Cable-clip-like auxiliary cable saddle mounting method based on fabricated temporary cable saddle

Abstract

The invention belongs to the technical field of suspension bridge upper structure construction, and particularly relates to a cable clamp type auxiliary cable saddle installation method based on an assembly type temporary cable saddle. The invention discloses a cable-clip-like auxiliary cable saddle mounting method based on an assembled temporary cable saddle. The cable-clip-like auxiliary cable saddle mounting method comprises the following steps that mounting construction of a main tower and an auxiliary tower is completed; a main cable saddle and an assembly type temporary cable saddle are installed, then cable strand erection is conducted on the basis of the assembly type temporary cable saddle, and cable strand sag alignment, cable tightening and cable clamp installation are completed; hoisting a stiffening beam in the midspan, pushing the main cable saddle towards the midspan to lift the main cable to a set height, dismounting the fabricated temporary cable saddle, mounting the lower half saddle body of the cable-clip-like auxiliary cable saddle, and then mounting the upper half saddle body to complete the mounting of the cable-clip-like auxiliary cable saddle. By means of the structural characteristics of the suspension bridge, additional internal force generated on the main tower and the auxiliary tower and bidirectional pushing of the main cable saddle are avoided, sag adjustment of the cable strands is facilitated, safety and reliability are achieved, and the safety risk in the whole construction process is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of suspension bridge superstructure construction, and in particular relates to a cable-clamp-type auxiliary saddle installation method based on an assembled temporary saddle. Background Art

[0002] With the in-depth implementation of the Outline for Building a Strong Transportation Nation, more and more long-span bridges are being built, and suspension bridges, with their own structural advantages, account for a considerable proportion of long-span bridges such as those across rivers and seas. In the structure of suspension bridges, the main cable is one of the important load-bearing components for transmitting loads. With the increase in the span of suspension bridges and the restrictions of terrain conditions, it is often necessary to use extra-long side cables.

[0003] However, due to the deadweight of the main cable, the extra-long side cable will have a large sag and even affect the stress of the main tower. Therefore, in order to reduce the additional stress on the structure and avoid irreversible damage to the main tower and other components, a support structure needs to be set at the corresponding position of the extra-long side cable. The support structure generally chooses to set a sub-tower at the side span, and a cable clamp-type sub-saddle is set on the sub-tower to fix the main cable to prevent the main cable from being affected by external loads and causing relative displacement with the sub-tower during the later operation, causing safety hazards. The cross-section of the cable clamp-type sub-saddle is circular, and its inner diameter is usually designed to be the diameter of the main cable in the bridge state. However, the cross-section of the main cable during installation is hexagonal, which does not match the cross-section of the cable clamp-type sub-saddle, and there is no longitudinal constraint structure for the cable strand inside the cable clamp-type sub-saddle. Therefore, if the cable clamp-type sub-saddle is installed during the cable strand installation, it will make it difficult to enter the saddle and adjust the sag of the cable strand. In addition, due to the influence of its own weight, the main cable transmits a large pressure downward, which leads to a great risk during the installation of the cable clamp type auxiliary saddle.

[0004] In the existing method, the two main cables from the main tower to the auxiliary tower and from the auxiliary tower to the anchor are installed as a whole large side span, and then the main cable saddle is pushed toward the mid-span to lift the main cable, and then the cable clamp-type auxiliary cable saddle is installed, and then the main cable saddle is pushed in the opposite direction to make the main cable fall back. However, in this process, due to the large sag of the extra-long side cable under the action of its own weight, a large unbalanced force will be generated on the top of the tower. At the same time, the large sag will also require the top segment of the auxiliary tower to be installed later, which not only has a high safety risk, but also delays the construction period. In addition, in the process of erecting the main cable and installing the auxiliary cable saddle, the main cable saddle needs to be pushed in both directions, and reaction frames for pushing jacks need to be set at both ends of the grid, which is a relatively complicated process. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a cable-clamp-type auxiliary saddle installation method based on an assembled temporary saddle. The method utilizes the structural characteristics of the suspension bridge itself, avoids the generation of additional internal forces on the main tower and auxiliary tower and the two-way pushing of the main saddle, and facilitates the adjustment of the cable strand verticality, which is safer and more reliable, and reduces the safety risks in the entire construction process.

[0006] The technical solution of the present invention is: a method for installing a cable clamp-type auxiliary saddle based on an assembled temporary saddle, comprising the following steps: S1: Structural construction, including main tower, auxiliary tower and anchorage; S2: Install the main cable saddle on the main tower and the assembled temporary cable saddle on the auxiliary tower; S3: Based on the main saddle and the assembled temporary saddle, the cable strands are erected and the sag adjustment of the cable strands is completed to form the main cable, and the cable is tightened and the cable clamp is installed; S4: hoist the stiffening beam in the middle of the middle span, and then push it toward the middle of the span with the main cable saddle to drive the main cable side span to rise to the set height; S5: Remove the assembled temporary saddle from under the main cable and install the lower half of the auxiliary saddle of the cable clamp type; S6: The side span of the auxiliary tower is hoisted with stiffening beams, and the side span of the main cable is lowered to the lower half of the cable clamp-type auxiliary saddle. The upper half of the cable clamp-type auxiliary saddle is installed and the main cable is fixed.

[0007] In step S3, the specific process of installing the cable strands based on the main saddle and the assembled temporary saddle and completing the cable strand sag adjustment is as follows: a steel partition is set in the assembled temporary saddle to longitudinally constrain the cable strands, and after the cable strands are installed, wedges are set between the steel partitions in the main saddle and the assembled temporary saddle, and the corresponding marking points of the cable strands are fixed, and the cable strand sag adjustment is completed in the order of the middle span, the side span from the main tower to the auxiliary tower section, and the side span from the auxiliary tower to the anchor section, so that the cable strand reaches the linear shape required by the design.

[0008] In step S4, the specific process of driving the cable strand side span to be lifted to the set height is as follows: after the cable strand is erected to form the main cable, the cable is tightened, and the cable clamp is installed, the stiffening beam is hoisted in the middle span until the pressure of the main cable of the side span on the assembled temporary saddle approaches 0, and then the main cable saddle is pushed toward the mid-span to lift the main cable side span to the set height. The set height reserves operating space for removing the assembled temporary saddle below and installing the lower half saddle body of the cable clamp-type auxiliary saddle.

[0009] In the step S5, the specific process of removing the assembled temporary saddle from under the main cable and installing the lower half of the saddle body of the cable clamp-like auxiliary saddle is as follows: after the main cable is lifted, the bolt connections between the assembled temporary saddle base and the support assembly and between the side plates of the assembled temporary saddle body are released in sequence, the tension bolt connections between the side plates of the saddle body on both sides of the assembled temporary saddle are released, and the assembled temporary saddle base, the side plates of the assembled temporary saddle body and the partition are pulled out from under the main cable to complete the removal of the assembled temporary saddle, and then the lower half of the saddle body of the cable clamp-like auxiliary saddle is installed using the tower top gantry.

[0010] In the step S6, the specific process of installing the upper saddle body of the cable-clamp type auxiliary saddle is as follows: after completing the replacement of the lower saddle body of the cable-clamp type auxiliary saddle, the stiffening beam is hoisted on the side span of the auxiliary tower, so that the main cable falls on the lower saddle body of the cable-clamp type auxiliary saddle under the action of the deadweight of the stiffening beam. At this time, the upper saddle body of the cable-clamp type auxiliary saddle is installed through the tower top gantry and tightened with bolts to complete the fixation of the main cable.

[0011] The technical effects of the present invention are as follows: 1. The present invention first completes the installation and construction of the main tower and the auxiliary tower according to the normal construction process, installs the main saddle and the assembled temporary saddle, and then installs the main cable strand based on the assembled temporary saddle and completes the vertical adjustment of the strand to form the main cable, tighten the cable and install the cable clamp. Then, the stiffening beam is hoisted in the middle span. When the pressure transmitted by the main cable to the assembled temporary saddle is close to 0, the main cable is pushed toward the mid-span direction to lift the main cable to the set height, the assembled temporary saddle is removed and the lower half saddle of the cable clamp-type auxiliary saddle is installed. At this time, the main cable is dropped to the inside of the lower half saddle of the cable clamp-type auxiliary saddle through the side span of the auxiliary tower, and then the upper half saddle is installed to complete the installation of the cable clamp-type auxiliary saddle. The entire construction process is simple and convenient, and there is no need to install the top segment of the auxiliary tower later, so the construction efficiency can be greatly improved; 2. The present invention installs an assembled temporary saddle on the top of the auxiliary tower, and a steel partition is provided inside the saddle to longitudinally constrain the main cable strand. After the cable strand is installed, Wedges are set in the steel partitions of the main cable saddle and the assembled temporary cable saddle to fix the corresponding marking points of the cable strands, and the vertical adjustment of the cable strands is completed in the order of the middle span, the side span from the main tower to the auxiliary tower section, and the side span from the auxiliary tower to the anchor section. The overall cable strand erection process is simple and fast, and the linear shape is accurate, which can accurately ensure the stress state of the overall structure in the later stage; 3. After the cable strands are erected, the cables are tightened and the cable clamps are installed, the stiffening beam is hoisted in the middle span until the pressure transmitted by the main cable of the side span to the assembled temporary cable saddle is close to 0, and then the main cable saddle is pushed toward the mid-span direction to lift the side span of the main cable to the set height, so as to reserve enough space for removing the assembled temporary saddle below and installing the lower half saddle body of the cable clamp-type auxiliary saddle. The entire main cable lifting process utilizes the characteristics of the structure itself. The pressure transmitted downward by the main cable at the assembled temporary saddle is gradually reduced as the mid-span stiffening beam is hoisted. The overall process will neither generate additional stress on the main tower and the auxiliary tower, nor is there any need to set up additional jacks and other equipment before and after the assembled temporary saddle to assist in lifting the main cable, thereby greatly reducing the construction difficulty and safety risks. 4. After the main cable is lifted, the present invention releases the bolt connections between the assembled temporary saddle base and the support assembly, and between the saddle side plates, releases the tension bolt connections between the saddle side plates on both sides of the assembled temporary saddle, and pulls out the assembled temporary saddle base, saddle side plates and partitions from under the main cable, and then replaces the lower half of the saddle with a cable-clamp-type auxiliary saddle.The overall replacement process of the assembled temporary saddle and the cable-clamp type auxiliary saddle is simple and clear, and the operation is convenient; 5. After completing the replacement of the lower saddle body of the cable-clamp type auxiliary saddle, the present invention hoists the stiffening beam on the side span of the auxiliary tower, so that the main cable slowly falls on the lower saddle body of the cable-clamp type auxiliary saddle under the action of its own weight. At this time, the upper saddle body of the cable-clamp type auxiliary saddle is installed and tightened with bolts to complete the fixation of the main cable. The overall construction conforms to the stress characteristics of the structure, helps to maintain the performance of the structure and has low construction difficulty; 6. The construction method provided by the present invention utilizes the characteristics of the suspension bridge structure itself, reduces the construction difficulty of the cable-clamp type auxiliary saddle of the super-long side cable suspension bridge, and facilitates the installation of the cable strands by setting the assembled temporary saddles, and realizes the vertical adjustment of the cable strands. Then, the stiffening beam is hoisted in the middle span and the main cable saddle is pushed toward the middle of the span to separate the main cable from the assembled temporary cable saddle, and the assembled temporary cable saddle and the cable-clamp-type auxiliary saddle are replaced. Finally, the stiffening beam is hoisted through the side span of the auxiliary tower to make the main cable fall back to complete the fixation of the main cable by the cable-clamp-type auxiliary saddle. The overall process is safe, reliable and extremely convenient, and has great promotion value.

[0012] The following is a further description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a flowchart of a method for installing a cable-clip-type auxiliary saddle based on an assembled temporary saddle according to an embodiment of the present invention.

[0014] Figure 2 Schematic diagram of the main cable saddle according to an embodiment of the present invention.

[0015] Figure 3 It is a schematic diagram of an assembled temporary saddle according to an embodiment of the present invention.

[0016] Figure 4 It is a schematic diagram of a cable clamp type auxiliary cable saddle according to an embodiment of the present invention.

[0017] Figure 5 It is a schematic diagram of cable strand installation and cable clamp installation according to an embodiment of the present invention.

[0018] Figure 6 It is a schematic diagram of lifting the side span main cable by pushing the span hanging beam and the cable saddle in an embodiment of the present invention.

[0019] Figure 7 It is a schematic diagram of removing the assembled temporary saddle and installing the lower half of the saddle body of the cable clamp-type auxiliary saddle according to an embodiment of the present invention.

[0020] Figure 8 It is a schematic diagram of the main cable of the side span suspension beam falling to the lower half of the auxiliary saddle according to an embodiment of the present invention.

[0021] Fig. 9 It is a schematic diagram of the main cable being lowered and the upper half of the saddle body of a cable-clamp-type auxiliary saddle being installed in an embodiment of the present invention.

[0022] Figure numerals: 1-main tower; 2-auxiliary tower; 3-main cable saddle; 4-assembled temporary cable saddle; 5-lower saddle body of cable clamp type auxiliary cable saddle; 6-upper saddle body of cable clamp type auxiliary cable saddle; 7-cable strand; 8-stiffening beam. DETAILED DESCRIPTION Example 1

[0023] like Figures 1 to 9 As shown, a method for installing a cable-clip-type auxiliary saddle based on an assembled temporary saddle comprises the following steps: S1: Structural construction, including main tower 1, auxiliary tower 2 and anchorage; S2: Install the main cable saddle 3 on the main tower 1 and install the assembled temporary cable saddle 4 on the auxiliary tower 2; S3: Based on the main cable saddle 3 and the assembled temporary cable saddle 4, the cable strand 7 is erected and the vertical adjustment of the cable strand 7 is completed to form the main cable, and the cable is tightened and the cable clamp is installed; S4: hoist the stiffening beam 8 in the middle of the middle span, and then push the main cable saddle 3 toward the middle of the span to drive the main cable side span to rise to the set height; S5: remove the assembled temporary saddle 4 from below the main cable, and install the lower half saddle body 5 of the cable clamp type auxiliary saddle; S6: The side span of the auxiliary tower 2 is hoisted with the stiffening beam 8, the side span of the main cable is lowered to the lower half saddle body 5 of the cable clamp type auxiliary saddle, the upper half saddle body 6 of the cable clamp type auxiliary saddle is installed and the main cable is fixed.

[0024] In step S3, the specific process of installing the cable strand 7 based on the main saddle 3 and the assembled temporary saddle 4 and completing the vertical adjustment of the cable strand 7 is as follows: a steel partition is arranged in the assembled temporary saddle 4 to longitudinally constrain the cable strand 7; after the cable strand 7 is installed, a wedge is arranged between the steel partitions in the main saddle 3 and the assembled temporary saddle 4, and the corresponding marking points of the cable strand 7 are fixed, and the vertical adjustment of the cable strand 7 is completed in the order of the middle span, the side span from the main tower 1 to the auxiliary tower 2, and the side span from the auxiliary tower 2 to the anchorage section, so that the cable strand 7 reaches the linear shape required by the design.

[0025] In step S4, the specific process of driving the main cable side span to be lifted to the set height is as follows: after the cable strands 7 are erected to form the main cable, the cable is tightened and the cable clamp is installed, the stiffening beam 8 is hoisted in the middle span until the pressure of the main cable of the side span on the assembled temporary saddle 4 approaches 0, and then the main saddle 3 is pushed toward the mid-span to lift the main cable side span to the set height. The set height reserves operating space for removing the assembled temporary saddle 4 and installing the lower half saddle body 5 of the cable clamp-type auxiliary saddle.

[0026] In the step S5, the specific process of removing the assembled temporary saddle 4 from under the main cable and installing the lower half saddle body 5 of the cable clamp-like auxiliary saddle is as follows: after the main cable is lifted, the bolt connections between the base of the assembled temporary saddle 4 and the support assembly and between the side plates of the saddle body of the assembled temporary saddle 4 are released in sequence, the tension bolt connections between the side plates of the saddle body on both sides of the assembled temporary saddle 4 are released, and the base of the assembled temporary saddle 4, the side plates of the saddle body of the assembled temporary saddle 4 and the partition are pulled out from under the main cable to complete the removal of the assembled temporary saddle 4, and then the lower half saddle body 5 of the cable clamp-like auxiliary saddle is installed using the tower top gantry.

[0027] In the step S6, the specific process of installing the upper saddle body 6 of the cable-clamp type auxiliary saddle is: after completing the replacement of the lower saddle body 5 of the cable-clamp type auxiliary saddle, the stiffening beam 8 is hoisted on the side span of the auxiliary tower 2, so that the main cable falls on the lower saddle body 5 of the cable-clamp type auxiliary saddle under the action of the deadweight of the stiffening beam 8, and at this time, the upper saddle body 6 of the cable-clamp type auxiliary saddle is installed through the tower top gantry and tightened with bolts to complete the fixation of the main cable.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for installing a cable clamp-type auxiliary saddle based on an assembled temporary saddle, characterized in that: The following steps are involved: S1: Structural construction, including the main tower (1), auxiliary tower (2) and anchorage; S2: installing a main cable saddle (3) on the main tower (1) and installing an assembled temporary cable saddle (4) on the auxiliary tower (2); S3: Based on the main cable saddle (3) and the assembled temporary cable saddle (4), the cable strand (7) is erected and the vertical adjustment of the cable strand (7) is completed to form the main cable, and the cable is tightened and the cable clamp is installed; S4: hoisting the stiffening beam (8) in the middle of the middle span, and then pushing it toward the middle of the span with the main cable saddle (3), driving the main cable side span to be lifted to the set height; S5: Remove the assembled temporary saddle (4) from below the main cable, and install the lower half saddle body (5) of the cable clamp-type auxiliary saddle; S6: The side span of the auxiliary tower (2) is hoisted with a stiffening beam (8), the side span of the main cable is lowered to the lower half saddle body (5) of the cable clamp type auxiliary saddle, the upper half saddle body (6) of the cable clamp type auxiliary saddle is installed, and the main cable is fixed.

2. According to claim 1, a method for installing a cable-clip-type auxiliary saddle based on an assembled temporary saddle, characterized in that: In step S3, the specific process of erecting the cable strand (7) based on the main cable saddle (3) and the assembled temporary cable saddle (4) and completing the vertical adjustment of the cable strand (7) is as follows: a steel partition is arranged in the assembled temporary cable saddle (4) to longitudinally constrain the cable strand (7); after the cable strand (7) is erected, a wedge is arranged between the steel partitions in the main cable saddle (3) and the assembled temporary cable saddle (4); the corresponding marking points of the cable strand (7) are fixed; and the vertical adjustment of the cable strand (7) is completed in the order of the middle span, the side span of the section from the main tower (1) to the auxiliary tower (2), and the side span of the section from the auxiliary tower (2) to the anchorage, so that the cable strand (7) reaches the linear shape required by the design.

3. According to claim 1, a method for installing a cable clamp-type auxiliary saddle based on an assembled temporary saddle, characterized in that: In step S4, the specific process of driving the main cable side span to be lifted to the set height is as follows: after the cable strands (7) are erected to form the main cable, the cable is tightened and the cable clamp is installed, the stiffening beam (8) is hoisted in the middle span until the pressure of the main cable of the side span on the assembled temporary saddle (4) tends to 0, and then the main saddle (3) is pushed toward the mid-span direction to lift the main cable side span to the set height. The set height reserves operating space for removing the assembled temporary saddle (4) and installing the lower half saddle body (5) of the cable clamp-type auxiliary saddle.

4. According to claim 1, a method for installing a cable clamp-type auxiliary saddle based on an assembled temporary saddle, characterized in that: In step S5, the specific process of removing the assembled temporary saddle (4) from below the main cable and installing the lower half saddle body (5) of the cable clamp-type auxiliary saddle is as follows: after the main cable is lifted, the bolt connections between the base of the assembled temporary saddle (4) and the support assembly and between the saddle body side plates of the assembled temporary saddle (4) are sequentially released, the tension bolt connections between the saddle body side plates on both sides of the assembled temporary saddle (4) are released, and the base of the assembled temporary saddle (4), the saddle body side plates of the assembled temporary saddle (4) and the partition are pulled out from below the main cable to complete the removal of the assembled temporary saddle (4), and then the lower half saddle body (5) of the cable clamp-type auxiliary saddle is installed again using the tower top gantry.

5. According to claim 1, a method for installing a cable-clip-type auxiliary saddle based on an assembled temporary saddle, characterized in that: In the step S6, the specific process of installing the upper saddle body (6) of the cable clamp type auxiliary saddle is as follows: after the lower saddle body (5) of the cable clamp type auxiliary saddle is replaced, the stiffening beam (8) is hoisted on the side span of the auxiliary tower (2), so that the main cable falls on the lower saddle body (5) of the cable clamp type auxiliary saddle under the action of the deadweight of the stiffening beam (8), and at this time, the upper saddle body (6) of the cable clamp type auxiliary saddle is installed through the tower top gantry and tightened with bolts to complete the fixing of the main cable.

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