A vertical rotation device and construction method for the V-shaped main tower of a low tower hybrid girder cable-stayed bridge

Abstract

The present invention discloses a vertical rotation device and construction method for a V-shaped main tower of a low tower hybrid girder cable-stayed bridge, belonging to the field of bridge construction equipment, including a base. Symmetrically fixed to the upper end of the base are traction devices, and a number of protective devices are also installed on the upper end of the base. In the present invention, first align the side tower column with the lower tower column, and then turn on the hydraulic rod and the hydraulic jack. The hydraulic jack will jack up the side tower column to make it rotate upward. After the hydraulic rod is turned on, it will stretch and contract back and forth. During the stretching and contracting process of the hydraulic rod, the traction steel cable can be pulled under the mutual cooperation of the dragging block and the locking sleeve. By this way, the traction steel cable can be continuously pulled, so as to use the traction steel cable to pull the side tower column to align it with the lower tower column. By this method, the installation time of the entire support tower column of the cable-stayed bridge can be greatly saved, and at the same time, the use of large hoisting equipment to assist in the installation is avoided, thus greatly saving costs.

Description

Technical Field

[0001] The present invention relates to the field of bridge construction equipment, and particularly to a vertical rotation device for the V-shaped main tower of a low-tower hybrid girder cable-stayed bridge and a construction method therefor. Background Art

[0002] With the vigorous development of bridge professional technology, the increase in the span length of bridges, the increasing demand for landscape bridges, and the increasing demand for engineering economy, the combined bridge type system and the thin and light main girder structure size have gradually become the trend in the development process of modern bridges. As a combined system bridge, the low-tower cable-stayed bridge has the prominent characteristics of a low tower, a rigid girder, and concentrated cables. Its lower bridge tower not only meets the stiffness requirements for the overall use of the bridge, but also meets the aesthetic requirements of urban bridges. Compared with conventional cable-stayed bridges, it is a very competitive bridge type choice. And the vertical rotation construction of the main tower is a key and difficult point in the main bridge construction. At present, there are mainly two structural systems for the vertical rotation of the main tower. One is the aerial segmented hoisting method, whose installation accuracy is difficult to control and the risk coefficient is high. The other is the overall vertical rotation construction method. Although it can reduce the amount of high-altitude work, lower the working difficulty of high-altitude assembly, and effectively guarantee the assembly accuracy, the stability of the vertical rotation system during the construction process is difficult to ensure. Not only is the construction efficiency low, but the cost is also high. Therefore, the present invention provides a vertical rotation device for the V-shaped main tower of a low-tower hybrid girder cable-stayed bridge to solve the above-mentioned problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a vertical rotation device for the V-shaped main tower of a low-tower hybrid girder cable-stayed bridge to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A vertical rotation device for the V-shaped main tower of a low-tower hybrid girder cable-stayed bridge includes a base. Symmetrically fixed to the upper end of the base are traction devices, and a number of protective devices are also installed on the upper end of the base. The traction cables can be pulled by the traction devices, and the traction cables can be locked by the protective devices. The traction device includes a fixed sleeve. Fixedly connected inside the fixed sleeve is a hydraulic rod. The piston end of the hydraulic rod is fixedly connected to a dragging block. Symmetrically formed on the dragging block are installation channels. Installed in the installation channels are locking sleeves. The traction cables can be locked by the locking sleeves;

[0006] One end of the locking sleeve away from the fixed sleeve has a larger diameter than the end close to the fixed sleeve, and a number of deformation notches are formed on the outer wall of the locking sleeve. The shape of the installation channel corresponds to that of the locking sleeve. Symmetrically fixedly connected to the outer wall of the locking sleeve are side ears. Slidably connected inside the side ears are sliding rods. The sliding rods penetrate through the dragging block and are slidably connected to the dragging block. A return spring is also sleeved on the outer wall of the sliding rods.

[0007] As a further solution of the present invention, two limiting channels are symmetrically arranged on the outer wall of the fixed sleeve, and the limiting channels correspond to the installation channels, and the traction cable can be guided through the limiting channels.

[0008] As a further solution of the present invention, the protection device includes a protective sleeve, an adjusting ring is threadedly connected to the inner side of the protective sleeve, a locking channel is arranged in the protective sleeve, a limiting sleeve is slidably connected in the locking channel, and the limiting sleeve corresponds to the locking channel.

[0009] As a further solution of the present invention, a number of limiting notches are arranged on the outer wall of the limiting sleeve, and the limiting sleeve is slidably connected to the adjusting ring.

[0010] As a further solution of the present invention, a number of sliding grooves are arranged on the inner wall of the adjusting ring, a number of sliding blocks are fixedly connected to the outer wall of the limiting sleeve, the sliding blocks are located in the sliding grooves, and a support spring is installed inside the sliding grooves.

[0011] As a further solution of the present invention, two support screws are threadedly connected to one end of the adjusting ring away from the protective sleeve, and the support screws correspond to the sliding grooves.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. When the present invention is used, first align the side tower column with the lower tower column, then place a number of hydraulic jacks at the lower end of the side tower column, then rotatably connect the side tower column and the lower tower column through the rotating hinge, then fix a number of support columns on the bridge deck, fixedly connect the base with the bridge deck, and finally fix one end of the traction cable to the column wall of the side tower column, and the other end is sequentially connected through the protection device and the traction device. The support column can guide and support the traction cable. Then, the hydraulic rod and the hydraulic jack are turned on. The hydraulic jack will jack up the side tower column to make it rotate upward. After the hydraulic rod is turned on, it will stretch and contract back and forth. During the stretching and contracting process of the hydraulic rod, the traction cable can be pulled under the mutual cooperation of the dragging block and the locking sleeve. In this way, the traction cable can be continuously pulled, so as to use the traction cable to pull the side tower column to align it with the lower tower column, then weld the lower tower column and the side tower column, and finally connect the two side tower columns to complete the installation of the side tower column. In this way, the installation time of the entire support tower column of the cable-stayed bridge can be greatly saved, and at the same time, the use of large hoisting equipment to assist in the installation is avoided, thereby greatly saving costs.

[0014] 2. When the present invention is in use, during the process of pulling the traction cable, friction will be generated between the limiting sleeve and the traction cable. At this time, the limiting sleeve will be pulled by the traction cable and move towards the adjusting ring. When the hydraulic rod retracts, the traction cable will be pulled by the side tower column. At this time, the traction cable will drive the limiting sleeve to move towards the inside of the locking channel. When the limiting sleeve moves into the locking channel, it will be squeezed to lock and limit the traction cable, thereby preventing the traction cable from being pulled back by the side tower column. By this means, the safety of the present invention can be increased, and the problem of the sudden collapse of the side tower column can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a vertical rotation device for a V-shaped main tower of a low tower hybrid girder cable-stayed bridge.

[0016] Figure 2 It is an exploded view of a vertical rotation device for a V-shaped main tower of a low tower hybrid girder cable-stayed bridge.

[0017] Figure 3 It is an exploded view of a traction structure in a vertical rotation device for a V-shaped main tower of a low tower hybrid girder cable-stayed bridge.

[0018] Figure 4 It is a structural diagram of a protection device in a vertical rotation device for a V-shaped main tower of a low tower hybrid girder cable-stayed bridge.

[0019] Figure 5 It is a cross-sectional view of a protection device in a vertical rotation device for a V-shaped main tower of a low tower hybrid girder cable-stayed bridge.

[0020] Figure 6 It is a schematic diagram of the use of a vertical rotation device for a V-shaped main tower of a low tower hybrid girder cable-stayed bridge.

[0021] In the figure: 1, base; 2, traction device; 3, protection device; 4, lower tower column; 5, side tower column; 6, traction cable; 7, hydraulic jack; 8, support column; 100, installation groove; 101, fixed groove; 102, guide post; 200, fixed sleeve; 201, fixed plate; 202, hydraulic rod; 203, dragging block; 204, installation channel; 205, locking sleeve; 206, deformation notch; 207, sliding rod; 208, return spring; 209, limiting channel; 300, protective sleeve; 301, adjusting ring; 302, locking channel; 303, limiting sleeve; 304, limiting notch; 305, slider; 306, support spring; 307, support screw; 308, chute. DETAILED DESCRIPTION OF THE INVENTION

[0022] Please refer to Figures 1 to 3, in the embodiments of the present invention, a vertical rotation device for the V-shaped main tower of a low tower hybrid girder cable-stayed bridge includes a base 1. Symmetrically and fixedly connected to the upper end of the base 1 is a traction device 2. A number of protective devices 3 are also installed on the upper end of the base 1. The traction cable 6 can be pulled by the traction device 2, and the traction cable 6 can be locked by the protective device 3. An installation groove 100 is formed in the upper end of the base 1. The traction device 2 is located within the installation groove 100. A fixing plate 201 is fixedly connected to the outside of the traction device 2. A fixing groove 101 is formed in the inner wall of the installation groove 100. The fixing plate 201 is located within the fixing groove 101, and the fixing plate 201 is fixedly connected to the base 1 by bolts. The traction device 2 includes a fixed sleeve 200. The fixing plate 201 is fixedly connected to the fixed sleeve 200. A hydraulic rod 202 is fixedly connected inside the fixed sleeve 200. The piston end of the hydraulic rod 202 is fixedly connected to a dragging block 203. Installation channels 204 are symmetrically formed in the dragging block 203. A locking sleeve 205 is installed within the installation channels 204. The locking sleeve 205 is made of steel material, and anti-slip patterns are provided on the inner wall of the locking sleeve 205. The traction cable 6 can be locked by the locking sleeve 205. Two limiting channels 209 are symmetrically formed on the outer wall of the fixed sleeve 200. The limiting channels 209 correspond to the installation channels 204. The traction cable 6 can be guided through the limiting channels 209;

[0023] The diameter of the end of the locking sleeve 205 away from the fixed sleeve 200 is larger than that of the end close to the fixed sleeve 200. A number of deformation notches 206 are formed on the outer wall of the locking sleeve 205. The shape of the installation channels 204 corresponds to that of the locking sleeve 205. The diameter of the installation channels 204 gradually decreases from the end away from the fixed sleeve 200 to the end close to the fixed sleeve 200, that is, the installation channels 204 are frustum-shaped. Side ears are symmetrically and fixedly connected to the outer wall of the locking sleeve 205. A sliding rod 207 is slidably connected within the side ears. The sliding rod 207 penetrates through the dragging block 203 and is slidably connected to the dragging block 203. A return spring 208 is also sleeved on the outer wall of the sliding rod 207.

[0024] Embodiment Two:

[0025] Please refer to Figures 4 - 5, on the basis of Embodiment 1, the protection device 3 includes a protective sleeve 300. The protective sleeve 300 is fixedly connected to the base 1. An adjusting ring 301 is threadedly connected to the inner side of the protective sleeve 300. A locking channel 302 is formed in the protective sleeve 300. The locking channel 302 is a variable-diameter channel and is in a horn shape. The diameter of the end of the locking channel 302 close to the installation groove 100 is larger than that of the end far from the installation groove 100. A limiting sleeve 303 is slidably connected in the locking channel 302. The limiting sleeve 303 corresponds to the locking channel 302. The limiting sleeve 303 is in a frustum shape, and a number of limiting notches 304 are formed on the outer wall of the limiting sleeve 303. The limiting sleeve 303 is also made of steel material. The limiting sleeve 303 is slidably connected to the adjusting ring 301. A number of sliding grooves 308 are formed on the inner wall of the adjusting ring 301. A number of sliding blocks 305 are fixedly connected to the outer wall of the limiting sleeve 303. The sliding blocks 305 are located in the sliding grooves 308. A support spring 306 is installed inside the sliding groove 308. One end of the support spring 306 is fixedly connected to the sliding block 305, and the other end is fixedly connected to the adjusting ring 301. Two support screws 307 are threadedly connected to the end of the adjusting ring 301 far from the protective sleeve 300. The support screws 307 correspond to the sliding grooves 308.

[0026] The working principle of the present invention is:

[0027] Please refer to Figure 6 , when the present invention is used, first align the side tower column 5 with the lower tower column 4, then place a number of hydraulic jacks 7 at the lower end of the side tower column 5, then rotatably connect the side tower column 5 and the lower tower column 4 through a rotating hinge, then fix a number of support columns 8 on the bridge deck, fixedly connect the base 1 to the bridge deck, and finally fixedly connect one end of the towing cable 6 to the column wall of the side tower column 5, and the other end passes through the protection device 3 and the towing device 2 in sequence for connection. The support column 8 can guide and support the towing cable 6, and the guiding column 102 at the upper end of the base 1 can make the towing cable 6 naturally transition into the towing device 2;

[0028] When adjusting the opposite side tower column 5, the hydraulic rod 202 and the hydraulic ejector rod 7 are activated. After the hydraulic ejector rod 7 is activated, it will push up the side tower column 5 to make it rotate upward. After the hydraulic rod 202 is activated, it first pushes the drag block 203 to move away from the fixed sleeve 200. When the drag block 203 moves, it will push the locking sleeve 205 to move. At this time, the locking sleeve 205 will contract under the extrusion of the installation channel 204 so that it tightly clamps the traction cable 6. Thus, the traction cable 6 is pulled by the mutual cooperation of the locking sleeve 205 and the drag block 203. When the hydraulic rod 202 extends to the longest, the hydraulic rod 202 starts to retract. At this time, the drag block 203 will move towards the fixed sleeve 200. When the drag block 203 moves, since there is friction between the locking sleeve 205 and the traction cable 6, the locking sleeve 205 will first disengage from the installation channel 204. As the drag block 203 continues to retract, the locking sleeve 205 will be dragged by the slide rod 207 towards the drag block 203. When the hydraulic rod 202 extends again, the drag block 203 will cooperate with the locking sleeve 205 to pull the traction cable 6 again. In this way, the traction cable 6 can be continuously pulled, so that the side tower column 5 is pulled by the traction cable 6 to be aligned with the lower tower column 4. Then, the lower tower column 4 and the side tower column 5 are welded. Finally, the two side tower columns 5 are connected to complete the installation of the side tower column 5. By this method, the installation time of the entire support tower column of the cable-stayed bridge can be greatly saved, and at the same time, the use of large hoisting equipment to assist in the installation is avoided, thus greatly saving costs;

[0029] When the traction cable 6 is being pulled, friction will be generated between the limiting sleeve 303 and the traction cable 6. At this time, the limiting sleeve 303 will be pulled by the traction cable 6 towards the adjusting ring 301. When the hydraulic rod 202 retracts, the traction cable 6 will be pulled by the side tower column 5. At this time, the traction cable 6 will drive the limiting sleeve 303 to move into the locking channel 302. When the limiting sleeve 303 moves into the locking channel 302, it will be squeezed to lock and limit the traction cable 6, thereby preventing the traction cable 6 from being pulled back by the side tower column 5. By this method, the safety of the present invention can be increased, and the problem of the sudden collapse of the side tower column 5 can be avoided;

[0030] By rotating the support screw 307 to make it abut against the slider 305, and then rotating the adjusting ring 301 to make it move towards the protective sleeve 300, the limiting sleeve 303 can be inserted into the locking channel 302 first. At this time, one end of the limiting sleeve 303 will start to contract. Then, rotate the support screw 307. In this way, the diameter of one end of the limiting sleeve 303 can be adjusted, so that the diameter of the limiting sleeve 303 is more suitable for the traction cable 6, thereby avoiding excessive friction between the limiting sleeve 303 and the traction cable 6, which causes the hydraulic rod 202 to be unable to smoothly pull the traction cable 6.

[0031] As described above, it is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A vertical rotation device for the V-shaped main tower of a low tower hybrid girder cable-stayed bridge, comprising a base (1), characterized in that, At the upper end of the base (1), traction devices (2) are symmetrically and fixedly connected. Several protective devices (3) are also installed at the upper end of the base (1). The traction cable (6) can be pulled by the traction device (2), and the traction cable (6) can be locked by the protective device (3). The traction device (2) includes a fixed sleeve (200). Inside the fixed sleeve (200), a hydraulic rod (202) is fixedly connected. The piston end of the hydraulic rod (202) is fixedly connected with a dragging block (203). Installation channels (204) are symmetrically formed in the dragging block (203). A locking sleeve (205) is installed in the installation channel (204). The traction cable (6) can be locked by the locking sleeve (205). One end of the locking sleeve (205) away from the fixed sleeve (200) has a larger diameter than the end close to the fixed sleeve (200). A number of deformation notches (206) are formed on the outer wall of the locking sleeve (205). The shape of the installation channel (204) corresponds to that of the locking sleeve (205). On the outer wall of the locking sleeve (205), side ears are symmetrically and fixedly connected. A sliding rod (207) is slidably connected in the side ears. The sliding rod (207) penetrates the dragging block (203) and is slidably connected with the dragging block (203). A return spring (208) is also sleeved on the outer wall of the sliding rod (207). The protective device (3) includes a protective sleeve (300). An adjusting ring (301) is threadedly connected to the inner side of the protective sleeve (300). A locking channel (302) is formed in the protective sleeve (300). A limiting sleeve (303) is slidably connected in the locking channel (302). The limiting sleeve (303) corresponds to the locking channel (302).

2. The vertical rotation device for the V-shaped main tower of a low tower hybrid girder cable-stayed bridge according to claim 1, characterized in that, Two limiting channels (209) are symmetrically formed on the outer wall of the fixed sleeve (200). The limiting channels (209) correspond to the installation channels (204). The traction cable (6) can be guided through the limiting channels (209).

3. A V-shaped main tower vertical rotation device for a low tower hybrid girder cable-stayed bridge according to claim 1, characterized in that A number of limiting notches (304) are formed on the outer wall of the limiting sleeve (303). The limiting sleeve (303) is slidably connected with the adjusting ring (301).

4. The vertical rotation device for the V-shaped main tower of a low tower hybrid girder cable-stayed bridge according to claim 3, characterized in that, A number of sliding grooves (308) are formed on the inner wall of the adjusting ring (301). A number of sliding blocks (305) are fixedly connected to the outer wall of the limiting sleeve (303). The sliding blocks (305) are located in the sliding grooves (308). A support spring (306) is installed inside the sliding grooves (308).

5. A V-shaped main tower vertical rotation device for a low tower hybrid girder cable-stayed bridge according to claim 4, characterized in that, Two support screws (307) are threadedly connected to one end of the adjusting ring (301) away from the protective sleeve (300). The support screws (307) correspond to the sliding grooves (308).

6. A construction method for the vertical rotation of the V-shaped main tower of a low tower hybrid girder cable-stayed bridge, which is used for the V-shaped main tower vertical rotation device of a low tower hybrid girder cable-stayed bridge according to any one of claims 1-5, characterized in that, Including the following steps: S1: First, align the side tower column (5) with the lower tower column (4). Then, place a number of hydraulic jacks (7) at the lower end of the side tower column (5). Then, rotatably connect the side tower column (5) and the lower tower column (4) through a rotating hinge. Then, fix a number of support columns (8) on the bridge deck and fixedly connect the base (1) with the bridge deck. S2: Then, one end of the towing cable (6) is fixedly connected to the column wall of the side tower column (5), and the other end is sequentially passed through the protection device (3) and the towing device (2) and connected. The support column (8) can be used to guide and support the towing cable (6); S3: Finally, the hydraulic rod (202) and the hydraulic ejector rod (7) are opened. After the hydraulic ejector rod (7) is opened, it will jack up the side tower column (5) to make it rotate upward. After the hydraulic rod (202) is opened, it will first push the dragging block (203) to move away from the fixed sleeve (200). When the dragging block (203) moves, it will push the locking sleeve (205) to move. At this time, the locking sleeve (205) will contract under the extrusion of the installation channel (204) so that it tightly clamps the towing cable (6). Thus, the towing cable (6) is pulled by the mutual cooperation of the locking sleeve (205) and the dragging block (203).

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