Installation method of hanger for long span bridge

Abstract

The present invention relates to bridge construction, in particular to a method for installing and constructing a long-span bridge suspender. The method comprises the following steps: S1, making a conveying and installing device; S2, placing the conveying and installing device on the arch rib, rotating the driving part of the traveling mechanism, so that the upper roller and the lower roller respectively roll in contact with the upper and lower arc surfaces of the arch rib; S3, passing one end of the suspender through the upper clamping shaft wheel assembly and fixing it on the lower clamping shaft wheel assembly; S4, after the conveying and installing device reaches the installation position of the first suspender, adjusting the lower telescopic cylinder of the traveling mechanism so that the box is in a horizontal state; S5, installing the suspender; S6, the upper telescopic cylinder contracts, and the suspender is installed in place; S7, resetting the conveying and installing device, repeating steps S3-S6, and carrying out the installation and construction of the next suspender. The present invention solves the problem that the external PE pipe of the suspender is easily damaged by the lifting equipment during the lifting process, thereby ensuring the construction quality of the bridge, improving the installation accuracy, and improving the construction efficiency.

Description

Technical Field

[0001] The invention relates to bridge construction, in particular to a method for installing a hanger rod of a large-span bridge. Background Art

[0002] In order to ensure the overall stability and aesthetics of the bridge structure, existing large-span bridges mostly adopt a design style that combines beams and slabs with arch rib structures. In order to improve the safety and bearing capacity of the bridge structure, a certain number of hangers are used inside the arch ribs, and the steel strands or prestressed tendons are wrapped with PE pipes on the outside to form hangers that connect the beams and slabs with the arch ribs. The bearing capacity of the bridge is improved by tensioning the hangers. The current construction method generally uses lifting equipment such as truck cranes and crawler cranes to install the hangers by hoisting and then tensioning them. During the hoisting process, the lifting equipment is very likely to cause damage to the PE pipe on the outside of the hanger, which is not very safe and will be affected by the site environment. At the same time, hoisting will greatly reduce construction efficiency.

[0003] The installation of long-span bridge suspenders using cranes is subject to site constraints. Most bridges have rivers flowing beneath them, making the use of cranes impossible. Dry bridges often lie beneath rivers and rainwater collection areas, and the soil is often soaked. This, combined with other factors, results in insufficient bearing capacity on the foundation, making it prone to danger. If cranes were installed on the bridge deck, their outriggers could easily damage the deck, seriously compromising the structural safety of the bridge. The cranes must be constantly moved to install suspenders in different locations, resulting in low efficiency and precision, and the use of large equipment is also risky. Summary of the Invention

[0004] The present invention aims to solve the above technical problems, thereby providing a method for installing and constructing a long-span bridge hanger, thereby improving construction efficiency and safety.

[0005] The present invention solves the technical problem and adopts the following technical solution:

[0006] A method for installing a long-span bridge hanger comprises the following steps:

[0007] S1. Make the conveying and installation device

[0008] The conveying and installation device includes a box with a central through hole, a walking mechanism placed at the four corners of the bottom of the box, and a conveying mechanism placed on the box. The walking mechanism includes an upper roller installed on the bottom surface of the box, a lower roller corresponding to the upper roller and installed on the driving member, and a lower telescopic cylinder installed on the bottom surface of the box and rotatably connected to the driving member. The conveying mechanism includes symmetrically arranged upper telescopic cylinders, upper clamping shaft wheel groups corresponding to the central through hole provided on the upper parts of the two telescopic cylinders, and a lower clamping shaft wheel group in the box.

[0009] S2. The conveying and mounting device is placed on the arch rib, and the driving member of the walking mechanism is rotated so that the upper roller and the lower roller respectively roll in contact with the upper and lower arc surfaces of the arch rib;

[0010] S3. Pass one end of the boom through the upper clamping shaft wheel assembly and fix it on the lower clamping shaft wheel assembly;

[0011] S4. After the transport and installation device reaches the first boom installation position, adjust the lower telescopic cylinder of the walking mechanism to make the box in a horizontal state;

[0012] S5. Install the boom

[0013] Adjust the conveying and installation device so that the central through hole is aligned with the center of the upper embedded part. The clamping wheel of the lower clamping shaft wheel group rotates, driving the boom to move downward. After the lower end of the boom passes through the upper embedded part, the lower clamping shaft wheel group continues to work. When the lower end of the boom reaches the lower embedded part, the lower clamping shaft wheel group stops working. The installer will pass the lower end of the boom through the lower embedded part, and the lower clamping shaft wheel group will continue to work.

[0014] S6. The upper telescopic cylinder is retracted and the boom is installed in place;

[0015] S7: The transport and installation device is reset, and steps S3-S6 are repeated to carry out the installation of the next boom.

[0016] Compared with the prior art, the present invention adopting the above technical solution has the following beneficial effects:

[0017] It solves the problem that the external PE pipe of the boom is easily damaged during the lifting process of lifting equipment, ensures the construction quality of the bridge, improves the installation accuracy and improves the construction efficiency; the conveying and installation device has a simple structure and low cost, reduces the cost of construction machinery and tools, reduces construction costs and improves safety.

[0018] Furthermore, the optimization scheme of the present invention is:

[0019] A central controller is installed in the box.

[0020] The upper roller is rotatably connected to the box body through a wheel shaft and a wheel frame.

[0021] The driving member is installed on a machine base, one end of the machine base is sleeved on the lower end of the telescopic rod of the telescopic cylinder, and a positioning member is provided between the machine base and the telescopic rod.

[0022] The lower telescopic cylinder is a hydraulic cylinder, an electric push rod or an electro-hydraulic push rod.

[0023] The driving component is a reduction motor, and the motor of the reduction motor is a servo motor or a stepping motor.

[0024] The upper clamping shaft wheel assembly includes a fixed sleeve, a longitudinal rod, a transverse rod, a clamping shaft and a clamping wheel. The two fixed sleeves are respectively sleeved on the ends of the telescopic rod of the upper telescopic cylinder. The longitudinal rod is fixed between the two fixed sleeves. One ends of the two horizontally arranged transverse rods are fixed to the longitudinal rod. Multiple clamping shafts are provided between the two transverse rods. The clamping wheel is rotatably mounted on the clamping shaft.

[0025] The treads of the clamping wheel 1 and the clamping wheel 2 are concave arc structures.

[0026] The lower clamping shaft wheel set is installed in the box body, the clamping shaft 2 of the lower clamping shaft wheel set is perpendicular to the clamping shaft 1 of the upper clamping shaft wheel set, and a clamping shaft 2 of the lower clamping shaft wheel set is connected to the clamping wheel 2 through a key and is driven by a drive motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a perspective view of a conveying and installation device according to an embodiment of the present invention;

[0028] Figure 2 It is the front view of the conveying and installation device;

[0029] Figure 3 yes Figure 2 It is the left view;

[0030] Figure 4 yes Figure 2 A top view of

[0031] Figure 5 This is a schematic diagram of an upper arch of a device according to an embodiment of the present invention;

[0032] Figure 6 is a schematic diagram of leveling of a device according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of lowering the first boom according to an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the first boom installed in place according to an embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the second boom installed in place according to an embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of the third boom installed in place according to an embodiment of the present invention;

[0037] Figure 11 This is a schematic diagram of the fourth boom installed in place according to an embodiment of the present invention;

[0038] Figure 12 This is a schematic diagram of the sixth boom installed in place according to an embodiment of the present invention;

[0039] Figure 13 This is a schematic diagram of the seventh boom being installed in place according to an embodiment of the present invention.

[0040] In the figure: box body 1; reduction motor 2; lower roller 3; lower telescopic cylinder 4; upper telescopic cylinder 5; bridge rod 6; upper clamping shaft wheel group 7; fixing sleeve 7-1; longitudinal rod 7-2; transverse rod 7-3; clamping shaft 1 7-4; clamping wheel 1 7-5; center through hole 8; lower clamping shaft wheel group 9; upper roller 10; wheel frame 10-1; beam body 11; arch rib 12; right arch foot 13; left arch foot 14; first hanger 15; second hanger 16; third hanger 17; fourth hanger 18; fifth hanger 19; sixth hanger 20; seventh hanger 21. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below with reference to the accompanying drawings and examples.

[0042] The bridge of this embodiment is a long-span bridge, which is mainly composed of a beam body 11, arch ribs 12, a right arch foot 13, a left arch foot 14 and hangers. Seven hangers are installed between the beam body 11 and the arch ribs 12.

[0043] A method for installing a long-span bridge hanger is carried out in the following steps:

[0044] S1. Make the conveying and installation device

[0045] See also Figures 1-4 The conveying and installation device is mainly composed of a box body 1, a walking mechanism and a conveying mechanism. The box body 1 is in the shape of a flat box, which has a central through hole 8, in which a central controller is installed. The four corners of the bottom of the box body 1 are respectively provided with a walking mechanism, which is mainly composed of a lower roller 3, a reduction motor 2, a lower telescopic cylinder 4 and an upper roller 10. The upper roller 10 is installed on the bottom surface of the box body 1 through an axle and a wheel frame 10-1. The lower telescopic cylinder 4 is arranged vertically, and the upper end of its cylinder body is fixedly connected to the bottom surface of the box body 1. One end of the machine base is sleeved on the lower end of the piston rod of the lower telescopic cylinder 4. The machine base is rotatably connected to the piston rod. A positioning piece is installed between the machine base and the piston rod. The positioning piece can be a set screw. The reduction motor 2 is horizontally installed on the machine base. The output shaft of the reduction motor 2 is installed with the lower roller 3. The lower roller 3 corresponds to the upper roller 10.

[0046] The conveying mechanism is mainly composed of an upper telescopic cylinder 5, an upper clamping shaft wheel group 7 and a lower clamping shaft wheel group 9. The two upper telescopic cylinders 5 are symmetrically installed vertically on one side of the top surface of the box body 1. The lower end of the cylinder body of the upper telescopic cylinder 5 is fixedly connected to the box body 1, and two horizontal bridge rods 6 are installed between the cylinder bodies of the two upper telescopic cylinders 5. The upper clamping shaft wheel group 7 is mainly composed of a fixed sleeve 7-1, a longitudinal rod 7-2, a transverse rod 7-3, a clamping shaft 7-4 and a clamping wheel 7-5. The two fixed sleeves 7-1 are respectively sleeved on the upper end of the piston rod of the upper telescopic cylinder 5. The longitudinal rod 7-2 is welded between the two fixed sleeves 7-1. One end of the two horizontally arranged transverse rods 7-3 is vertically welded to the longitudinal rod 7-2. Three clamping shafts 7-4 are installed between the two transverse rods 7-3. Each clamping shaft 7-4 is rotated to install a clamping wheel 7-5. Each clamping wheel 7-5 can rotate independently. When installing the boom, the boom is inserted between the two inner clamping wheels 7-5 to prevent the boom from deviating. The outer clamping shaft 7-4 and the clamping wheel 7-5 prevent the boom from bending too much, and play a buffering role in the bending of the boom.

[0047] The lower clamping shaft wheel assembly 9 is installed in the housing 1. The two clamping shafts 2 of the lower clamping shaft wheel assembly 9 are perpendicular to the clamping shaft 1 7-4 of the upper clamping shaft wheel assembly 7 and are installed with clamping wheel 2. One clamping shaft 2 of the lower clamping shaft wheel assembly 9 is connected to clamping wheel 2 via a key and is driven by a drive motor. The clamping shaft 2 is rotatably connected to the bottom plate of the housing 1 via a bearing seat. The treads of the clamping wheels 1 and 2 of the lower clamping shaft wheel assembly 9 and the upper clamping shaft wheel assembly 7 are both concave arc structures. The motor of the reduction motor 2 in this embodiment is a servo motor or a stepper motor, and the lower telescopic cylinder is a hydraulic cylinder, an electric push rod, or an electro-hydraulic push rod.

[0048] S2. Rotate the base and the reduction motor 2 by 180 degrees, place the entire device on the arch rib 12 on the side of the right arch foot 13, and then rotate the base and the reduction motor 2 by 180 degrees. Tighten the set screws to position the base and the piston rod of the lower telescopic cylinder 4, thereby positioning the reduction motor 2, so that the upper roller 10 and the lower roller 3 are in rolling contact with the upper and lower arc surfaces of the arch rib 12 respectively ( Figure 5 As shown), the upper roller 10 and the lower roller 3 are made of materials with a high friction coefficient with concrete, and rubber wheels can be used;

[0049] S3, pass one end of the first boom 15 through the two clamping wheels 7-5 inside the upper clamping shaft wheel set 7 and install it on the lower clamping shaft wheel set 9;

[0050] S4. Start the reduction motor 2 of the traveling mechanism. During the movement of the conveying and installing device on the arch rib 12, there will be an error in the position of the lower roller 3 and the upper roller 10 due to the different cross-sectional heights of the arch rib 12. At this time, by adjusting the extension of the piston rod of the lower telescopic cylinder 4, the upper roller 10 and the lower roller 3 can be made to fit closely to the upper and lower arc surfaces of the arch rib 12. The device moves obliquely upward along the arch rib 12. After the conveying and installing device reaches the installation position of the first boom 15, the position of the upper roller 10 and the lower roller 3 is different due to the cross-sectional heights of the arch rib 12, which increases the distance the piston rod of the lower telescopic cylinder 4 extends. The lower telescopic cylinder 4 of the traveling mechanism is adjusted to make the box body 1 in a horizontal state ( Figure 6 shown);

[0051] S5. Install the boom

[0052] Adjust the conveying and installation device so that the central through hole 8 of the box body 1 is aligned with the center of the upper embedded part. The clamping wheel 7-5 of the lower clamping shaft wheel group 9 rotates, driving the first hanging rod 15 to move downward. After the lower end of the first hanging rod 15 passes through the upper embedded part, the lower clamping shaft wheel group 9 continues to work. When the lower end reaches the lower embedded part, the lower clamping shaft wheel group 9 stops working. The installer passes the lower end of the first hanging rod 15 through the lower embedded part, and the lower clamping shaft wheel group 9 continues to work.

[0053] S6, the piston rod of the upper telescopic cylinder 5 is retracted downward, so that the first boom 15 reaches the specified position, and the upper nut and the lower nut of the first boom 15 are installed. The first boom 15 is installed in place and the next tensioning work is carried out;

[0054] S7, the transport installation device is reset, and steps S3-S6 are repeated to complete the installation of the second boom 16, the third boom 17, the fourth boom 18, the fifth boom 19, the sixth boom 20 and the seventh boom 21 in sequence ( Figure 7-13 As shown in FIG5 ), after the seventh hanger 21 is installed, the device arches down from the left arch foot 14 of the arch rib 12.

[0055] The present invention can also install an auxiliary adjustment hydraulic cylinder on the box body 1 to facilitate leveling of the box body 1.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent structural changes made using the contents of the present invention description and drawings are included in the scope of the present invention.

Claims

1. A method for installing a long-span bridge suspender, comprising the following steps: S1. Make the conveying and installation device The conveying and installation device includes a box with a central through hole, a walking mechanism placed at the four corners of the bottom of the box, and a conveying mechanism placed on the box. The walking mechanism includes an upper roller installed on the bottom surface of the box, a lower roller corresponding to the upper roller and installed on the driving member, and a lower telescopic cylinder installed on the bottom surface of the box and rotatably connected to the driving member. The conveying mechanism includes symmetrically arranged upper telescopic cylinders, upper clamping shaft wheel groups corresponding to the central through hole provided on the upper parts of the two telescopic cylinders, and a lower clamping shaft wheel group in the box. The upper clamping shaft wheel assembly includes a fixed sleeve, a longitudinal rod, a transverse rod, a clamping shaft and a clamping wheel. The two fixed sleeves are respectively sleeved on the ends of the telescopic rod of the upper telescopic cylinder. The longitudinal rod is fixedly connected between the two fixed sleeves. One end of two horizontally arranged transverse rods is fixedly connected to the longitudinal rod. A plurality of clamping shafts are provided between the two transverse rods. The clamping wheel is rotatably mounted on the clamping shaft. The lower clamping shaft wheel set is installed in the box body, the clamping shaft 2 of the lower clamping shaft wheel set is perpendicular to the clamping shaft 1 of the upper clamping shaft wheel set, and a clamping shaft 2 of the lower clamping shaft wheel set is connected to the clamping wheel 2 through a key and is driven by a drive motor; S2. The conveying and mounting device is placed on the arch rib, and the driving member of the walking mechanism is rotated so that the upper roller and the lower roller respectively roll in contact with the upper and lower arc surfaces of the arch rib; S3. Pass one end of the boom through the upper clamping shaft wheel assembly and fix it on the lower clamping shaft wheel assembly; S4. After the transport and installation device reaches the first boom installation position, adjust the lower telescopic cylinder of the walking mechanism to make the box in a horizontal state; S5. Install the boom Adjust the conveying and installation device so that the central through hole is aligned with the center of the upper embedded part. The clamping wheel of the lower clamping shaft wheel group rotates, driving the boom to move downward. After the lower end of the boom passes through the upper embedded part, the lower clamping shaft wheel group continues to work. When the lower end of the boom reaches the lower embedded part, the lower clamping shaft wheel group stops working. The installer will pass the lower end of the boom through the lower embedded part, and the lower clamping shaft wheel group will continue to work. S6. The upper telescopic cylinder retracts and the boom is installed in place; S7: The transport and installation device is reset, and steps S3-S6 are repeated to carry out the installation of the next boom.

2. The long-span bridge hanger installation construction method according to claim 1 is characterized in that: A central controller is installed in the box.

3. The long-span bridge hanger installation construction method according to claim 1 is characterized in that: The upper roller is rotatably connected to the box body through a wheel shaft and a wheel frame.

4. The long-span bridge hanger installation construction method according to claim 1 is characterized in that: The driving member is installed on a machine base, one end of the machine base is sleeved on the lower end of the telescopic rod of the telescopic cylinder, and a positioning member is provided between the machine base and the telescopic rod.

5. The long-span bridge hanger installation construction method according to claim 1 is characterized in that: The lower telescopic cylinder is a hydraulic cylinder, an electric push rod or an electro-hydraulic push rod.

6. The long-span bridge hanger installation construction method according to claim 1 is characterized in that: The driving component is a reduction motor, and the motor of the reduction motor is a servo motor or a stepping motor.

7. The long-span bridge hanger installation construction method according to claim 1 is characterized in that: The treads of the clamping wheel 1 and the clamping wheel 2 are both concave arc structures.

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