Construction method for different-position assembling, overall transporting and overall lifting of arch ribs

Abstract

The invention provides a construction method for different-position assembling, overall transporting and overall lifting of arch ribs, and belongs to the technical field of bridge construction, and the method comprises the following steps: erecting an assembling bracket, mounting a sliding rail, assembling the arch ribs to be closed, tensioning a temporary tie bar, integrally sliding the arch ribs to a ship, integrally floating the arch ribs in place, integrally lifting the arch ribs, and welding arch feet. And converting the system. The main arch is assembled on the land in different positions, and the open space near the bridge site is used as an assembly site, so that the influence on current navigable ships is greatly reduced, and the accuracy and the safety of arch rib assembly are improved.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a method for the dislocation, assembly, overall transportation, and overall lifting of arch ribs. Background Technology

[0002] For small- to medium-span arch bridges, the arch ribs are typically constructed using three methods: the scaffolding method, the integral launching method, and the floating crane integral lifting method. The scaffolding method significantly impacts navigation, the launching method requires sufficient space on the approach bridge side and the temporary piers also affect navigation, and the floating crane integral lifting method requires large floating crane equipment, which is costly. When navigation conditions must be guaranteed at the bridge site, the space on the approach bridge side is limited, and there is a lack of large lifting equipment or the lifting equipment is expensive, how to achieve the smooth installation of the arch ribs is an urgent problem to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide a method for the off-site assembly, overall transportation, and overall lifting of arch ribs, solving the technical problems of existing arch rib construction methods such as the support method, the overall jacking method, and the floating crane overall lifting method. The support method has a significant impact on navigation, the jacking method requires sufficient space on the approach bridge side and the temporary piers also have a certain impact on navigation, and the floating crane overall lifting method requires the use of large floating crane equipment, which has high equipment costs.

[0004] This invention enables the installation of arch ribs across rivers and streams while reducing construction risks and costs, and shortening the construction period. The prerequisite for its application is the availability of assembly sites on nearby banks.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for the displaced assembly, overall transportation, and overall lifting of arch ribs, the method comprising the following steps:

[0007] Step 1: Erecting the scaffolding and installing the sliding rails;

[0008] Step 2: Assemble the arch ribs until closure, and tension the temporary tie rods;

[0009] Step 3: The arch ribs are slid onto the ship as a whole;

[0010] Step 4: The arch ribs are floated and positioned as a whole;

[0011] Step 5: Lift the arch ribs as a whole;

[0012] Step 6: Arch foot welding, system conversion.

[0013] Further, in step 1, select a suitable site for assembling the arch rib at the bridge site, set up counterforce piers at the arch foot of the assembly site, set up two rows of walking wheel support frames as positioning supports for the first segment, and set up vertical support frames. The track is set at the bottom of the walking wheel support frame and extends towards the river bank. The track is perpendicular to the main axis of the arch rib and is connected to the track of the transport ship to realize the overall sliding of the arch rib onto the ship.

[0014] Further, in step 1, set up a retaining wall at the position of the river bank track to ensure the stability of the track position and provide a pulling force for the transport ship when the arch rib is being slid onto the ship.

[0015] Further, in step 2, after the arch rib is assembled on the support frame, install temporary tie rods with one end anchored to the lower chord of the first segment. Gradually apply tension to the tie rods according to the calculated thrust to transfer the horizontal thrust of the arch rib from the counterforce piers to the temporary tie rods, achieving self-balancing of the horizontal force of the arch rib.

[0016] Further, in step 3, the two transport ships are docked in place and adjusted until the transport ship track is accurately connected to the assembly site track in terms of elevation and plan position. After docking, set up force transmission rods between the transport ship and the retaining wall to prevent the transport ship from moving towards the shore when the arch rib is being loaded onto the ship.

[0017] The arch rib is slid onto the transport ship using a through-type jack combined with steel wire. During the sliding process, the arch rib on both sides needs to be kept in synchronization and cannot be twisted.

[0018] Further, in step 4, after the arch rib is slid onto the ship, take measures such as welding or bolting to fix the positioning supports to prevent the arch rib from moving during transportation. During the floating transportation of the arch rib, the synchronization and stability of the two transport ships need to be precisely controlled to cope with natural factors such as water flow and wind.

[0019] Further, in step 5, install lifting frames on the top of the main piers on both banks. After the arch rib is transported into position, take contact fixation measures and use several lifting devices to gradually lift the main arch to the predetermined height and accurately connect it to the pre-buried segment of the arch foot installed at the pier. During the overall lifting stage, the coordination of the lifting devices needs to be controlled to ensure synchronized operation of multiple lifting devices.

[0020] Further, in step 6, after the arch rib arch foot is welded and fixed to the pre-buried segment, the temporary tie rods are removed, and the installation of the arch rib is completed.

[0021] The construction method comprises the following steps: using the vacant land near the bridge site as an assembling site of the arch rib, erecting a support to assemble the arch rib, sliding the arch rib to two transport ships through a pre-laid track by a pulling method after the arch rib is assembled and closed, and then integrally floating the arch rib to the bridge site through the water, and integrally lifting the arch rib to the design position through a lifting frame erected at the bridge pier.

[0022] The present application has the following beneficial effects due to the adoption of the above technical scheme:

[0023] (1) The main arch is assembled at a land site, the vacant land near the bridge site is used as the assembling site, the influence on the existing navigation vessels is greatly reduced, and the assembling precision and safety of the arch rib are improved.

[0024] (2) The double-ship integral floating mode is adopted, the large transport ship required by the single-ship transportation is avoided, the specification of the transport ship is reduced, the equipment cost is saved, the transverse span of the double-ship transportation is large, the anti-overturning stability during the integral transportation of the arch rib is improved, the transport ship is perpendicular to the main shaft of the arch rib, the arch rib can be smoothly put into the bridge hole and positioned without interference with the main pier, the pulling method is used for sliding onto the ship, large floating cranes are not needed for hoisting, the equipment cost is reduced, and the hoisting stability is improved.

[0025] (3) The lifting frame is erected at the main pier position, four hoisting points are arranged on each bank, the arch rib is integrally lifted to the design position, the arch rib is conveniently positioned and adjusted, high-precision installation is realized, and the equipment cost caused by the use of large floating cranes is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a method flowchart of the present application;

[0027] Figure 2 is an assembling site layout site map of the present application;

[0028] Figure 3 is an arch rib assembling into an arch structure site map of the present application;

[0029] Figure 4 is an arch rib assembling into an arch overall site map of the present application;

[0030] Figure 5 is an arch rib integral sliding on a track site map of the present application;

[0031] Figure 6 is an arch rib integral sliding onto a ship site map of the present application;

[0032] Figure 7 is an arch rib integral floating to a bridge site site map of the present application;

[0033] Figure 8is the on-site diagram of the overall lifting of the arch rib of the present application;

[0034] Figure 9 is the on-site diagram of the overall lifting positioning of the arch rib of the present application;

[0035] Figure 10 is the on-site diagram of the overall lifting positioning of the arch rib of the present application;

[0036] Figure 11 is the elevation view of the arch rib assembly of the present application;

[0037] Figure 12 is the schematic diagram of the arch rib being slid onto a ship of the present application;

[0038] Figure 13 is the schematic diagram of the arch rib having been slid onto a ship of the present application;

[0039] Figure 14 is the schematic diagram of the arch rib being floated by two ships of the present application;

[0040] Figure 15 is the schematic diagram of the arch rib being transported and positioned of the present application;

[0041] Figure 16 is the schematic diagram of the arch rib being lifted and positioned of the present application.

[0042] In the figure, 1 is the main arch rib, 2 is the assembly support, 3 is the temporary tie rod, 4 is the positioning support, 5 is the counter-force pier, 6 is the walking wheel, 7 is the sliding track, 8 is the retaining wall, 9 is the force transmission rod, 10 is the steel strand, 11 is the ship sliding track, 12 is the transport ship, and 13 is the jack. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below with reference to the drawings and preferred embodiments. However, it should be noted that many details in the description are only for the reader to have a thorough understanding of one or more aspects of the present application, and the aspects of the present application can be realized even without these specific details.

[0044] As shown in Figures 1-16 , a construction method for arch rib ectopic assembly, overall transportation and overall lifting, the method comprising the following steps:

[0045] (1) The support method is used to select a suitable assembly site near the bridge site to assemble the arch rib, counter-force piers are arranged at the arch foot of the assembly site, and the arch foot end is abutted against the counter-force pier when the first segment of the arch rib is installed to prevent longitudinal displacement of the arch rib during installation.

[0046] (2) The first section is provided with a positioning support, the bottom of the support is provided with two rows of running wheels, a sliding track is laid under the corresponding position, the track is perpendicular to the main shaft line of the arch rib and extends outward to the river bank, and the track is subsequently connected with the track of the transport ship to realize the overall sliding of the arch rib onto the ship.

[0047] (3) The position of the track on the bank is provided with a retaining wall, which can not only guarantee the stability of the bank slope at the position of the track, but also provide a pulling resistance for the transport ship when the overall arch rib slides onto the ship, as shown in Figure 3

[0048] (4) After the arch rib is assembled into an arch on the support, a temporary tie rod is installed, the ends of the tie rod are anchored to the lower chord of the first section, the tie rod tension is gradually applied according to the calculated thrust, the horizontal thrust of the arch rib is transferred from the counterforce pier to the temporary tie rod, and the arch rib is self-balanced under horizontal force, as shown in Figure 4

[0049] (5) The two transport ships are docked in position, and the position of the transport ship is adjusted until the transport ship track is accurately connected with the track at the assembly site in terms of elevation and plane position; after being docked, a force transmission rod is arranged between the transport ship and the retaining wall to prevent the transport ship from moving towards the bank side when the arch rib is loaded onto the ship.

[0050] (6) The arch rib is slid onto the transport ship by using a through-type jack in cooperation with a steel strand, and the arch rib on both sides needs to be kept synchronous during the sliding process and cannot be twisted, as shown in Figure 5

[0051] (7) After the arch rib is slid onto the ship, welding or bolting measures are taken to fix the positioning support to prevent the arch rib from moving during transportation. During the floating transportation of the arch rib, the synchronization and stability of the two transport ships need to be accurately controlled to cope with the interference of natural factors such as water flow and wind force, as shown in Figures 6-7

[0052] (8) Lifting frames are installed on the top of the main piers on both banks, after the arch rib is transported and positioned, contact fixation measures are taken, 8 large lifting equipment are used to gradually lift the main arch to the predetermined height, and accurate connection is made with the arch foot pre-buried section that has been installed at the pier. During the overall lifting stage, the coordination of the lifting equipment needs to be controlled to keep the multiple lifting devices working synchronously, as shown in Figures 8-9

[0053] (9) After the arch rib arch foot and the pre-buried section are welded and fixed, the temporary tie rod is removed, and the installation of the arch rib is completed, as shown in Figure 10

[0054] ​​​​​​The device for realizing the method comprises assembling supports 2, temporary tie bars 3, positioning supports 4, counterforce piers 5, walking wheels 6, sliding tracks 7, retaining walls 8, force transmission bars 9, steel strands 10, boat sliding tracks 11, transport boats 12 and jacks 13, the assembling supports 2 are provided in plurality, are arranged at intervals in height, are arranged at the bottom of the main arch rib 1, the positioning supports 4 are arranged at the two ends of the main arch rib 1, play a role of supporting the two end portions of the main arch rib 1, the counterforce piers 5 are arranged outside the positioning supports 4, the bottommost portions of the two ends of the main arch rib 1 are supported by the counterforce piers 5 in a counter-support structure, the counterforce piers 5 are arranged in a slope structure, the sliding tracks 7 are arranged at the bottom of the positioning supports 4 and extend to the river bank, the sliding tracks 7 are provided with the retaining walls 8 at the junctions with the river water, the transport boats 12 are connected with the retaining walls 8 through the force transmission bars 9, the boat sliding tracks 11 are arranged on the transport boats 12, the boat sliding tracks 11 and the sliding tracks 7 are arranged on the same straight line, the jacks 13 are arranged at the outer ends of the transport boats 12, and the jacks 13 are connected with the main arch rib 1 through the steel strands 10, as shown in Figures 11-16

[0055] The remaining matters of the present application are the known art.

[0056] The above description is only the preferred embodiment of the present application, and it should be pointed out that, for the ordinary skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.​

Claims

1. A method for the displaced assembly, overall transportation, and overall lifting of arch ribs, characterized in that: The method includes the following steps: Step 1: Erecting the scaffolding and installing the sliding rails; Step 2: Assemble the arch ribs until closure, and tension the temporary tie rods; Step 3: The arch ribs are slid onto the ship as a whole; Step 4: The arch ribs are floated and positioned as a whole; Step 5: Lift the arch ribs as a whole; Step 6: Arch foot welding, system conversion.

2. The method for displaced assembly, overall transportation, and overall lifting of arch ribs according to claim 1, characterized in that: In step 1, a suitable site for assembling the arch rib is selected near the bridge site. Reaction piers are set at the arch foot of the assembly site, and two rows of traveling wheel support frames are set as positioning supports for the first segment. Vertical support frames are also set, and the track is set at the bottom of the traveling wheel support frames and extends towards the river. The track is perpendicular to the main axis of the arch rib and is subsequently connected to the track of the transport ship to realize the overall sliding of the arch rib onto the ship.

3. The method for displaced assembly, overall transportation, and overall lifting of arch ribs according to claim 1, characterized in that: In step 1, a retaining wall is set up at the location of the track on the bank. This can not only ensure the stability of the bank slope at the track location, but also provide a dragging reaction force to the transport ship when the arch rib slides onto the ship as a whole.

4. The method for displaced assembly, overall transportation, and overall lifting of arch ribs according to claim 1, characterized in that: In step 2, after the arch rib is assembled into an arch on the support, temporary tie rods are installed. The two ends of the tie rods are anchored to the lower chord of the first segment. The tie rod tension is gradually applied according to the calculated thrust to transfer the horizontal thrust of the arch rib from the reaction pier to the temporary tie rods, thereby achieving self-balance of the horizontal force of the arch rib.

5. The method for displaced assembly, overall transportation, and overall lifting of arch ribs according to claim 1, characterized in that: In step 3, the transport ships on both sides are brought to their positions on the shore and their positions are adjusted until the transport ship tracks are precisely aligned with the assembly yard tracks in terms of elevation and planar position. After positioning, dowel bars are installed between the transport ships and the retaining wall to prevent the transport ships from moving to the shore when the arch ribs are loaded onto the ships. Using a through-hole jack and steel strands, the arch rib is slid from the shore assembly yard to the transport ship as a whole. During the sliding process, both sides of the arch rib must remain synchronized and must not be twisted.

6. The method for displaced assembly, overall transportation, and overall lifting of arch ribs according to claim 1, characterized in that: In step 4, after the arch rib is slid onto the ship, welding or bolting measures are taken to fix the positioning bracket to prevent the arch rib from moving during transportation. During the floating process of the arch rib, the synchronization and stability of the two transport ships need to be precisely controlled to cope with the interference of natural factors such as water flow and wind.

7. The method for displaced assembly, overall transportation, and overall lifting of arch ribs according to claim 1, characterized in that: In step 5, lifting frames are installed on the tops of the main piers on both sides. After the arch ribs are transported and positioned, contact fixing measures are taken. Several lifting devices are used to gradually lift the main arch to the predetermined height and precisely connect it with the pre-embedded arch foot section that has been installed at the pier. During the overall lifting stage, the coordination of the lifting devices needs to be controlled to ensure that multiple lifting devices operate synchronously.

8. The method for displaced assembly, overall transportation, and overall lifting of arch ribs according to claim 1, characterized in that: In step 6, after the arch rib foot is welded and fixed to the embedded section, the temporary tie rod is removed to complete the installation of the arch rib.

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