CN115559535A - Main shaft dismounting construction process of rigid portal frame and fixed cable-assisted vertical frame system - Google Patents

Main shaft dismounting construction process of rigid portal frame and fixed cable-assisted vertical frame system Download PDF

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Publication number
CN115559535A
CN115559535A CN202211229987.5A CN202211229987A CN115559535A CN 115559535 A CN115559535 A CN 115559535A CN 202211229987 A CN202211229987 A CN 202211229987A CN 115559535 A CN115559535 A CN 115559535A
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CN
China
Prior art keywords
steel wire
wire rope
vertical frame
dismounting
frame system
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Pending
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CN202211229987.5A
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Chinese (zh)
Inventor
黄远飞
张斯涵
吕俊
陈伟仲
张晶亮
楼惠一
崔文斌
吴天佑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI AMUSEMENT MACHINE ENGINEERING CO LTD
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SHANGHAI AMUSEMENT MACHINE ENGINEERING CO LTD
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Priority to CN202211229987.5A priority Critical patent/CN115559535A/en
Publication of CN115559535A publication Critical patent/CN115559535A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14—Conveying or assembling building elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
    • B66C13/06—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C15/00—Safety gear
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/34—Extraordinary structures, e.g. with suspended or cantilever parts supported by masts or tower-like structures enclosing elevators or stairs; Features relating to the elastic stability
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14—Conveying or assembling building elements
    • E04G21/16—Tools or apparatus
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14—Conveying or assembling building elements
    • E04G21/16—Tools or apparatus
    • E04G21/162—Handles to carry construction blocks
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/08—Wrecking of buildings

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)

Abstract

The invention discloses a main shaft dismounting construction process of a vertical frame system of a rigid portal frame assisted by a fixed cable, which firstly fixes steel wire ropes of two vertical columns in the vertical frame system by a rope clamp to keep the stability of the vertical frame system on the premise of not dismounting the fixed cable; then under the tension of the fixed cable, the top end of the upright post in the upright frame system is opened towards two sides; finally, the central spindle is removed. According to the spindle dismounting construction process, the spindle in the vertical frame system can be quickly and safely dismounted under the condition of dismounting-free and mounting of the fixing cable aiming at the vertical frame system with a specific structure, namely the vertical frame system of the rigid portal frame assisted by the fixing cable, so that the dismounting construction efficiency can be greatly improved, and potential safety hazards can be eliminated.

Description

Main shaft dismounting construction process of rigid portal frame and fixed cable-assisted vertical frame system
Technical Field
The invention relates to a construction process of a vertical frame system, in particular to a spindle construction process in the vertical frame system of a rigid portal frame assisted by a fixed cable.
Background
The rigid portal frame is assisted with a vertical frame supporting system of a fixed cable, the vertical frame supporting system is a single-side single upright post and is fixedly connected with a central mandrel through a bolt, two fixed cables are respectively assisted and tensioned at two sides of the upright post, and the supporting structure is mainly used for large-scale building mechanical structures such as ferris wheels and the like.
Referring to fig. 1 and 2, a typical structure of a current portal frame supporting system with a fixed cable is shown, which mainly includes: the device comprises a stand column 1, a main shaft 2, an outer cylinder 3, a stay cable 4, a stay cable seat 5, a connecting bolt 6 and a slewing bearing 7. The rigid portal frame formed in the way can bear axial load and radial load transmitted to a support system by a slewing bearing by a vertical frame support system structure of a fixed cable, wherein the pretension force of the fixed cable plays a role in stabilizing and supporting.
The vertical frame supporting system with the structure is based on the specific structure that the rigid portal frame is assisted by the fixed cables, when the vertical frame supporting system is disassembled and assembled, the four fixed cables are firstly disassembled after the pull force of the pull cables is slowly unloaded by utilizing the tool.
Referring to fig. 3, a typical structure of the unloading and tensioning of the fixing cable is shown, which mainly includes: tension cylinder 21, reaction beam 22, fixing cable 23, cable seat 24, gasket 25, nut 26 and lock nut 27.
Referring to fig. 1-3, in the front door frame shown in fig. 1 and 2, a supporting system with a fixing cable is used, for example, if a slewing bearing is replaced or a main shaft is replaced, the most conventional disassembling steps are mainly as follows:
firstly, the tension of the fixing cable is unloaded by using a tool.
Referring to fig. 3, the working process of using the tool to unload the tension of the fixing cable mainly includes the following steps:
a) Mounting a counterforce beam 22;
b) Mounting the jack 21
c) Applying pressure;
d) Disassembling the locking nut 27, the nut 26 and the angle adjusting nut (namely the gasket) 25;
e) Slowly releasing the pressure;
f) And (5) disassembling the tensioning tool.
And secondly, detaching the fixed cable fork lug pin shaft. After the four fixed cables are unloaded one by one, the pin shafts connecting the four cables and the vertical frame need to be dismantled, and the ends of the fixed cables need to be hung at multiple points by using a crane in the dismantling process so as to prevent the fixed cables from sliding down rapidly under the action of self weight.
Referring to fig. 4, the head of the fixing cable is shown in a schematic view. As can be seen from the figure, the conventional head portion of the fixing cable mainly includes a spindle seat 31, a fixing cable pin 32 and a fixing cable 33. The disassembly and assembly work flow of the head part of the fixing cable with the structure mainly comprises the following steps:
a) Hoisting the end part of the fork lug of the fixed cable 33 by using a crane;
b) The pin shaft 32 is disassembled;
c) The fixing rope 33 is removed using a crane.
Thirdly, the main shaft is lifted away. After the removal of the fixing cable is completed, the main shaft is lifted off using a crane using a shackle for four-point fixing, as shown in fig. 5.
Fourthly, hoisting the main shaft to the ground.
Fifthly, disassembling the flange bolts of the main shaft and the end face of the main shaft seat, and disassembling and replacing the slewing bearing or the main shaft.
Sixthly, after the replacement is finished, the main shaft and the main shaft seat are assembled, and the main shaft seat are hoisted to the top of the upright post to finish the assembly.
And seventhly, hoisting four fixed cables after assembly is completed, and sequentially completing installation of the main shaft ends of the fixed cables.
Eighth, the anchor rod end of the stay cable is pulled to the stay cable seat by the winch
And ninthly, installing four sets of tensioning tools, simultaneously tensioning, and pulling to a specified tension.
Tenth, adjusting the verticality of the vertical frame.
Eleventh, dismantle the tensioning frock.
In the conventional dismounting process of the main shaft of the vertical frame system with the rigid portal frame and the fixed cable, a plurality of problems exist in the actual operation process of replacing the slewing bearing or the main shaft, and the problems are mainly reflected in the following aspects:
(1) The construction process has long construction period and low efficiency, and particularly for the fixed cable, a special tool needs to be used for synchronous unloading, auxiliary dismounting of a crane and hoisting, and after the replacement is finished, tensioning, hoisting and the like need to be repeatedly carried out;
(2) The equipment requirement is high, so the dead weight of the fixed cable and the length of the cable body of the supporting system are high, and a tail slipping crane is needed to assist tail slipping or a crane with the hoisting height exceeding the length of the cable body is needed to be used for hoisting the fixed cable in the dismounting process.
(3) The potential safety hazard is big, wherein in the dismantlement process, hangs heavily, hangs high than higher, and the fixed cable body has the swift current risk of falling, need use hoist multiple hoisting points to hang, and potential safety hazard is big.
(3) The construction site tooling is complex, and a cable tensioning tooling needs to be used and a winch needs to be used for pulling the fixed cable to the installation position.
Therefore, how to rapidly, safely and reliably complete the dismounting construction of the main shaft of the vertical frame system of the rigid portal frame assisted by the fixed cable is a problem to be continuously solved in the field.
Disclosure of Invention
The invention aims to provide a spindle dismounting construction process of a vertical frame system with a rigid portal frame assisted by a fixed cable, which abandons the construction process thought of directly dismounting the fixed cable in the vertical frame system in the prior art and can realize the fast and safe dismounting of the spindle in the vertical frame system on the premise of no dismounting and mounting of the fixed cable.
In order to achieve the purpose, the rigid portal frame provided by the invention is assisted with a spindle dismounting construction process of a vertical frame system of a fixed cable, and on the premise of not dismounting the fixed cable, firstly, a circumferential ring is fixed by a rope clamp to surround steel wire ropes of two vertical columns in the vertical frame system, so that the stability of the vertical frame system is kept; then under the tension of the fixed cable, the top end of the upright post in the upright frame system is opened towards two sides; finally, the central spindle is removed.
Further, when the steel wire rope is fixed, the steel wire rope fixing device comprises:
firstly, calculating and determining the length of a steel wire rope surrounding a stand column for one circle according to the distance between two stand columns in a stand system and the diameter of each stand column;
then, calculating the pulling force required by the steel wire rope required by the set distance of the top ends of the two stand columns through a simulation calculation module, and setting the number of winding turns of the steel wire rope according to the pulling force;
then, marking the steel wire rope, wherein the set length of the steel wire rope is n multiplied by the number of turns of the steel wire rope and n multiplied by the set opening distance of the top end, and n is the number of turns of the surrounding steel wire rope;
and finally, fastening the marked steel wire rope at the top end of the upright post by adopting a rope clamp.
Furthermore, in the dismounting construction process, the axial horizontal component force in the direction of the main shaft between the stand columns, which is brought by the fixed cables at the two ends of the stand columns, is borne directly by the steel wire ropes surrounding the two stand columns.
Furthermore, in the dismounting construction process, after the steel wire rope is fixed between the two stand columns in a surrounding manner by the rope clamps, the central main shaft of the middle cross beam of the portal frame is dismounted, after the central main shaft is dismounted, the top ends of the two stand columns are opened towards two sides under the action of the pre-tightening force of the original fixing rope in the stand system, and the steel wire rope surrounding the two stand columns is synchronously tensioned; and finally, under the constraint of a steel wire rope which surrounds the stand column, the whole stand system achieves a stable state again after the central main shaft is disassembled.
According to the spindle dismounting construction process, the spindle in the vertical frame system can be quickly and safely dismounted under the condition of dismounting-free and mounting of the fixing cable aiming at the vertical frame system with a specific structure, namely the vertical frame system of the rigid portal frame assisted by the fixing cable, so that the dismounting construction efficiency can be greatly improved, and potential safety hazards can be eliminated.
Compared with the existing scheme, the spindle dismounting construction process can reduce the hoisting weight, reduce the operation flow, reduce the use of tools such as a tensioning device and a winch and eliminate the safety risks of possible cable unloading, self-sliding and the like under the conditions of not increasing the existing construction equipment and not needing additional dismounting and reinstalling processes.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
FIG. 1 is a structural illustration of a portal frame with a fixed cable support system;
FIG. 2 is an explanatory view showing an installation structure of the main shaft of FIG. 1;
FIG. 3 is a schematic view of a conventional cable tensioning concept;
FIG. 4 is a schematic view of a conventional fixing cable head being disassembled;
FIG. 5 is a schematic view of a conventional lift-off spindle;
FIG. 6 is an exemplary view of a construction state in the present invention;
FIG. 7 is a schematic view of an example of the present invention in which a wire rope is looped around a post;
FIG. 8 is an illustration of the rope clamp holding of an embodiment of the present invention;
fig. 9 is an illustration of a spindle hoisting in an embodiment of the invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Referring to fig. 1 and 2, the rigid portal frame is a vertical frame support system with fixed cables, specifically, a single-side single upright post is fixedly connected with a central mandrel through bolts, and two fixed cables are respectively supported and tensioned at two sides of the upright post.
It should be noted here that the height of the single-sided single column in the rigid portal frame assisted fixed-cable stand support system is generally 40-50m, and the weight of the single-sided single column reaches 23t-40t; the total weight of the main shaft between the two single-side single upright posts reaches 20-30t, and the weight of the central main shaft reaches 14-20t; meanwhile, the hoisting span of the whole supporting system during hoisting reaches 80-90m.
The supporting system formed based on the structural form and the size requirement is based on the portal frame and assisted by four fixed cables, and when the spindle is disassembled and assembled aiming at the specific structure, because the two fixed cables are respectively assisted and tensioned on the two sides of the whole portal frame, the fixed cables are firstly disassembled and the tensioning formed by the fixed cables is cancelled in the conventional disassembling and assembling scheme so as to realize the disassembling and assembling of the spindle arranged at the top; after the fixing cable is disassembled, the main shaft can be hoisted. However, such a construction scheme has many problems in the actual operation process, and details are not described herein, particularly in the background technology section.
Therefore, the rigid portal frame provided by the invention is assisted by a main shaft dismounting construction scheme of a vertical frame system of a fixed cable, the construction process thought of directly dismounting the fixed cable in the vertical frame system is abandoned, and the main shaft in the vertical frame system is dismounted fast and safely on the premise of innovatively avoiding dismounting and mounting the fixed cable.
Specifically, the implementation process of the spindle dismounting construction scheme of the vertical frame system with the rigid portal frame assisted by the fixed cable provided by the invention is as follows:
firstly, on the premise of not detaching the fixing rope, the steel wire ropes of two upright posts in the upright frame system are directly surrounded by the rope clamp fixing circumference ring, so as to keep the stability of the upright frame system, as shown in fig. 6-7;
then, under the tension of the fixed cable, the top end of the upright post in the upright post system is opened towards two sides; in the step, the top ends of two upright posts are opened towards two sides by using axial tension formed by fixing cables at two sides, and the opening degree is controlled by using a steel wire rope;
finally, the central spindle is removed.
When the steel wire rope serving as the component is fixedly arranged, firstly, the theoretical length of the steel wire rope surrounding the stand column for one circle is calculated according to the actually measured stand column distance and the stand column diameter on site; then accurately calculating the tension required by the steel wire rope for the set distance of the top ends of the two upright posts according to simulation; then, setting the number of winding turns of the steel wire rope according to the magnitude of the pulling force; then, marking a steel wire rope on the ground, wherein the set length of the steel wire rope is = n multiplied by the number of turns of the steel wire rope and n multiplied by the set opening distance of the top end; and finally, fastening the steel wire rope at the top end of the upright post by adopting a rope clamp.
On the basis, when the steel wire ropes are matched with the two upright posts, the invention innovatively bears the axial horizontal component force in the direction of the main shaft between the upright posts, which is brought by the fixed cables at the two ends of the upright posts, between the steel wire ropes and the upright posts through the steel wire ropes surrounding the two upright posts, and keeps the stability of the portal frame and the fixed cable upright frame support system.
According to the construction scheme, when the opening degree of the top ends of the two stand columns to open towards the two sides is adjusted, after the steel wire rope is fixed between the two stand columns in a surrounding mode through the rope clamps, the central spindle of the central beam of the portal frame is disassembled, and after the central spindle is disassembled, under the action of axial horizontal component force of fixing ropes at the two ends of the stand columns along the central spindle, the two ends of the stand columns respectively open towards the two sides; after the two ends of the upright post are opened by a certain opening degree, the steel wire rope is tensioned, and the whole system reaches a stable state and is mechanically balanced and does not open any more under the constraint of the steel wire rope wound on the upright post.
Therefore, the spindle dismounting construction scheme provided by the invention can be used for realizing the fast and safe dismounting of the spindle in the vertical frame system under the condition of no dismounting and mounting of the fixing cable aiming at the vertical frame system with a specific structure, namely the vertical frame system of the rigid portal frame assisted with the fixing cable, so that the dismounting construction efficiency can be greatly improved, and the potential safety hazard can be eliminated.
For the spindle dismounting construction scheme provided by the invention, a specific implementation process for dismounting the spindle of the vertical frame system with the rigid portal frame assisted by the fixed cable based on the scheme is illustrated.
Step (1): the portal frame to be disassembled and assembled is assisted by a vertical frame system of a fixed cable, and the pulling force required by the opening degree of two vertical columns in the vertical frame system is calculated through computer simulation software.
Specifically, preferably, 2 times of depth of the spigot at the shaft end is slightly larger than the depth of the spigot at the shaft end in the step, so that the main shaft can be just hung out, and meanwhile, the safety of the stand column can be ensured.
Step (2): selecting the corresponding steel wire rope specification according to the tension obtained by calculation in the step (1), and marking the calculated perimeter by using a marker after the specification is determined.
The circumference here is a set length for the wire rope. Specifically, the length of the steel wire rope in the step is set to be n multiplied by the number of turns of the steel wire rope + n multiplied by the top end to set the opening distance, and n is the number of turns of the surrounding steel wire rope.
For example, when the girth is marked, a mark can be made by using a mark pen or a tether is used as a mark, so that the mark can be clear, and the subsequent winding setting between the steel wire rope and the stand column is convenient.
And (3): and (3) fixing two upright posts by using the circumference of the selected steel wire rope, and fixing the steel wire rope by using a rope clamp according to the standard specification according to the circumference mark calibrated in the step (2).
Referring to fig. 8, when the steel wire rope is wound around the upright column in this step, it is preferable to cooperate with a horizontal device to ensure that the steel wire rope is installed horizontally, so that the wound steel wire rope is in the same horizontal plane to ensure the stability of the cooperation between the steel wire rope and the upright column.
Moreover, the mode of fixing the steel wire rope through the rope clamp in the step can be determined according to actual requirements, and the mode is not limited, so long as construction is convenient and the steel wire rope is stable and reliable after being arranged.
And (4): the four hoisting points are used to secure the main shaft and to load the crane appropriately, as shown in fig. 9.
And (5): and (4) removing the flange bolts on the end surfaces of the main shaft and the main shaft seat.
And (6): after the steel wire rope is tensioned and loaded, the central spindle is slowly lifted away.
The step is based on the fact that the pre-tightening force of an original fixed cable in the supporting system is matched with the tensioning of a steel wire rope to achieve that the top ends of the two upright posts are opened towards two sides.
Specifically, under the condition that an original fixed cable in the supporting system is not dismounted, after an end face flange bolt is dismounted, the axial inward horizontal tension force which is offset with the pre-tightening force of the original fixed cable is lost between the top ends of the two upright posts, the top ends of the two upright posts are naturally opened towards two sides under the pre-tightening force effect of the original fixed cable of the supporting system, and a steel wire rope wound between the two upright posts is synchronously tensioned in the opening process, namely the steel wire rope is naturally tensioned under the pre-tightening force effect of the fixed cable; the process can rapidly reach the position of the opening control of the steel wire rope under the action of the pre-tightening force of the fixed rope, and the stability is ensured. Meanwhile, the specific opening position can be determined by adjusting the length of the steel wire rope.
And (7): the slewing bearing or the main shaft is replaced.
And (8): and hoisting the replaced main shaft to the mounting position, and fixing the flange on the end face of the main shaft seat and the end face of the main shaft by using bolts.
As a preferred scheme, when the step is specifically implemented, the length of the steel wire rope is adjusted, for example, the steel wire rope is wound by the winding mechanism to adjust the length wound between the two vertical columns, so that the two vertical columns overcome the pre-tightening force of the original fixed cable, the two ends of the two vertical columns are simultaneously drawn close to the middle of the two vertical columns, the vertical columns are restored, and then the end face flange of the spindle seat is fixed with the end face of the spindle through the bolt connected with the end face of the central spindle through the end face of the spindle seat, so that the efficiency and the safety of fixing construction can be improved.
As an alternative scheme, the bolts connected with the end face of the central spindle can be directly tightened through the end face of the spindle seat, so that the two stand columns overcome the pre-tightening force of the original fixed cable, the two ends of the stand columns are simultaneously drawn close to the middle, and the stand columns are restored.
And (9): and (5) dismantling the steel wire rope to finish the installation.
According to the embodiment, the spindle dismounting construction scheme provided by the invention can greatly reduce the field construction difficulty, reduce the procedures of dismounting and tensioning the fixing cable and reduce the safety risk of construction. Meanwhile, the working efficiency is greatly improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (4)

1. A main shaft dismounting construction process of a vertical frame system of a rigid portal frame assisted by a fixed cable is characterized in that on the premise of not dismounting the fixed cable, steel wire ropes of two vertical columns in the vertical frame system are firstly fixed by rope clamps, and the stability of the vertical frame system is kept; then under the tension of the fixed cable, the top end of the upright post in the upright frame system is opened towards two sides; finally, the central spindle is removed.
2. The spindle dismounting and mounting construction process according to claim 1, wherein when the steel wire rope is fixed, the process comprises the following steps:
firstly, calculating and determining the length of a steel wire rope surrounding a stand column for one circle according to the distance between two stand columns in a stand system and the diameter of each stand column;
then, calculating the pulling force required by the steel wire rope required by the set distance of the top ends of the two stand columns through a simulation calculation module, and setting the number of winding turns of the steel wire rope according to the pulling force;
then, marking the steel wire rope, wherein the set length of the steel wire rope is n multiplied by the number of turns of the steel wire rope and n multiplied by the set opening distance of the top end, and n is the number of turns of the surrounding steel wire rope;
and finally, fastening the marked steel wire rope at the top end of the upright post by adopting a rope clamp.
3. The spindle dismounting construction process according to claim 1, wherein in the dismounting construction process, axial horizontal component force in the direction of the spindle between the columns caused by the fixed cables at the two ends of the columns is borne directly by the steel wire ropes surrounding the two columns.
4. The main shaft dismounting construction process according to claim 1, wherein in the dismounting construction process, after the steel wire rope is fixed between the two upright posts by surrounding the steel wire rope with the rope clamp, the central main shaft of the middle cross beam of the portal frame is dismounted, after the central main shaft is dismounted, the top ends of the two upright posts are opened towards two sides under the pre-tightening force of the original fixing rope in the upright post system, and the steel wire rope surrounding the upright posts is synchronously tensioned; and finally, the whole vertical frame system reaches a steady state again under the constraint of the steel wire rope which is wound on the vertical column.
CN202211229987.5A 2022-10-09 2022-10-09 Main shaft dismounting construction process of rigid portal frame and fixed cable-assisted vertical frame system Pending CN115559535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211229987.5A CN115559535A (en) 2022-10-09 2022-10-09 Main shaft dismounting construction process of rigid portal frame and fixed cable-assisted vertical frame system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211229987.5A CN115559535A (en) 2022-10-09 2022-10-09 Main shaft dismounting construction process of rigid portal frame and fixed cable-assisted vertical frame system

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Publication Number Publication Date
CN115559535A true CN115559535A (en) 2023-01-03

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Application Number Title Priority Date Filing Date
CN202211229987.5A Pending CN115559535A (en) 2022-10-09 2022-10-09 Main shaft dismounting construction process of rigid portal frame and fixed cable-assisted vertical frame system

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