Construction method of main cable based on auxiliary cable saddle in the form of auxiliary tower back made cable clamp

Abstract

The application relates to the technical field of bridge construction, in particular to a main cable construction method based on a sub-tower rear-made sub-cable saddle of a cable clamp type. The method comprises the following steps: S1, after the main tower construction is completed, the sub-tower is constructed, and the construction is stopped at a set distance from the tower top; S2, the main cable is erected on the main tower and the anchorage, and the cable tightening process is completed; S3, the main cable midspan part between the two groups of main towers is ballasted, so that the main cable side span part between the main tower and the sub-tower is lifted upward to a set height; S4, the sub-tower construction is completed, the sub-cable saddle is installed on the sub-tower, and the main cable construction operation at the sub-cable saddle is carried out. The construction method is very simple, the construction difficulty of the complex suspension bridge is reduced, the erection of the main cable side span part can be provided with sufficient space through the step-by-step construction of the sub-tower, the main cable side span part is lifted through the ballasting of the main cable midspan part, the main cable side span part and the sub-tower can be conveniently installed, and the subsequent construction of the sub-tower is facilitated, and the construction efficiency is greatly improved.

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 a vice tower post-made cable clamp type vice 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. 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 vice tower is set at the side span to transfer the vertical force of the main cable, so the vice tower often bears a large pressure. The vice 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 vice cable saddle. Therefore, it is impossible to put all the main cable strands directly into the vice 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 vice cable saddle of the super-long-span suspension bridge in China, so it is urgent to propose a cable clamp type vice cable saddle main cable construction method 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 a vice tower post-made cable clamp type vice cable saddle.

[0005] The technical scheme of the present application is as follows: a main cable construction method based on a vice tower post-made cable clamp type vice cable saddle, comprising the following steps:

[0006] S1, after the main tower construction is completed, the vice tower is constructed, and the construction is stopped at a set distance from the tower top;

[0007] S2, the main cable is erected on the main tower and the anchorage, and the cable tightening process is completed;

[0008] S3, a downward pressure is applied to the middle part of the main cable between the two main towers, forcing the side span part of the main cable between the main tower and the vice tower to be lifted up to a set height;

[0009] S4, the vice tower construction is completed, the vice cable saddle is installed on the vice tower, and the main cable operation at the vice cable saddle is carried out.

[0010] According to the method for constructing the main cable at the auxiliary cable saddle in the form of a cable clamp based on the auxiliary tower provided in the application, in step S1, the method for stopping the construction of the auxiliary tower at a distance of 15-20 m from the top of the auxiliary tower comprises: stopping the construction of the auxiliary tower at a distance of 15-20 m from the top of the auxiliary tower.

[0011] According to the method for constructing the main cable at the auxiliary cable saddle in the form of a cable clamp based on the auxiliary tower provided in the application, in step S3, the method for applying vertical downward pressure to the main cable span portion between the two groups of main towers comprises: hoisting and constructing the mid-span beam section based on the main cable span portion, and applying vertical downward pressure to the main cable span portion by the mid-span beam section to force the main cable span portion to move downward.

[0012] According to the method for constructing the main cable at the auxiliary cable saddle in the form of a cable clamp based on the auxiliary tower provided in the application, in step S3, the method for forcing the main cable side span portion between the main tower and the auxiliary tower to rise upward to a set height comprises: forcing the main cable side span portion between the main tower and the auxiliary tower to rise upward to the design elevation.

[0013] The application has the following advantages: 1. When the main cable at the auxiliary cable saddle is constructed, the top of the auxiliary tower is not constructed, which facilitates the erection of the main cable side span portion, that is, the main cable side span portion does not interfere with the main cable side span portion during the erection of the main cable side span portion. When the main cable at the auxiliary cable saddle is constructed, downward pressure is applied to the main cable span portion to force the main cable side span portion to rise upward, which is very convenient for the overall adjustment of the main cable side span portion. After the main cable side span portion is lifted, the top of the auxiliary tower and the auxiliary cable saddle are constructed. At this time, the main cable side span portion does not interfere with the installation of the top of the auxiliary tower and the auxiliary cable saddle. The overall construction is very simple and orderly, which greatly improves the efficiency of the erection of the main cable and the construction of the auxiliary tower, reduces the construction difficulty of the complex suspension bridge structure, and has great popularization value.

[0014] 2. In the initial construction of the auxiliary tower, the auxiliary tower is constructed to a distance of 15-20 m from the top of the auxiliary tower and then stopped, and the construction of the auxiliary tower is not completed at one time. The auxiliary tower is constructed in steps. By constructing the auxiliary tower to a set height from the top of the auxiliary tower, enough space is reserved for the erection of the main cable side span portion, so that the erection of the main cable side span portion is not disturbed, the erection of the main cable is more convenient and efficient, and the overall construction difficulty is greatly reduced.

[0015] 3. The application applies downward pressure to the main cable span portion in a very simple way. The main cable span portion is loaded by hoisting the mid-span beam section. The mid-span beam section itself is a structure that needs to be constructed later. The hoisting and loading method is simple and can provide great convenience for subsequent beam section construction. The overall loading method is very simple and easy to operate.

[0016] 4. This application applies vertical ballast to the mid-span of the main cable, causing the mid-span of the main cable to move downwards. Naturally, the side span of the main cable will rise upwards. When the side span of the main cable rises to the design elevation, that is, when the side span of the main cable overlaps with the side span of the main cable under the condition of an empty cable, the side span of the main cable will not generate downward pressure. At the same time, there is enough space left with the current top position of the auxiliary tower construction, which facilitates the installation and construction of the remaining sections of the auxiliary tower and the installation of the auxiliary cable saddle. It also facilitates the subsequent assembly of the auxiliary cable saddle with the side span of the main cable. The overall construction is simple, the operation is convenient, and the construction efficiency is greatly improved.

[0017] The construction method described in this application is very simple, reducing the construction difficulty of complex suspension bridges. By constructing the secondary tower in stages, sufficient space can be provided for the erection of the main cable side span. Ballasting the main cable mid-span section raises the main cable side span section, which facilitates the installation of the main cable side span section and the secondary tower, as well as the subsequent construction of the secondary tower. The overall construction is extremely convenient, and the construction efficiency is greatly improved, making it of great promotional value. Attached Figure Description

[0018] Figure 1 This application includes a schematic diagram showing the distance from the top of the auxiliary tower to where it was constructed.

[0019] Figure 2 This application provides a schematic diagram of ballast application for the mid-span portion of the main cable.

[0020] Figure 3 This application includes a schematic diagram of the top portion of the auxiliary tower during construction.

[0021] Figure 4 This application includes a schematic diagram of the installation of the main cable side span and the auxiliary cable saddle.

[0022] Wherein: 1—Main tower; 2—Secondary tower; 3—Anchorage; 4—Main cable mid-span section; 5—Main cable side-span section; 6—Secondary cable saddle; 7—Mid-span beam section. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0025] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can include one or more of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0027] The present application relates to a kind of based on the form of cable clamp type cable saddle of vice tower after doing, such as Figures 1-3 As shown, the suspension bridge structure of the present application includes main tower, vice tower, main cable and beam body, the main cable between main tower and main tower is midspan portion, and the main cable between main tower and anchor on the same side is side span portion. The construction of suspension bridge is to construct bridge tower first, i.e. main tower and vice tower, then erect main cable, and then install beam body on main cable to complete the construction of suspension bridge. The difficulty of suspension bridge construction involving vice tower lies in the erection of main cable side span portion and the interference problem between main cable side span portion and vice cable saddle on vice tower. The present application fully considers the structural characteristics of suspension bridge and proposes a new solution to the above problems.

[0028] The specific construction method includes the following steps:

[0029] S1, after the construction of main tower 1 is completed, vice tower 2 is constructed, and the construction is stopped at a set distance from the tower top, as shown in Figure 1 ;

[0030] That is, the vice tower 2 of the present application is divided into two constructions, the first part of the lower half of the vice tower 2 is constructed, and the construction is stopped at the set position to reserve space for the erection of the subsequent main cable, so as to avoid interference between the main cable and the vice tower 2;

[0031] S2, erect main cable on main tower 1 and anchor 3, and complete the cable tightening process;

[0032] In the process of erecting the main cable, since the auxiliary tower 2 is not completely constructed to the design elevation, there is enough space above the existing part of the auxiliary tower 2, the side span part of the main cable naturally sags in the process of erection, and in fact is lower than the design elevation, and at this time the reserved space above the existing part of the auxiliary tower 2 is just used to accommodate the side span part 5 of the main cable, the side span part 5 of the main cable and the top of the existing part of the auxiliary tower 2 do not contact or interfere with each other, and do not affect the erection of the side span part 5 of the main cable.

[0033] S3, the midspan part 4 of the main cable between the two main towers 1 is ballasted to force the side span part 5 of the main cable between the main tower 1 and the auxiliary tower 2 to be lifted to a set height, as shown in Figure 2 .

[0034] The main cable is an integral structure, and the midspan part 4 and the side span part 5 of the main cable are an integral structure, when the midspan part 4 of the main cable is ballasted, the midspan part 4 of the main cable moves downward and is tensioned, the midspan part 4 of the main cable pulls the side span part 5 on both sides downward, and the main cable above the existing part of the auxiliary tower 2 is lifted upward, when the side span part 5 of the main cable is lifted to the set height, the next operation can be performed.

[0035] S4, the auxiliary tower 2 is completed, the auxiliary cable saddle 6 is installed on the auxiliary tower 2, and the main cable operation at the auxiliary cable saddle 6 is performed, as shown in Figure 3 and 4 .

[0036] When the side span part 5 of the main cable is lifted to the set height, the side span part 5 of the main cable reserves enough space for the construction of the remaining part of the auxiliary tower 2, so the second part of the auxiliary tower 2, i.e. the remaining section, can be continuously constructed, after the construction of the remaining section of the auxiliary tower 2 is completed, the auxiliary cable saddle 6 is installed on the auxiliary tower 2, and then the auxiliary cable saddle 6 is connected with the side span part 5 of the main cable.

[0037] The construction method of the application fully considers the difficulty of constructing the main cable of the suspension bridge with the auxiliary tower 2 structure, and the construction difficulty is greatly reduced and the construction efficiency is improved through the step-by-step construction of the auxiliary tower 2 and the ballasting of the midspan part 4 of the main cable, and the overall construction is extremely simple.

[0038] In some embodiments of the application, the step S1 is optimized, and specifically, in the step S1, the method for constructing the auxiliary tower 2 to stop at a set distance from the top of the tower is as shown in Figure 1 , that is, the auxiliary tower 2 is constructed to stop at 15m-20m from the top of the auxiliary tower 2.

[0039] The construction auxiliary tower 2 is located at a distance of 15-20 m from the top of the auxiliary tower 2. The space reserved above the first part of the auxiliary tower 2 after construction is sufficient for the erection of the main cable side span part 5, and does not cause any interference to the erection of the main cable side span part 5, which is extremely convenient for the erection of the main cable.

[0040] In actual application, the distance is not limited to 15-20 m, as long as the top of the first part of the auxiliary tower 2 is lower than the lowest point of the naturally sagging main cable side span part 5 after the main cable erection is completed, or in other words, the top of the first part of the auxiliary tower 2 is lower than the main cable side span part 5 above the auxiliary tower 2 after the main cable erection is completed, so as to ensure that the main cable side span part 5 and the first part of the auxiliary tower 2 are spaced in the vertical direction, and the first part of the auxiliary tower 2 does not contact the main cable side span part 5, and does not affect the normal erection of the main cable side span part 5.

[0041] In another embodiment of the present application, the step S3 is optimized. In the step S3, the method for ballasting the main cable mid-span part 4 between the two main towers 1 is as follows: Figure 2 As shown in the figure, after the main cable erection is completed, a cable crane is installed on the main cable mid-span part 4, the cable crane is moved to the midpoint of the main cable mid-span part 4, and then the mid-span beam segment 7 is hoisted, the main cable mid-span part 4 is ballasted based on the mid-span beam segment 7, and under the ballasting action of the mid-span beam segment 7, the main cable mid-span part 4 moves downward, taking the top of the main tower 1 as a fulcrum, and pulling the main cable side span parts 5 on both sides of the bridge to move to the mid-span, and the main cable side span parts 5 move upward.

[0042] The mid-span beam segment 7 itself is a structure that needs to be constructed later for the bridge, and hoisting the mid-span beam segment 7 in advance can not only ballast the main cable mid-span part 4, but also facilitate the construction of the beam body, which is equivalent to improving the construction efficiency and greatly reducing the overall construction difficulty.

[0043] In actual use, the mid-span beam segment 7 with a suitable weight can be selected according to the height that the main cable side span part 5 needs to be lifted and the specification size of the main cable, or a smaller segment of the mid-span beam segment 7 is selected, and then corresponding weights are added to the mid-span beam segment 7 according to the required weight, so that the hoisting weight of the main cable mid-span part 4 reaches the set requirement.

[0044] In a further embodiment of the present application, the step S3 is optimized. Specifically, in the step S3, the method for forcing the main cable side span part 5 between the main tower 1 and the auxiliary tower 2 to be lifted upward to a set height is as follows: forcing the main cable side span part 5 between the main tower 1 and the auxiliary tower 2 to be lifted upward to the design elevation.

[0045] The main cable side span part 5 is lifted up to the design elevation, that is, the lifted main cable side span part 5 is at the same elevation as the main cable side span part 5 in the empty cable state, and the main cable side span part 5 does not generate downward pressure at this time, and the lifted main cable side span part 5 is suspended between the first part of the secondary tower 2 below, facilitating the construction of the remaining segments of the secondary tower 2, such as Figure 3 and 4 As shown, when the construction of the secondary tower 2 is completed, the secondary cable saddle 6 on the secondary tower 2 just corresponds to the main cable side span part 5, and at this time, the main cable side span part 5 can be conveniently connected with the secondary cable saddle 6, and the overall construction is extremely simple.

[0046] In actual construction, the main tower 1, anchor 3 and first part of the secondary tower 2 are first constructed, the secondary tower 2 is constructed to a position 15m-20m away from the design top elevation of the secondary tower 2, that is, the first part of the secondary tower 2 is completed, and then the main cable is erected, the two ends of the main cable are fixedly connected with the anchors 3 on the two banks, and the main cable side span part 5 is vertically spaced from the top of the first part of the secondary tower 2, so that the secondary tower 2 does not interfere with the erection of the main cable; after the preliminary erection of the main cable is completed, the cable crane on the main cable mid-span part 4 is used to hoist and construct the mid-span beam segment 7, the weight of the mid-span beam segment 7 required for lifting the main cable side span part 5 is calculated, the mid-span beam segment 7 with the required weight is hoisted, the main cable mid-span part 4 is moved downward, the two side main cable side span parts 5 are pulled upward, and the main cable side span part 5 is lifted to the design elevation position; the current state is maintained, the secondary tower 2 is constructed, the remaining segments of the secondary tower 2 are constructed, then the secondary cable saddle 6 is installed on the top of the completed secondary tower 2, the position of the main cable side span part 5 corresponding to the secondary cable saddle 6 is connected with the secondary cable saddle 6, and the main cable construction work at the cable clamp type secondary cable saddle 6 is completed.

[0047] As shown in Figure 1 , the bridge-wise direction of the present application refers to Figure 1 the left-right direction, and the vertical direction of the present application refers to Figure 1 the up-down direction.

[0048] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A construction method of main cable based on the form of a secondary cable saddle in the form of a cable clamp made after the secondary tower, 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, 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, after the main tower is constructed, a vice tower is constructed, and the construction is stopped at a distance from the top of the tower; S2, the main cable is arranged on the main tower and the anchorage, and the cable tightening process is completed; S3, the midspan part of the main cable between the two groups of main towers is ballasted to force the edge span part of the main cable between the main tower and the vice tower to be lifted upward to a set height; S4, the vice tower construction is completed, the vice cable saddle is installed on the vice tower, and the main cable construction operation at the vice cable saddle is performed.

2. The method according to claim 1, wherein the auxiliary cable saddle is in the form of a cable clamp. In the step S1, the method for constructing the vice tower to stop at a distance from the top of the vice tower comprises: constructing the vice tower to stop at a distance of 15m to 20m from the top of the vice tower.

3. The method according to claim 1, wherein the main cable is constructed by using a sub-cable saddle in the form of a sub-cable clamp made at the back of the sub-tower. In the step S3, the method for ballasting the midspan part of the main cable between the two groups of main towers comprises: based on the midspan part of the main cable, the midspan beam section is hoisted and constructed, the vertical downward pressure is applied to the midspan part of the main cable by the midspan beam section, and the midspan part of the main cable is forced to move downward.

4. The method according to claim 1, wherein the main cable is constructed by using a sub-cable saddle in the form of a sub-cable clamp made at the back of the sub-tower. In the step S3, the method for forcing the edge span part of the main cable between the main tower and the vice tower to be lifted upward to a set height comprises: forcing the edge span part of the main cable between the main tower and the vice tower to be lifted upward to the design elevation.

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