A method for directional collapse demolition of a steel vertical cylindrical equipment

Abstract

The application discloses a kind of steel vertical cylinder equipment directional dumping dismantling method, first cutting out directional window, first and second foot line, after determining the real-time perpendicularity of steel vertical cylinder equipment is no dynamic change, third support line is cut again, make steel vertical cylinder equipment under the action of its own gravity towards target dumping direction safely dump;Since directional window, first, second and third support line meet condition one to condition five, so that before cutting third support line, steel vertical cylinder equipment can be kept stable under the support of first, second and third support line without perpendicularity change or only very small perpendicularity change, ensure that the actual dumping direction of steel vertical cylinder equipment and the deviation of target dumping direction is very small, avoid the problem that the existing directional window dumping dismantling method changes due to cutting process before dumping, resulting in the final actual dumping direction and target dumping direction exist larger deviation.

Description

TECHNICAL FIELD

[0001] The present application relates to a directional dumping demolition method, in particular to a directional dumping demolition method for a steel vertical cylindrical equipment. BACKGROUND

[0002] At present, the demolition of steel vertical equipment in the demolition market is rapidly developing from the conventional segmented cutting and hoisting demolition method to the directional dumping method. Whether the vertical equipment can be accurately dumped in the expected direction is the key to the directional dumping technology. In the prior art, the steel vertical equipment is demolished by the conventional segmented cutting and hoisting demolition method, which has the problems of high safety risk, slow speed and high cost. However, the directional window dumping technology has the problems of large dumping direction deviation and high safety risk. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a directional dumping demolition method for a steel vertical cylindrical equipment, which solves the problems of large dumping direction deviation and high safety risk in the prior art.

[0004] To solve the above technical problems, the technical solution adopted by the present application is as follows:

[0005] A directional dumping demolition method for a steel vertical cylindrical equipment, characterized in that: it is suitable for the demolition construction of a steel vertical cylindrical equipment such as a tower, a vertical container (for example, a blast furnace, a large storage tank) and the like;

[0006] Comprising:

[0007] Step S1, selecting a target dumping direction of the steel vertical cylindrical equipment, and marking the positions of a directional window, a first support line, a second support line and a third support line on the cylinder wall of the steel vertical cylindrical equipment, and satisfying the following conditions:

[0008] Condition one, the target dumping direction is the direction in which the central axis of the steel vertical cylindrical equipment points to the center line of the directional window, and the coplanar surface of the central axis and the center line is recorded as a vertical coplanar surface;

[0009] Condition two, the bottom edge of the directional window, the first support line, the first foot line, the third support line, the second foot line and the second support line are located on the same horizontal plane and sequentially connected end to end on the cylinder wall of the steel vertical cylindrical equipment to form a closed line;

[0010] Condition three, the length of the bottom edge of the directional window is greater than half the length of the closed line; that is, the first support line, the second support line and the third support line are located on the same half of the cross section of the steel vertical cylindrical equipment;

[0011] Condition four, the lengths of the first support line and the second support line are equal and symmetric about the vertical coplanar surface;

[0012] Condition five, the midpoint of the third support line is located in the vertical coplanar;

[0013] Step S2, cutting the directional window on the cylinder wall of the steel vertical cylinder equipment;

[0014] Step S3, cutting the first foot line and the second foot line at the same time;

[0015] In the above process: the cutting instrument and the position of the personnel are located at the side and rear of the target dumping direction of the steel vertical cylinder equipment throughout the process to ensure safety.

[0016] Step S4, measuring the real-time verticality of the steel vertical cylinder equipment with an instrument, and after determining that the real-time verticality has no dynamic change, executing step S5;

[0017] In the above process: the first support line, the second support line and the third support line are strictly reserved and cannot be cut; and the length of the first support line, the second support line and the third support line and the orientation of the first support line and the second support line are determined according to the specifications, wall thickness, weight and on-site wind load of the steel vertical cylinder equipment, so as to ensure that the steel vertical cylinder equipment is stable and does not dump after completing step S3.

[0018] Step S5, cutting the third support line to make the steel vertical cylinder equipment safely dump in the target dumping direction under the action of its own gravity. The cutting speed of step S5 should be slow to avoid safety risks caused by sudden breaking of the third support line.

[0019] Wherein, the dumping speed of the steel vertical cylinder equipment is affected by the size of the directional window. The size of the directional window cannot be too large, otherwise the dumping speed will be too fast, which will affect the safety of the on-site personnel. The size of the directional window also cannot be too small, otherwise the steel vertical cylinder equipment may not be able to completely dump. Therefore, the size and shape of the directional window should be determined comprehensively according to the specifications, wall thickness, center of gravity position and dumping speed of the steel vertical cylinder equipment.

[0020] In addition, the invention can choose automatic cutting equipment or manual cutting method for cutting. When manual cutting is adopted, it is appropriate to use an elongated rod cutting gun to cut the line at a high place.

[0021] Therefore, the present application cuts the directional window, the first foot line and the second foot line first, and then cuts the third support line after the real-time perpendicularity of the steel vertical cylindrical equipment is determined to be stable, so that the steel vertical cylindrical equipment is safely tilted towards the target tilting direction under the action of its own gravity; since the directional window, the first support line, the second support line and the third support line meet the conditions one to five, the steel vertical cylindrical equipment can remain stable under the support of the first support line, the second support line and the third support line before the third support line is cut, and the perpendicularity of the steel vertical cylindrical equipment does not change or only changes a little, so that the deviation between the actual tilting direction and the target tilting direction of the steel vertical cylindrical equipment is small, and the problem that the actual tilting direction deviates from the target tilting direction greatly due to the change of the perpendicularity caused by the cutting process before tilting in the prior art directional window tilting and dismantling method is avoided; therefore, the present application has the advantages of small tilting deviation and low safety risk.

[0022] As a preferred embodiment of the present application: the directional window is an isosceles trapezoidal window with a short top edge and a long bottom edge; wherein the top edge of the directional window is a line connecting point c and point d, and point a is the midpoint of the top edge; the bottom edge of the directional window is a line connecting point e and point f, and point b is the midpoint of the bottom edge;

[0023] The specific process of the step S2 includes:

[0024] Step S2-1, cut the center line of the directional window in the direction from point a to point b;

[0025] Step S2-2, simultaneously cut in the direction from point a to point c and in the direction from point a to point d to cut the top edge of the directional window;

[0026] Step S2-3, simultaneously cut in the direction from point c to point e and in the direction from point d to point f to cut the two waist edges of the directional window;

[0027] Step S2-4, simultaneously cut in the direction from point b to point e and in the direction from point b to point f to cut the bottom edge of the directional window.

[0028] Among them, steps S2-2 to S2-4 and step S3 are simultaneously operated by two people or two instruments, and steps S2-1 and S5 can be implemented by one person or one instrument.

[0029] Therefore, steps S2-2 to S2-4 in the present application cut the directional window in a symmetrical and synchronous manner, so that the stress balance of the steel vertical cylindrical equipment during cutting is achieved, and the perpendicularity of the steel vertical cylindrical equipment does not change or only changes a little during the cutting process, further ensuring that the deviation between the actual tilting direction and the target tilting direction of the steel vertical cylindrical equipment is small.

[0030] In addition, the directional window can be arcuate.

[0031] Preferably, the first support line is a line between the point e and the point g, the first foot line is a line between the point g and the point h, the third support line is a line between the point h and the point j, the second foot line is a line between the point j and the point i, and the second support line is a line between the point i and the point f.

[0032] In the step S3, the synchronous cutting is performed in the direction from the point g to the point h and in the direction from the point i to the point j, or the synchronous cutting is performed in the direction from the point h to the point g and in the direction from the point j to the point i, so as to simultaneously cut the first foot line and the second foot line.

[0033] Therefore, the step S3 in the present application performs the cutting of the first foot line and the second foot line in a symmetric synchronous manner, so that the force balance of the steel vertical cylinder equipment during the cutting is balanced, the perpendicularity will not change or only slightly change due to the cutting process, and further, the deviation between the actual dumping direction and the target dumping direction of the steel vertical cylinder equipment is small.

[0034] Preferably, before the step S2 is performed, the initial perpendicularity of the steel vertical cylinder equipment is measured by an instrument; and after the step S2 is performed, the current perpendicularity of the steel vertical cylinder equipment is measured by the instrument, and the current perpendicularity is compared with the initial perpendicularity, if the comparison result indicates that the steel vertical cylinder equipment has a tendency to tilt towards the target dumping direction, the step S3 is performed; otherwise, it indicates that the dumping tendency of the steel vertical cylinder equipment has a large deviation from the target dumping direction, and there is a large safety risk, and the work should be stopped, and the demolition scheme should be adjusted according to the situation.

[0035] Therefore, the present application compares the change of the current perpendicularity and the initial perpendicularity, and only when it is judged that the steel vertical cylinder equipment has a tendency to tilt towards the target dumping direction according to the comparison result, the step S3 is performed, so as to effectively avoid the safety risk caused by the large deviation between the dumping tendency of the steel vertical cylinder equipment and the target dumping direction, and improve the safety of the present application.

[0036] Preferably, when the third support line is cut in the step S5, the real-time perpendicularity of the steel vertical cylinder equipment is continuously monitored, and when the real-time perpendicularity is dynamically changed, it is judged that the steel vertical cylinder equipment starts to dump, and the cutting personnel and the instrument are notified to quickly retreat to the opposite direction of the dumping of the steel vertical cylinder equipment.

[0037] Before the step S1 is performed, it is confirmed that the site of the steel vertical cylinder equipment meets the safety operation requirements, and then the step S1 is performed.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] Firstly, the present application cuts the directional window 1-2, the first foot line D and the second foot line E first, and then cuts the third support line C after determining that the real-time perpendicularity of the steel vertical cylindrical equipment 1 does not change dynamically, so that the steel vertical cylindrical equipment 1 safely tilts in the target tilting direction F under the action of its own gravity; since the directional window 1-2, the first support line A, the second support line B and the third support line C meet conditions one to five, the steel vertical cylindrical equipment 1 can remain stable without perpendicularity change or only with very small perpendicularity change under the support of the first support line A, the second support line B and the third support line C before the third support line C is cut, so that the deviation between the actual tilting direction of the steel vertical cylindrical equipment 1 and the target tilting direction F is very small, and the problem that the actual tilting direction deviates greatly from the target tilting direction due to the change of perpendicularity caused by the cutting process before tilting in the prior art directional window tilting and dismantling method is avoided; therefore, the present application has the advantages of small tilting deviation and low safety risk.

[0040] Secondly, the steps S2-2 to S2-4 in the present application cut the directional window 1-2 in a symmetrical and synchronous manner, so that the stress balance of the steel vertical cylindrical equipment 1 during cutting is achieved, and the perpendicularity of the steel vertical cylindrical equipment 1 does not change or only changes very little due to the cutting process, further ensuring that the deviation between the actual tilting direction of the steel vertical cylindrical equipment 1 and the target tilting direction F is small.

[0041] Thirdly, the step S3 in the present application cuts the first foot line D and the second foot line E in a symmetrical and synchronous manner, so that the stress balance of the steel vertical cylindrical equipment 1 during cutting is achieved, and the perpendicularity of the steel vertical cylindrical equipment 1 does not change or only changes very little due to the cutting process, further ensuring that the deviation between the actual tilting direction of the steel vertical cylindrical equipment 1 and the target tilting direction F is small.

[0042] Fourthly, the present application compares the change of the current perpendicularity with the initial perpendicularity, and only when it is judged according to the comparison result that the steel vertical cylindrical equipment 1 has a tendency to tilt in the target tilting direction F, the step S3 is executed, so that the safety risk caused by the large deviation between the tilting tendency of the steel vertical cylindrical equipment 1 and the target tilting direction F is effectively avoided, and the safety of the present application is improved. BRIEF DESCRIPTION OF DRAWINGS

[0043] The present application will be further described in detail below in combination with the drawings and specific embodiments:

[0044] Fig. 1 The present application is calibrated on the steel vertical cylindrical equipment, and the elevation diagram is shown in the figure;

[0045] Fig. 2The development drawing marked on the cylinder wall of the steel vertical cylinder equipment for the present application;

[0046] Fig. 3 The plane schematic diagram for the present application marked on the steel vertical cylinder equipment. DETAILED DESCRIPTION

[0047] The present application will be described in detail below with reference to the embodiments and the accompanying drawings to help the skilled in the art better understand the inventive concept of the present application, but the protection scope of the claims of the present application is not limited to the following embodiments, and all other embodiments obtained by the skilled in the art without creative labor on the premise of not departing from the inventive concept of the present application belong to the protection scope of the present application.

[0048] Embodiment one

[0049] As shown in the figure, the present application discloses a steel vertical cylinder equipment directional dumping demolition method, which is suitable for the demolition construction of steel vertical cylinder equipment 1 such as towers, vertical vessels (for example, blast furnaces, large storage tanks) and the like; Figs. 1 to 3

[0050] including:

[0051] Step S1, selecting the target dumping direction F of the steel vertical cylinder equipment 1, and marking the positions of the directional window 1-2, the first support line A, the second support line B and the third support line C on the cylinder wall 1-1 of the steel vertical cylinder equipment 1, and satisfying the following conditions:

[0052] Condition one, the target dumping direction F is the direction in which the central axis 1-3 of the steel vertical cylinder equipment 1 points to the center line 1-2a of the directional window 1-2, and the coplanar surface of the central axis 1-3 and the center line 1-2a is recorded as the vertical coplanar surface 1-4;

[0053] Condition two, the bottom edge 1-2b of the directional window 1-2, the first support line A, the first foot line D, the third support line C, the second foot line E and the second support line B are located on the same horizontal plane and sequentially connected end to end on the cylinder wall 1-1 of the steel vertical cylinder equipment 1 to form a closed line;

[0054] Condition three, the length of the bottom edge 1-2b of the directional window 1-2 is greater than half the length of the closed line; that is, the first support line A, the second support line B and the third support line C are located on the same half of the cross section of the steel vertical cylinder equipment 1;

[0055] Condition four, the lengths of the first support line A and the second support line B are equal and symmetric about the vertical coplanar surface 1-4;

[0056] Condition five, the midpoint C1 of the third support line C is located in the vertical coplanar surface 1-4; ​

[0057] Step S2, cutting the directional window 1-2 on the cylinder wall 1-1 of the steel vertical cylinder device 1;

[0058] Step S3, cutting the first foot line D and the second foot line E at the same time;

[0059] In the above process: the cutting instrument and the position of the personnel are located at the side and behind the target dumping direction F of the steel vertical cylinder device 1 throughout the process to ensure safety.

[0060] Step S4, measuring the real-time verticality of the steel vertical cylinder device 1 with an instrument, and after determining that the real-time verticality has no dynamic change, executing step S5;

[0061] In the above process: the first support line A, the second support line B, and the third support line C are strictly reserved and cannot be cut; and the length of the first support line A, the second support line B, and the third support line C and the orientation of the first support line A and the second support line B are determined according to the specifications, wall thickness, weight, and on-site wind load of the steel vertical cylinder device 1, so as to ensure that the steel vertical cylinder device 1 is stable and does not dump after completing step S3.

[0062] Step S5, cutting the third support line C to make the steel vertical cylinder device 1 safely dump in the target dumping direction F under the action of its own gravity. The cutting speed of step S5 should be slow to avoid safety risks caused by sudden breaking of the third support line C.

[0063] Wherein, the dumping speed of the steel vertical cylinder device 1 is affected by the size of the directional window 1-2. The size of the directional window 1-2 cannot be too large, otherwise the dumping speed will be too fast, which will affect the safety of the on-site personnel. The size of the directional window 1-2 also cannot be too small, otherwise the steel vertical cylinder device 1 may not be able to completely dump. Therefore, the size and shape of the directional window 1-2 should be determined comprehensively according to the specifications, wall thickness, center of gravity position, and dumping speed of the steel vertical cylinder device 1.

[0064] In addition, the invention can choose automatic cutting equipment or manual cutting method for cutting. When manual cutting is adopted, it is appropriate to use an extended rod cutting gun to cut the line at a high place.

[0065] Therefore, the present application cuts the directional window 1-2, the first foot line D and the second foot line E first, and then cuts the third support line C after determining that the real-time verticality of the steel vertical cylindrical equipment 1 has no dynamic change, so that the steel vertical cylindrical equipment 1 is safely tilted towards the target tilting direction F under the action of its own gravity; since the directional window 1-2, the first support line A, the second support line B and the third support line C meet the conditions one to five, the steel vertical cylindrical equipment 1 can remain stable under the support of the first support line A, the second support line B and the third support line C without verticality change or only with a very small verticality change before the third support line C is cut, so that the deviation between the actual tilting direction of the steel vertical cylindrical equipment 1 and the target tilting direction F is very small, and the problem that the final actual tilting direction deviates greatly from the target tilting direction due to the change of verticality caused by the cutting process before tilting in the prior art directional window tilting and dismantling method is avoided; therefore, the present application has the advantages of small tilting deviation and low safety risk.

[0066] The above is the basic implementation mode of the present embodiment one, and further optimization, improvement and limitation can be made on the basis of the basic implementation mode:

[0067] Preferably, before the step S2 is performed, the initial verticality of the steel vertical cylindrical equipment 1 is measured by an instrument; and after the step S2 is performed, the current verticality of the steel vertical cylindrical equipment 1 is measured by the instrument, and the current verticality is compared with the initial verticality, if the comparison result indicates that the steel vertical cylindrical equipment 1 has a tendency to tilt towards the target tilting direction F, the step S3 is performed; otherwise, it indicates that the tilting tendency of the steel vertical cylindrical equipment 1 deviates greatly from the target tilting direction F, and there is a great safety risk, so the work should be stopped, and the dismantling scheme should be adjusted according to the situation.

[0068] Therefore, by comparing the change of the current verticality and the initial verticality, and performing the step S3 only when it is judged according to the comparison result that the steel vertical cylindrical equipment 1 has a tendency to tilt towards the target tilting direction F, the safety risk caused by the great deviation between the tilting tendency of the steel vertical cylindrical equipment 1 and the target tilting direction F can be effectively avoided, and the safety of the present application is improved.

[0069] Preferably, when the third support line C is cut in the step S5, the real-time verticality of the steel vertical cylindrical equipment 1 is continuously monitored, and when the real-time verticality is monitored to have a dynamic change, it is judged that the steel vertical cylindrical equipment 1 starts to tilt, and the cutting personnel and instruments are notified to quickly retreat to the opposite direction of the tilting direction of the steel vertical cylindrical equipment 1.

[0070] Before the step S1 is performed, it is confirmed that the site of the steel vertical cylindrical equipment 1 meets the safety operation requirements, and then the step S1 is performed.

[0071] Embodiment Two

[0072] On the basis of the above-mentioned embodiment one, the embodiment two also adopts the following preferred implementation manner:

[0073] The directional window 1-2 is a top short bottom long isosceles trapezoidal window; wherein the top edge of the directional window 1-2 is the line between the c point and the d point, and the a point is the midpoint of the top edge; the bottom edge 1-2b of the directional window 1-2 is the line between the e point and the f point, and the b point is the midpoint of the bottom edge 1-2b;

[0074] The specific process of the step S2 includes:

[0075] Step S2-1, cutting the center line 1-2a of the directional window 1-2 in the direction from the a point to the b point;

[0076] Step S2-2, synchronously cutting in the direction from the a point to the c point and in the direction from the a point to the d point, to cut the top edge of the directional window 1-2;

[0077] Step S2-3, synchronously cutting in the direction from the c point to the e point and in the direction from the d point to the f point, to cut the two waist edges of the directional window 1-2;

[0078] Step S2-4, synchronously cutting in the direction from the b point to the e point and in the direction from the b point to the f point, to cut the bottom edge 1-2b of the directional window 1-2.

[0079] Wherein, the steps S2-2 to S2-4 and the step S3 are simultaneously operated by two persons or two instruments, and the steps S2-1 and S5 can be implemented by one person or one instrument.

[0080] Therefore, the steps S2-2 to S2-4 in the present application cut the directional window 1-2 in a symmetrical and synchronous manner, so that the stress balance of the steel vertical cylinder equipment 1 during cutting is balanced, the perpendicularity will not change or only change a little during the cutting process, further ensuring that the actual dumping direction of the steel vertical cylinder equipment 1 deviates from the target dumping direction F.

[0081] In addition, the directional window 1-2 can also be an arc shape.

[0082] The above is the basic implementation manner of the embodiment two, which can be further optimized, improved and limited on the basis of the basic implementation manner:

[0083] Preferably, the first support line A is a line connecting point e and point g, the first foot line D is a line connecting point g and point h, the third support line C is a line connecting point h and point j, the second foot line E is a line connecting point j and point i, and the second support line B is a line connecting point i and point f.

[0084] In the step S3, the first foot line D and the second foot line E are simultaneously cut by synchronous cutting in the direction from point g to point h and in the direction from point i to point j, or by synchronous cutting in the direction from point h to point g and in the direction from point j to point i.

[0085] Therefore, the step S3 in the present application cuts the first foot line D and the second foot line E in a symmetrical and synchronous manner, so that the force balance of the steel vertical cylinder equipment 1 during cutting is balanced, the verticality does not change or only slightly changes due to the cutting process, and further ensures that the deviation between the actual dumping direction of the steel vertical cylinder equipment 1 and the target dumping direction F is small.

[0086] The present application is not limited to the above specific embodiments, and according to the above content, according to the ordinary technical knowledge and conventional means in the art, other various forms of equivalent modifications, replacements or changes can be made without departing from the above basic technical idea of the present application, and all fall within the protection scope of the present application.

Claims

1. A method of directional collapse demolition of a steel vertical cylindrical equipment characterized by: The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1).

2. The method of claim 1, wherein: The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). 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The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder equipment (1). The application relates to a dismantling construction method for a steel vertical cylinder 3. The method of claim 1, wherein: The first support line (A) is a line between e point and g point, the first foot line (D) is a line between g point and h point, the third support line (C) is a line between h point and j point, the second foot line (E) is a line between j point and i point, and the second support line (B) is a line between i point and f point. In the step S3, the first foot line (D) and the second foot line (E) are simultaneously cut by synchronously cutting in the direction from g point to h point and in the direction from i point to j point, or by synchronously cutting in the direction from h point to g point and in the direction from j point to i point.

4. The method of claim 1 to 3, wherein: Before the step S2 is performed, the initial verticality of the steel vertical cylinder equipment (1) is measured by an instrument; and after the step S2 is performed, the current verticality of the steel vertical cylinder equipment (1) is measured by the instrument, and the current verticality is compared with the initial verticality, if the comparison result indicates that the steel vertical cylinder equipment (1) has a tendency to tilt towards the target tilting direction (F), the step S3 is performed; otherwise, the operation is stopped.

5. The method of claim 1 to 3, wherein: When the third support line (C) is cut in the step S5, the real-time verticality of the steel vertical cylinder equipment (1) is continuously monitored, and when a dynamic change of the real-time verticality is monitored, it is judged that the steel vertical cylinder equipment (1) starts to tilt, and the cutting personnel and the instrument are notified to quickly retreat to the opposite direction of the tilting direction of the steel vertical cylinder equipment (1).

6. The method of claim 1 to 3, wherein: Before the step S1 is performed, it is confirmed that the site of the steel vertical cylinder equipment (1) meets the safety operation requirement, and then the step S1 is performed.

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