Construction method of fabricated truss

Abstract

The invention discloses a construction method of a fabricated truss, which belongs to the technical field of box girder construction, and comprises the following steps: two groups of guide rails are symmetrically laid on a bridge floor of a box girder, and the guide rails extend along the length direction of the box girder to provide guidance for a load-bearing main truss; the two bearing main trusses are correspondingly installed on the two sets of guide rails and used for supporting the spraying maintenance device, traction devices are arranged at the front ends of the two bearing main trusses in the advancing direction and used for providing traction force, the two traction devices operate synchronously, and the two ends of a tray are connected with the two sets of bearing main trusses through hanging rods correspondingly; and a plurality of groups of opposite-pulling devices or inclined-pulling devices are arranged between the two bearing main trusses, so that the two groups of trusses are prevented from inclining outwards. Construction is simple, installation is convenient, sliding power is provided for the load-bearing main trusses through the traction mechanism, the two load-bearing main trusses are kept to move forwards synchronously during use, the technical problem that safety burden is caused to a hanging basket is solved, and the hanging basket can move forwards along with a spraying maintenance system at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of box beam hanging basket construction, and in particular relates to a construction method for an assembled truss. Background Art

[0002] In the existing box girder hanging basket method of construction, the spray curing system relies on the hanging basket assembly for installation and fixation, and maintains the box girder. However, the combination of the spray curing system and the hanging basket will inevitably increase the structural load of the hanging basket, increase the hanging basket cost, and cause a safety burden on the hanging basket. The spray curing system needs to be separated from the hanging basket. Therefore, a separate set of assembled trusses is urgently needed to provide power and structural support for the spray curing system. The existing trusses can only provide support and cannot move forward with the spray curing system. Summary of the invention

[0003] In order to solve the above problems, the present invention adopts the following technical solutions:

[0004] A construction method for an assembled truss comprises the following steps:

[0005] S10, symmetrically laying two sets of guide rails on the bridge deck of the box girder, wherein the guide rails extend along the length direction of the box girder to provide guidance for the load-bearing main trusses;

[0006] S20, installing two load-bearing main trusses on two sets of guide rails respectively, the two load-bearing main trusses are used to provide support for the spray curing device, and the two load-bearing main trusses are respectively provided with traction devices at the front ends in the travel direction to provide traction force. When traveling, the two traction devices are operated synchronously to ensure that the load-bearing main trusses on both sides move forward synchronously;

[0007] S30, connecting the two ends of the water collection and recovery tray disposed on the lower side of the bottom of the box beam to the two load-bearing main trusses through suspension rods;

[0008] S40. Install multiple sets of tension devices between the sides of the two load-bearing main trusses that are close to each other, or set multiple sets of inclined-stayed devices on the side of each set of load-bearing main trusses that is away from the bridge edge, one end of each set of inclined-stayed devices is connected to the corresponding load-bearing main trusses, and the other end is connected to the embedded ring on the box girder surface, so as to prevent the two sets of load-bearing main trusses from tilting toward the outside of the box girder.

[0009] Further, in step S10, each set of guide rails includes:

[0010] A support rail, which is installed on the bridge deck and extends along the length direction of the box girder;

[0011] The inverted guide rail is arranged on a side of the supporting guide rail away from the side of the box beam and is arranged parallel to the supporting guide rail.

[0012] Furthermore, in step S20, the installation steps of the load-bearing main truss are:

[0013] S21. According to the force calculation, the structure of the truss is designed. After the specifications are determined, welding of multiple different plane trusses is performed in the factory, each of which is composed of vertical bars, diagonal bars, horizontal bars and stiffening plates;

[0014] S22, assembling a plurality of different plane trusses into a load-bearing main truss as a whole by bolts at the construction site;

[0015] S23, installing the driving wheel on the supporting guide rail, and connecting it to the load-bearing main truss through the load-bearing wheel vertical rod, installing the driven wheel on the reverse guide rail, and connecting it to the load-bearing main truss through the reverse wheel vertical rod.

[0016] Further, in step S20, the traction device is a motor drive assembly, a fall chain or an electric hoist.

[0017] Furthermore, in step S30, a U-shaped groove is opened at the end of the square steel on one side of each load-bearing main truss extending out of the box girder, and a sealing member is installed at the open end of the U-shaped groove. The first end of the hanger is connected to the pallet, and the second end of the hanger is provided with an external thread. The second end of the hanger passes through the U-shaped groove and is fixed by a first nut.

[0018] Furthermore, a washer or a channel steel block is arranged between the first nut and the load-bearing main truss, and the extension direction of the channel steel block is arranged perpendicular to the U-shaped notch.

[0019] Furthermore, the sealing member is a steel bar or a steel plate, and is welded to the opening side of the U-shaped notch.

[0020] Furthermore, the sealing member is a fixing bolt, and two through holes are correspondingly opened on the side walls on both sides of the U-shaped notch, and the fixing bolt passes through the through holes in sequence and is fixed by the second nut.

[0021] Furthermore, the pulling device is a steel wire rope, a steel wire rope clamp at a first end of the steel wire rope is fixed to one of the load-bearing main trusses, and a second end is fixedly connected to another load-bearing main truss via a basket bolt.

[0022] Furthermore, at least two hanging points are arranged between each of the load-bearing main trusses and the pallet.

[0023] Beneficial effects:

[0024] The present invention is simple to construct and easy to install, and provides a set of independent assembled trusses. The traction mechanism provides sliding power for the load-bearing main trusses, and the two load-bearing main trusses are kept moving forward synchronously during use, thereby solving the technical problem of causing safety burden to the hanging basket, and the hanging basket can also move forward simultaneously with the spraying maintenance system.

[0025] The present invention ensures the stability of the load-bearing main trusses during movement and reduces the risk of tipping outward by arranging multiple groups of tensioning devices between two groups of load-bearing main trusses.

[0026] The present invention provides U-shaped notches at the ends of the square steels on one side of the load-bearing main truss extending outside the box beam, so that installation of the hangers at both ends is faster and more convenient. A sealing piece is installed on the open side of the U-shaped notch to fix the hanger and improve the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The overall structure of the main truss of the hanger of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 2 The overall structure of the main truss of the hanger of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 3 This is a schematic diagram of the suspension point structure of the present invention;

[0030] Figure 4 It is a schematic diagram of the blocking method of the suspension rod in the present invention;

[0031] Figure 5 for Figure 4 1-1 is a schematic diagram of the cross section;

[0032] Figure 6 It is a schematic diagram of another blocking method of the suspension rod in the present invention.

[0033] Among them, 1. load-bearing main truss; 2. cross bar; 3. vertical bar; 4. diagonal bar; 5. stiffening plate; 6. load-bearing wheel vertical bar; 7. driving wheel; 8. buckle wheel vertical bar; 9. driven wheel; 10. suspension rod; 11. U-shaped notch; 12. channel steel pad; 13. fixing bolt; 14. tension device; 15. steel bar or steel plate; 16. diagonal tension device. DETAILED DESCRIPTION

[0034] Example 1

[0035] refer to Figure 1-Figure 6 , a construction method of an assembled truss, comprising the following steps:

[0036] S10, symmetrically laying two sets of guide rails on the bridge deck of the box girder, the guide rails extending along the length direction of the box girder to provide guidance for the load-bearing main truss 1;

[0037] S20, two load-bearing main trusses 1 are correspondingly installed on two sets of guide rails to provide support for the spray curing device. The two load-bearing main trusses 1 are respectively provided with traction devices at the front ends in the travel direction to provide traction force. When traveling, the two traction devices are operated synchronously to ensure that the load-bearing main trusses 1 on both sides move forward synchronously;

[0038] S30, connecting the two ends of the water collection and recovery tray disposed on the lower side of the beam bottom to the two sets of load-bearing main trusses 1 through the suspension rods 10 respectively;

[0039] S40. Install multiple groups of tension devices 14 between the two load-bearing main trusses 1, or set multiple groups of inclined-stayed devices 16 on the side of each group of load-bearing main trusses away from the bridge edge, one end of each group of inclined-stayed devices 16 is connected to the corresponding load-bearing main trusses, and the other end is connected to the embedded ring of the box girder surface, so as to prevent the two groups of load-bearing main trusses 1 from tilting outward.

[0040] The present invention is simple to construct and easy to install, and provides a set of independent assembled trusses. The traction mechanism provides sliding power for the load-bearing main trusses, and the two load-bearing main trusses are kept moving forward synchronously during use, thereby solving the technical problem of causing safety burden to the hanging basket, and the hanging basket can also move forward simultaneously with the spraying maintenance system.

[0041] In this embodiment, the present invention ensures the stability of the load-bearing main trusses during movement and reduces the risk of tipping outward by arranging multiple groups of tension devices between two groups of load-bearing main trusses.

[0042] In other embodiments, a plurality of groups of inclined-stayed devices are arranged on the side of each group of the load-bearing main trusses 1 away from the bridge edge, one end of each group of inclined-stayed devices is connected to the corresponding load-bearing main trusses, and the other end is connected to the embedded ring of the box girder surface, so as to prevent the load-bearing main trusses 1 from tilting outward due to the gravity of the water collection and recovery tray. When the box girder is maintained, the inclined-stayed device is fixed to the embedded ring of the box girder surface, and when the load-bearing main trusses are moved, the connection between the inclined-stayed device and the box girder surface is disassembled.

[0043] In this embodiment, in step S10, each set of guide rails includes:

[0044] A support rail, which is installed on the bridge deck and extends along the length of the box girder;

[0045] The reverse guide rail is arranged on the side of the supporting guide rail away from the side of the beam and is arranged parallel to the supporting guide rail.

[0046] In this embodiment, in step S20, the installation steps of the load-bearing main truss 1 are:

[0047] S21. According to the force calculation, the structure of the truss is designed. After the specifications are determined, a plurality of different plane trusses are welded in the factory. Each plane truss is composed of a vertical rod 3, a diagonal rod 4, a horizontal rod 2 and a stiffening plate 5;

[0048] S22, assembling a plurality of different plane trusses into a truss whole by bolts at the construction site;

[0049] S23, installing the driving wheel 7 on the supporting guide rail, and connecting it to the load-bearing main truss 1 through the load-bearing wheel vertical rod 6, installing the driven wheel 9 on the reverse guide rail, and connecting it to the load-bearing main truss 1 through the reverse wheel vertical rod 8.

[0050] In this embodiment, in step S20, the traction device is a motor drive assembly, a fall chain or an electric hoist.

[0051] During specific implementation, when the traction device is a motor drive assembly, the motor in the motor drive assembly is installed on the load-bearing vertical rod, the output end of the motor is connected to the first pulley, and one side of the driving wheel 7 is connected to the second pulley. The first pulley and the second pulley are driven by a belt, and the two motors are operated synchronously to ensure that the load-bearing main trusses on both sides move forward synchronously.

[0052] During specific implementation, when the traction device is a fall chain or an electric hoist, the front end of the fixed travel direction is pulled at both ends at the same time to ensure that the load-bearing main trusses on both sides move forward synchronously.

[0053] In this embodiment, in step S30, a U-shaped groove 11 is opened at the end of the square steel on one side of each load-bearing main truss 1 extending out of the box girder, and a sealing member is installed at the front end of the U-shaped groove 11. The first end of the suspension rod 10 is connected to the pallet, and the second end passes through the U-shaped groove 11 and is connected to the load-bearing main truss 1.

[0054] In this embodiment, the second end of the hanger 10 is provided with an external thread and is fixed to the load-bearing main truss 1 by a nut, and a pad or channel steel pad 12 is provided between the nut and the load-bearing main truss 1, and the extension direction of the channel steel pad 12 is arranged perpendicular to the U-shaped notch 11.

[0055] Preferably, the sealing member is a steel bar or a steel plate 15 , and is welded to the opening side of the U-shaped notch 11 .

[0056] In other embodiments, two through holes are correspondingly opened on the side walls of the U-shaped notch 11 , and the fixing bolts 13 pass through the through holes in sequence and are fixed by the second nuts.

[0057] In other embodiments, a mounting hole is provided at the end of the square steel on one side of each load-bearing main truss 1 extending out of the box beam, and the mounting hole is arranged corresponding to the second end of the suspension rod.

[0058] In this embodiment, the tensioning device 14 is a steel wire rope, a first end of the steel wire rope is fixed to one of the load-bearing main trusses 1 by a steel wire rope clamp, and a second end is fixedly connected to the other load-bearing main truss 1 by a basket bolt.

[0059] In this embodiment, the pulling device 16 is a steel wire rope, a steel wire rope clamp at the first end of the steel wire rope is fixed to the corresponding load-bearing main truss, and the other end of the second end is connected to the embedded ring on the box beam surface.

[0060] In this embodiment, at least two suspension points are arranged between each load-bearing main truss 1 and the pallet.

[0061] During the specific implementation, the main load-bearing trusses provide no less than 4 lifting points for the pallet from both sides of the box girder, which are arranged symmetrically on the left and right. The two main load-bearing trusses are pulled against each other with steel wire ropes to ensure the overall stability of the trusses. The traction devices of the other two main load-bearing trusses must move synchronously to ensure that the traction force and the direction of travel are always consistent.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A construction method for an assembled truss, characterized in that: The following steps are involved: S10, symmetrically laying two sets of guide rails on the bridge deck of the box girder, wherein the guide rails extend along the length direction of the box girder to provide guidance for the load-bearing main trusses; S20, installing two load-bearing main trusses on two sets of guide rails respectively, the two load-bearing main trusses are used to provide support for the spray curing device, and the two load-bearing main trusses are respectively provided with traction devices at the front ends in the travel direction to provide traction force. When traveling, the two traction devices are operated synchronously to ensure that the load-bearing main trusses on both sides move forward synchronously; S30, connecting the two ends of the water collection and recovery tray disposed on the lower side of the bottom of the box beam to the two load-bearing main trusses through suspension rods; S40. Install multiple sets of tension devices between the sides of the two load-bearing main trusses that are close to each other, or set multiple sets of inclined-stayed devices on the side of each set of load-bearing main trusses that is away from the bridge edge, one end of each set of inclined-stayed devices is connected to the corresponding load-bearing main trusses, and the other end is connected to the embedded ring on the box girder surface, so as to prevent the two sets of load-bearing main trusses from tilting toward the outside of the box girder.

2. The construction method of the assembled truss according to claim 1, characterized in that: In step S10, each set of guide rails includes: A support rail, which is installed on the bridge deck and extends along the length direction of the box girder; The inverted guide rail is arranged on a side of the supporting guide rail away from the side of the box beam and is arranged parallel to the supporting guide rail.

3. The construction method of the assembled truss according to claim 1, characterized in that: In step S20, the installation steps of the load-bearing main truss are: S21. According to the force calculation, the structure of the truss is designed. After the specifications are determined, welding of multiple different plane trusses is performed in the factory, each of which is composed of vertical bars, diagonal bars, horizontal bars and stiffening plates; S22, assembling a plurality of different plane trusses into a load-bearing main truss as a whole by bolts at the construction site; S23, installing the driving wheel on the supporting guide rail, and connecting it to the load-bearing main truss through the load-bearing wheel vertical rod, installing the driven wheel on the reverse guide rail, and connecting it to the load-bearing main truss through the reverse wheel vertical rod.

4. The construction method of the assembled truss according to claim 3, characterized in that: In step S20, the traction device is a motor drive assembly, a fall chain or an electric hoist.

5. The construction method of the assembled truss according to claim 1, characterized in that: In step S30, a U-shaped notch is opened at the end of the square steel on one side of each load-bearing main truss extending out of the box girder, a sealing member is installed at the open end of the U-shaped notch, the first end of the hanger is connected to the pallet, the second end of the hanger is provided with an external thread, and the second end of the hanger is fixed by a first nut after passing through the U-shaped notch.

6. The construction method of the assembled truss according to claim 5, characterized in that: A washer or a channel steel pad is arranged between the first nut and the load-bearing main truss, and the extending direction of the channel steel pad is arranged perpendicular to the U-shaped notch.

7. The construction method of the assembled truss according to claim 5, characterized in that: The sealing member is a steel bar or a steel plate and is welded to the opening side of the U-shaped notch.

8. The construction method of the assembled truss according to claim 5, characterized in that: The sealing member is a fixing bolt, and two through holes are correspondingly provided on the side walls on both sides of the U-shaped notch. The fixing bolt passes through the through holes in sequence and is fixed by a second nut.

9. The construction method of the assembled truss according to claim 5, characterized in that: The pulling device is a steel wire rope, a steel wire rope clamp at a first end of the steel wire rope is fixed to one of the load-bearing main trusses, and a second end is fixedly connected to the other load-bearing main truss via a basket bolt.

10. The construction method of the assembled truss according to claim 5, characterized in that: At least two hanging points are arranged between each of the load-bearing main trusses and the pallet.

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