Arch rib construction method and construction flat car

Abstract

The present invention relates to the technical field of bridge construction. The present invention provides an arch rib construction method and a construction flat car. The flat car comprises a lower flat car and an upper flat car. The lower flat car is slidably connected to a transverse track. A slide rail docked with a longitudinal track is installed on the lower flat car. The upper flat car is slidably connected to the slide rail. The longitudinal track is higher than the transverse track. The double-layer structure of the lower flat car and the upper flat car can provide higher flexibility and space efficiency, improve the steel arch transportation efficiency and construction safety, and transport the arch ribs in a horizontal assembly and horizontal transportation manner, thereby avoiding repeated lifting and turning over during transportation, effectively improving construction efficiency and reducing safety risks.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to an arch rib construction method and a construction flat car. Background Art

[0002] In the construction of steel arch bridges or steel-concrete combined bridges, steel components are usually processed and manufactured in factories and then transported to the construction site for assembly. During the assembly period, it is usually necessary to set up support brackets within the installation range, use cables to lift the arch ribs to the transport barge, and use floating cranes on the water surface to lift the arch ribs on the transport barge to the assembly position. However, the existing technology is often limited by site conditions and the elevation of the arch seat during the transportation and lifting of the arch ribs, resulting in the cable lifting point being unable to directly reach the corresponding installation segment. In addition, it is difficult to adjust the installation position of the arch ribs, which makes it difficult for construction workers to turn over and position the arch ribs for installation, thereby affecting the efficiency of construction. Summary of the invention

[0003] The purpose of the present invention is to provide an arch rib construction method and a construction flat car, which solve the transportation and hoisting problems of the arch rib under the restrictions of site conditions and arch seat elevation.

[0004] The present invention is achieved through the following technical solution: A method for constructing an arch rib, comprising the following steps:

[0005] Step S1, a general assembly field is set on one side of the arch seat, and a transverse track and a longitudinal track are laid between the general assembly field and the arch seat, the transverse track is arranged along the river direction, and the longitudinal track is arranged along the bridge direction;

[0006] Step S2, placing the arch ribs in the assembly field on a flat car through a gantry crane, with the length direction of the arch ribs parallel to the sliding direction of the transverse track;

[0007] Step S3, the flat car first moves along the transverse track to the front of the arch seat, and then moves along the longitudinal track to the end of the trestle;

[0008] Step S4, hoisting the arch rib onto a transport ship by a cable crane;

[0009] Step S5: After the transport ship arrives at the installation position corresponding to the arch rib, the transport ship is positioned, the arch rib is lifted and turned over, and then installed vertically.

[0010] Furthermore, in step S5, lifting points are respectively set at both ends of the length direction of the arch rib, and the lifting point at one end is slowly lowered, and the lifting point at the other end is slowly raised.

[0011] Preferably, the lifting point is connected to the cable crane via a shoulder beam.

[0012] Furthermore, in step S5, the bow and stern of the transport ship are fixed to both banks respectively by dropping anchor and installing figure eight stabilizing ropes.

[0013] A construction flat car comprises a lower flat car and an upper flat car, the lower flat car is slidably connected to a transverse track, a slide rail docking with a longitudinal track is installed on the lower flat car, the upper flat car is slidably connected to the slide rail, and the longitudinal track is higher than the transverse track.

[0014] Furthermore, a lifting mechanism for lifting the upper flat car off the slide rail is provided on the lower flat car.

[0015] Preferably, the lifting mechanism adopts a mating wedge.

[0016] Furthermore, a positioning plate is provided under the lower flat car, a positioning hole is opened on the positioning plate, and the lower flat car is fixed to the foundation by a pin passing through the positioning hole.

[0017] Furthermore, the slide rail and the longitudinal track are matched with mortise and tenon joints.

[0018] Furthermore, the lower flat car is moved by being pulled by a winch, and the upper flat car is driven by a motor to move by itself.

[0019] The present invention has at least the following advantages and beneficial effects:

[0020] (1) By laying transverse and longitudinal tracks between the arch seat and the main assembly site, the arch ribs are transported in a horizontal assembly and horizontal transportation manner, avoiding repeated lifting and turning during transportation, effectively improving construction efficiency and reducing safety risks.

[0021] (2) The double-layer structure of the lower flat car and the upper flat car can provide higher flexibility and space efficiency, thereby improving the steel arch transfer efficiency and construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the plan layout of an arch rib construction method provided by the present invention.

[0023] Figure 2 The present invention provides a cross-sectional view of the overall assembly site in the arch rib construction method.

[0024] Figure 3 A schematic diagram of a gantry hoisting arch rib in an arch rib construction method provided by the present invention.

[0025] Figure 4 A schematic diagram of the movement of an arch rib along a transverse track in an arch rib construction method provided by the present invention.

[0026] Figure 5 A schematic diagram of the movement of an arch rib along a longitudinal track in an arch rib construction method provided by the present invention.

[0027] Figure 6 A schematic diagram of hoisting an arch rib onto a transport ship in an arch rib construction method provided by the present invention.

[0028] Figure 7 A schematic diagram of transporting horizontal arch ribs in an arch rib construction method provided by the present invention.

[0029] Figure 8 The present invention is a schematic structural diagram of a construction flat car provided by the present invention.

[0030] Fig. 9 The present invention provides a side view of a construction flat car.

[0031] Fig.10 The present invention provides a bottom view of a construction flat car.

[0032] Fig.11 A schematic diagram of the docking of a slide rail and a longitudinal movement rail in a construction flat car provided by the present invention.

[0033] Figure numerals: 11-transverse track, 12-longitudinal track, 2-lower flat car, 21-slide rail, 22-lifting mechanism, 23-positioning plate, 230-positioning hole, 3-upper flat car, 4-general assembly site, 5-gantry crane, 6-transport ship, 7-arch rib. DETAILED DESCRIPTION

[0034] The following is a specific implementation method in conjunction with the accompanying drawings.

[0035] Example

[0036] In this embodiment, a method for constructing an arch rib is mainly disclosed, comprising the following steps:

[0037] Step S1: Figure 1 , Figure 2 As shown, a total assembly field 4 is set on one side of the arch seat, and a transverse track 11 and a longitudinal track 12 are laid between the total assembly field 4 and the arch seat. The transverse track 11 is arranged along the river direction, and the longitudinal track 12 is arranged along the bridge direction. Specifically, the total assembly field 4 for assembling the arch rib 7 is usually higher than the arch seat. A hardened foundation flush with the plane of the trestle can be smoothed out by grooving the total assembly field 4 near the arch seat. One end of the transverse track 11 is located at the bottom of the groove excavated in the total assembly field 4, and the other end extends toward the trestle to the vicinity of the longitudinal track 12. As the construction of the trestle progresses, the longitudinal track 12 is laid forward along the bridge, and the trestle is used as a supporting platform.

[0038] Step S2: Figure 3As shown, the arch rib 7 in the assembly field 4 is placed on a flat car through a gantry crane 5, and the length direction of the arch rib 7 is parallel to the sliding direction of the transverse track 11; specifically, two gantry cranes 5 are set, and two lifting wire ropes are set at one main lifting point of each gantry crane 5, and the wire ropes and the arch rib 7 are isolated by cotton wool, nylon cloth, etc. It should be noted that the arch rib 7 adopts the method of horizontal assembly and horizontal transportation, which avoids repeated lifting and turning during transportation, solves the transportation and lifting under the conditions of the site and the height limit of the arch seat, effectively improves the construction efficiency, and reduces the safety risk.

[0039] Step S3: Figure 4 , Figure 5 As shown, the flat car first moves along the transverse track 11 to the front of the arch seat, and then the flat car moves along the longitudinal track 12 to the end of the trestle.

[0040] Step S4: Figure 6 , Figure 7 As shown, the arch rib 7 is hoisted onto the transport ship 6 by a cable crane.

[0041] Step S5: After the transport ship 6 reaches the installation position corresponding to the arch rib 7, the transport ship 6 is positioned, the arch rib 7 is lifted and turned over, and then installed vertically.

[0042] Furthermore, in the specific implementation, in the above step S5 provided in the embodiment of the present invention, lifting points are respectively set at both ends of the length direction of the arch rib 7, one lifting point is slowly lowered, and the other lifting point is slowly lifted. Specifically, the lifting point is connected to the cable crane through a shoulder beam, so that each lifting point can be divided into two lifting points, that is, the cable crane is provided with four lifting points acting on the arch rib 7. After the transport ship 6 transports the arch rib 7 to the lifting area, firstly, the four lifting points simultaneously lift the arch rib 7 segment 1m out of the air, one lifting point is slowly lowered, and the other lifting point is slowly lifted until the fallen lifting point is no longer under force and then it is released, thereby effectively controlling the posture of the arch rib 7 and ensuring the stability and safety of the construction.

[0043] Furthermore, in the specific implementation, in the above step S5 provided in the embodiment of the present invention, the bow and stern of the transport ship 6 are respectively fixed to the two banks by anchoring and installing the figure-eight stabilizing rope, thereby reducing the swing of the transport ship 6 during transportation and installation, and improving the accuracy and safety of lifting.

[0044] like Figure 8-Figure 11As shown, in this embodiment, a construction flat car is also disclosed, and the flat car includes a lower flat car 2 and an upper flat car 3. The lower flat car 2 is slidably connected to the transverse track 11, and a slide rail 21 docking with the longitudinal track 12 is installed on the lower flat car 2. The upper flat car 3 is slidably connected to the slide rail 21, and the longitudinal track 12 is higher than the transverse track 11. Specifically, the lower flat car 2 and the upper flat car 3 are both frame structures and are provided with roller walking structures. The lower flat car 2 is pulled and moved by a winch, and the upper flat car 3 is driven by a motor to walk by itself. The double-layer structure of the lower flat car 2 and the upper flat car 3 can provide higher flexibility and space efficiency, reduce the number of hoisting times, and improve the steel arch transportation efficiency and construction safety.

[0045] Furthermore, in a specific implementation, a lifting mechanism 22 for lifting the upper flat car 3 off the slide rail 21 is provided on the above-mentioned lower flat car 2 provided in the embodiment of the present invention. Preferably, the lifting mechanism 22 adopts a mating wedge. Specifically, the mating wedge can be evenly force-bearingly arranged at multiple positions between the lower flat car 2 and the upper flat car 3. The mating wedge can adopt the existing technology, usually composed of an upper support, a lower support, a left support and a right support. The cross-sections of these supports are all isosceles trapezoids. The upper support is tightly connected to the lower support, and the left support is tightly connected to the right support. By adjusting the wedge-shaped matching position of each support, the lifting and lowering of the upper flat car 3 is achieved. When the lower flat car 2 slides on the transverse track 11, the lifting mechanism 22 lifts the upper flat car 3 to make it off the slide rail 21. When the slide rail 21 reaches the docking position, the lifting mechanism 22 lowers the upper flat car 3 to make it fall on the slide rail 21, which effectively improves the reliability and safety of the device.

[0046] Furthermore, in the specific implementation, Figure 1 As shown, a positioning plate 23 is provided under the lower flat car 2 provided in the embodiment of the present invention, and a positioning hole 230 is provided on the positioning plate 23. The lower flat car 2 is fixed to the foundation by a bolt passing through the positioning hole 230. Specifically, corresponding holes are pre-buried on the foundation. When the lower flat car 2 reaches a suitable position, it is fixed by a bolt, which effectively prevents the lower flat car 2 from being displaced during operation, and helps to improve the overall work safety and stability.

[0047] Furthermore, in the specific implementation, Figure 1 As shown, the slide rail 21 and the longitudinal track 12 provided in the embodiment of the present invention are matched with mortise and tenon joints. Specifically, the slide rail 21 and the longitudinal track 12 can be in different lengths at the ends where they are connected, and it is ensured that the slide rail 21 does not interfere with the longitudinal track 12 when it slides, so that the connection between the slide rail 21 and the longitudinal track 12 is more secure, and at the same time, it is also convenient for the slide rail 21 to be positioned and connected with the longitudinal track 12.

Claims

1. An arch rib construction method, characterized in that: The following steps are involved: Step S1, a general assembly field (4) is set on one side of the arch seat, and a transverse track (11) and a longitudinal track (12) are laid between the general assembly field (4) and the arch seat, wherein the transverse track (11) is arranged along the river direction, and the longitudinal track (12) is arranged along the bridge direction; Step S2, placing the arch rib (7) in the general assembly field (4) on a flat car through a gantry crane (5), wherein the length direction of the arch rib (7) is parallel to the sliding direction of the transverse track (11); Step S3, the flat car first moves along the transverse track (11) to the front of the abutment, and then moves along the longitudinal track (12) to the end of the trestle; Step S4, hoisting the arch rib (7) onto the transport ship (6) by means of a cable crane; Step S5: After the transport ship (6) reaches the installation position corresponding to the arch rib (7), the transport ship (6) is positioned, the arch rib (7) is lifted and turned over, and then installed vertically.

2. The arch rib construction method according to claim 1, characterized in that: In the step S5, lifting points are respectively set at both ends of the arch rib (7) in the length direction, the lifting point at one end is slowly lowered, and the lifting point at the other end is slowly raised.

3. The arch rib construction method according to claim 2, characterized in that: The lifting point is connected to the cable crane via a shoulder pole beam.

4. The arch rib construction method according to claim 1, characterized in that: In the step S5, the bow and stern of the transport ship (6) are respectively fixed to the two banks by dropping anchor and installing figure eight stabilizing ropes.

5. A construction flat car based on the arch rib construction method according to any one of claims 1 to 4, characterized in that: The flat car comprises a lower flat car (2) and an upper flat car (3), the lower flat car (2) is slidably connected to the transverse track (11), the lower flat car (2) is provided with a slide rail (21) docking with the longitudinal track (12), the upper flat car (3) is slidably connected to the slide rail (21), and the longitudinal track (12) is higher than the transverse track (11).

6. The construction flat car according to claim 5, characterized in that: The lower flat car (2) is provided with a lifting mechanism (22) for lifting the upper flat car (3) off the slide rail (21).

7. The construction flat car according to claim 6, characterized in that: The lifting mechanism (22) adopts a mating wedge.

8. The construction flat car according to claim 5, characterized in that: A positioning plate (23) is provided under the lower flat car (2), a positioning hole (230) is provided on the positioning plate (23), and the lower flat car (2) is fixed to the foundation by a pin penetrating the positioning hole (230).

9. The construction flat car according to claim 5, characterized in that: The slide rail (21) and the longitudinal movement rail (12) are matched with mortise and tenon joints.

10. The construction flat car according to claim 5, characterized in that: The lower flat car (2) is moved by being pulled by a winch, and the upper flat car (3) is driven by a motor to move itself.

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