Arch rib integral lifting and transverse moving ship loading construction method

Abstract

This invention relates to a method for hoisting and laterally moving an arch rib onto a ship. The method involves assembling the arch rib using a scaffolding method on the riverbank, and fixing two temporary crossbeams between the arch feet of the two arch ribs. Two trestle docks are constructed from the arch rib assembly site into the river. Two arch rib transport vessels enter the two docks and are moored and positioned. Four gantry cranes hoist the arch ribs laterally onto the trestle docks, lower them, and secure them to the ships. This invention is not limited by hydrological conditions and allows for flexible selection of the arch rib floating window. When the arch rib is fixed to the ship's supports, the gantry cranes are always in a hoisting state, avoiding the risk of capsizing due to uneven stress at both ends of the arch rib, thus ensuring high safety. The arch ribs are loaded onto the ship quickly, shortening the total construction time.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology and relates to the installation construction of arch ribs for steel structure arch bridges. Specifically, it relates to a construction method in which the arch ribs are lifted and moved laterally onto the ships by a gantry crane when using two ships to float and transport them. Background Technology

[0002] When constructing steel arch bridges across rivers or seas, a common construction method, provided navigation conditions are met, involves the off-site assembly of the arch ribs and the floating transport of the arch ribs to the bridge site by two vessels for installation. For example, patent CN105603861A discloses "An integrally assembled floating and lifting arch bridge and its construction method," which involves setting up two piers in the water, with a barge moored inside each pier. At low tide, ballast water is injected into the barges to lower their height. After the arch ribs are assembled on the shore, they slide onto the piers. Then, at high tide, the two barges dewater and rise, allowing the supports on the barges to align with both ends of the arch ribs and lift them up. The two vessels then float the arch ribs to the bridge site for installation. This method makes full use of water transport conditions, but the following problems exist during construction:

[0003] 1. It is highly dependent on hydrological and weather conditions, and requires waiting for the window of high and low tide levels. Inclement weather will delay the construction period.

[0004] 2. During the process of lifting the arch rib onto the ship, it is difficult to control the synchronicity of the two ships' ascent. If the difference in the lifting height of the two ships exceeds a certain range before the arch rib is fixed to the ship, it will lead to the risk of the arch rib overturning.

[0005] 3. The docking accuracy between the two ends of the arch rib and the ship's support is high. However, when the ship is floating, it is inevitably affected by wind and waves and will sway and rock. The stability and position of the ship are not easy to control, and misalignment is likely to occur. Once docking fails, the ship needs to be re-pressurized and lowered, and then the ship's position needs to be adjusted to drain water and float up again to dock with the arch rib, which makes the process of boarding the arch rib take a long time. Summary of the Invention

[0006] The purpose of this invention is to address the above-mentioned problems by providing a method for hoisting and laterally moving an arch rib onto a ship, thereby reducing the construction difficulty of loading the arch rib onto the ship, accelerating the construction progress, and ensuring construction safety.

[0007] The technical solution of the present invention is as follows:

[0008] A method for hoisting and laterally moving an arch rib onto a ship, characterized by the following steps:

[0009] (1) The arch ribs are assembled on the bank using the bracket method, the cross bracing between the two arch ribs is installed, and two temporary cross beams are fixedly connected between the arch feet of the two arch ribs.

[0010] (2) Two trestle docks are built from the arch rib assembly site to the river. Each trestle dock includes two parallel trestles. The distance between the two trestles is enough to accommodate one arch rib transport ship, thus forming a trestle dock.

[0011] Lay gantry crane tracks at the arch rib assembly site and on the top surface of the trestle bridge;

[0012] (3) The two arch-rib transport ships sailed into the two docks respectively and were moored and positioned, and the arch rib supports were installed on the ships.

[0013] (4) Four gantry cranes are set up between the two arch ribs. Two gantry cranes are set up at each end of the arch rib. The two gantry cranes at each end are connected to the temporary crossbeam between the two arch ribs through hooks.

[0014] (5) Four gantry cranes start at the same time to lift the arch rib as a whole, slide it along the gantry crane track to the trestle, align the legs at both ends of the arch rib with the arch rib support on the ship, and slowly lower the arch rib, supporting the legs at both ends of the arch rib on the arch rib support and connecting and fixing them.

[0015] (6) The gantry crane gradually loosens the hook until the weight of the arch rib is completely transferred to the ship; after confirming that the arch rib is stable, the gantry crane hook is completely released, the gantry crane is dismantled, the two arch rib transport ships sail out of the dock, and the arch ribs are floated to the bridge position for installation.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. Hydrological conditions have little impact on the arch rib loading and construction. The height of the arch rib lifted by the gantry crane can be adjusted arbitrarily and is not limited by the high and low tide water levels. The selection of the arch rib floating and transportation window is more flexible.

[0018] 2. The present invention uses a gantry crane to lower the arch rib onto the ship, which is completely different from the existing technology that uses the ship to raise and lift the arch rib. When the gantry crane lowers the arch rib, it is always in a lifting state before the arch rib is fixed to the support on the ship. This can completely avoid the risk of overturning caused by uneven force on both ends of the arch rib, and the construction safety is high.

[0019] 3. During the lowering of the arch rib, if there is a deviation in the ship's position when the arch rib is connected to the ship's support, the gantry crane can immediately lift the arch rib, readjust the ship's position, and lower the arch rib again. Compared with the existing technology of adjusting the ship's height by filling and draining water inside the ship, this invention can greatly shorten the total construction time. Attached Figure Description

[0020] Figure 1 This is a construction flowchart of the present invention;

[0021] Figure 2 This is a schematic diagram of the plan structure of the arched rib shore assembly and the trestle dock;

[0022] Figure 3 This is a schematic diagram of the plan structure of two barges entering the pier dock and the gantry crane lifting the arch ribs;

[0023] Figure 4 This is a side view structural diagram of the lifting arch rib of the gantry crane;

[0024] Figure 5 This is a front view structural diagram of the lifting arch rib of the gantry crane;

[0025] Figure 6 This is a schematic diagram of the planar structure for placing arch ribs onto the ship using a gantry crane;

[0026] Figure 7 This is a front view schematic diagram of the gantry crane placing arch ribs onto the ship. Detailed Implementation

[0027] Figure 1 This is a construction flowchart of the present invention, and the specific construction method is as follows:

[0028] (1) As Figure 2 As shown, an arch rib assembly site is set up on the bank, and the arch rib 1 is assembled using the bracket method. At the same time, the cross brace 2 between the two arch ribs is installed. After the arch ribs are assembled, two temporary cross beams 3 are fixedly connected between the arch feet of the two arch ribs.

[0029] The temporary crossbeam 3 can be a truss structure, with both ends of the truss welded to the arch ribs respectively.

[0030] (2) Two trestle docks are built from the arch rib assembly site to the river. Each trestle dock includes two parallel trestle bridges 4. The distance between the two trestle bridges 4 is set to accommodate an arch rib transport ship, forming a trestle dock 5.

[0031] Lay 6 gantry crane tracks at the arch rib assembly site and on the top surface of the trestle bridge;

[0032] (3) Figure 3 , Figure 4 , Figure 5 As shown, the two arch-rib transport ships 7 were driven into the two docks and moored and positioned, and arch-rib supports 8 were installed on the two ships respectively.

[0033] (4) Four gantry cranes 9 are set up between the two arch ribs. Two of the four gantry cranes are set up at each end of the arch rib. The two gantry cranes 9 at each end are connected to the temporary crossbeam 3 between the two arch ribs through hooks.

[0034] (5) Figure 6 , Figure 7As shown, four gantry cranes 9 start simultaneously to lift the arch rib 1 as a whole, slide it along the gantry crane track onto the trestle, and precisely adjust the position of the barge by using mooring cables. After aligning the outriggers at both ends of the arch rib 1 with the arch rib supports 8 on the barge 7, the gantry crane slowly lowers the arch rib, supports the outriggers at both ends of the arch rib on the arch rib supports 8, and connects and fixes them by welding or bolting.

[0035] During the process of connecting and fixing the arch rib to the ship's support, the gantry crane always maintains the lifting state of the arch rib to prevent the arch rib from overturning due to the swaying of the two ships or the difference in height caused by wind and waves.

[0036] (6) The gantry crane gradually loosens its hook until the weight of the arch rib 1 is completely transferred to the barge 7; after confirming that the arch rib is stable, the gantry crane hook is completely released, the gantry crane is dismantled, and the two barges 7 sail out of the dock and float the arch rib 1 to the bridge position for installation.

Claims

1. A method for hoisting and laterally moving an arch rib onto a ship, characterized in that, Includes the following steps: (1) The arch ribs are assembled on the bank using the bracket method, the cross bracing between the two arch ribs is installed, and two temporary cross beams are fixedly connected between the arch feet of the two arch ribs. (2) Two trestle docks are built from the arch rib assembly site to the river. Each trestle dock includes two parallel trestles. The distance between the two trestles is enough to accommodate one arch rib transport ship, thus forming a trestle dock. Lay gantry crane tracks at the arch rib assembly site and on the top surface of the trestle bridge; (3) The two arch-rib transport ships sailed into the two docks respectively and were moored and positioned, and the arch rib supports were installed on the ships. (4) Four gantry cranes are set up between the two arch ribs. Two gantry cranes are set up at each end of the arch rib. The two gantry cranes at each end are connected to the temporary crossbeam between the two arch ribs through hooks. (5) Four gantry cranes start at the same time to lift the arch rib as a whole, slide it along the gantry crane track to the trestle, align the legs at both ends of the arch rib with the arch rib support on the ship, and slowly lower the arch rib, supporting the legs at both ends of the arch rib on the arch rib support and connecting and fixing them. (6) The gantry crane gradually loosens the hook until the weight of the arch rib is completely transferred to the ship; after confirming that the arch rib is stable, the gantry crane hook is completely released, the gantry crane is dismantled, the two arch rib transport ships sail out of the dock, and the arch ribs are floated to the bridge position for installation.

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