Bridge steel pipe arch rib section vertical transportation and anchoring positioning method

Abstract

The invention provides a bridge steel pipe arch rib segment vertical transportation and anchoring positioning method, and belongs to the technical field of steel pipe arch rib segment transportation, and the method comprises the following steps: carrying out calculation and analysis on arch rib loading and transportation, carrying out cabin ballast, arranging a special transportation device, fixing a binding system, selecting an anchoring positioning mode, and carrying out shore anchoring positioning. And the positioning ship assists anchoring positioning. The problem that the arch ribs need to be turned over before being hoisted is solved through vertical transportation of the arch ribs, meanwhile, safety and stability of transportation are guaranteed through various loading and fastening measures such as cabin ballast, special transportation device arrangement and steel wire rope binding and fastening, ship anchoring positioning adopts a shoreside anchoring positioning mode and a positioning ship auxiliary anchoring positioning mode, and the safety and stability of transportation are guaranteed. Safe, stable and high-precision positioning is achieved, and the ship positioning efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel pipe arch rib segment transportation, in particular to a bridge steel pipe arch rib segment vertical transportation and anchoring positioning method. BACKGROUND

[0002] The height-width ratio of the arch rib of a large-span steel pipe concrete truss bridge is generally large, and the arch rib of such a bridge is preferably transported horizontally and hoisted vertically. When vertical transportation is used, the center of gravity of the arch rib is high, making it difficult to fix the arch rib and reducing the safety factor. The Wujiang Super Bridge is located at the junction of Fenggang County in Zunyi City, Sinan County in Tongren City and Shiqing County, and there is no spare space on both sides of the cable crane within the scope of the bridge for turning operation, which is extremely difficult and risky.

[0003] The main bridge of the Wujiang Super Bridge is a deck-type steel pipe concrete arch bridge with a length of 504m (calculated span of 475m) and a rigid joint collaborative stress system of arch, beam and column. The arch rib is a deck-type steel pipe concrete variable cross-section truss arch with a calculated span of 475m, a catenary arch axis and an arch axis coefficient of 2.2. The sagitta-span ratio is 1 / 5.278, and the sagitta is 90m. The radial height of the main chord pipe at the arch crown section is 7m, and the radial height of the main chord pipe at the arch foot section is 10m. The radial height of the arch section varies according to a quadratic parabola. The single arch rib is composed of two upper and lower φ1 400 steel pipe chord pipes, with a horizontal center distance of 2.5m and a horizontal center distance between the two arch ribs of 16m.

[0004] The main arch rib segments are divided according to the component transportation length and lifting weight control. From the arch foot to the arch crown, there are 15 segments from GL1 to GL151, a total of 60 segments in the whole bridge. The maximum segment size is 21.1m x 2.5m x 11.2m, and the maximum segment lifting weight is 157.8t. The Wujiang section is currently a fourth-class waterway, allowing only 500t ships with a width of 10.8m to pass, and no large ships can be used. According to the actual situation, a 500t ship in the existing Wujiang River basin is selected for positioning and transportation. In order to solve the problem of transportation of the main arch rib segments of the Wujiang Super Bridge, a bridge steel pipe arch rib segment vertical transportation and anchoring positioning method needs to be designed. SUMMARY

[0005] The purpose of the present application is to provide a bridge steel pipe arch rib segment vertical transportation and anchoring positioning method to solve the technical problems mentioned in the background.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] The bridge steel pipe arch rib segment vertical transportation and anchoring positioning method comprises the following steps:

[0008] Step 1: Calculate and analyze the transportation of the arch rib;

[0009] Step 2: Perform ship cabin ballast;

[0010] Step 3: Set up a special transportation device;

[0011] Step 4: Fix the binding system;

[0012] Step 5: Select anchoring positioning method;

[0013] Step 6: Shore anchoring positioning;

[0014] Step 7: Positioning ship auxiliary anchoring positioning.

[0015] Further, the specific process of Step 1 is as follows:

[0016] Step 1.1: Ship stability analysis According to the "Technical Rules for Statutory Inspection of Inland Ships", complete stability calculation is performed, based on the selected ship model and input calculation parameters, and the complete stability criterion results are all qualified;

[0017] Step 1.2: Calculation and analysis of the strength of the fixing According to the requirements of the "Safety Evaluation Guide for Major Transport Ships", the strength of the fixing facility is calculated, and the nominal diameter and tensile strength of the selected fixing steel wire rope are obtained;

[0018] Step 1.3: Calculation and analysis of the support tool The support tool is a load-bearing component of the arch rib, and is a key position for transportation safety. The tool material is steel, and the calculation and analysis of the tool is modeled and calculated using Midas Civil. The tool weight, segment load and dynamic load coefficient are considered during calculation. After calculation, the maximum combined stress of the tool is 42.7 MPa, and the maximum deformation is <1 mm.

[0019] Further, the specific process of Step 2 is as follows: Since the center of gravity of the main arch rib segment is higher than the set value, the overall stability of the ship decreases after loading, so it is necessary to use concrete counterweight blocks for ballast in the ship cabin to ensure safe navigation and transportation. When ballasting, evenly ballast the concrete around the cabin.

[0020] Further, the specific process of step 3 is that, since the arch rib is composed of a circular tubular structure, a special transportation device is arranged to fix the position in the cabin to ensure the safety of transportation. The special transportation device includes a base steel plate, a limiting device and a support tool. The base steel plate is laid and welded on the bottom of the cabin to facilitate the welding and fixation of the support tool. The limiting device is composed of a bottom steel plate, an I-beam and a square wood, and is arranged at the end of the arch rib segment to limit the longitudinal movement of the arch rib segment. The support tool is arranged in 6 sets, 4 sets are in use, and the remaining 2 sets are adjusted for use according to different lengths of the arch rib segment. The support tool is the main force component for bearing the weight of the arch rib and is also a limiting structure, which is composed of upper and lower half circular clamps. The lower half is fixed on the base steel plate. When loading the ship, the chord pipe of the arch rib is placed in the U-shaped port of the lower half of the tool, the upper half is covered on the chord pipe of the arch rib, and 12 sets of bolts are tightened and fixed. In addition, rubber pads are laid between the tool and the steel pipe to protect the paint of the arch rib, increase the friction, prevent the arch rib segment from sliding during transportation, and ensure the safety of transportation. When the support tool is arranged, the center of gravity line of the arch rib should be coincided with the center line of the ship, and the stress should be basically balanced.

[0021] Further, the specific process of step 4 is that, after the arch rib is loaded and fixed by the support tool, 8 steel wires are crossly and staggeredly bound and fixed. The steel wires are pulled from the lifting lugs of the upper chord pipe and the web member to the ship side column pile or the separately welded fixing lug, and are tightened by a hand-operated hoist. The steel wire clamp is fixed. The steel wire cannot generate a large tension after being tightened. The steel wire is tightened, and the tension of all steel wires should be equal. During the binding process, the steel wire should be prevented from being damaged. During the transportation process, the ship should avoid large angle turning, and all binding points and welding points should be checked regularly.

[0022] Further, the specific process of step 5 is that, the ship adopts anchor positioning and dynamic positioning to ensure the stability of the water construction. The anchor positioning and dynamic positioning are used for positioning construction. The anchor positioning is classified according to the number of anchor lines contacting the ship body, which is divided into single-point anchor positioning system, two-point anchor positioning system and multi-point anchor positioning system. When dynamic positioning is adopted, 2 auxiliary power ships are needed to rely on

[0023] The auxiliary ship power makes the transport ship reach the designated position, the positioning accuracy and stability are affected due to the water flow, and the construction cost is higher than the set value, compared with the dynamic positioning, the several point anchoring positioning has the advantages of less investment, convenient use and maintenance, higher positioning accuracy and good stability, when the several anchor points are positioned, the anchoring construction needs to be carried out for several times, the length of the anchor cable steel wire rope is adjusted to realize the accurate positioning, although the safe, stable and high-precision positioning construction can be realized, the positioning time is long each time, and the arch rib hoisting of the Wujiang super-large bridge is frequent, so that the construction period is prolonged, in the construction, the two positioning modes of the shore anchoring positioning and the positioning ship auxiliary anchoring positioning are adopted according to the basic principle of the several point anchoring positioning, the safe, stable and high-precision positioning is realized, and the positioning efficiency of the ship is improved, so that the bridge is ensured to be completed on schedule.

[0024] Further, the specific process of step 6 is as follows: since the GL1-5 on the south and north banks are on the slopes on both sides of the Wujiang River, combined with the temporary mooring principle of the wharf, the arch rib segment is constructed in the shore anchoring positioning mode, before transportation, the shore is processed according to the position of the cable crane hook, the shore is processed into a V-shaped opening, so that the bow of the ship can abut against the corresponding position, two pre-buried anchors are arranged on both sides of the ship stopping position and used for fixing the transport ship, the pre-buried anchor is a concrete block, a threaded steel reinforcement framework is arranged in the concrete block, and a connecting hole is arranged, when the transport ship is positioned, the transport ship is driven to the shore on the hoisting bridge position from the wharf, the bow part of the ship abuts against the shore, the ship is connected with the pre-buried anchors through the steel wire ropes on both sides, and the attitude of the ship is adjusted through the self-power system and the anchoring steel wire rope according to the position of the cable crane hook, so that the accurate and stable positioning position of the ship is ensured, and then the hoisting operation can be started, in order to prevent sudden strong wind and waves, the ship power system needs to be kept running during hoisting, if the displacement greater than the set value is found, the anchoring steel wire rope is adjusted and corrected, during positioning, since the bow part of the ship has abutted against the shore and is embedded in the shore, the anchoring positioning is realized through the anchors on both sides, as the arch foot on both banks is symmetrically installed towards the midspan section by section, the installed part of the arch rib blocks the positioning position of the transport ship, so that the vertical lifting cannot be realized, only the arch rib segments on the shore on both sides of the bridge can be hoisted, and therefore the hoisting requirement of the arch rib of the whole bridge cannot be met.

[0025] Further, the specific process of step 7 is as follows: when the middle arch rib segment is hoisted, the shore anchoring positioning cannot meet the hoisting requirement, the positioning ship auxiliary anchoring positioning mode is adopted for construction, the general idea is that one special ship is positioned on one side of the hoisting position in advance, the transport ship is driven to the hoisting position and moored on the positioning ship and connected, and the accurate positioning of the transport ship is realized through the fine adjustment of the positioning ship.

[0026] Before the arch rib is transported, four pre-buried anchor points are symmetrically arranged at the equidistant positions on the south and north banks and the bridge center line and used for fixing the positioning ship, the pre-buried anchor is a concrete block, a threaded steel reinforcement framework is arranged in the concrete block, and a connecting hole is arranged.

[0027] The first positioning ship sails to a position slightly downstream of the centerline of the bridge, with its hull parallel to the longitudinal direction of the bridge, completing the preliminary positioning. After the preliminary positioning, the ground anchor and the ship are connected with wire ropes. When connecting, the upstream small pile side anchor is hung first according to the installation position, then the upstream large pile side anchor, and then the downstream small pile and large pile side anchors are hung. After the connection is completed, the length of the four wire ropes is adjusted in sequence by the winch, and the ship is fine-tuned to the downstream position of the cable crane, leaving one ship position for the second positioning ship to berth, so that the first positioning ship is just under the cable crane after berthing. During positioning, the first positioning ship sails near the first positioning ship, levels its hull, and slowly moves the first positioning ship until it is close to the hull of the first positioning ship. It is firmly tied with wire ropes to ensure the stability of the first positioning ship. If there is still deviation in the position at this time, its position can be fine-tuned by adjusting the length of the positioning ship's wire rope to meet the lifting requirements. After the lifting is completed, the first positioning ship leaves, and the positioning ship can be adjusted to the lifting position of the next section.

[0028] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0029] The vertical transportation of the arch ribs of the present invention solves the problem of turning over the arch ribs before lifting. At the same time, various loading and securing measures such as cabin ballasting, arrangement of special transportation equipment, and wire rope lashing and securing also ensure the safety and stability of transportation. The ship's anchoring positioning adopts shore anchoring positioning and positioning ship-assisted anchoring positioning, which not only achieves safe, stable and high-precision positioning, but also improves the ship's positioning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the cabin ballast structure of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the special transport device of the present invention;

[0032] Figure 3 yes Figure 2 AA cross-sectional view;

[0033] Figure 4 This is a schematic diagram of the support tooling structure of the present invention;

[0034] Figure 5 This is a vertical view of the lashing fastening of the present invention;

[0035] Figure 6 It is the shore anchoring positioning diagram of the present invention;

[0036] Figure 7 This is a diagram of a fixed positioning ship with a pre-buried anchor point according to the present invention. DETAILED DESCRIPTION

[0037] For the purposes of the present invention, technical solutions and advantages are more clearly apparent, further detailed below with reference to the drawings and preferred embodiments. However, it should be noted that many details listed in the description are only to enable the reader to have a thorough understanding of one or more aspects of the present invention, and the aspects of the present invention can be implemented without these specific details.

[0038] The method comprises the following steps:

[0039] Step 1: Transport calculation analysis, since the main arch is composed of a circular tubular structure, the height-width ratio is large, the center of gravity is high, and the vertical transportation needs to develop a reliable loading and fixing scheme to ensure the stability and safety of the ship. According to the ship, arch rib and Wujiang geological and hydrological conditions, the arch rib loading and fixing adopts multiple measures such as ship cabin ballast, special transportation device layout, steel wire rope binding and fixing, etc., to ensure the safety and stability of transportation.

[0040] 1) Ship stability analysis According to the “Technical Rules for Statutory Inspection of Inland Ships”, complete stability calculation is carried out, and based on the selected ship model and input calculation parameters, the complete stability criterion result is qualified.

[0041] 2) Fixed strength calculation analysis According to the requirements of “Safety Evaluation Guide for Inland Major Transport Ships”, the strength calculation of the fixing facility is carried out, and the nominal diameter of the selected fixing steel wire rope is 30mm, and the tensile strength is 1 570N / mm2.

[0042] 3) Support tooling calculation analysis The support tooling is the main load-bearing component of the arch rib, which is the key position of transportation safety, and the tooling material adopts Q355D steel. The calculation analysis of this tooling adopts Midas Civil modeling calculation, and the tooling self-weight, segment load and dynamic load coefficient are considered during calculation. After calculation, the maximum combined stress of the tooling is 42.7MPa, and the maximum deformation is <1mm.

[0043] Step 2: Ship cabin ballast, since the center of gravity of the main arch rib segment is high, the overall stability of the ship after loading is reduced, so concrete counterweight blocks need to be used for ballast in the ship cabin to ensure the safety of navigation and transportation. When ballasting, 38 pieces of 2m×2m×0.8m concrete are evenly ballasted around the ship cabin, with a total mass of about 304t, as shown in Figure 1 .

[0044] Step 3: Set up a special transportation device, since the arch rib is composed of a circular tubular structure, in order to fix its position in the cabin, a set of special transportation device (see Figure 2 ) is set up to ensure the safety of transportation. The transportation device includes foundation steel plate, limiting device, support tooling, etc. (see Figure 4). The base steel plate is laid and welded on the bottom of the ship cabin, and the support tool is welded and fixed. The limiting device is composed of bottom steel plate, I-beam and square wood, which is set at the end of the arch rib segment and plays a role in limiting the longitudinal movement of the arch rib segment. The support tool is set with 6 sets, 4 sets are in use, and the remaining 2 sets are adjusted for use with different lengths of arch rib segments. The support tool is the main force component for carrying the weight of the arch rib and is also the main limiting structure, which is composed of upper and lower half circular clamps. The lower half is fixed on the base steel plate, and the arch rib chord pipe is placed in the U-shaped port of the lower half during loading. The upper half is covered on the arch rib chord pipe, and is fixed by 12 sets of M30 bolts. In addition, 20mm thick rubber pads are laid between the tool and the steel pipe to protect the arch rib paint and increase the friction to prevent the arch rib segment from sliding during transportation and ensure the safety of transportation. When the support tool is laid, the center of gravity line of the arch rib should be coincided with the center line of the ship, and the stress should be basically balanced.

[0045] Step 4: Binding and fixing, after the arch rib is loaded and fixed with the support tool, 8 φ30 steel wire ropes are still needed to be cross and staggered to bind and fix, as shown in Figure 4 , the steel wire ropes are pulled from the upper chord pipe lifting lug and the web member to the ship side column pile or the separately welded fixing lifting lug, and are tightened with a hand-operated hoist. The steel wire rope clamp is fixed, and the steel wire rope cannot generate a large tension after being tightened. The steel wire rope is tightened, and the tension of all steel wire ropes should be equal. During the binding process, the steel wire ropes should not be damaged. During transportation, the ship should avoid large angle turning. All binding points and welded points should be checked regularly.

[0046] Step 5: Selection of anchoring positioning mode, the ship mainly adopts anchoring positioning and dynamic positioning to ensure the stability of the water construction, and occasionally adopts the combined mode of anchoring positioning and dynamic positioning for positioning construction. According to the number of anchoring lines in contact with the ship body, anchoring positioning can be divided into single-point anchoring system, two-point anchoring system and multi-point anchoring system. When dynamic positioning is adopted, 2 auxiliary power ships are needed to be put into use to make the transport ship reach the specified position by relying on the power of the auxiliary ships. Due to the influence of water flow, the positioning accuracy and stability are poor, and the construction cost is high. Compared with dynamic positioning, multi-point anchoring positioning has the advantages of less investment, convenient use and maintenance, high positioning accuracy and good stability, and is widely used in construction. When multi-anchor positioning is adopted, multiple anchoring construction is needed to be carried out, and the length of the anchor cable steel wire rope is adjusted one by one to realize accurate positioning. Although safe, stable and high-precision positioning construction can be realized, the positioning time is long each time, and the arch rib hoisting of Wujiang Super Large Bridge is frequent. If this mode is adopted, the construction period will be prolonged.

[0047] Considering the above situation, the basic principle of multi-point anchoring positioning is adopted during the construction of the project, and the two positioning modes of shore anchoring positioning and positioning ship auxiliary anchoring positioning are adopted, which not only realizes safe, stable and high-precision positioning, but also improves the positioning efficiency of the ship, ensuring the completion of the bridge on schedule.

[0048] Step 6: Shore anchoring positioning. Since GL1-5 on the south and north banks are on the slopes of the Wujiang River, combined with the temporary mooring principle of the wharf, the shore anchoring positioning method is used for the construction of the arch rib segments. Before transportation, the shore is processed in advance according to the position of the cable crane hook, and the shore is processed into a V-shaped opening so that the bow of the ship can be docked in this position. Two pre-buried anchors are set on both sides of the ship's docking position to fix the transport ship. The pre-buried anchor is a 1 000mm×1 000mm×2 000mm C30 concrete block with a φ25 threaded steel reinforcement frame and a connecting hole. During transportation positioning, the transport ship drives to the shore of the hoisting bridge position from the wharf, the bow of the ship is docked, the ship is connected to the pre-buried anchors on both sides through steel wire ropes, and the ship's attitude is adjusted according to the position of the cable crane hook through its own power system and anchoring steel wire ropes to ensure that the ship is accurately and stably positioned before hoisting operation can begin. To prevent sudden strong winds and waves, the ship's power system must be kept running during hoisting. If a larger displacement is found, it can be corrected and the anchoring steel wire ropes can be adjusted. When positioning using this method, the bow of the ship is already docked and fitted with the shore, and the ship is positioned by anchoring on both sides of the anchors (see Figure 6 ). The ship positioning stability is good, the positioning accuracy is high, the construction efficiency is high, and the cost is low. Since the arch foot is symmetrically installed from both banks to the midspan in sections, the installed part of the arch rib blocks the positioning position of the transport ship, making it impossible to hoist vertically, and only the arch rib segments on both sides of the bridge on the shore can be hoisted, so it cannot meet the requirements of hoisting the arch rib of the entire bridge.

[0049] Step 7: Positioning ship assisted anchoring positioning. When hoisting the middle arch rib segment, the shore anchoring positioning no longer meets the hoisting requirements, so the positioning ship assisted anchoring positioning method is used for construction. The general idea is to use a special ship to position on one side of the hoisting position in advance, the transport ship drives to the hoisting position and docks on the positioning ship and is connected, and the transport ship is precisely positioned through the fine adjustment of the positioning ship.

[0050] Before the arch rib is transported, four pre-buried anchor points are symmetrically set at equal distances on both the north and south banks and the center line of the bridge to fix the positioning ship (see Figure 7 ). The pre-buried anchor is a 1 000mm×1 000mm×2000mm C30 concrete block with a φ25 threaded steel reinforcement frame and a connecting hole.

[0051] The transport ship sails to the position offset downstream of the bridge center line before construction, and the ship body is parallel to the bridge longitudinal direction to complete the preliminary positioning. After the preliminary positioning, the ground anchors are connected to the ship body by steel wire ropes. When connecting, the upstream small pile number side anchor is hung first according to the installation position, then the upstream large pile number side anchor is hung, and then the downstream small pile number and large pile number side anchors are hung. After the connection is completed, the length of the four steel wire ropes is sequentially adjusted by the winch to slightly adjust the ship to the downstream position of the cable crane, and one ship position is left empty for the positioning ship to berth, so that the positioning ship is just located below the cable crane after berthing. When positioning, the positioning ship sails to the vicinity of the transport ship, levels the ship body, and slowly moves until the ship body is tightly attached to the transport ship body, and is firmly bound by the steel wire rope to ensure the stability of the positioning ship. If there is still deviation at this time, the position of the positioning ship can be slightly adjusted by adjusting the length of the steel wire rope to meet the hoisting requirements. After hoisting is completed, the positioning ship leaves, and the positioning ship can be adjusted to the next segment hoisting position.

[0052] The transport ship is used as a mooring positioning ship, two connection ropes are drawn from the bow and stern of the ship and fixed to the upstream and downstream ground anchors on the north and south banks, and the positioning ship is located just below GL15 in the downstream direction. A concrete block (about 100 kg) is hung at each of the 50-meter and 100-meter positions of each connection rope on the north bank to sink the connection rope into the river by about 10 meters (the maximum water depth of the ship is 5 meters). The reserved channel is about 50 meters wide to ensure navigation requirements.

[0053] Before the components are shipped, four anchor points are symmetrically arranged on the south and north banks and at equal distances from the bridge center line, and fixed objects (1000*1000*2000mm concrete bases) are used as ground anchors. The transport ship is used as a mooring positioning ship, the transport ship sails to the position offset downstream of the bridge center line, and the ship body is parallel to the bridge to complete the preliminary positioning. After the preliminary positioning, the shore anchor steel wire ropes are connected to the ship body in sequence by using connection ropes (according to the installation position, the upstream small pile number side anchor is hung first, then the upstream large pile number side anchor is hung, and then the downstream small pile number and large pile number anchors are hung), and are fixed. The ropes are sequentially adjusted to slightly adjust the ship to the downstream position of the cable crane, and one ship position (positioning ship) is left empty to make the positioning ship just located below the cable crane when in position, and waits for hoisting.

[0054] The transport ship sails to the vicinity of the transport ship, levels the ship body, and slightly adjusts the positioning ship to be tightly attached to the transport ship body by the steel wire rope to ensure the stability of the positioning ship for hoisting.

[0055] Compared with the direct multi-point anchoring positioning method of the transport ship, this positioning method can effectively shorten the positioning time of the transport ship, improve the construction efficiency, and also has the advantages of high positioning accuracy and good stability of the multi-point anchoring positioning. The disadvantage is that one positioning ship is additionally invested, and the anchoring positioning construction cost is slightly higher.

[0056] The main arch rib of Wujiang super-large bridge adopts the upper bearing type steel pipe concrete variable cross-section truss arch with a calculated span of 475 m. The radial height of the main chord tube at the arch top section is 7 m, the radial height of the main chord tube at the arch foot section is 10 m, the radial height of the arch section varies according to a quadratic parabola, the arch rib segment adopts vertical transportation mode, and the ship positioning adopts two positioning methods of shore anchorage positioning and positioning ship auxiliary anchorage positioning. In combination with the construction example of Wujiang super-large bridge, the vertical transportation and anchorage positioning technology of the arch rib segment of the bridge are described.

[0057] The details of the present application are known technologies.

[0058] The above description is only the preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method for vertical transportation and anchoring positioning of steel pipe arch rib segments of a bridge, characterized by: The method comprises the following steps: Step 1: Calculation and analysis of arch rib loading and transportation; Step 2: Ballast the cabin; Step 3: Set up a dedicated transport device; Step 4: Secure the lashing; Step 5: Select anchoring positioning method; Step 6: Anchoring and positioning on the shore; Step 7: Positioning vessel assists in anchoring positioning.

2. The method for vertical transportation and anchoring positioning of steel pipe arch rib segments of a bridge according to claim 1 is characterized in that: The specific process of step 1 is: Step 1.1: Ship stability analysis: A complete stability calculation was performed in accordance with the Technical Rules for the Mandatory Inspection of Inland Waterways Vessels. Based on the selected ship model and input calculation parameters, the complete stability criteria were all qualified. Step 1.2: Calculation and analysis of the securing strength: Calculate the strength of the securing facilities in accordance with the requirements of the "Guidelines for Safety Assessment of Inland Heavy Lift Transport Vessels" to determine the nominal diameter and tensile strength of the selected securing wire rope; Step 1.3: Calculation and analysis of support fixtures. The support fixtures are the load-bearing components of the arch ribs and are key locations for transportation safety. Steel is used as the material for the fixtures. Midas Civil modeling is used for the calculation and analysis of the fixtures. The deadweight of the fixtures, segment loads, and dynamic load coefficients are taken into account during the calculation. Calculations show that the maximum combined stress of the fixtures is 42.7 MPa, and the maximum deformation is less than 1 mm.

3. The method for vertical transportation and anchoring positioning of steel pipe arch rib segments of a bridge according to claim 1 is characterized in that: The specific process of step 2 is as follows: Since the center of gravity of the main arch rib segment is higher than the set value, the overall stability of the ship is reduced after loading. Therefore, it is necessary to use concrete ballast blocks in the cabin to ensure navigation and transportation safety. When ballasting, the concrete is evenly ballasted around the cabin.

4. The method for vertical transportation and anchoring positioning of steel pipe arch rib segments of a bridge according to claim 1 is characterized in that: The specific process of step 3 is as follows: since the arch rib is composed of a combination of circular tubular structures, a set of special transportation equipment is set up to fix the position in the cabin to ensure transportation safety. The special transportation equipment includes a basic steel plate, a limit device and a bracket tooling. The basic steel plate is laid and welded to the bottom of the cabin to facilitate welding and fixing of the bracket tooling. The limit device is composed of a bottom steel plate, an I-beam and square wood. It is set at the end of the arch rib segment to limit the longitudinal movement of the arch rib segment. There are 6 sets of bracket tooling in total, 4 sets are in use, and the remaining 2 sets are adjusted to adapt to different arch rib segment lengths. The bracket tooling is the main load-bearing component that bears the mass of the arch rib and is also a limiting structure. It consists of two semicircular clamps, one upper and one lower. The lower half is fixed on the foundation steel plate. When loading the ship, the arch rib chord is placed in the U-shaped opening of the lower half of the tooling, and the upper half covers the arch rib chord, and is tightened and fixed with 12 sets of bolts. In addition, a rubber pad is laid between the tooling and the steel pipe to protect the arch rib paint while increasing its friction to prevent the arch rib segments from sliding during transportation and ensure transportation safety. When laying out the bracket tooling, it is necessary to ensure that the center of gravity of the arch rib coincides with the center line of the ship, and the force should be basically balanced.

5. The method for vertical transportation and anchoring positioning of steel pipe arch rib segments of a bridge according to claim 1 is characterized in that: The specific process of step 4 is: after the arch rib is loaded and fixed with the bracket tooling, 8 steel wire ropes are still required to be crossed and staggered for lashing and fastening. The steel wire rope is pulled from the upper chord tube lifting eye and the web to the ship's side column pile or the separately welded fastening eye. It is tightened with a hand winch and fixed with a wire rope clamp. After the steel wire rope is tightened, it cannot generate a large pulling force. The steel wire rope can be tightened, and the tension of all steel wire ropes should be equal. The steel wire rope should be avoided from being damaged during the lashing process. During transportation, the ship should avoid large-angle rotation, and all lashing points and welding points should be checked regularly.

6. The method for vertical transportation and anchoring positioning of steel pipe arch rib segments of a bridge according to claim 1 is characterized in that: The specific process of step 5 is: the ship adopts two methods of anchoring positioning and dynamic positioning to ensure the stability of water construction, and adopts a combination of anchoring positioning and dynamic positioning to carry out positioning construction. Anchoring positioning is classified according to the number of contact points between the mooring line and the hull, and is divided into single-point mooring system, two-point mooring system and multi-point mooring system. When dynamic positioning is adopted, two auxiliary power ships are required to rely on the power of the auxiliary ships to make the transport ship reach the designated position. Due to the influence of water flow, the positioning accuracy and stability are affected, and the construction cost is higher than the set value. Compared with dynamic positioning, the use of several points of anchoring positioning is more It requires less investment, is easy to use and maintain, has higher positioning accuracy and good stability. When positioning several anchor points, several anchoring constructions are required, and the length of the anchor cable wire rope is adjusted one by one to achieve precise positioning. Although safe, stable and high-precision positioning construction can be achieved, each positioning time is long, and the frequent lifting of the arch ribs of the Wujiang Super Bridge will lead to an extension of the construction period. During construction, the basic principles of anchoring positioning at several points are combined, and two positioning methods, shore anchoring positioning and positioning ship-assisted anchoring positioning, are adopted. This not only achieves safe, stable and high-precision positioning, but also improves the positioning efficiency of ships, ensuring the completion of the bridge on schedule.

7. The method for vertical transportation and anchoring positioning of steel pipe arch rib segments for bridges according to claim 1 is characterized in that: The specific process of step 6 is as follows: since the south and north banks GL1-5 are on the bank slopes on both sides of the Wujiang River, combined with the temporary mooring principle of the dock, the arch rib segment is constructed using the shore anchoring positioning method. Before transportation, the shore is processed in advance according to the position of the cable crane hook, and the shore is processed into a V-shaped mouth so that the bow can be against the corresponding position. Two pre-buried anchors are set on both sides of the ship's berthing position to fix the transport ship. The pre-buried anchors are concrete blocks with a threaded steel bar skeleton and connecting holes. During transportation positioning, the transport ship travels from the dock to the shore of the lifting bridge position, the bow part is docked, and the two sides of the ship are connected to the pre-buried anchors through wire ropes, and according to the cable lifting The crane hook position is adjusted through its own power system and mooring wire rope to ensure that the ship's positioning is accurate and stable before the lifting operation can be started. In order to prevent sudden strong winds and waves, the ship's power system must be kept running effectively during lifting. If a displacement greater than the set value is found, it must be corrected and the mooring wire rope must be adjusted. During positioning, since the bow part has been docked and embedded with the shore, it is positioned through the anchors on both sides. Since the arch feet on both sides are installed symmetrically in sections towards the middle of the span, some of the installed arch ribs block the positioning position of the transport ship, making vertical lifting impossible. Only some arch rib segments on the shore on both sides of the bridge can be lifted, so the requirements for lifting the arch ribs of the entire bridge cannot be met.

8. The method for vertical transportation and anchoring positioning of steel pipe arch rib segments of a bridge according to claim 1 is characterized in that: The specific process of step 7 is as follows: when hoisting the middle arch rib segment, the shore anchoring positioning no longer meets the hoisting requirements, so the positioning vessel is used to assist in the anchoring positioning. The overall concept is to use a dedicated vessel to be positioned in advance on one side of the hoisting position, and the transport ship will sail to the hoisting position, berth on the positioning vessel and connect with it. The positioning vessel is used for fine-tuning to achieve precise positioning of the transport ship. Before the arch ribs are shipped, four pre-buried anchor points are symmetrically set at equal distances from the north and south banks and the centerline of the bridge to fix the positioning ship. The pre-buried anchors are concrete blocks with threaded steel bar skeletons and connection holes. The first positioning ship sails to a position slightly downstream of the centerline of the bridge, with its hull parallel to the longitudinal direction of the bridge, completing the preliminary positioning. After the preliminary positioning, the ground anchor and the ship are connected with wire ropes. When connecting, the upstream small pile side anchor is hung first according to the installation position, then the upstream large pile side anchor, and then the downstream small pile and large pile side anchors are hung. After the connection is completed, the length of the four wire ropes is adjusted in sequence by the winch, and the ship is fine-tuned to the downstream position of the cable crane, leaving one ship position for the second positioning ship to berth, so that the first positioning ship is just under the cable crane after berthing. During positioning, the first positioning ship sails near the first positioning ship, levels its hull, and slowly moves the first positioning ship until it is close to the hull of the first positioning ship. It is firmly tied with wire ropes to ensure the stability of the first positioning ship. If there is still deviation in the position at this time, its position can be fine-tuned by adjusting the length of the positioning ship's wire rope to meet the lifting requirements. After the lifting is completed, the first positioning ship leaves, and the positioning ship can be adjusted to the lifting position of the next section.

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