CN-121992721-A - Bridge arch rib installation method

CN121992721ACN 121992721 ACN121992721 ACN 121992721ACN-121992721-A

Abstract

The invention provides a bridge arch rib installation method, which adopts the technical scheme that a down-channel low-position horizontal splicing and integrated rotating tower is cooperated with a horizontal rotating vertical rotating device and a beam arch synchronous construction, divides an arch rib into two arch segments to finish horizontal splicing in the down-channel low position, respectively realizes 90-degree horizontal rotation and vertical rotation of a single arch segment through the rotating tower with a first rotating device and a second rotating device, only provides a horizontal rotating force for the rotating tower during horizontal rotation, does not bear the dead weight of the arch segment, does not need to be provided with a counterweight, is arranged on the second rotating device arranged at the top of the rotating tower, is connected with the arch segment through a horizontal rotating lifting rope and a vertical rotating rope, bears the whole dead weight of the arch segment, and is cooperated with the first rotating device to rotate during horizontal rotation, is stable by virtue of a balance rope, does not need to be additionally provided with a horizontal rotating hinge balance counterweight under an arch foot during vertical rotation, avoids adverse influence on a permanent structure, and avoids construction period delay and construction period lifting caused by design change, realizes the horizontal rotating function integration through the integrated rotating tower, greatly reduces construction cost investment, reduces the down-position splicing bracket, reduces the dead weight requirements, reduces the requirements of the down-channel, reduces the interference of the arch segment and the bridge, and realizes the synchronous splicing of the bridge.

Inventors

Xia jiangnan
WU JIAN
LIU WEI
MA SHUIYING
YANG XIN

Assignees

中交路桥华南工程有限公司
中交路桥建设有限公司

Dates

Publication Date: 20260508
Application Date: 20260210

Claims (6)

1. The bridge arch rib installation method is characterized by comprising the following steps of: S1, bracket installation: Firstly, constructing a main bridge lower structure, then erecting a main girder assembling bracket (10) and a sliding bracket (20), dividing a bridge arch rib into a first arch section (50), a second arch section (60) and two arch feet (80) which are respectively arranged at two side end parts according to the design, symmetrically erecting two arch rib assembling brackets (30), wherein the arch rib assembling brackets (30) are arranged along the water direction, and symmetrically erecting two rotating towers (41), which are arranged on the axle line and coincide with the gravity center position of the bridge arch body to be horizontally rotated in the horizontal assembling state; S2, assembling the main girder (70) and the arch rib in a mounting and sectional manner: The sliding beam Duan Zhi is arranged at the design position, the in-situ assembled beam Duan Zhi is arranged at the design position, and the first arch segment (50) and the second arch segment (60) are assembled on the two arch rib assembling brackets (30) respectively; s3, closure of a main beam (70) and construction of a rotating system: The floating crane lifts the side longitudinal beam, installs the corresponding bridge deck, the girder (70) is closed; The device comprises a rotating tower (41), a first rotating device (42), a second rotating device (43), a horizontal rotating lifting rope (44), a vertical rotating rope (45) and a balance rope (46), wherein the first rotating device (42) is arranged at the lower part of the rotating tower (41) and is used for driving an arch section on the side of the first rotating device to horizontally rotate by taking a central vertical shaft of the rotating tower (41) as an axle center, the second rotating device (43) is arranged at the top of the rotating tower (41), one end of the horizontal rotating lifting rope (44) is rotationally connected with the second rotating device (43), the other end of the horizontal rotating lifting rope (44) sags, one end of the vertical rotating rope (45) is rotationally connected with the second rotating device (43), and the other end of the vertical rotating rope (45) sags, and the horizontal rotating lifting rope (44) and the vertical rotating rope (45) can be rolled or unrolled under the rotation of the second rotating device (43) in a controlled manner; s4, arc rib panning: fixedly connecting the sagging of the horizontal turning lifting rope (44) to the first arch segment (50); The arch rib assembling bracket (30) falls down, and the first arch section (50) is separated from the arch rib assembling bracket (30); Starting a second rotating device (43), winding a horizontal rotating lifting rope (44) to drive a first arch segment (50) to lift a certain height, and then starting a first rotating device (42) to drive the first arch segment (50) to horizontally rotate by taking a central vertical shaft of a rotating tower (41) as an axle center, so that the first arch segment (50) lifted by the horizontal rotating lifting rope (44) is driven to horizontally rotate by 90 degrees to a preset position in the forward bridge direction; S5, vertically rotating the arch rib: A arch leg (80) provided with an arch rib, and a vertical rotating hinge (81) is arranged at the arch leg (80); One end of the balance rope (46) is fixedly connected to the top of the rotating tower (41), and the other end of the balance rope is connected with a temporary anchorage and used for balancing the rotating tower (41); Connecting the first arch segment (50) with a vertical pivot hinge (81) at the arch springing (80); Fixedly connecting one end of a vertical rotating rope (45) which sags to the front end of a first arch section (50); then, a second rotating device (43) is started, a vertical rotating rope (45) is wound, the front end of the first arch segment (50) is driven to be lifted, and the rear end of the first arch segment is rotated along a vertical rotating hinge to be lifted by a certain included angle until the first arch segment (50) is vertically rotated to a design position; S6, rotating the second arch segment (60) by 90 degrees clockwise by referring to the flat rotation process of the first arch segment (50); s7, referring to a vertical rotation process of the first arch segment (50), vertically rotating the second arch segment (60) to a design position; s8, closing arch ribs: the first arch segment (50) and the second arch segment (60) are respectively closed at the arch tops of the two.
2. The bridge arch rib installation method according to claim 1, wherein the first arch segment (50) and the second arch segment (60) are provided with temporary tie rods (47) on the first arch segment (50) and the second arch segment (60) before being turned horizontally and vertically, and two ends of the temporary tie rods (47) are respectively connected to the front end of the first arch segment (50) and the bottom end of the first arch segment (50) and to the front end of the second arch segment (60) and the bottom end of the second arch segment (60).
3. A bridge arch rib installation method according to claim 1, wherein the horizontal turning lifting rope (44) comprises a plurality of first arch segments (50) and second arch segments (60), and before horizontal turning, one end of the sagging of the plurality of horizontal turning lifting ropes (44) is fixedly connected to the first arch segments (50) or the second arch segments (60) from front to back.
4. A bridge arch rib installation method according to claim 1, wherein the first arch segment (50) and the second arch segment (60) are removed from the first turning device (42) and the horizontal turning lifting rope (44) on the turning tower (41) before being turned vertically.
5. A bridge arch installation method according to claim 1, wherein the height of the turning tower (41) is not less than the maximum vertical lifting height of the first arch segment (50) or the second arch segment (60) during vertical turning.
6. A method of installing a bridge arch according to claim 1, wherein the temporary anchorage of the balancing cable (46) has an anchorage load capacity not less than the maximum unbalanced load during rotation of the first arch segment (50) or the second arch segment (60).

Description

Bridge arch rib installation method Technical Field The application relates to the technical field of bridge construction, in particular to a bridge arch rib installation method. Background In the technical field of bridges, arch ribs are core stress members of an arch-shaped bearing structure, the appearance of the arch ribs is arc-shaped, and the arch ribs are connected with a foundation through arch legs at two ends to jointly form a bearing framework of the arch-shaped structure. At present, the common practice of arch rib installation is to adopt a horizontal rotation and vertical rotation separated installation device and a construction method around an arch springing. The horizontal rotation installation is to use the arch rib segments after the prefabrication is completed on the ground or a temporary support to be assembled and formed, and then to drive the arch rib to rotate horizontally around a vertical shaft by using the arch foot as a rotation center and by using a horizontal rotation driving device such as a turntable and the like until the arch rib rotates to a designed installation position, and the vertical rotation installation is also to use the arch foot as a rotation center, and drive the arch rib to rotate vertically around the horizontal shaft by using a rotating tower as a support and using a traction device to lift and hang the arch rib from a horizontal or inclined state to rotate to a designed installation angle. In the installation mode of the horizontal rotation and vertical rotation separation, two sets of different devices respectively implement the horizontal rotation and the vertical rotation. Because the pull point distance between the rotating tower and the front end of the arch rib is far, a large weight balance weight is arranged at the rear end of the arch springing to realize the stress balance in the arch rib rotating process. Because the turntable is arranged at the bottom of the arch springing during the horizontal rotation, the permanent structure is influenced, the design stage of the construction drawing is considered, otherwise, the design is required to be changed in the later period, the construction period is delayed, the construction cost is further improved, and the safety of the engineering structure is even influenced. In addition, for the navigation channel with navigation requirements, the common installation methods of the large-span arch bridge steel arch rib include an in-situ splicing method, an arch rib large-section lifting method, an arch bridge integral pushing method and the like. The arch rib is installed by adopting an in-situ assembling method and a large-section lifting method, the beam and the arch are generally firstly constructed and then constructed, the arch rib lifting height is high, the requirement on lifting equipment is extremely high, the whole arch bridge pushing method needs to assemble a whole bridge at an un-designed bridge position in advance and then push, the investment of bracket materials is large, and the requirement on lifting equipment is high. In conclusion, the existing arch rib flat and vertical rotation separated installation equipment has the defects of adverse effect on a permanent structure, high design and construction cost, easiness in delaying construction period and the like, and the problems of busy channel, incapability of synchronously constructing a beam arch, long construction period, high requirement on hoisting equipment, large cost investment and the like exist in bridge arch rib installation of a water area sea area. Therefore, developing a set of arch rib installation equipment which can take the functions of horizontal rotation and vertical rotation into consideration, does not need to arrange a turntable at the bottom of an arch springing, can eliminate the influence on a permanent structure, save the construction period, reduce the investment and reduce the influence on a channel becomes a technical problem to be solved in the current field. In the above background, the applicant has proposed a new technical solution. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a bridge arch rib installation method, which adopts the following technical scheme: The bridge arch rib installing method includes the following steps: S1, bracket installation: Firstly, constructing a main bridge lower structure, and then erecting a main girder assembly bracket and a sliding bracket, dividing a bridge arch rib into a first arch section, a second arch section, two girder arches and two arch feet which are respectively arranged at the two side end parts according to the design; S2, installing and sectionally assembling main beams and arch ribs: The sliding beam Duan Zhi is arranged at the design position, the original position assembled beam Duan Zhi is arranged at the design position, and the first arch sec