Method for installing super-high ring-shaped steel tower of cable-stayed bridge

Abstract

The present application belongs to the field of bridge tower construction, and particularly relates to a method for installing an ultra-high annular steel tower of a cable-stayed bridge, comprising the following steps: 1. division and horizontal placement of annular steel tower segments: the annular steel tower is divided into steel tower segments 1-N symmetrically arranged on both sides of a middle bridge pier and a closure segment 2N+1, the first steel tower segment is fixed to the middle bridge pier, and the remaining segments are horizontally placed on the jig frame of the main girder on both sides of the middle bridge pier; 2. installation of the steel tower segments 2-N on the right side of the middle bridge pier: inner struts are installed inside the steel tower segments, the steel tower segments are sequentially pulled from top to bottom to rotate vertically and installed with the next segment, until the segments 2-N are rotated as a whole to be connected with the first steel tower segment; 3. repeating step 2 to complete the installation of the steel tower segments 2-N on the left side of the middle bridge pier; and 4. completing the installation of the steel tower closure segment N+1. The present application realizes high-precision installation of the annular steel tower by continuously vertically rotating the divided and horizontally installed annular steel tower until closure, without the need for a large number of temporary supports and large high-altitude hoisting equipment, and has good economic benefits.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge tower construction, and particularly relates to a method for installing an ultra-high annular steel tower of a cable-stayed bridge. BACKGROUND

[0002] The structural form of a cable-stayed bridge is various, resulting in different construction methods. For an ultra-high annular steel tower of a cable-stayed bridge, a traditional construction method is a support construction method, which needs to use a large amount of steel pipes or steel profiles to support the steel tower segments, and has high measure cost, needs large hoisting equipment, has large high-altitude operation amount, and has low installation efficiency.

[0003] Chinese Patent CN113481856A discloses a method for lifting construction of an annular bridge tower, and the specific steps are as follows: step one, erecting a temporary support pier on the ground of a lower ring segment; step two, assembling a plurality of segments in the middle of the lower ring segment; step three, connecting a temporary support on the lower ring segment; step four, hoisting a pre-assembled part of an upper ring segment; step five, sequentially lifting, continuing to assemble the upper ring segment, and cantilever erecting the lower ring segment; and step six, connecting the annular bridge tower, setting an attached hydraulic jack at the end of the assembled lower ring segment, and completing the hoisting of the connecting segment of the annular bridge tower by a crane. In the method, the upper ring segment is assembled on the riverbed ground and then lifted and continued to be assembled to the design position, and the assembly of the lower ring segment can be synchronized with the assembly of the upper half ring, which has advantages of safety, economy and the like. However, the method also needs to arrange an ultra-high temporary support pier, has high measure cost, has large high-altitude operation amount, and has high risk in the lifting process.

[0004] Chinese Patent CN114960465A discloses a method for turning construction of a chain lifting type cable-stayed bridge steel tower, processes the steel tower into a plurality of segments, sets a steel tower lifting frame and a sliding track, slides the steel tower segments to below the lifting frame through the sliding track, lifts the steel tower segments one by one and realizes the turning of the steel tower segments. The upper and lower adjacent steel tower segments are hinged in the lifting and turning process, and are welded and connected after the lifting and turning are completed. In the method, the lifted steel tower segments are always in a suspended state, on the one hand, as the number of lifted segments increases, the weight of the lifted segments continuously increases, which is risky, and the method is not suitable for an ultra-high annular steel tower with large diameter and large weight. On the other hand, the method needs to set a temporary lifting frame, which has large steel consumption and poor economy.

[0005] In view of the above problems in the prior art, the technical scheme of the present application is proposed. SUMMARY

[0006] In order to overcome the above problems in the prior art, the present application provides a method for installing an ultra-high annular steel tower of a cable-stayed bridge, which realizes high-precision installation of the annular steel tower by dividing the annular steel tower into segments, horizontally installing the segments, and then continuously vertically rotating the segments until the segments are closed, and has good economic benefits without a large number of temporary supports and large high-altitude hoisting equipment.

[0007] In order to achieve the above object, the present application adopts the following technical solutions:

[0008] A method for installing a super-high annular steel tower of a cable-stayed bridge, characterized in that it comprises the following steps:

[0009] Step one: division and horizontal placement of annular steel tower segments

[0010] The annular steel tower is divided into 2N+1 segments, including steel tower segments 1-N symmetrically arranged in turn on both sides of the middle pier and a steel tower closure segment N+1; N is an integer from 2 to 6.

[0011] The adjacent steel tower segments 1-N are rotationally connected so that each steel tower segment can rotate in a vertical plane; the steel tower segment 1 on the left side of the middle pier is fixedly connected to the middle pier, and the steel tower segments 2-N are horizontally placed on the cradles arranged on the main girder on both sides of the middle pier.

[0012] Step two: installation of the steel tower segments 2-N on the right side of the middle pier

[0013] The steel tower segments N, N-1,..., 2 are sequentially pulled from top to bottom and vertically rotated so that the upper steel tower segment is sequentially connected and installed with the adjacent steel tower segment below it; during installation, the connected steel tower segments are vertically rotated as a whole to connect with the next steel tower segment until the connection with the steel tower segment 1 is completed, i.e., the installation of one side of the annular steel tower is completed.

[0014] Step three: installation of the steel tower segments 2-N on the left side of the middle pier

[0015] The step two is repeated to install the steel tower segments 2-N on the left side of the middle pier until the installation of the steel tower segment 1 on the left side of the middle pier is completed.

[0016] Step four: hoisting and installation of the steel tower closure segment N+1

[0017] The steel tower closure segment N+1 is hoisted so that it is connected and fixed with the steel tower segments N on both sides, and the annular steel tower is closed.

[0018] Preferably, in the step two, an inner strut is installed in each steel tower segment, and the apexes of the inner struts between the adjacent steel tower segments are connected by another inner strut.

[0019] Preferably, the step two installation process is: (1) connection of steel tower segments N-1 and N: installing an inner support rod inside the right steel tower segment N, pulling the steel tower segment N vertically to abut and weld the joint with the steel tower segment N-1 through the inner support rod; (2) connection of steel tower segments N-1 and N: installing an inner support rod inside the steel tower segment N-1, connecting the top points of the two groups of inner support rods of the steel tower segments N and N-1 through an inner support rod, reinforcing the steel tower, and vertically rotating the steel tower segments N-1 and N as a whole to abut and weld the joint with N-2; (3) repeating steps (1) and (2) until the welded steel tower segments 2-N are vertically rotated as a whole to complete the installation of the steel tower segment 1.

[0020] The step four installation process is: connecting the top points of the two groups of inner support rods of the left and right steel tower segments N through another inner support rod, reinforcing the inside of the steel tower, hoisting the steel tower closure segment N+1, abutting the joint, and welding to complete the installation.

[0021] Preferably, in step one, when the ring-shaped steel tower is divided into segments, the size, shape, weight, and other conditions of the segments should be fully considered to ensure that the steel tower segments of the ring-shaped steel tower have the conditions for vertical rotation and installation accuracy.

[0022] Preferably, two inner support rods are installed inside each steel tower segment, and the two inner support rods form a triangle with the steel tower segment.

[0023] Preferably, the inner support rods are hinged between them and between the inner support rods and the steel tower segments, and are fixed by a pin shaft for easy installation and removal.

[0024] Preferably, the adjacent steel tower segments 1-N are connected by a hinged device, the hinged device should be arranged at not less than two on the transverse symmetry of each steel tower segment end, and be precast and welded simultaneously with each steel tower segment of the ring-shaped steel tower in the precast yard; the hinged device is removed after the adjacent steel tower segments are welded.

[0025] Preferably, in steps two and three, the vertical rotation and abutment of each steel tower segment are achieved by connecting the steel wire rope of the traction system with the inner support rod inside the steel tower segment.

[0026] Preferably, the traction system can be used on both sides, and is used for installation of steel tower segments on both sides of the ring-shaped steel tower.

[0027] Preferably, it further includes step five: after the ring-shaped steel tower is closed, various auxiliary measures are removed, the stay cables are installed, and the construction is completed.

[0028] The beneficial effects of the present application are: by dividing the annular steel tower into sections, first completing the horizontal installation of each steel tower section, then continuously vertically rotating each steel tower section on both sides of the intermediate pier according to the order from the N section to the 2 section until the steel tower section 1, and finally closing the steel tower section 2N+1, the high-precision and fast installation of the annular steel tower is realized. The inner support rod is used in the installation process, which on the one hand realizes the rotation traction of each steel tower section, and on the other hand plays a reinforcing role in the interior of the spliced steel tower section to prevent deformation and sagging of the annular steel tower caused by the inability to bear its own weight before closing. In addition, since the connection between each steel tower section in the present application is horizontal installation, the high-altitude operation during installation is less, a large number of temporary supports and large high-altitude lifting equipment are not needed, the economic benefits are good, and the safety is high, which can be popularized and applied to the construction of various tower ring structures. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a front view of the annular steel tower cable-stayed bridge;

[0030] Figure 2 is a split view of the annular steel tower section;

[0031] Figure 3 is a schematic view of the annular steel tower construction;

[0032] Figures 4 to 12 is a step diagram of the installation of the prefabricated bridge substructure.

[0033] In the figure: 1-annular steel tower, 1a-1d-steel tower section, 1e-steel tower closure section; 2-cable, 3-main beam, 4-pier, 5-cradle, 6-hinge device, 7-inner support rod, 8-steel wire rope, 9-towing system. DETAILED DESCRIPTION

[0034] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two components. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The annular steel tower cable-stayed bridge of the present application has a structure as shown in Figure 1 The installation method is as follows:

[0036] Step one, division and horizontal placement of annular steel tower section 1

[0037] The ring-shaped steel tower 1 is divided into 2N+1 segments, including 1~N segments of steel tower segments arranged symmetrically on the left and right sides of the middle pier, and N+1 steel tower closure segment at the top of the ring-shaped steel tower 1; N is preferably an integer of 2~6;

[0038] On the basis of the completion of the pier and the main beam construction, the first~N segments of steel tower segments are sequentially installed on the left and right sides of the middle pier by using hoisting equipment, and the steel tower segments on the left and right sides are fixedly connected with the middle pier, the second~N steel tower segments are arranged on the cradles on the main beam, and the adjacent two steel tower segments are hinged through the hinge devices, and each steel tower segment can be vertically rotated, i.e., rotated in the vertical plane perpendicular to the horizontal plane.

[0039] Step two, installation of the second~N steel tower segments on the right side of the middle pier

[0040] (1) Vertical rotation of the Nth steel tower segment

[0041] Two inner support rods are installed inside the Nth steel tower segment, and the two inner support rods form a triangle with the Nth steel tower segment, and a traction system is installed on the upper part of the already installed first steel tower segment, the steel wire rope of the traction system is connected with the inner support rods inside the Nth steel tower segment, and the Nth steel tower segment is vertically rotated under the action of the traction force;

[0042] (2) Connection of the N-1th and Nth steel tower segments

[0043] After the Nth steel tower segment is vertically rotated to be abutted with the N-1th steel tower segment, the abutted joint is welded, and the hinge device is removed, the inner support rods inside the N-1th steel tower segment are installed, the two inner support rods form a triangle with the N-1th steel tower segment, and the top points of the two groups of inner support rods of the Nth and N-1th steel tower segments are also connected through the inner support rods to reinforce the steel tower segment;

[0044] (3) Vertical rotation of the N-1th and Nth steel tower segments as a whole

[0045] The traction system 9 is started for the second time, and the N-1th and Nth steel tower segments are vertically rotated as a whole under the action of the traction force, so that the N-1th steel tower segment is vertically rotated to be abutted with the N-2th steel tower segment;

[0046] (4) The already welded steel tower segments are vertically rotated as a whole, and the abutted joint is welded until the abutted joint with the first steel tower segment is completed, and the hinge device is removed.

[0047] Step three, installation of the second~N steel tower segments on the left side of the middle pier

[0048] The second~N steel tower segments on the left side of the middle pier are installed repeatedly until the installation of the first steel tower segment on the left side of the middle pier is completed.

[0049] Step four, installation of the N+1th steel tower closure segment

[0050] The top points of the two groups of inner support rods on the left and right steel tower segments N are connected by the inner support rods to reinforce the inner side of the steel tower, hoist the steel tower closure segment N+1, weld the joint, and close the ring-shaped steel tower 1.

[0051] Step five, remove various auxiliary measures, install the stay cable 2, and complete the construction.

[0052] Further, when the ring-shaped steel tower 1 is divided into segments, the size, shape, weight, and other conditions of the segments should be fully considered to ensure that the steel tower segments of the ring-shaped steel tower 1 have the conditions for vertical rotation and installation accuracy.

[0053] Further, the adjacent steel tower segments 1-N are connected by the hinge device, the hinge device should be arranged at not less than two on the end of each steel tower segment in transverse symmetry, and the hinge device is precast and welded simultaneously with each steel tower segment of the ring-shaped steel tower 1 in the precast yard.

[0054] Further, the hinge device is removed after the adjacent steel tower segments are welded.

[0055] Further, the inner support rods are hinged between each other and between the inner support rods and the steel tower segments, and are fixed by a pin shaft. In order to reinforce the segments of the ring-shaped steel tower 1, prevent large deformation or instability during the installation of the ring-shaped steel tower 1.

[0056] Further, the traction system can be used on both sides, respectively for the installation of the steel tower segments on both sides of the ring-shaped steel tower 1.

[0057] Further, the hinge device used in the present application can be a steel plate with a pin hole and a pin shaft, and the steel plate is welded to the end of the ring-shaped steel tower 1. The traction system is a through-type jack or a winch. Since the hinge device and the traction system are well-known technologies in the art, they will not be described in detail here.

[0058] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and examples.

[0059] Example

[0060] The specific steps of the installation method of the super-high ring-shaped steel tower of the cable-stayed bridge in this example are as follows:

[0061] Step one, horizontal placement of the ring-shaped steel tower 1 segment

[0062] In this example, N=4, that is, the ring-shaped steel tower 1 is divided into 9 segments, including the segment steel tower segments 1a-1d symmetrically arranged along the left and right sides of the middle pier, and the steel tower closure segment 1e located at the top of the ring-shaped steel tower 1. The division of the ring-shaped steel tower 1 segments is shown in Figure 2 .

[0063] After the construction of pier 4 and main beam 3 is completed, steel tower segments 1a to 1d are installed sequentially using hoisting equipment. Specifically, steel tower segment 1a is directly connected and fixed to the intermediate pier, while steel tower segments 1b to 1d are placed on the support frames 5 arranged on the main beam 3. Adjacent steel tower segments 1a to 1d are connected by hinge devices 6, allowing 1b to 1d to rotate vertically. Figure 4 As shown. At least three hinge devices 6 are arranged at the ends of each annular steel tower segment, and are prefabricated and welded simultaneously with each steel tower segment in the prefabrication yard.

[0064] The installation process of steel tower segments 1a to 1d on one side will be described in detail below. A general installation diagram can be found in the attached diagram. Figure 3 See steps two through six, and the appendix for details. Figure 5 ~Attached Figure 9 .

[0065] Step 2: Vertical rotation of the steel tower segment by 1 day.

[0066] like Figure 5 As shown, two inner struts 7 are installed inside the steel tower segment 1d, forming a triangle with the two inner struts 7. The connection nodes of the inner struts 7 are hinged and can be fixed with pins to reinforce each steel tower segment and prevent large deformation or instability during the installation of the annular steel tower 1. Simultaneously, a traction system 9 is installed on the upper part of the already installed steel tower segment 1a, connected to the inner struts 7 inside the steel tower segment 1d via steel wire ropes. When the traction system 9 is activated, the steel tower segment 1d begins to rotate vertically under the traction force.

[0067] Step 3: Connect steel tower segments 1c and 1d.

[0068] After steel tower segment 1d is vertically rotated to align with steel tower segment 1c, the joint is welded, and the hinge device 6 is removed. Two inner struts 7 are installed on the inner side of steel tower segment 1c. The apexes of the two sets of inner struts 7 are connected by another inner strut 7 to reinforce the steel tower segment. Figure 6 As shown.

[0069] Step 4: Vertically rotate steel tower segments 1c and 1d.

[0070] The second activation of traction system 9 causes steel tower segments 1c and 1d to rotate vertically as a whole under the traction force. Figure 7 As shown.

[0071] Step 5: Connect steel tower segments 1b and 1c.

[0072] Steel tower segment 1c is vertically rotated to butt joint with steel tower segment 1b, and the butt joint is welded, and the hinge device 6 is removed. Two inner bracing bars 7 inside the steel tower segment 1b are installed, and the top points of the two groups of inner bracing bars are connected by another inner bracing bar 7, and the steel tower segment is reinforced, as shown in Figure 8 .

[0073] Step six, steel tower segments 1b, 1c and 1d are vertically rotated

[0074] The traction system 9 is started for the third time, and under the action of traction force, the steel tower segments 1b, 1c and 1d start to rotate vertically as a whole until they butt joint with the steel tower segment 1a, and the butt joint is welded, and the hinge device 6 is removed, as shown in Figure 9 .

[0075] The above completes the installation of the steel tower segments 1a-1d on one side of the ring-shaped steel tower 1, and then the steel tower segments 1a-1d on the other side are installed.

[0076] Step seven, repeat the above steps to install the steel tower segments 1b, 1c and 1d on the other side of the middle pier, and after butt joint with the steel tower segment 1a, the inner bracing bars 7 are continued to be installed at the top points of the two steel tower segments 1d on the left and right sides to reinforce the inside of the steel tower. As shown in Figure 10 , wherein the traction system 9 can be used on both sides, respectively for the installation of the steel tower segments on the left and right sides of the middle pier.

[0077] Step eight, hoist the steel tower closure segment 1e, weld the butt joint, and close the ring-shaped steel tower 1, as shown in Figure 11 .

[0078] Step nine, remove various auxiliary measures, install the stay cables 2, complete the construction, and the elevation view of the completed ring-shaped steel tower cable-stayed bridge is shown in Figure 12 .

[0079] The above describes the examples of the present application in detail, but the content is only the preferred embodiments of the present application, and cannot be considered as limiting the scope of the implementation of the present application. Any equivalent changes and improvements made according to the scope of the present application should still be within the scope of the present application.

Claims

1. A method for installing a super-high ring-shaped steel tower of a cable-stayed bridge, characterized in that It comprises the following steps: Step one, division and horizontal placement of the ring-shaped steel tower segment The ring-shaped steel tower is divided into 2N+1 segments, including the steel tower segments 1-N and the steel tower closure segment N+1 symmetrically arranged on both sides of the middle bridge pier; The adjacent steel tower segments 1-N are rotationally connected, so that each steel tower segment can rotate in a vertical plane; the steel tower segment 1 on the left side of the middle bridge pier is fixedly connected with the middle bridge pier, and the steel tower segments 2-N are horizontally placed on the cradles arranged on the main girder on both sides of the middle bridge pier; Step two, installation of the steel tower segments 2-N on the right side of the middle bridge pier The steel tower segments N, N-1,..., 2 are sequentially pulled to vertically rotate, so that the upper steel tower segments are sequentially connected with the adjacent lower steel tower segments; during the installation, the connected steel tower segments are vertically rotated as a whole to be connected with the next steel tower segment, until the connection with the steel tower segment 1 is completed, i.e. the installation of one side of the ring-shaped steel tower is completed; Step three, installation of the steel tower segments 2-N on the left side of the middle bridge pier The step two is repeated to install the steel tower segments 2-N on the left side of the middle bridge pier, until the installation of the steel tower segment 1 on the left side of the middle bridge pier is completed; Step four, hoisting and installation of the steel tower closure segment N+1 The steel tower closure segment N+1 is hoisted to be connected with the steel tower segments N on both sides and fixed, and the ring-shaped steel tower is closed; In the step two, an inner support rod is arranged in each steel tower segment, and the top points of the inner support rods between the adjacent steel tower segments are connected by another inner support rod; The installation process of the step two is as follows: (1) connection of the steel tower segments N-1 and N: an inner support rod is arranged in the right steel tower segment N, and the steel tower segment N is pulled to vertically rotate to be connected with the steel tower segment N-1 by the inner support rod and welded; (2) connection of the steel tower segments N-1 and N: an inner support rod is arranged in the steel tower segment N-1, the top points of the two groups of inner support rods of the steel tower segments N and N-1 are also connected by an inner support rod, and the steel tower segments are reinforced; the steel tower segments N-1 and N are vertically rotated as a whole to be connected with the steel tower segment N-2 and welded; (3) steps (1) and (2) are repeated, until the steel tower segments 2-N which are welded are vertically rotated as a whole to be connected with the steel tower segment 1; The installation process of the step four is as follows: the top points of the two groups of inner support rods of the steel tower segments N on both sides are also connected by another inner support rod, the inner side of the steel tower is reinforced, and then the steel tower closure segment N+1 is hoisted, the welding joint is welded, and the installation is completed.

2. The method of installing a cable-stayed bridge super-high ring-shaped steel tower according to claim 1, characterized in that: Two inner support rods are arranged in the inner side of each steel tower segment, and the two inner support rods and the steel tower segment form a triangle.

3. The method of claim 1, wherein: The inner support rods are hingedly connected with each other and with the steel tower segment, and are fixed by a pin shaft.

4. The method of claim 1, wherein: The adjacent steel tower segments 1-N are rotationally connected by a hinging device, the hinging device is arranged on the end of each steel tower segment in transverse symmetry and is not less than two, and is simultaneously prefabricated and welded with each steel tower segment of the ring-shaped steel tower in the prefabrication yard; the hinging device is removed after the welding joint of the adjacent steel tower segments.

5. The method of installing a cable-stayed bridge super-high ring-shaped steel tower according to claim 1, characterized in that: In the steps two and three, the vertical rotation and connection of each steel tower segment are realized by connecting the steel wire rope of the traction system with the inner support rod in the inner side of the steel tower segment.

6. The method of installing a cable-stayed bridge super-high ring-shaped steel tower according to claim 5, characterized in that: The traction system can be used on both sides, and is respectively used for the installation of the steel tower segments on both sides of the ring-shaped steel tower.

7. The method of installing a cable-stayed bridge super-high ring-shaped steel tower according to claim 1, characterized in that: Also included is step five, after the closure of the ring steel tower, remove all kinds of auxiliary measures, to install the cable, complete the construction.

8. The method of installing a cable-stayed bridge super-high ring-shaped steel tower according to claim 1, characterized in that: N is an integer from 2 to 6.

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