A main shaft disassembly and assembly construction process for a rigid portal frame and a fixed cable-assisted vertical frame system

Abstract

The present invention discloses a main shaft disassembly and assembly construction process for a frame system comprising a rigid portal frame supplemented by fixed cables. Without removing the fixed cables, the process first secures the steel wire ropes encircling the two columns of the frame system with rope clamps to maintain the stability of the frame system. Then, under the tension of the fixed cables, the tops of the columns in the frame system are opened to both sides. Finally, the central main shaft is removed. The main shaft disassembly and assembly construction process of the present invention is capable of quickly and safely disassembling and assembling the main shaft of a frame system comprising a rigid portal frame supplemented by fixed cables, without disassembling the system and only installing the fixed cables. This greatly improves disassembly and assembly efficiency and eliminates safety hazards.

Description

Technical Field

[0001] The invention relates to a construction process of a stand system, in particular to a main shaft construction process of a stand system of a rigid portal frame supplemented by a fixing cable. Background Art

[0002] The frame support system of the rigid portal frame supplemented by fixed cables is a single column on one side fixedly connected to the central core shaft by bolts, and two fixed cables are supplemented and tensioned on both sides of the column. This support structure is mostly used in large-scale building mechanical structures such as Ferris wheels.

[0003] See also Figure 1 and Figure 2 The figure shows the typical structure of a current portal frame support system supplemented by fixed cables, primarily comprising: columns 1, main shaft 2, outer cylinder 3, cables 4, cable holders 5, connecting bolts 6, and slewing bearing 7. This rigid portal frame support system supplemented by fixed cables can withstand axial and radial loads transmitted to the support system from the slewing bearing, with the pretension of the fixed cables providing stable support.

[0004] The vertical support system of this type of structure is based on its specific structure of using a rigid portal frame supplemented by fixed cables. When disassembling and assembling, it is necessary to first use tooling to slowly unload the tension of the four fixed cables before disassembling.

[0005] See also Figure 3 , which shows a typical structure for unloading and tensioning the fixed cable. As can be seen from the figure, it mainly includes: a tensioning cylinder 21, a reaction beam 22, a fixed cable 23, a cable seat 24, a gasket 25, a nut 26, and a locking nut 27.

[0006] Combine Figure 1-Figure 3 As shown, for Figure 1 and Figure 2 The front door frame shown is supported by a fixed cable support system. If the slewing bearing is replaced or the main shaft is disassembled and replaced, the most common disassembly steps are mainly divided into the following steps:

[0007] First, use the tooling to unload the tension on the fixed cables.

[0008] Combine Figure 3 As shown in the figure, the workflow for unloading the tension of the fixed cable using the tooling mainly includes the following steps:

[0009] a) Install the reaction beam 22;

[0010] b) Install the hydraulic jack 21

[0011] c) applying pressure;

[0012] d) Remove the lock nut 27, nut 26, and angle adjustment nut (i.e., washer) 25;

[0013] e) Release the pressure slowly;

[0014] f) Remove the tensioning fixture.

[0015] Second, remove the pins of the fork ears of the fixing cables. After unloading the four fixing cables one by one, the pins connecting the four cables to the vertical frame need to be removed. During the removal process, a crane needs to be used to lift the ends of the fixing cables at multiple points to prevent the fixing cables from sliding down quickly under their own weight.

[0016] See also Figure 4 , which shows a schematic diagram of the disassembly and assembly of the fixed cable head. As can be seen from the figure, a conventional fixed cable head mainly includes a main shaft seat 31, a fixed cable pin shaft 32 and a fixed cable 33. The disassembly and assembly workflow of the fixed cable head with such a structure mainly includes the following steps:

[0017] a) Use a crane to lift the end of the fork ear of the fixing rope 33;

[0018] b) Remove the pin 32;

[0019] c) Use a crane to remove the fixing cable 33.

[0020] Third, lift the main shaft away. After the removal of the fixed rope, use the shackle to fix it at four points and use the crane to lift the main shaft away. Figure 5 shown.

[0021] Fourth, hoist the spindle to the ground.

[0022] Fifth, remove the bolts between the main shaft and the main shaft seat end flange, and disassemble and replace the slewing bearing or main shaft.

[0023] Sixth, after the replacement is completed, assemble the main shaft and the main shaft seat, hoist them to the top of the column, and complete the assembly.

[0024] Seventh, after completing the assembly, hoist the four fixing cables and complete the installation of the main shaft ends of the fixing cables in sequence.

[0025] Eighth, use the winch to pull the anchor end of the cable to the cable seat

[0026] Ninth, install four sets of tensioning tooling and tension them simultaneously to the specified tension.

[0027] Tenth, adjust the verticality of the stand.

[0028] Eleventh, disassemble the tensioning tooling.

[0029] The conventional disassembly and assembly process of the main shaft of the vertical frame system with a rigid portal frame supplemented by a fixed cable has many problems in the actual operation process of replacing the slewing bearing or the main shaft, which are mainly reflected in the following aspects:

[0030] (1) The construction process is long and inefficient, especially for fixed cables, which require the use of specific tooling for simultaneous unloading, crane-assisted disassembly and lifting. After the replacement is completed, the tensioning and lifting process needs to be repeated;

[0031] (2) The equipment requirements are high, so the fixed rope of the support system is heavy and the rope body is long. During the disassembly process, a tail crane is needed to assist in tail sliding or a crane with a lifting height exceeding the length of the rope body is needed to lift it away from the fixed rope.

[0032] (3) There are great safety hazards. During the disassembly process, the lifting weight is heavy and the lifting height is relatively high. There is a risk of the fixed rope body sliding down. It is necessary to use a crane to lift it at multiple lifting points, which poses a great potential safety hazard.

[0033] (3) The construction site tooling is complex, requiring the use of cable tensioning tooling and a winch to pull the fixed cable to the installation position.

[0034] Therefore, how to quickly, safely and reliably complete the disassembly and assembly of the main shaft of the upright system of the rigid portal frame supplemented by the fixing cable is a problem that continues to be solved in this field. Summary of the Invention

[0035] In view of the problems of low construction efficiency, high equipment requirements, high safety risks and complex construction site tooling in the conventional disassembly and assembly construction scheme of the main shaft in the existing frame support system, the purpose of the present invention is to provide a main shaft disassembly and assembly construction process for a frame system with a rigid portal frame supplemented by a fixed cable. This construction process abandons the conventional construction process idea of ​​directly disassembling and assembling the fixed cable in the frame system, and can achieve rapid and safe disassembly and assembly of the main shaft in the frame system without disassembling and installing the fixed cable.

[0036] In order to achieve the above-mentioned purpose, the present invention provides a main shaft disassembly and assembly construction process for the upright system of a rigid portal frame supplemented by a fixing cable. Without disassembling the fixing cable, the steel wire ropes surrounding the two upright columns of the upright system are first fixed by rope clamps to maintain the stability of the upright system; then, under the tension of the fixing cable, the top ends of the upright columns in the upright system are opened to both sides; finally, the central main shaft is removed.

[0037] Furthermore, when the steel wire rope is fixed, it includes:

[0038] First, calculate and determine the length of the wire rope around the column based on the distance between the two columns in the frame system and the diameter of each column;

[0039] Then, the simulation calculation module calculates the required tension of the wire rope required to open the top of the two columns to a set distance, and sets the number of wire rope turns according to the tension;

[0040] Next, mark the wire rope. The set length of the wire rope is n×the circumference of a single wire rope loop+n×the set opening distance at the top, where n is the number of wire rope loops.

[0041] Finally, fasten the marked wire rope at the top of the column using a rope clamp.

[0042] Furthermore, in the disassembly and assembly construction process, the axial horizontal force in the main axis direction between the columns brought by the fixing cables at both ends of the columns is directly borne by the steel wire rope wrapped around the two columns.

[0043] Furthermore, in the disassembly and assembly construction process, after the steel wire rope is fixed in the middle of the two columns by using a rope clamp, the central main shaft of the middle crossbeam of the portal frame is disassembled. After the central main shaft is disassembled, the two columns are opened to both sides at the top under the action of the pre-tightening force of the original fixed rope in the frame system, and the steel wire rope wrapped around them is simultaneously tensioned; finally, under the constraint of the steel wire rope wrapped around the columns, the entire frame system reaches a steady state again after the central main shaft is disassembled.

[0044] The main shaft disassembly and assembly construction process of the present invention can be used for a specific structural frame system of a rigid portal frame supplemented by a fixing cable. It can achieve fast and safe disassembly and assembly of the main shaft in the frame system without disassembly and installation of the fixing cable, thereby greatly improving the disassembly and assembly construction efficiency and eliminating safety hazards.

[0045] Compared with the existing solutions, the main shaft disassembly and assembly construction process of the present invention can reduce the lifting weight, shorten the operation process, and reduce the use of tensioning devices, winches and other tooling without adding existing construction equipment and requiring additional disassembly and reassembly procedures, thereby eliminating possible safety risks such as cable unloading and self-slip. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0047] Figure 1 This is a structural example diagram of a support system for a portal frame supplemented by fixed cables;

[0048] Figure 2 for Figure 1 Example diagram of the installation structure of the spindle;

[0049] Figure 3 This is a schematic diagram of the tensioning principle of the existing fixed cable;

[0050] Figure 4 This is a schematic diagram of disassembly and assembly of the existing fixed cable head;

[0051] Figure 5 This is a schematic diagram of the existing lifting spindle;

[0052] Figure 6 This is an example diagram of the construction status of the present invention;

[0053] Figure 7 This is an example diagram of a steel wire rope wrapped around a column in the present invention;

[0054] Figure 8 This is an example diagram of fixing a rope clip in an example of the present invention;

[0055] Figure 9 This is an example diagram of the main shaft hoisting in an example of the present invention. DETAILED DESCRIPTION

[0056] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0057] See also Figure 1 and Figure 2 The rigid portal frame support system supplemented by fixed cables is specifically a single column on one side fixedly connected to the central core shaft by bolts, and two fixed cables are supplemented and tensioned on both sides of the column.

[0058] It should be noted here that the height of a single column in the vertical support system of a rigid portal frame supplemented by a fixed cable is generally 40-50m, and the weight of a single column reaches 23t-40t; the total weight of the main shaft between the two single columns reaches 20-30t, and the weight of the central main shaft reaches 14-20t; at the same time, the lifting span of the entire support system during lifting reaches 80-90m.

[0059] The support system, based on this structural form and dimensional requirements, is based on a portal frame supplemented by four retaining cables. For this specific structure, when disassembling and assembling the main shaft, two retaining cables are tensioned on each side of the portal frame. Therefore, to disassemble and assemble the top-mounted main shaft, conventional disassembly and assembly methods require first removing the retaining cables to eliminate the tension created by the cables. After removing the cables, the main shaft can be hoisted. However, this construction method presents numerous practical problems, as detailed in the Background Technology section and not detailed here.

[0060] In this regard, the present invention provides a main shaft disassembly and assembly construction plan for a vertical frame system with a rigid portal frame supplemented by fixed cables, which abandons the conventional construction process of directly disassembling and assembling the fixed cables in the vertical frame system, and innovatively realizes the rapid and safe disassembly and assembly of the main shaft in the vertical frame system without disassembling and installing the fixed cables.

[0061] Specifically, the implementation process of the main shaft disassembly and assembly construction scheme of the rigid portal frame supplemented by the fixing cable stand system provided by the present invention is as follows:

[0062] First, without removing the fixing rope, directly fix the wire rope around the two columns of the frame system with the rope clamp to maintain the stability of the frame system. Figure 6-Figure 7 As shown;

[0063] Next, under the tension of the fixing cables, the tops of the columns in the frame system are opened to both sides. In this step, the axial tension generated by the fixing cables on both sides is used to open the tops of the two columns to both sides, and the opening is controlled by steel cables.

[0064] Finally, remove the center spindle.

[0065] When fixing the wire rope as a component, first calculate the theoretical length of the wire rope wrapped around the column based on the actual measured column spacing and column diameter on site; then accurately calculate the required tension of the wire rope required to open the top of the two columns to a set distance based on simulation; then set the number of wire rope wraps according to the tension; then mark the wire rope on the ground, the set length of the wire rope = n × number of wire rope wraps + n × set opening distance at the top; finally, use a rope clamp to tighten the wire rope at the top of the column.

[0066] On this basis, when the steel wire rope is coordinated with the two columns, the present invention innovates that the steel wire rope is wrapped around the two columns to bear the axial horizontal force in the main axis direction between the columns brought by the fixed cables at both ends of the columns, thereby maintaining the stability of the portal frame supplemented by the fixed cable frame support system.

[0067] When adjusting the opening degree of the top ends of the two columns to both sides, this construction plan uses a wire rope to fix the wire rope in the middle of the two columns with a rope clamp, and then removes the central main shaft of the middle crossbeam of the portal frame. After the central main shaft is removed, the two ends of the column are opened to both sides respectively under the action of the axial horizontal component of the central main shaft of the fixed cables at both ends of the column; after the two ends of the column are opened to a certain degree, the wire rope will be tensioned, and under the constraint of the wire rope wrapped around the column, the whole system reaches a steady state and mechanical balance and will no longer open.

[0068] Based on this, the main shaft disassembly and assembly construction plan provided by the present invention can be used for the specific structure of the frame system of the rigid portal frame supplemented by the fixing cable. It can realize the rapid and safe disassembly and assembly of the main shaft in the frame system without disassembly and installation of the fixing cable, which can greatly improve the disassembly and assembly construction efficiency and eliminate safety hazards.

[0069] With respect to the main shaft disassembly and assembly construction scheme provided by the present invention, an example is given to illustrate the specific implementation process of disassembling and assembling the main shaft of the upright system of the rigid portal frame supplemented by the fixing cable based on the scheme.

[0070] Step (1): For the portal frame to be disassembled and assembled, the vertical frame system supplemented by the fixing rope is used to calculate the tension required for the opening of the two columns in the vertical frame system by computer simulation software.

[0071] Specifically, in this step, it is preferred to take a depth slightly larger than 2 times the depth of the stop at the shaft end, thereby ensuring that the main shaft can be lifted out while also ensuring the safety of the column.

[0072] Step (2): Select the corresponding wire rope specifications based on the tension calculated in step (1). After determining the specifications, use a marker to mark the calculated circumference.

[0073] The circumference here is the set length of the wire rope. Specifically, the set length of the wire rope in this step = n × the circumference of a single wire rope loop + n × the set opening distance at the top, where n is the number of wire rope loops.

[0074] For example, when marking the circumference, a marker pen or a tether can be used as a mark, so that the mark can be clear and it is convenient for the subsequent winding setting between the wire rope and the column.

[0075] Step (3): Use the selected wire rope circumference to fix the two columns. According to the circumference mark calibrated in step (2), use rope clamps to fix the wire rope according to standard specifications.

[0076] See also Figure 8 In this step, when the wire rope is wrapped around the column, it is preferably used in conjunction with a horizontal device to ensure the installation level, so that the wrapped wire rope should be in the same horizontal plane to ensure the stability of the fit between the wire rope and the column.

[0077] Furthermore, the specific method of fixing the wire rope by the rope clamp in this step can be determined according to actual needs and is not limited here. It only needs to ensure that it is easy to construct and stable and reliable after installation.

[0078] Step (4): Use four lifting points to fix the main shaft and make the crane load appropriately, such as Figure 9 shown.

[0079] Step (5): Remove the bolts between the spindle and the spindle seat end flange.

[0080] Step (6): After ensuring that the wire rope is taut and loaded, slowly lift the center spindle away.

[0081] This step is based on the pre-tightening force of the original fixed cable in the support system and the tensioning of the wire rope to achieve the opening of the top ends of the two columns to both sides.

[0082] Specifically, without removing the existing retaining cables in the support system, after removing the end flange bolts, the axial inward horizontal tension between the tops of the two columns, which counteracted the preload of the existing retaining cables, is lost. Under the action of the preload of the existing retaining cables in the support system, the tops of the two columns naturally open to the sides, and during this opening process, the wire rope wrapped between the two columns is simultaneously tensioned. In other words, the wire rope is naturally tensioned under the action of the retaining cable preload. During this process, the preload of the retaining cables rapidly reaches the position where the wire rope controls the opening, ensuring stability. The specific opening position can also be determined by adjusting the length of the wire rope.

[0083] Step (7): Replace the slewing bearing or spindle.

[0084] Step (8): Hoist the replaced spindle to the installation location and use bolts to fix the spindle seat end flange to the spindle end face.

[0085] As a preferred solution, when this step is implemented, the length of the wire rope is adjusted, such as by winding the wire rope through a winding mechanism to adjust the length wrapped between the two columns, so that the two columns can overcome the original pre-tightening force of the fixing rope, and the two ends are simultaneously moved closer to the middle to restore the columns to their positions. At that time, the main shaft seat end face flange and the main shaft end face are fixed by bolts connecting the main shaft seat end face and the center main shaft end face, which can improve the efficiency and safety of the fixed construction.

[0086] As an alternative, the bolts connecting the spindle seat end face and the center spindle end face can be directly tightened so that the two columns overcome the original fixing cable preload and both ends move toward the middle at the same time to restore the columns to their original positions.

[0087] Step (9): Remove the wire rope and complete the installation.

[0088] From the above examples, it can be seen that the main shaft disassembly and assembly construction solution provided by the present invention can greatly reduce the difficulty of on-site construction, reduce the process of disassembling and tensioning the fixing rope, reduce the safety risks of construction, and at the same time greatly improve the operation efficiency.

[0089] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. The main shaft disassembly and assembly construction process of the rigid portal frame and the vertical frame system supplemented by the fixed cable is characterized by: Without disassembling the fixing rope, the steel wire rope around the two columns of the frame system is first fixed by a rope clamp to maintain the stability of the frame system; when the steel wire rope is fixed, first, the length of the steel wire rope around the column is calculated based on the distance between the two columns in the frame system and the diameter of each column; then, the required tension of the steel wire rope required to open the top of the two columns by a set distance is calculated by a simulation calculation module, and the number of wire rope loops is set according to the tension; then, the steel wire rope is marked, and the set length of the steel wire rope is n×the circumference of a single loop of the steel wire rope+n×the set opening distance at the top, where n is the number of wire rope loops; finally, the marked steel wire rope is fastened to the top of the column using a rope clamp; Then, under the tension of the fixed rope, the top of the column in the frame system is opened to both sides; Finally, remove the center spindle.

2. The main shaft disassembly and assembly construction process according to claim 1, characterized in that: In the disassembly and assembly construction process, the axial horizontal force in the main axis direction between the columns brought by the fixing cables at both ends of the columns is directly borne by the steel wire rope wrapped around the two columns.

3. The main shaft disassembly and assembly construction process according to claim 1, characterized in that: In the disassembly and assembly construction process, after the steel wire rope is fixed in the middle of the two columns by using a rope clamp, the central main shaft of the middle crossbeam of the portal frame is disassembled. After the central main shaft is disassembled, the two columns are opened to both sides at the top under the action of the pre-tightening force of the original fixed rope in the frame system, and the steel wire rope wrapped around them is simultaneously tensioned; finally, under the constraint of the steel wire rope wrapped around the columns, the entire frame system reaches a steady state again.

Images