Steel arch bridge arch rib horizontal floating transportation overwater vertical rotation installation method

Abstract

The invention relates to a steel arch bridge arch rib horizontal type floating transportation overwater vertical rotation installation method which comprises the steps that firstly, arch rib vertical rotation buckling towers are erected on the two banks respectively, arch foot pre-buried sections are constructed, meanwhile, two vertical rotation sections of an arch rib are assembled on a backfield, the arch rib vertical rotation sections are transported to a bridge site through ships in a floating mode respectively, the arch foot ends of the two arch rib vertical rotation sections are hinged to the arch foot pre-buried sections on the two banks respectively, and then the arch rib vertical rotation buckling towers and the arch foot pre-buried sections on the two banks are installed. Inhaul cables are connected between the buckling towers on the two banks and the two arch rib vertical rotating sections respectively, and the two arch rib sections are vertically rotated to the designed installation height through a conventional vertical rotating method; and finally, the arch rib closure section is transported to the position below the bridge in a floating mode, the closure section is lifted and installed through the lifting scaffolds on the two arch rib vertical rotation sections, and arch rib vertical rotation installation construction is completed. According to the method, the problems that in-situ horizontal splicing and vertical rotation cannot be conducted on the wading arch bridge arch rib, and the overall floating transportation risk of a conventional arch rib is high are solved, the application range of arch rib vertical rotation construction is expanded, and compared with a conventional vertical rotation method, the construction efficiency can be further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and relates to an arch rib installation construction of a steel structure arch bridge, and specifically to a method for horizontally floating and vertically rotating the arch rib of a steel arch bridge on water. Background Art

[0002] The vertical rotation installation construction of the arch rib of a steel arch bridge usually involves setting up pylons and hinges on both sides, setting up low supports at the bridge location, dividing the arch rib into two large sections, assembling the two sections of the arch rib on the low supports, connecting the arch foot end of each section to the hinge, connecting cables between the pylons and the two arch rib sections, vertically rotating the two arch rib sections to the installation height, installing scaffolding at the front ends of the two arch rib sections, and lifting and installing the arch rib joint section through the scaffolding to complete the arch rib installation construction.

[0003] Arch rib vertical rotation construction has many advantages, such as high construction cost and efficiency, arch ribs can be assembled at low positions to reduce construction risks, and can reduce the consumption of support materials. However, when constructing wading bridges across rivers, lakes, etc., it is impossible to set up supports in the water, so the use of vertical rotation construction is limited. Usually in wading environments, arch ribs can be installed and constructed using cable hanging + inclined buckle hanging method, but the cost is high and the efficiency is low; when the water depth meets the navigation conditions, the construction method of assembling arch ribs in different positions and floating them to the bridge position for lifting or jacking installation can also be adopted. However, during the overall transportation process, due to the high height of the arch ribs, they are greatly affected by wind and waves and have a high risk, especially for large-span arch ribs, which require the use of two ships for coordinated floating, which is even more risky. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a method for the horizontal floating water vertical rotation installation of the arch ribs of a steel arch bridge, so as to apply the arch rib vertical rotation method to the water environment to give full play to the technical advantages of the vertical rotation construction.

[0005] The technical solution of the present invention is as follows:

[0006] A method for installing a horizontal floating steel arch bridge rib vertically on water, characterized by comprising the following steps:

[0007] (1) Set up arch rib vertical rotation buckle towers on both sides and construct the pre-buried section of the arch foot; at the same time, assemble the two vertical rotation segments of the arch rib in the back field, and install lifting scaffolds at the front ends of the two arch rib vertical rotation segments;

[0008] (2) After the two arch rib vertical rotation segments are assembled, they are floated to the bridge site by boat. When floating, the arch rib vertical rotation segments are in a lying position on the boat and supported by low brackets;

[0009] (3) The arch foot ends of the two arch rib vertical rotation segments are hinged to the pre-embedded arch foot segments on both sides; cables are connected between the buckle towers on both sides and the two arch rib vertical rotation segments, and the two arch rib segments are vertically rotated to the designed installation height using the conventional vertical rotation method;

[0010] (4) The arch rib joint section is floated to the bottom of the bridge, and the joint section is lifted into place by the lifting scaffolding on the two arch rib vertical rotation sections and connected with the two arch rib vertical rotation sections to complete the arch rib vertical rotation installation construction.

[0011] The present invention combines the vertical rotation of the arch rib with the floating installation, and the vertical rotation construction of the arch rib can be carried out on water, which solves the problems that the arch ribs of the water-borne arch bridge cannot be assembled and vertically rotated in situ, and the risk of floating the arch rib as a whole is high, and expands the application scope of the arch rib vertical rotation construction. Moreover, compared with the conventional vertical rotation method, the back-field assembly of the arch ribs and the on-site tower and arch seat can be constructed simultaneously in the present invention, which can further improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the state where the vertical rotation segment of the arch rib is horizontally floated to the bridge position;

[0013] Figure 2 It is a schematic diagram of the state where the two arch rib vertical rotation sections are connected to the two banks on the ship;

[0014] Figure 3 This is a schematic diagram of the state where the vertical rotation section of the arch rib is connected to the tower on the ship;

[0015] Figure 4 It is a schematic diagram of the state when the arch rib is vertically rotated into place;

[0016] Figure 5 It is a schematic diagram of the state of the lifting arch rib closure section;

[0017] Figure 6 This is a schematic diagram of the state when the arch rib is completed. DETAILED DESCRIPTION

[0018] The specific construction method of the present invention is as follows:

[0019] (1) Figure 1 As shown, arch rib vertical rotation buckle towers 1 are respectively set up on both sides, and the arch foot embedded section 2 is constructed; at the same time, two arch rib vertical rotation segments 3 are assembled in the back field, and lifting scaffolds 4 are respectively installed at the front ends of the two arch rib vertical rotation segments 3;

[0020] (2) After the two arch rib vertical rotation segments 3 are assembled, they are floated to the bridge position by ships 5. When floating, the arch rib vertical rotation segments 3 are in a lying position on the ship and supported by low brackets 6;

[0021] (3) Figure 2 , Figure 3 , Figure 4As shown, anchor the ship 5 stably; hinge the arch foot ends of the two arch rib vertical rotation segments 3 to the arch foot embedded segments 2 on both sides respectively; connect the cable 7 between the buckle towers 1 on both sides and the two arch rib vertical rotation segments 3 respectively, and use the conventional vertical rotation method to vertically rotate the two arch rib segments to the designed installation height; weld and fix the arch rib vertical rotation segment to the arch foot embedded segment;

[0022] (4) Figure 5 , Figure 6 As shown, the arch rib joint section 8 is floated under the bridge, and the joint section 8 is lifted into place by the lifting scaffolding 4 on the two arch rib vertical rotation sections and connected with the two arch rib vertical rotation sections to complete the arch rib vertical rotation installation construction.

Claims

1. A method for installing the horizontal floating rib of a steel arch bridge vertically on water, characterized in that The following steps are involved: (1) Set up arch rib vertical rotation buckle towers on both sides and construct the pre-buried section of the arch foot; at the same time, assemble the two vertical rotation segments of the arch rib in the back field, and install lifting scaffolds at the front ends of the two arch rib vertical rotation segments; (2) After the two arch rib vertical rotation segments are assembled, they are floated to the bridge site by boat. When floating, the arch rib vertical rotation segments are in a lying position on the boat and supported by low brackets; (3) The arch foot ends of the two arch rib vertical rotation segments are hinged to the pre-embedded arch foot segments on both sides; cables are connected between the buckle towers on both sides and the two arch rib vertical rotation segments, and the two arch rib segments are vertically rotated to the designed installation height using the conventional vertical rotation method; (4) The arch rib joint section is floated to the bottom of the bridge, and the joint section is lifted into place by the lifting scaffolding on the two arch rib vertical rotation sections and connected with the two arch rib vertical rotation sections to complete the arch rib vertical rotation installation construction.

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