided below the lower support plate 3.

[0040] In another specific embodiment, a friction-reducing component 32 is provided above the lower bearing plate 3, and a stainless steel plate 14 is provided below the main cable saddle steel component 1. During jacking, the stainless steel plate 14 and the friction-reducing component 32 act as a sliding friction pair, which can reduce the coefficient of friction, reduce the jacking force, and improve the jacking operation effect of the cable saddle. In this embodiment, the friction-reducing component 32 is a PTFE plate. Specifically, the friction-reducing component 32 can also be a PTFE pillar, a PTFE copper substrate, or other friction-reducing materials.

[0041] In another specific implementation, the main cable saddle member 1 is provided with jacking columns 4 on both sides, and a reaction member 15 is provided inside the main cable saddle member 1. The jacking columns 4 are located on one side of the reaction member 15 along the longitudinal direction of the bridge. Since the jacking action is in the longitudinal direction of the bridge, the jacking columns 4 and the reaction member 15, which are spaced apart in the longitudinal direction of the bridge, can provide the jacking support force. Furthermore, the jacking columns 4 are fixedly connected to the main tower; the reaction member 15 is connected to the base plate 13, thereby driving the main cable saddle member 1 to move. In addition, the reaction member 15 penetrates through the main cable saddle member 1, which can make its force more balanced. The reaction member 15 is also provided with a rebar hole 121 for passing through rebar, improving the structural performance of the concrete 2.

[0042] In another specific implementation, the lower support plate 3 is provided with an end stop 5, which is located in the longitudinal direction of the main cable saddle member 1. After the main cable saddle member 1 is pushed into place, the end stop 5 can prevent it from moving again in the longitudinal direction of the bridge.

[0043] A method for installing a filler-type main cable saddle includes the following steps:

[0044] Step 1: Hoist the main cable saddle steel component 1 to the top of the tower;

[0045] Step 2: Pour concrete 2 into the lower part of the saddle head 11.

[0046] Specifically, this solution involves first hoisting the main cable saddle steel component 1, pushing it into place, and then pouring concrete 2. Compared to existing technologies that require hoisting the entire main cable saddle, this solution significantly reduces the hoisting weight, makes the hoisting process easier to control, and does not require large hoisting equipment, thereby reducing hoisting costs and facilitating on-site hoisting construction.

[0047] In step 2, concrete 2 is poured into the main cable saddle steel component 1 to provide support to the main cable saddle and transfer the enormous pressure from the main cable to the main tower. Those skilled in the art will know that during pouring, the concrete 2 is structurally sized by a template, and the template is removed after the concrete 2 has solidified.

[0048] As another specific implementation, before step 1, the method further includes: step 0, hoisting the lower support plate 3 to the top of the main tower, and grouting the lower part of the lower support plate 3 through the grouting port 31 reserved on the lower support plate 3;

[0049] In step 1, when the main cable saddle steel component 1 is hoisted to the top of the tower, it is placed at the pre-offset position of the lower bearing plate 3;

[0050] It also includes: Step 3, gradually pushing the main cable saddle steel component 1 during the main cable erection and beam erection process;

[0051] The order of steps 2 and 3 can be interchanged.

[0052] Because the empty cable shape of the suspension bridge's main cable differs significantly from the completed bridge shape, when jacking is required, step 0 involves pre-embedding the lower support plate 3 into the top of the main tower to position the subsequently hoisted main cable saddle steel component 1, preventing movement of the lower support plate 3 during jacking. Furthermore, since the main cable saddle transfers the load on the main cable to the main tower, using concrete 2 to connect the lower support plate 3 and the main tower ensures even load distribution and a tighter connection, reducing the likelihood of loosening and improving structural reliability. In step 1, the main cable saddle steel component 1 is pre-offset to the side span during installation to facilitate jacking. Step 3 involves manual, controlled jacking of the main cable saddle, reducing unbalanced horizontal forces on both sides by altering the main cable span and horizontal inclination angle, ensuring the center of the main cable saddle coincides with the centerline of the bridge tower upon completion. Because the jacking force is large, if the main cable saddle steel component 1 is not strong enough, directly jacking the main cable saddle steel component 1 will easily deform it. Therefore, it is necessary to first pour concrete 2 to make the main cable saddle have sufficient strength. When the main cable saddle steel component 1 is strong enough, it can be directly jacked.

[0053] In another specific implementation, in step 2, the concrete 2 is UHPC ultra-high performance concrete. Since the main cable saddle mainly bears vertical loads, the average stress of the existing cable saddle body is generally less than 50 MPa, while the compressive strength of UHPC ultra-high performance concrete can reach 100~120 MPa, which fully meets the usage requirements.

[0054] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

[0055] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them. Furthermore, "above," "over," and "on top" of the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

Claims

1. A filling-type main cable saddle, characterized in that: The system includes a main cable saddle steel component (1), which includes a saddle head (11). A concrete (2) is provided below the saddle head (11), and a support frame (12) is provided below the saddle head (11). The upper end of the support frame (12) is connected to the saddle head (11), and the lower end of the support frame (12) is connected to a base plate (13). Shear studs (131) are provided on the base plate (13). The support frame (12) allows the saddle head (11) to maintain a certain height to meet the needs of the main cable saddle. Furthermore, the support frame (12)... After the saddle head (11) is raised, it can also provide a grouting space below the saddle head (11) for concrete (2); a lower bearing plate (3) is provided below the main cable saddle steel member (1), and the main cable saddle steel member (1) and the lower bearing plate (3) can move relative to each other along the longitudinal direction of the bridge. A grouting port (31) is provided on the lower bearing plate (3) that runs through the top and bottom; a push column (4) is provided on both sides of the main cable saddle steel member (1), and a reaction member (15) is provided inside the main cable saddle steel member (1). The push column (4) is located on one side of the reaction member (15) along the longitudinal direction of the bridge.

2. The filling-type main cable saddle as described in claim 1, characterized in that: The support frame (12) is provided with steel bar holes (121).

3. The filling-type main cable saddle as described in claim 1, characterized in that: A wear-reducing component (32) is provided above the lower bearing plate (3), and a stainless steel plate (14) is provided below the main cable saddle steel component (1).

4. The filling-type main cable saddle as described in claim 1, characterized in that: The lower support plate (3) is provided with an end stop (5), which is located in the longitudinal direction of the main cable saddle steel member (1).

5. A method for installing a filler-type main cable saddle, using a filler-type main cable saddle as described in any one of claims 1-4, comprising the following steps: Step 1: Hoist the main cable saddle steel component (1) to the top of the tower; Step 2: Pour concrete (2) into the lower part of the saddle head (11). During pouring, the concrete (2) is restricted in terms of structural dimensions by using a template. The template is removed after the concrete (2) has formed.

6. The installation method of the filling-type main cable saddle as described in claim 5, characterized in that: Before step 1, the method further includes: step 0, hoisting the lower support plate (3) to the top of the main tower, and grouting the lower part of the lower support plate (3) through the grouting port (31) reserved on the lower support plate (3); In step 1, when the main cable saddle steel component (1) is hoisted to the top of the tower, it is placed at the pre-offset position of the lower bearing plate (3); It also includes: Step 3, gradually pushing the main cable saddle steel components (1) during the main cable erection and beam erection process; The order of steps 2 and 3 can be interchanged.

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