Method for dismounting and mounting a crane tower

Abstract

The application provides a crane tower dismounting method, which comprises the following steps: detecting the perpendicularity of screw holes on the flange face of the bottom of the tower before the tower is installed; determining the position of the sealing plate on the inner side of the tower when the perpendicularity of a large number of screw holes does not meet the requirements; determining the position corresponding to the sealing plate on the outer side of the tower and determining the cutting area; cutting off the sealing plate on the inner side of the tower; welding the tower and the pier to form an integrated whole after the tower is hoisted to the dismounting station; hoisting the first rack and the second rack to the outer side of the tower respectively; cutting the cutting area by the workers on the first rack and the second rack; hoisting the first rack and the second rack away from the outer side of the tower after the cutting is completed; hoisting the upper part of the tower away from the lower part of the tower along the vertical direction; separating the upper part of the tower from the lower part of the tower; retaining the upper part of the tower; and recycling the upper part of the tower. The method is reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cranes, in particular to a crane tower dismounting method. BACKGROUND

[0002] On the offshore platform, large mechanical equipment is usually needed to hoist cargo, such as a crane, which mainly includes a tower, a hoisting device, a slewing platform and an amplitude changing mechanism. The processing and welding method of the tower plays an important role in the stability and firmness of the tower structure. For example, a patent document with the patent number 201710112122.3 and the publication date of 2017.06.13 discloses a tower structure of an offshore crane and a welding method thereof. The tower structure includes a lower tower structure, a middle tower structure and an upper tower structure connected in sequence. The lower tower structure, the middle tower structure and the upper tower structure each include eight side plates. The tower structure is an octagonal prism. The eight side plates are located on the eight sides of the octagonal prism tower structure, and an octagonal prism cavity is formed inside the eight sides. The thickness of the side plates of the lower tower structure, the thickness of the side plates of the middle tower structure and the thickness of the side plates of the upper tower structure decrease in sequence. The tower structure further includes an upper reinforcing ring, a middle reinforcing ring, a lower reinforcing ring, eight first reinforcing longitudinal bars, four second reinforcing longitudinal bars and four third reinforcing longitudinal bars arranged in the cavity. The reinforcing rings are arranged horizontally on the tower structure, and the reinforcing longitudinal bars are arranged vertically on the tower structure.

[0003] The above-mentioned document only describes how to weld the tower structure to form an integrated tower structure after welding. However, the verticality of the screw holes at the lower end of the tower part is affected during the cutting process, which will affect the subsequent reliable connection between the lower part of the tower and the slewing platform. If the bottom of the tower is directly measured by a measuring tool, a larger measuring surface is needed to achieve reliable and accurate measurement. If the screw holes of the tower are not accurately measured, the entire tower will be discarded, which will cause material waste in the case of less impact on the upper part of the tower. SUMMARY

[0004] The present application aims to provide a crane tower dismounting method, which can conveniently and quickly detect from the bottom whether the lower part of the tower is qualified, and remove the lower part of the tower whose flange surface screw hole verticality does not meet the requirements, so as to retain the upper part of the tower and realize the recycling of the upper part of the tower. The method is reliable.

[0005] To achieve the above-mentioned purpose, a crane tower dismounting method includes the following steps:

[0006] S1 hoist the tower body to a storage station, expose the flange surface at the lower part of the tower body, and then install a detection device on the screw hole of the flange surface, the positioning rod of the detection device is arranged in the screw hole, the rotating rod is sleeved on the positioning rod, the other end of the rotating rod is provided with a dial gauge, and the perpendicularity of the screw hole on the flange surface is detected by rotating the dial gauge to measure whether the value is within the preset deviation range of the screw hole, if the number of screw holes meeting the perpendicularity requirement is greater than the preset number, the tower body is installed on the rotary platform; if the number of screw holes meeting the perpendicularity requirement is less than or equal to the preset number, step S2 is entered;

[0007] S2 determine the position of the inner side sealing plate of the tower body, then mark the position corresponding to the sealing plate on the outer side surface of the tower body, and determine the cutting area on the outer side surface of the tower body, and then cut off the sealing plate on the inner side of the tower body;

[0008] S3 hoist the tower body to a splitting station and fix, the two first racks and the two second racks are arranged on the two sides of the lower part of the tower body respectively;

[0009] S4 weld the fixing member on the outer side surface of the upper part of the tower body above the cutting area through the first rack and the second rack, then cut the cutting area on the outer side surface of the tower body, after the cutting is completed, the first rack and the second rack are respectively hoisted away from the outer side of the tower body, then the upper part of the tower body is hoisted away from the lower part of the tower body along the vertical direction, and whether the cutting end part of the upper part of the tower body is qualified is observed, if qualified, a bevel is formed at the cutting end part; if not qualified, step S5 is entered;

[0010] S5 horizontally arrange a marking line five on the outer side surface of the upper part of the tower body within the preset range from the cutting surface, cut at the marking line five, and then form a bevel;

[0011] S6 install the lower part of the tower body to be butt-jointed on the rotary platform, and hoist the upper part of the tower body provided with the bevel to the lower part of the tower body to be butt-jointed for welding, so as to install the tower body on the rotary platform.

[0012] The above method, since the tower body is integrated before the rotary platform, and since the tower body is relatively large and has a large number of screw holes connected with the rotary platform, the perpendicularity of the screw holes on the flange face needs to be detected before installation, so that it can be determined in advance whether the screw holes meet the assembly requirements, thereby avoiding the situation that the perpendicularity of the screw holes does not meet the requirements during the installation process, so that the installation cannot be continued, resulting in time and labor waste. When the number of screw holes that meet the perpendicularity requirements is less than the preset number, the tower body cannot be installed any more. In order to avoid the entire tower body from being unusable, the tower body is divided into upper and lower parts, the lower part of the tower body that does not meet the requirements is removed, and a bevel is formed on the upper part of the tower body. Then, the tower body is split and the upper part of the tower body is spliced with other lower parts of the tower body through the bench No. 1 and the bench No. 2, so that the upper part of the tower body is spliced with other lower parts of the tower body, thereby realizing the recycling of the upper part of the tower body. The method is reliable, and the rotating rod and the positioning rod are arranged on the detection device. Only the positioning rod needs to be arranged in the threaded hole, and then the threaded hole is rotated through the rotating rod to determine whether the perpendicularity of the threaded hole meets the requirements. The detection device only needs to be installed on the lower part of the tower body, and the tower body does not need to be inverted or the threaded holes need to be tested one by one manually, so that the accuracy of the test is ensured and the test efficiency is improved.

[0013] Further, it further comprises the step S0:

[0014] Before the tower body is lifted, the components inside the tower body are removed.

[0015] The above arrangement avoids damaging the components inside the tower body.

[0016] Further, the step S1 of detecting the perpendicularity of the screw hole comprises S1.1-S1.5,

[0017] S1.1, when the depth of the flange face screw hole is H, the maximum allowable deviation of the corresponding screw hole is K, and then the perpendicularity of the flange face screw hole corresponding to the depth H is calculated The calculation formula of the perpendicularity of the screw hole is as follows:

[0018] ;

[0019] S1.2, the detection ring is placed on the flange face, the center through hole on the ring body in the detection ring is aligned with the flange face screw hole, then the lower end of the positioning rod is screwed into the screw hole through the center through hole, when the lower end of the positioning rod enters the screw hole to a depth of H, the rotation of the positioning rod is stopped, and the detection ring is fixed and attached to the flange face through the fixing member;

[0020] S1.3 the rotating rod is sleeved on the upper end of the positioning rod, then the limiting member is sleeved on the upper end of the positioning rod to limit the rotating rod, then the dial indicator is installed on the end of the rotating rod away from the positioning rod through the locking member, so that the dial indicator is above the upper end face area of the outer ring body of the detection ring;

[0021] S1.4 the rotating rod is rotated, then the dial indicator is driven to rotate and slide around the positioning rod on the upper end face area of the outer ring body of the detection ring, and the maximum value B max , the minimum value B min and the minimum value B min of the dial indicator value are recorded when the rotating rod is located;

[0022] S1.5 the difference value B max between the maximum value B min and the minimum value B is calculated, and the calculation formula of B is as follows:

[0023] ,

[0024] Then the distance d2 from the center of the mounting hole on the rotating rod to the vertical axis of the positioning rod is measured, and the theoretical difference value B' of the perpendicularity of the screw hole detected by the dial indicator is calculated according to the perpendicularity in step S1, and the calculation formula of the theoretical difference value B' is as follows:

[0025] ,

[0026] B is compared with B', and then it is judged whether the perpendicularity of the screw hole meets the requirements.

[0027] The above setting is that when the positioning rod enters the screw hole to a depth of H, the rotation of the positioning rod is stopped. Since the lower end of the positioning rod is completely matched with the screw thread connection of the screw hole, the maximum allowable offset K of the screw hole corresponding to the depth H of the flange face screw hole and the perpendicularity of the screw hole can be calculated. Then after the detection ring is fixed tightly on the flange face and the rotating rod is sleeved on the positioning rod, the rotating rod can drive the dial indicator to rotate around the positioning rod on the upper end face area of the outer ring body of the detection ring, so that the difference value B between the maximum value B max and the minimum value B min of the dial indicator value is measured. Finally, by comparing the theoretical difference value B' with the actual difference value B measured by the dial indicator, it is judged whether the perpendicularity of the flange face screw hole meets the requirements, and the minimum value B minThe direction where the rotating rod is located is the deflection direction of the flange hole, so that the hole can be easily corrected.

[0028] Further, the step S2 further comprises S2.1-S2.5,

[0029] S2.1 measures the distance between the upper end face and the lower end face of the sealing plate in the tower body, and then measures the distance between the lower end face of the sealing plate and the upper end face of the lower part of the tower body;

[0030] S2.2 sets a mark line one and a mark line two horizontally on the outer side of the tower body, so that the distance from the mark line one to the upper end face of the lower part of the tower body is equal to the distance from the lower end face of the sealing plate to the upper end face of the lower part of the tower body, and the distance from the mark line two to the mark line one is equal to the distance from the upper end face to the lower end face of the sealing plate;

[0031] S2.3 sets a center line horizontally between the mark line one and the mark line two, so that the distance from the mark line one to the center line is equal to the distance from the mark line two to the center line, and then sets a mark line three horizontally in the range from one fourth of the distance from the mark line one to the center line to one half of the distance from the mark line one to the center line, and sets a mark line four horizontally in the range from one fourth of the distance from the mark line two to the center line to one half of the distance from the mark line two to the center line;

[0032] S2.4 determines the area between the mark line three and the mark line four as a cutting area;

[0033] S2.5 welds a clamping plate to the lower end of the sealing plate, so that the clamping plate is integrated with the sealing plate, then determines a cutting end face on the sealing plate, and cuts the sealing plate along the cutting end face, so that a root is formed between the cutting end face and the inner side of the tower body after the cutting, and the clamping plate and the sealing plate are removed after the cutting.

[0034] The above setting determines the position of the sealing plate outside the tower body, thereby determining the cutting area outside the tower body, which facilitates subsequent cutting of the tower body, and the root reserved during the cutting of the sealing plate can prevent damage to the inner side of the upper part of the tower.

[0035] Further, the step S3 further comprises:

[0036] Adjusting the height of the second rack to match the height of the cutting area, and matching the distance from the second rack to the cutting area to the distance required by the workers during operation;

[0037] Adjusting the height of the first rack to match the height of the cutting area, and matching the distance from the first rack to the cutting area to the distance required by the workers during operation.

[0038] The above setting facilitates the workers to stand on the first rack and the second rack to perform the cutting work.

[0039] Further, the step S3 also includes:

[0040] Two lifting points are selected on the tower body, then the steel wire rope is fixed on the lifting points, the tower body is lifted to the upper side of the pier by the travelling crane, the flange surface of the bottom plate of the tower body is abutted with the pier, then the steel wire rope is in the straight state; then two rack twos are lifted to one side of the lower part of the tower body, the height of the rack two is adjusted, then two rack ones are lifted to the other side of the lower part of the tower body, the height of the rack one is adjusted, the two rack ones are respectively aligned with the two rack twos in the horizontal direction and the vertical direction of the horizontal line.

[0041] The above setting ensures better stability in the process of lifting the tower body, and avoids large shaking.

[0042] Further, the step S4 also includes:

[0043] The fixing member is sequentially welded on the outer side of the upper part of the tower body, then the fixing members are welded, so that the fixing members on the outer side of the upper part of the tower body are integrally fixed on the outer side of the upper part of the tower body, then the circular carbon rod and the flat carbon rod are used to cut the cutting area on the outer side of the tower body in the clockwise direction.

[0044] The above setting facilitates cutting the depth of the outer side of the tower body to the inner side by the circular carbon rod, and then trimming by the flat carbon rod.

[0045] Further, the step S5 also includes:

[0046] The bevel is outwardly provided at the carbon planing cutting end of the upper part of the tower body, so that the bevel surface is inclined to the carbon planing cutting surface, and the inclination angle between the bevel surface and the carbon planing cutting surface is 40°-60°.

[0047] The above setting can remove the unqualified carbon planing cutting end of the upper part of the tower body after disassembly, and facilitate the butt joint of the upper part of the tower body and the lower part of the tower body by providing the bevel, so as to realize the recycling of the upper part of the tower body and save the cost.

[0048] Further, the step S1.5 compares B with B', and further includes S1.5.1-S1.5.2,

[0049] S1.5.1 if B is less than or equal to B', it is judged that the perpendicularity of the flange surface screw hole meets the requirements;

[0050] S1.5.2 if B is greater than If B' is greater than B, it is determined that the perpendicularity of the flange surface screw hole does not meet the requirements.

[0051] The above settings can accurately determine whether the perpendicularity of the screw hole meets the requirements, thereby facilitating installation. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 The workflow diagram of the present application.

[0053] Figure 2 The front view of the present application.

[0054] Figure 3 The side view of the present application.

[0055] Figure 4 The schematic diagram of the sealing plate connected to the inside of the tower body in the present application.

[0056] Figure 5 The schematic diagram of the carbon removal planing cutting end of the upper part of the tower body in the present application.

[0057] Figure 6 The schematic diagram of the beveling of the upper part of the tower body in the present application.

[0058] Figure 7 The schematic diagram of the cutting area marking of the outer side of the tower body in the present application.

[0059] Figure 8 The side view of the present application for detecting the perpendicularity of the screw hole.

[0060] Figure 9 The top view of the present application for detecting the perpendicularity of the screw hole.

[0061] Figure 10 The schematic diagram of the perpendicularity measurement of the screw hole when the depth is H in the present application.

[0062] Figure 11 The schematic diagram of the tower body placed between the bench one and the bench two in the present application. DETAILED DESCRIPTION

[0063] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0064] As shown in the drawings, a crane tower body dismounting method comprises the following specific steps: Figures 1 to 11

[0065] S0 Before hoisting the tower body, remove the components inside the tower body, so as to avoid damaging the components inside the tower body.

[0066] ​S1 selects two lifting points on the tower body, lifts the tower body to a resting station through a travelling crane, the resting station is a frame body provided with a hollow hole at the upper end, the size of the hollow hole is matched with the maximum area of the threaded hole provided on the flange face of the lower part of the tower body, then installs the detection device on the threaded hole of the flange face a5, detects the perpendicularity of the threaded hole a6 on the flange face a5 in sequence, including S1.1-S1.5,

[0067] S1.1, when the depth of the threaded hole a6 of the flange face a5 is H, the maximum allowable deviation of the threaded hole a6 is K, then the perpendicularity of the threaded hole a6 corresponding to the depth H of the threaded hole of the flange face a5 is calculated , the calculation formula of the perpendicularity of the threaded hole is as follows:

[0068] ;

[0069] S1.2, places the detection ring on the flange face a5, aligns the center through hole a44 provided on the inner ring body a41 of the detection ring with the threaded hole a6 of the flange face, then screws the lower end of the positioning rod a1 through the center through hole a44 with the threaded hole a6, when the lower end of the positioning rod a1 enters the threaded hole a6 to the depth H, stops rotating the positioning rod a1, and fixes the detection ring on the flange face a5 through the fixing piece a9;

[0070] S1.3, sleeves the rotating rod a2 on the upper end of the positioning rod, then sleeves the limiting piece a11 on the upper end of the positioning rod a1 to limit the rotating rod a2, then installs the dial gauge a3 on the end of the rotating rod a2 away from the positioning rod a1 through the locking piece, so that the dial gauge a3 is located above the upper end face area a45 of the outer ring body a42 of the detection ring, and the pointer of the dial gauge a3 abuts against the upper end face area a45 of the outer ring body a42 of the detection ring;

[0071] S1.4, in this embodiment, first rotates the rotating rod clockwise by 360°, drives the dial gauge a3 to rotate clockwise by 360° around the positioning rod a1 on the upper end face area a45 of the outer ring body a42 of the detection ring, and records the maximum value B max1 and the minimum value B min1 in the dial gauge a3 value in the clockwise rotation process, then rotates the rotating rod counterclockwise by 360°, drives the dial gauge a3 to rotate counterclockwise by 360° around the positioning rod a1 on the upper end face area a45 of the outer ring body a42 of the detection ring, and records the maximum value B max2 and the minimum value B min2 in the dial gauge a3 value in the counterclockwise rotation process, then takes the larger value between the maximum value B max1 and the maximum value B max2 as the maximum value B max in the dial gauge a3 value in the rotation process, and takes the minimum value Bmin1 and the minimum value B min2 the smaller value of the two as the minimum value B in the dial indicator a3 value during rotation min , by rotating the rotating rod in different directions, the dial indicator gets two sets of data, by comparing the two sets of data, more accurate data can be obtained, avoiding inaccurate data caused by accidental factors, and recording the minimum value B min the position of the rotating rod a2 at this time, the direction of the rotating rod a2 at this time is the deflection direction of the screw hole;

[0072] S1.5 calculate the maximum value B max and the minimum value B min B, The calculation formula of B is as follows:

[0073] ,

[0074] Then measure the distance d2 from the center of the mounting hole on the rotating rod a2 to the vertical axis of the positioning rod, and calculate the theoretical difference B' of the perpendicularity of the screw hole detected by the dial indicator according to the perpendicularity in step S1. B', the calculation formula of the theoretical difference B' is as follows:

[0075] ,

[0076] Then compare B with B', B', enter steps S1.5.1~ S1.5.2 to judge whether the perpendicularity of the screw hole a6 meets the requirements,

[0077] S1.5.1 if B is less than or equal to B', B', it is judged that the perpendicularity of the flange surface screw hole a6 meets the requirements;

[0078] S1.5.2 if B is greater than B', B', it is judged that the perpendicularity of the flange surface screw hole a6 does not meet the requirements;

[0079] After detecting all the screw holes a6 on the flange surface a5, if the number of screw holes meeting the perpendicularity requirements is less than or equal to the preset number, enter step S2, in this embodiment, the preset number of screw holes meeting the perpendicularity requirements is three quarters of all the screw holes on the flange surface.

[0080] ​​​​​​S2 determines the position of the inner side sealing plate 4 of the tower body, then marks the position corresponding to the sealing plate 4 on the outer side surface 31 of the tower body, and determines the cutting area 33 on the outer side surface 31 of the tower body, then cuts off the sealing plate 4 on the inner side of the tower body, including S2.1-S2.5,

[0081] S2.1 measures the distance between the upper end surface 41 and the lower end surface 42 of the sealing plate 4 on the inner side of the tower body, and then measures the distance between the lower end surface 42 of the sealing plate and the upper end surface 211 of the bottom plate 21 of the lower part 2 of the tower body;

[0082] S2.2 sets a marking line one 11 and a marking line two 12 horizontally on the outer side surface 31 of the tower body, so that the distance from the marking line one 11 to the upper end surface 211 of the bottom plate 21 of the lower part 2 of the tower body in the direction perpendicular to the bottom plate 21 of the lower part 2 of the tower body is equal to the distance from the lower end surface 42 of the sealing plate 4 to the upper end surface 211 of the bottom plate 21 of the lower part 2 of the tower body, and the distance from the marking line two 12 to the marking line one 11 in the direction perpendicular to the bottom plate 21 of the lower part 2 of the tower body is equal to the distance between the upper end surface 41 and the lower end surface 42 of the sealing plate 4;

[0083] S2.3 sets a center line 5 horizontally between the marking line one 11 and the marking line two 12, so that the vertical distance from the marking line one 11 to the center line 5 is equal to the vertical distance from the marking line two 12 to the center line 5, and then sets a marking line three 13 horizontally within the range of one fourth of the distance from the marking line one 11 to the center line 5 to one half of the distance from the marking line one 11 to the center line 5, and sets a marking line four 14 horizontally within the range of one fourth of the distance from the marking line two 12 to the center line 5 to one half of the distance from the marking line two 12 to the center line 5, and in this embodiment, the marking line one 11, the marking line two 12, the marking line three 13, the marking line four 14 and the center line 5 on the same outer side surface 31 of the tower body are arranged parallel to each other;

[0084] S2.4 determines the area between the marking line three 13 and the marking line four 14 as the cutting area 33, and in this embodiment, the distance from the marking line three 13 to the center line 5 is equal to one fourth of the distance from the marking line one 11 to the center line 5, and the distance from the marking line four 14 to the center line 5 is equal to one fourth of the distance from the marking line two 12 to the center line 5;

[0085] S2.5welds the clamping plate 6 at the lower end of the sealing plate 4, so that the clamping plate 6 is connected with the sealing plate 4 to form an integral body, supporting the sealing plate 4, and then determines the cutting end face 43 on the sealing plate 4, in this embodiment, the marking line six (not marked in the figure) is horizontally arranged at the position 10 mm extending along the direction perpendicular to the inner side surface 32 of the tower body, the plane passing through the marking line six and parallel to the inner side surface 32 of the tower body is determined as the cutting end face 43, and the gas cutting is performed along the cutting end face 43, so that the root 7 is formed between the cutting end face 43 and the inner side surface 32 of the tower body after the cutting of the sealing plate 4, that is, the thickness of the root 7 is 10 mm, which can effectively prevent the inner side surface 32 of the upper part 8 of the tower body from being damaged in the gas cutting process, and the clamping plate 6 and the sealing plate 4 are removed after the cutting.

[0086] S3lifts the pier 1 to the disassembly station by the travelling crane, then selects two lifting points on the tower body, and fixes the steel wire rope on the lifting points, pulls the steel wire rope by the travelling crane to lift the tower body to the upper side of the pier 1 in the erected state, so that the flange surface of the bottom plate 21 of the lower part 2 of the tower body abuts against the pier 1, after the flange surface of the bottom plate 21 of the lower part 2 of the tower body abuts against the pier 1, controls the travelling crane to make the steel wire rope in the straightened state, then welds two or more than two stop plates 3 between the pier 1 and the lower part 2 of the tower body, so as to fix the tower body on the disassembly station, in this embodiment, the stop plates 3 are arranged as four, and the four stop plates 3 are circumferentially distributed and welded on the outer side of the lower part 2 of the tower body, so as to stably fix and connect the lower part 2 of the tower body on the pier 1, then lifts two rack twos z2 to one side of the lower part 2 of the tower body, adjusts the height of the rack two z2, so that the height of the rack two z2 matches the height of the cutting area 33, and at the same time, the distance from the rack two z2 to the cutting area 33 matches the distance required by the worker when working, then lifts two rack ones z1 to the other side of the lower part 2 of the tower body, adjusts the height of the rack one z1, so that the height of the rack one z1 matches the height of the cutting area 33, and at the same time, the distance from the rack one z1 to the cutting area 33 matches the distance required by the worker when working, and makes the two rack ones z1 respectively aligned with the two rack twos z2 in the direction of the horizontal line and the direction perpendicular to the horizontal line.

[0087] S4, the fixed part 9 is welded on the outer side 31 of the tower upper part 8 above the cutting area 33 by the gantry one z1 and the gantry two z2, in this embodiment, the fixed part 9 is located 20mm above the cutting area, the fixed part 9 is welded on the outer side 31 of the tower upper part 8 in turn, then the fixed part 9 is welded between each other, so that the fixed part on the outer side 31 of the tower upper part 8 is integrated on the outer side 31 of the tower upper part 8, then the carbon planing cutting is carried out on the outer side 31 of the tower upper part 8 by using the round carbon rod and the flat carbon rod in turn, after the cutting is completed, the gantry one z1 and the gantry two z2 are lifted away from the outer side of the tower, then the tower upper part 8 is lifted along the vertical direction away from the tower lower part 2, then a period of time is kept, and whether the carbon planing cutting end of the tower upper part 8 is qualified is observed, if yes, the tower upper part 8 is lifted to the storage position by the travelling crane, the fixed part 9 is removed, and the bevel is opened on the carbon planing cutting end; if not, step S5 is entered, in this embodiment, the wind pressure of the round carbon rod and the flat carbon rod is 0.4-0.6MPa, the current is 400-450A, and the fixed part 9 is the channel steel.

[0088] S5, the marking line five 15 is horizontally arranged on the outer side 31 of the tower upper part 8 within the range of 500-600mm from the carbon planing cutting surface 81, the carbon planing cutting is carried out at the marking line five 15, in this embodiment, the vertical distance between the marking line five 15 and the carbon planing cutting surface 81 is 600mm, the bevel is opened after the cutting, the bevel 10 is opened on the carbon planing cutting end of the tower upper part 8 outwardly, the bevel slope 111 is arranged obliquely with the carbon planing cutting surface 81, and the inclination angle between the bevel slope 111 and the carbon planing cutting surface 81 is 40°-60°, in this embodiment, the inclination angle a between the bevel slope 111 and the carbon planing cutting surface 81 is 45°, the bevel 10 is opened, so that the tower upper part 8 is conveniently connected with other tower lower parts, the tower upper part 8 is recycled, and the cost is saved.

[0089] S6, the tower lower part to be connected is installed on the rotary platform, and the tower upper part provided with the bevel is lifted to the tower lower part to be connected to be welded, so that the tower is installed on the rotary platform, specifically, two gantry twos are moved to one side of the tower lower part to be connected, and the height of the two gantry twos is located at the height of the upper end of the tower to be connected, then two gantry ones are lifted to the other side of the tower lower part to be connected, and the height of the two gantry ones is located at the height of the upper end of the tower to be connected, then the tower upper part 8 provided with the bevel and the tower lower part to be connected are welded by the two gantry ones and the two gantry twos.

[0090] The working principle of the application is: the perpendicularity of the screw holes of the flange face of the bottom of the tower body is detected before the tower body is installed, when the perpendicularity of a large number of screw holes does not meet the requirements after detection, the position of the sealing plate on the inner side of the tower body is determined, and then the position corresponding to the sealing plate on the outer side of the tower body is determined, and the cutting area is determined, then the sealing plate on the inner side of the tower body is cut off, the tower body is hoisted to the splitting station and welded with the pier to form an integral body, and the rack one and the rack two are hoisted to the outer side of the tower body, so that the workers cut the cutting area on the rack one and the rack two, after cutting is completed, the rack one and the rack two are hoisted away from the outer side of the tower body, the upper part of the tower body is hoisted away from the lower part of the tower body 2, the upper part of the tower body is separated from the lower part, so that the upper part of the tower body 8 is retained, the recycling of the upper part of the tower body is realized, and the method is reliable.

Claims

1. A method of disassembling a crane tower, characterized by: The method comprises the following steps: S1, the tower body is hoisted to a storage position, the flange surface of the lower part of the tower body is exposed, and then a detection device is installed on the screw hole of the flange surface, the positioning rod of the detection device is arranged in the screw hole, the rotating rod is sleeved on the positioning rod, the other end of the rotating rod is provided with a dial gauge, and the perpendicularity of the screw hole on the flange surface is detected by rotating the dial gauge to measure whether the value is within the preset deviation range of the screw hole; if the number of screw holes meeting the perpendicularity requirement is less than or equal to the preset number, step S2 is entered; S2, the position of the inner side sealing plate of the tower body is determined, then the position corresponding to the sealing plate is marked on the outer side surface of the tower body, and the cutting area is determined on the outer side surface of the tower body, and then the sealing plate on the inner side of the tower body is cut off; S3, the tower body is hoisted to a splitting position and fixed, and the two first racks and the two second racks are arranged on the two sides of the lower part of the tower body; S4, the fixing member is welded and fixed on the outer side surface of the upper part of the tower body above the cutting area through the first rack and the second rack, then the carbon planer cutting is performed on the cutting area of the outer side surface of the tower body, after the cutting is completed, the first rack and the second rack are respectively hoisted away from the outer side surface of the tower body, then the upper part of the tower body is hoisted away from the lower part of the tower body along the vertical direction, and whether the cutting end part of the upper part of the tower body is qualified is observed; if yes, a bevel is formed at the cutting end part; if not, step S5 is entered; S5, a mark line five is arranged horizontally on the outer side surface of the upper part of the tower body within a preset range from the carbon planer cutting surface, and the carbon planer cutting is performed at the mark line five, and then a bevel is formed; S6, the lower part of the tower body to be butt-jointed is arranged on a rotary platform, and the upper part of the tower body provided with a bevel is hoisted to the lower part of the tower body to be butt-jointed to be welded, so that the tower body is arranged on the rotary platform.

2. A method of disassembling a crane tower according to claim 1, characterized in that: Further comprising a step S0: before the tower body is hoisted, the components in the tower body are removed.

3. A method of disassembling a crane tower according to claim 1, characterized in that: The step S1 of detecting the perpendicularity of the screw hole comprises S1.1-S1.5, S1.1 preset the depth of the flange surface screw hole is H, the corresponding maximum allowable offset of the screw hole is K, and then the perpendicularity of the screw hole corresponding to the depth of the flange surface screw hole is H is calculated , the calculation formula of the perpendicularity of the screw hole is as follows: ； S1.2, the detection ring is placed on the flange surface, the central through hole arranged on the inner ring body of the detection ring is aligned with the screw hole of the flange surface, then the lower end of the positioning rod is screwed into the screw hole through the central through hole, and when the lower end of the positioning rod enters the screw hole to a depth of H, the rotation of the positioning rod is stopped, and the detection ring is fixed and attached to the flange surface through the fixing member; S1.3, the rotating rod is sleeved on the upper end of the positioning rod, then the limiting member is sleeved on the upper end of the positioning rod to limit the rotating rod, and then the dial gauge is installed on the end of the rotating rod away from the positioning rod through the locking member, so that the dial gauge is located above the outer ring body of the detection ring; S1.4 rotate the rotating rod, then drive the dial gauge to slide around the positioning rod in the upper end surface area of the outer ring body of the detection ring, and record the maximum value B of the dial gauge value max , the minimum value B min , and the position of the rotating rod when the minimum value B min is reached; S1.5 Calculate the maximum value B max The difference between the minimum value B min B, The calculation formula of B is as follows:​ ， Then the distance d2 from the center of the mounting hole on the rotating rod to the vertical axis of the positioning rod is measured, and the perpendicularity error B' is calculated according to the perpendicularity error B in step S1 The theoretical difference of the perpendicularity of the threaded hole detected by the dial gauge is calculated B', the theoretical difference The calculation formula of B' is as follows: ， Comparison B and B', and further determines whether the perpendicularity of the threaded hole meets the requirements.

4. A method of disassembling a crane tower according to claim 1, characterized in that: The step S2 further comprises S2.1-S2.5, S2.1, the distance from the upper end surface of the sealing plate to the lower end surface is measured in the tower body, and then the distance from the lower end surface of the sealing plate to the upper end surface of the bottom plate of the lower part of the tower body is measured; S2.2, the mark line one and the mark line two are arranged horizontally on the outer side surface of the tower body, the distance from the mark line one to the upper end surface of the bottom plate of the lower part of the tower body is equal to the distance from the lower end surface of the sealing plate to the upper end surface of the bottom plate of the lower part of the tower body, and the distance from the mark line two to the mark line one is equal to the distance from the upper end surface of the sealing plate to the lower end surface. S2.3 horizontally setting a center line between the first marking line and the second marking line, so that the distance from the first marking line to the center line is equal to the distance from the second marking line to the center line, then horizontally setting the third marking line in the range of one fourth of the distance from the first marking line to the center line to one half of the distance from the first marking line to the center line, and horizontally setting the fourth marking line in the range of one fourth of the distance from the second marking line to the center line to one half of the distance from the second marking line to the center line, with the center line as the reference; S2.4 determining the area between the third marking line and the fourth marking line as the cutting area; S2.5 welding the clamping plate to the lower end of the sealing plate, so that the clamping plate is connected with the sealing plate to form an integral whole, then determining the cutting end face on the sealing plate, and cutting the sealing plate along the cutting end face, so that the root is formed between the cutting end face and the inner side face of the tower body after the cutting, and the clamping plate and the sealing plate are removed after the cutting.

5. A method of disassembling a crane tower according to claim 1, characterized in that: The step S3 further comprises: adjusting the height of the second bracket so that the height of the second bracket matches the height of the cutting area, and the distance from the second bracket to the cutting area matches the distance required when the worker is working; adjusting the height of the first bracket so that the height of the first bracket matches the height of the cutting area, and the distance from the first bracket to the cutting area matches the distance required when the worker is working.

6. A method of disassembling a crane tower according to claim 1, characterized in that: The step S3 further comprises: selecting two lifting points on the tower body, then fixing the steel wire rope on the lifting points, lifting the tower body above the pier by the travelling crane, and making the steel wire rope in the straightened state after the flange face of the lower bottom plate of the tower body abuts against the pier; then lifting the two second brackets to one side of the lower part of the tower body, adjusting the height of the second bracket, then lifting the two first brackets to the other side of the lower part of the tower body, adjusting the height of the first bracket, and the two first brackets are aligned with the two second brackets in the horizontal direction and the direction perpendicular to the horizontal direction respectively.

7. A method of disassembling a crane tower according to claim 1, characterized in that: The step S4 further comprises: welding the fixing members around the upper part of the tower body to the outer side face of the upper part of the tower body in sequence, then welding between the fixing members, so that the fixing members on the outer side face of the upper part of the tower body are integrally fixed on the outer side face of the upper part of the tower body, then using the round carbon rod and the flat carbon rod to perform the carbon planing cutting in the clockwise direction around the tower body on the cutting area of the outer side face of the tower body.

8. A method of disassembling a crane tower according to claim 1, characterized in that: The step S5 further comprises: opening the bevel outward at the carbon planing cutting end of the upper part of the tower body with the carbon planing cutting face as the reference, so that the bevel is inclined to the carbon planing cutting face, and the inclination angle between the bevel and the carbon planing cutting face is 40°-60°.

9. A method according to claim 3, wherein: The comparison in step S1.5 B and B', also comprising S1.5.1~ S1.5.2, S1.5.1 if B is less than or equal to B′, it is determined that the perpendicularity of the flange surface screw hole meets the requirements; S1.5.2 if B is greater than B′, it is judged that the perpendicularity of the flange surface screw hole does not meet the requirements.

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