Construction method of main cable at secondary cable saddle in the form of cable clip based on pre-bias of main cable saddle

Abstract

The application relates to the technical field of bridge construction, in particular to a main cable construction method for a vice cable saddle in the form of a cable clamp based on pre-deviation of a main cable saddle. The method comprises the following steps: S1, constructing a main tower, a vice tower and an anchor, erecting a main cable based on the main tower, and installing the main cable on the main cable saddle on the main tower; S2, driving the main cable saddle to move towards the middle span, moving the middle-span part of the main cable downwards and the side-span part of the main cable upwards to a set height; S3, installing a vice cable saddle on the top of the vice tower, driving the main cable saddle to reset towards the side span, and connecting the side-span part of the main cable with the vice cable saddle until the side-span part of the main cable falls into the vice cable saddle. The construction method is very simple, the construction difficulty of a complex suspension bridge is reduced, the side-span part of the main cable is lifted by pushing the main cable saddle in the bridge direction, the quick installation of the vice cable saddle is facilitated, the side-span part of the main cable is adjusted back by reversely pushing the main cable saddle in the bridge direction, the connection of the vice cable saddle and the side-span part of the main cable is facilitated, and the overall construction is extremely convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, in particular to a main cable construction method based on pre-offset main cable saddle and cable clamp type secondary cable saddle. BACKGROUND

[0002] In recent years, the construction of suspension bridges in China is in full swing. With the continuous progress of science and technology, the application of new technology, new process and new material, long-span suspension bridges have developed rapidly. Among them, the main cable, as the main load-bearing component of the suspension bridge structure, is known as the "lifeline" of the suspension bridge. Therefore, the main cable construction is the most important part of the construction of the suspension bridge, and the main cable construction process mainly includes main cable erection, cable tightening, cable clamp and sling installation, main cable wire winding, etc. However, with the continuous breakthrough of the span of the suspension bridge, the existing part of the main cable construction technology in China cannot meet the construction needs of the super-long-span suspension bridge.

[0003] For the super-long side cable of the super-long-span suspension bridge, in order to meet the requirements of structural stress and linear, a corresponding support structure is usually set at the side span to increase the overall stiffness of the bridge. Generally, a secondary tower is set at the side span to transfer the vertical force of the main cable, so the secondary tower often bears a large pressure. The secondary cable saddle can be set in the form of a cable clamp, that is, the diameter of the cable clamp is the diameter of the main cable in the completed bridge state. However, there is an air gap of 18% to 20% before and after the main cable tightening operation, and the diameter of the main cable before tightening is much larger than the diameter of the secondary cable saddle. Therefore, it is impossible to put all the main cable strands directly into the secondary cable saddle during the strand erection stage, and it will be very difficult to carry out strand adjustment and tightening operations under a large pressure. At present, there is no suitable main cable construction method for the secondary cable saddle of the super-long-span suspension bridge in China, so it is urgent to propose a main cable construction method for the secondary cable saddle in the form of a cable clamp to solve this problem. SUMMARY

[0004] The purpose of the present application is to solve the problems in the background art, and to provide a main cable construction method based on pre-offset main cable saddle and cable clamp type secondary cable saddle.

[0005] The technical scheme of the present application is as follows: a main cable construction method based on pre-offset main cable saddle and cable clamp type secondary cable saddle, comprising the following steps:

[0006] S1, constructing the main tower, the secondary tower and the anchorage, erecting the main cable based on the main tower, and installing the main cable on the main cable saddle on the main tower;

[0007] S2, driving the main cable saddle to move towards the midspan, moving the midspan part of the main cable downward and the side span part of the main cable upward to a set height;

[0008] S3, installing the secondary cable saddle on the top of the secondary tower, driving the main cable saddle to reset to the side span, and connecting the side span part of the main cable with the secondary cable saddle until the side span part of the main cable falls into the secondary cable saddle.

[0009] According to the main cable construction method based on the pre-bias of the main cable saddle and the cable clamp type auxiliary cable saddle provided in the application, in step S2, the method for driving the main cable saddle to move to the middle span to make the edge span part of the main cable move upward to the set height comprises: pushing the main cable saddle along the bridge direction to move to the middle span until the edge span part of the main cable above the auxiliary tower is higher than the lower saddle body of the auxiliary cable saddle.

[0010] According to the main cable construction method based on the pre-bias of the main cable saddle and the cable clamp type auxiliary cable saddle provided in the application, in step S3, the method for installing the auxiliary cable saddle on the top of the auxiliary tower comprises: installing the lower saddle body of the auxiliary cable saddle on the top of the auxiliary tower, and then installing the upper saddle body of the auxiliary cable saddle on the lower saddle body after the edge span part of the main cable enters the lower saddle body.

[0011] According to the main cable construction method based on the pre-bias of the main cable saddle and the cable clamp type auxiliary cable saddle provided in the application, in step S3, the method for driving the main cable saddle to move to the edge span comprises: reversely pushing the main cable saddle along the bridge direction to move to the side of the edge span until the edge span part of the main cable is at the design elevation.

[0012] According to the main cable construction method based on the pre-bias of the main cable saddle and the cable clamp type auxiliary cable saddle provided in the application, in step S3, the method for connecting the edge span part of the main cable with the auxiliary cable saddle comprises: after the edge span part of the main cable reaches the design elevation, installing the upper saddle body of the auxiliary cable saddle on the lower saddle body of the auxiliary cable saddle, tightening the nut, and clamping and fixing the edge span part of the main cable between the lower saddle body and the upper saddle body of the auxiliary cable saddle.

[0013] The application has the following advantages: 1. According to the application, the main tower and the auxiliary tower are constructed according to the normal design elevation. When the auxiliary cable saddle of the auxiliary tower is installed, the main cable saddle is pushed along the bridge direction to move downward, and the edge span part of the main cable is moved upward, so that the installation space is reserved for the installation of the auxiliary cable saddle, the installation of the lower saddle body of the auxiliary cable saddle is facilitated, the installation of the lower saddle body of the auxiliary cable saddle leaves enough space, the entire installation process does not interfere with the edge span part of the main cable, then the main cable saddle is adjusted to make the edge span part of the main cable fall to the lower saddle body of the auxiliary cable saddle, the upper saddle body of the auxiliary cable saddle is quickly installed, the entire construction method is simple and smooth, the construction difficulty of the main cable of the complex suspension bridge is greatly reduced, the construction efficiency is greatly improved, and the application has great popularization value.

[0014] 2. After the main cable and the main cable saddle are erected, the edge span part of the main cable is lifted by pushing the main cable saddle, so that the part of the edge span part of the main cable on the auxiliary tower is lifted to be higher than the lower saddle body of the auxiliary cable saddle, enough space is reserved for the installation of the lower saddle body of the auxiliary cable saddle, the quick installation of the lower saddle body of the auxiliary cable saddle is facilitated, the lower saddle body of the auxiliary cable saddle does not interfere with the edge span part of the main cable, the overall construction is extremely simple, and the construction difficulty is greatly reduced.

[0015] 3、The installation of the auxiliary cable saddle is carried out in steps in the application, that is, the lower saddle body of the auxiliary cable saddle is installed first, and then the installation of the upper saddle body of the auxiliary cable saddle is carried out after the completion of the back adjustment of the side span part of the main cable, and the installation of the upper saddle body of the auxiliary cable saddle simultaneously realizes the fixed connection between the side span part of the main cable and the auxiliary cable saddle, the overall construction is simple and orderly, the construction process is less, and the efficiency of erecting the main cable on the auxiliary tower is greatly improved;

[0016] 4、After the installation of the lower saddle body of the auxiliary cable saddle is completed, the main cable saddle is pushed in the reverse direction along the bridge to make the originally lifted side span part of the main cable back down, and when the side span part of the main cable back down to the design elevation, the side span part of the main cable does not produce downward pressure at this time, which is convenient for the subsequent installation of the upper saddle body of the auxiliary cable saddle, the connection between the side span part of the main cable and the auxiliary cable saddle is smooth, the stress structure is clear, and the rapid installation of the auxiliary cable saddle is greatly facilitated;

[0017] 5、The construction of connecting the auxiliary cable saddle and the side span part of the main cable is extremely convenient, the side span part of the main cable is back down to the design elevation, and then the installation of the upper saddle body of the auxiliary cable saddle is carried out, the lower saddle body of the auxiliary cable saddle and the upper saddle body of the auxiliary cable saddle clamp the side span part of the main cable therebetween, at this time, only the bolts between the lower saddle body of the auxiliary cable saddle and the upper saddle body of the auxiliary cable saddle need to be tightened, and the connection process between the auxiliary cable saddle and the side span part of the main cable can be completed, the overall operation is simple, and the construction difficulty is small.

[0018] The construction method of the application is very simple, which reduces the construction difficulty of the complex suspension bridge, the main cable saddle is pushed in the bridge direction to complete the lifting of the side span part of the main cable, which is convenient for the rapid installation of the lower saddle body of the auxiliary cable saddle, and then the main cable saddle is pushed in the reverse direction along the bridge to make the side span part of the main cable back down, which is convenient for the installation of the upper saddle body of the auxiliary cable saddle and the connection between the auxiliary cable saddle and the side span part of the main cable, the overall construction is extremely convenient, the construction efficiency is greatly improved, and the application has great popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The schematic view of the main cable saddle moving to the midspan pre-offset of the application;

[0020] Figure 2 The schematic view of the auxiliary cable saddle installation structure of the application;

[0021] Figure 3 The schematic view of the main cable saddle moving to the side span reset of the application;

[0022] Figure 4 The schematic view of the main cable side span part falling into the auxiliary cable saddle of the application;

[0023] Wherein: 1-main tower; 2-auxiliary tower; 3-anchor; 4-main cable midspan part; 5-main cable side span part; 6-auxiliary cable saddle. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described below in detail, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0025] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0027] The present application will be further described below in detail in conjunction with the drawings and specific embodiments.

[0028] The present application relates to a main cable construction method based on a main cable saddle pre-bias type secondary cable saddle form cable clamp, as shown in Figure 1 and 3 The suspension bridge structure of the present application includes a main tower 1, a secondary tower 2, a main cable and an anchor 3. The main cable between the main tower 1 and the main tower 1 is the midspan portion, and the main cable between the main tower 1 and the anchor 3 on the same side is the side span portion. The construction of the suspension bridge is to construct the bridge tower first, i.e. the main tower 1 and the secondary tower 2, and then to erect the main cable. The main cable is first connected to the main cable saddle on the main tower 1, and then connected to the secondary cable saddle 6 on the secondary tower 2 to complete the erection of the main cable. The difficulty of the suspension bridge construction involving the secondary tower 2 lies in the interference problem of the connection of the main cable side span portion 5 and the secondary cable saddle 6 on the secondary tower 2. The present application fully considers the structural characteristics of the suspension bridge and proposes a new solution to the above problem.

[0029] The specific construction method comprises the following steps:

[0030] S1, constructing the main tower 1, the secondary tower 2 and the anchor 3, erecting the main cable based on the main tower 1, and installing the main cable on the main cable saddle on the main tower 1;

[0031] After the main tower 1, the auxiliary tower 2 and the anchorage 3 are completed, the main cable is erected, and the two ends of the main cable are fixedly connected with the anchorage 3 on the two banks, the main cable comprises a main cable midspan portion 4 located between the two groups of main towers 1 and a main cable side span portion 5 located between the main tower 1 and the anchorage 3;

[0032] The top of the main tower 1 is provided with a main cable saddle, and the main cable is fixedly connected with the main cable saddle.

[0033] S2, drive the main cable saddle to move to the midspan, so that the main cable midspan portion 4 moves downward and the main cable side span portion 5 moves upward to a set height, as shown in Figure 1 .

[0034] Driving the main cable saddle to move to the midspan along the bridge longitudinal direction is equivalent to changing the bridge longitudinal distance between the main cable saddle and the anchorage 3 on the same side, tensioning the main cable side span portion 5, lifting the main cable side span portion 5, and moving the main cable midspan portion downward, when the main cable side span portion 5 is lifted upward to a set height, that is, the height at which the auxiliary cable saddle 6 is conveniently installed, the height at which interference with the installation of the auxiliary cable saddle 6 is avoided.

[0035] S3, install the auxiliary cable saddle 6 on the top of the auxiliary tower 2, drive the main cable saddle to reset to the side span, and until the main cable side span portion 5 falls into the auxiliary cable saddle 6, and the main cable side span portion 5 is connected with the auxiliary cable saddle 6, as shown in Figures 2 to 4 .

[0036] In step S2, the main cable side span portion 5 has been lifted to a height at which interference with the installation of the auxiliary cable saddle 6 is avoided, the main cable side span portion 5 is above the auxiliary tower 2, and a space is left between the main cable side span portion 5 and the top of the auxiliary tower 2 for the installation of the auxiliary cable saddle 6, after the installation of the auxiliary cable saddle 6 is completed, the main cable saddle is adjusted in the reverse direction, the main cable side span portion 5 is adjusted downward, falls into the auxiliary cable saddle 6, the auxiliary cable saddle 6 is connected with the main cable side span portion 5, and the construction work of the main cable and the auxiliary cable saddle 6 can be completed.

[0037] The construction method of the application fully considers the difficulty of constructing the main cable of the suspension bridge with the auxiliary tower structure, realizes the lifting and adjustment of the main cable side span portion 5 through the pre-bias of the main cable saddle, facilitates the rapid installation of the auxiliary cable saddle 6, facilitates the connection of the auxiliary cable saddle 6 and the main cable side span portion 5, reduces the construction difficulty of the connection of the main cable and the auxiliary cable saddle 6, improves the construction efficiency, and the overall construction is extremely simple.

[0038] In some embodiments of the application, the step S2 described above is optimized, and specifically, in the step S2, the method for driving the main cable saddle to move to the midspan to move the main cable side span portion 5 upward to a set height is as shown in Figure 1 , that is, the main cable saddle is pushed along the bridge longitudinal direction to move to the midspan, until the main cable side span portion 5 above the auxiliary tower 2 is higher than the lower saddle body of the auxiliary cable saddle 6.

[0039] The purpose of moving the pushing main cable saddle along the bridge direction to the midspan is to tension the main cable side span part 5, lift the main cable side span part 5 above the auxiliary tower 2, reserve the installation space of the lower saddle body of the auxiliary cable saddle 6 at the top of the auxiliary tower 2, avoid the main cable side span part 5 from occupying the installation space of the lower saddle body of the auxiliary cable saddle 6, and thus affect the installation of the lower saddle body of the auxiliary cable saddle 6. Therefore, in the embodiment, the main cable saddle is pushed to the midspan, and the main cable side span part 5 above the auxiliary tower 2 is lifted to a height higher than that of the lower saddle body of the auxiliary cable saddle 6.

[0040] In the embodiment, the pushing of the main cable saddle (not shown in the figure) can be realized by arranging a slide and a bridge direction pushing jack at the top of the main tower 1 in advance, and the main cable saddle is slidably connected with the slide. When the main cable saddle needs to be pushed, the main cable saddle is pushed by the pushing jack along the slide to the required position along the bridge direction, and after the tensioning operation of the main cable and the auxiliary cable saddle 6 is completed, the main cable saddle can be locked in the slide.

[0041] In another embodiment of the present application, the step S3 is optimized. In the step S3, the method for installing the auxiliary cable saddle 6 at the top of the auxiliary tower 2 is as follows: as shown in Figure 2 the lower saddle body of the auxiliary cable saddle 6 is installed at the top of the auxiliary tower 2, and then the upper saddle body of the auxiliary cable saddle 6 is installed on the lower saddle body of the auxiliary cable saddle 6 after the main cable side span part 5 enters the lower saddle body of the auxiliary cable saddle 6.

[0042] The auxiliary cable saddle 6 of the embodiment is installed in steps, that is, after the main cable side span part 5 is lifted to a set height, the installation space of the lower saddle body of the auxiliary cable saddle 6 is left at the top of the auxiliary tower 2, and the installation of the lower saddle body of the auxiliary cable saddle 6 can be performed at this time. After the main cable side span part 5 is adjusted back, the installation of the upper saddle body of the auxiliary cable saddle 6 can be performed. The whole construction process is orderly and efficient, and the stress between the auxiliary cable saddle 6 and the main cable side span part 5 is fully considered to ensure that the whole installation process can be quickly performed.

[0043] In a further embodiment of the present application, the step S3 is optimized. Specifically, in the step S3, the method for driving the main cable saddle to return to the side span is as follows: as shown in Figure 3 the main cable saddle is reversely pushed along the bridge direction to move the main cable saddle to the side span side until the main cable side span part 5 is at the design elevation.

[0044] After the installation of the lower saddle body of the secondary cable saddle 6 is completed, the main cable saddle can be pushed in the opposite direction, and the main cable saddle moves along the same side of the anchor 3, changes the distance between the main cable saddle and the anchor 3 on the same side, and the side span part 5 of the main cable moves downward. When the side span part 5 of the main cable is adjusted downward to the design elevation, the design elevation refers to the design elevation of the side span part 5 of the main cable in the empty cable state, and at this time, the side span part 5 of the main cable does not generate downward pressure, and the side span part 5 of the main cable does not generate downward pressure on the secondary cable saddle 6, facilitating the subsequent installation process of the upper saddle body of the secondary cable saddle 6. When the side span part 5 of the main cable reaches the design elevation, the subsequent installation of the upper saddle body of the secondary cable saddle 6 is very smooth, and does not interfere with the side span part 5 of the main cable, and the overall installation and connection process is extremely simple.

[0045] In the preferred embodiment of the present application, the step S3 is further optimized, and specifically, in the step S3, the method for connecting the side span part 5 of the main cable and the secondary cable saddle 6 is as follows: Figure 4 After the side span part 5 of the main cable reaches the design elevation, the upper saddle body of the secondary cable saddle 6 is installed on the lower saddle body of the secondary cable saddle 6, and the nut is tightened to clamp and fix the side span part 5 of the main cable between the lower saddle body of the secondary cable saddle 6 and the upper saddle body of the secondary cable saddle 6.

[0046] The lower saddle body of the secondary cable saddle 6 and the upper saddle body of the secondary cable saddle 6 form a cable clamp structure that is sleeved on the side span part 5 of the main cable. When the side span part 5 of the main cable reaches the design elevation, the lower saddle body of the secondary cable saddle 6 does not generate downward pressure, and at this time, the upper saddle body of the secondary cable saddle 6 is installed on the lower saddle body of the secondary cable saddle 6 and the side span part 5 of the main cable. It becomes very simple, the upper saddle body of the secondary cable saddle 6 does not interfere with the side span part 5 of the main cable, facilitates the alignment between the upper saddle body of the secondary cable saddle 6 and the lower saddle body of the secondary cable saddle 6, and the bolt is tightened to fasten the side span part 5 of the main cable between the lower saddle body of the secondary cable saddle 6 and the upper saddle body of the secondary cable saddle 6. The installation and construction of the main cable on the secondary cable saddle 6 is completed.

[0047] In actual construction, the main tower 1, the auxiliary tower 2 and the anchor 3 are first constructed, the main cable saddle is arranged on the top of the main tower 1, then the main cable is erected, the two ends of the main cable are fixedly connected with the anchors 3 on the two banks, the main cable is erected on the main cable saddle and fixedly connected with the main cable saddle; the main cable saddle is pushed in the bridge direction based on the pushing structure on the top of the main tower 1, and is pushed to one side of the midspan, so that the main cable is tensioned on the side span and lifted upwards, the side span part 5 of the main cable is lifted upwards to exceed the installation height of the lower saddle body of the auxiliary cable saddle 6 on the auxiliary tower 2; the lower saddle body of the auxiliary cable saddle 6 is installed on the auxiliary tower 2, after installation, the main cable saddle is reversely pushed in the bridge direction, so that the side span part 5 of the main cable is moved downwards until the side span part 5 of the main cable is moved to the design elevation in the empty cable state, at this time, the part of the side span part 5 of the main cable on the lower saddle body of the auxiliary cable saddle 6 falls into the lower saddle body of the auxiliary cable saddle 6; the upper saddle body of the auxiliary cable saddle 6 is installed on the lower saddle body of the auxiliary cable saddle 6, the side span part 5 of the main cable is clamped between the lower saddle body and the upper saddle body of the auxiliary cable saddle 6, the upper saddle body of the auxiliary cable saddle 6 is adjusted so that the screw holes on the upper saddle body of the auxiliary cable saddle 6 correspond to the screw holes on the lower saddle body of the auxiliary cable saddle 6 one by one, the bolts are inserted and tightened, so that the side span part 5 of the main cable is locked between the lower saddle body and the upper saddle body of the auxiliary cable saddle 6, and the connection between the main cable and the auxiliary cable saddle 6 is completed.

[0048] As Figure 1 shown, the bridge direction of the application refers to the left-right direction in the figure, and the vertical direction of the application refers to the up-down direction in the figure. Figure 1 Figure 1

[0049] The basic principles, main features and advantages of the application are shown and described above. It should be understood by those skilled in the art that the application is not limited by the above examples, the above examples and descriptions in the specification are only to illustrate the principles of the application, and various changes and improvements can be made without departing from the spirit and scope of the application, and these changes and improvements all fall within the scope of the claimed application. The scope of protection of the application is defined by the appended claims and their equivalents.​​

Claims

1. A construction method of a main cable at a secondary cable saddle in the form of a cable clip based on the pre-bias of the main cable saddle, the suspension bridge structure comprising a main tower, a secondary tower, a main cable and an anchor, the main cable between the main tower and the main tower being the midspan part, and the main cable between the main tower and the anchor on the same side being the side span part, characterized in that: The method comprises the following steps: S1, constructing a main tower, a vice tower and an anchor, erecting a main cable based on the main tower, and installing the main cable on a main cable saddle on the main tower; S2, driving the main cable saddle to move to the middle span, moving the middle span part of the main cable downward and the side span part of the main cable upward to a set height; S3, installing a vice cable saddle on the top of the vice tower, driving the main cable saddle to reset to the side span, and connecting the side span part of the main cable with the vice cable saddle.

2. A method for construction of a main cable at a secondary cable saddle in the form of a cable clip based on pre-bias of a main cable saddle, according to claim 1, characterized in that: In the step S2, the method for driving the main cable saddle to move to the middle span and moving the side span part of the main cable upward to a set height comprises: pushing the main cable saddle along the bridge direction to move to the middle span until the side span part of the main cable above the vice tower is higher than the lower saddle body of the vice cable saddle.

3. A method for construction of a main cable at a secondary cable saddle in the form of a cable clip based on pre-bias of a main cable saddle, according to claim 1, characterized in that: In the step S3, the method for installing the vice cable saddle on the top of the vice tower comprises: installing the lower saddle body of the vice cable saddle on the top of the vice tower, and then installing the upper saddle body of the vice cable saddle on the lower saddle body after the side span part of the main cable enters the lower saddle body.

4. The method according to claim 1, wherein the main cable construction method is characterized in that: In the step S3, the method for driving the main cable saddle to reset to the side span comprises: reversely pushing the main cable saddle along the bridge direction to move to the side span until the side span part of the main cable is at a design elevation.

5. A method of construction of a main cable with a secondary cable saddle in the form of a cable clip based on predeflection of the main cable saddle, according to claim 4, characterized in that: In the step S3, the method for connecting the side span part of the main cable with the vice cable saddle comprises: after the side span part of the main cable reaches the design elevation, installing the upper saddle body of the vice cable saddle on the lower saddle body of the vice cable saddle, tightening the nut, and clamping and fixing the side span part of the main cable between the lower saddle body and the upper saddle body of the vice cable saddle.

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