Crane tower body dismounting and mounting method

Abstract

According to the crane tower body disassembling and assembling method, the perpendicularity of the screw holes in the flange face of the bottom of the tower body is detected before the tower body is installed, the position of the sealing plate on the inner side of the tower body is determined when the perpendicularity of many screw holes does not meet the requirement after detection, and then the position corresponding to the sealing plate can be determined on the outer side face of the tower body; a cutting area is determined, then a sealing plate on the inner side of the tower body is cut off, the tower body is hoisted to a splitting station and then welded with an abutment to form a whole, the first rack and the second rack are hoisted to the outer side of the tower body correspondingly, a worker cuts the cutting area on the first rack and the second rack, and after cutting is completed, the first rack and the second rack are hoisted away from the outer side of the tower body correspondingly; the upper portion of the tower body is lifted away from the lower portion of the tower body in the vertical direction, the upper portion and the lower portion of the tower body are separated, and therefore the upper portion of the tower body is reserved and recycled, and the method is reliable.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a method for disassembling and assembling a crane tower body. Background Art

[0002] On an offshore platform, large mechanical equipment is usually required to lift cargo, such as a crane. The crane mainly includes a tower body, a lifting device, a slewing platform and a luffing mechanism. The processing and welding method of the tower body plays an important role in the stability and firmness of the tower body structure. For example, the patent document with Chinese patent number 201710112122.3 and announcement date 2017.06.13 discloses a tower body structure of an offshore crane and a welding method thereof. The tower body structure includes a tower body lower structure, a tower body middle structure and a tower body upper structure connected in sequence. The tower body lower structure, the tower body middle structure and the tower body upper structure are connected in sequence. Both the middle structure and the upper structure of the tower include eight side panels. The tower structure is in the shape of an octagonal pyramid. The eight side panels are located on the eight sides of the octagonal pyramid-shaped tower structure, and an octagonal pyramid-shaped cavity is formed inside the eight sides. The thickness of the side panels of the lower structure of the tower, the side panels of the middle structure of the tower, and the side panels of the upper structure of the tower decrease in sequence. The tower structure also includes upper reinforcing ring bars, middle reinforcing ring bars, lower reinforcing ring bars, eight first reinforcing longitudinal bars, four second reinforcing longitudinal bars and four third reinforcing longitudinal bars arranged in the cavity. The reinforcing ring bars are arranged transversely on the tower structure, and the reinforcing longitudinal bars are arranged longitudinally on the tower structure.

[0003] The above document only explains how to weld the tower body structure so that the welded components form an integrated tower body structure. However, for the tower body part formed by cutting, it is affected by heat during the cutting process, which will affect the verticality of the screw holes at the lower end of the tower body part. This will cause the subsequent lower part of the tower body to be unable to be reliably aligned with the rotating platform. If the bottom of the tower body is directly measured by a measuring tool, a large measuring surface is required and reliable and accurate measurement cannot be achieved. In addition, if the measurement of the tower body screw holes is inaccurate, the entire tower body will be directly discarded. If the impact on the upper part of the tower body is small, it will lead to material waste. Summary of the invention

[0004] The purpose of the present invention is to provide a method for disassembling and assembling a crane tower body, wherein a detection device can conveniently and quickly detect whether the lower part of the tower body is qualified from the bottom, and the lower part of the tower body is removed when the verticality of the screw hole on the flange surface does not meet the requirements, thereby retaining the upper part of the tower body and realizing the recycling of the upper part of the tower body, and the method is reliable.

[0005] To achieve the above object, a crane tower disassembly and assembly method comprises the following steps: S1: The tower body is hoisted to the storage station, the flange surface of the lower part of the tower body is exposed, and then the detection device is installed on the screw hole of the flange surface. The positioning rod of the detection device is set in the screw hole, and the rotating rod is set on the positioning rod. The other end of the rotating rod is provided with a dial indicator. The dial indicator is rotated by the rotating rod to measure whether the value is within the preset deviation range of the screw hole to perform verticality detection on the screw hole on the flange surface. If the number of screw holes that meet the verticality requirements is greater than the preset number, the tower body is installed on the rotating platform; if the number of screw holes that meet the verticality requirements is less than or equal to the preset number, enter step S2; S2 determines the position of the sealing plate inside the tower body, then marks the position corresponding to the sealing plate on the outer side of the tower body, determines the cutting area on the outer side of the tower body, and then cuts off the sealing plate inside the tower body; S3: The tower body is hoisted to the splitting station for fixing, and two racks 1 and two racks 2 are respectively arranged on both sides of the lower part of the tower body; S4: Weld the fixing parts on the outer side of the upper part of the tower body above the cutting area through the first and second stands, and then cut the cutting area on the outer side of the tower body. After the cutting is completed, the first and second stands are respectively lifted off the outer side of the tower body, and then the upper part of the tower body is lifted off the lower part of the tower body in the vertical direction, and observe whether the cut end of the upper part of the tower body is qualified. If qualified, a groove is opened at the cut end; if unqualified, enter step S5; S5. A mark line 5 is horizontally set on the outer surface of the upper part of the tower body within a preset range from the cutting surface, cutting is performed at the mark line 5, and a groove is opened after cutting; S6 installs the lower part of the tower body to be connected on the rotating platform, and hoists the upper part of the tower body with the groove to the lower part of the tower body to be connected for welding to achieve the installation of the tower body on the rotating platform.

[0006] In the above method, since the tower body is installed in an integrated manner before the rotating platform, and since the tower body is relatively large and has a large number of screw holes connected to the rotating platform, the verticality of the screw holes on the flange surface needs to be detected before installation, so that it is possible to obtain in advance whether the screw holes meet the assembly requirements, thereby avoiding the discovery during the installation process that the verticality of the screw holes does not meet the requirements, thereby being unable to continue the installation and causing time and effort. When it is detected that the number of screw holes that meet the verticality requirements is less than the preset number, the tower body cannot be installed further. In order to avoid the entire tower body being unusable, the tower body is divided into upper and lower parts, the lower part of the tower body that does not meet the screw holes requirements is removed, and the tower body is connected to the rotating platform. By opening a groove at the upper part of the tower body, and then using the stand one and the stand two to split the tower body and splice the upper part of the tower body with other lower parts of the tower body, it is convenient to splice the upper part of the tower body with other lower parts of the tower body, so as to realize the recycling of the upper part of the tower body. The method is reliable, and by arranging a rotating rod and a positioning rod on the detection device, it is only necessary to set the positioning rod in the threaded hole and then rotate the rotating rod to determine whether the verticality of the threaded hole meets the requirements. It is only necessary to install the detection device from the lower part of the tower body, without inverting the tower body or manually testing the threaded holes one by one, which ensures the accuracy of the test while improving the test efficiency.

[0007] Furthermore, the method further comprises step S0: Before lifting the tower body, remove the internal components of the tower body.

[0008] The above arrangement avoids damage to components inside the tower.

[0009] Furthermore, the step S1 of detecting the verticality of the screw hole includes S1.1 to S1.5. S1.1 When the depth of the screw hole on the flange surface is preset to H, the corresponding maximum allowable offset of the screw hole is K, and then the verticality of the screw hole corresponding to the depth of the screw hole on the flange surface is calculated. , screw hole verticality The calculation formula is as follows: ; S1.2 Place the detection ring on the flange surface, align the central through hole set on the inner ring body of the detection ring with the screw hole on the flange surface, and then pass the lower end of the positioning rod through the central through hole and thread it into the screw hole. When the lower end of the positioning rod enters the screw hole to a depth of H, stop the rotation of the positioning rod and fix the detection ring on the flange surface with the fixing parts; S1.3 Sleeve the rotating rod on the upper end of the positioning rod, then sleeve the limit piece on the upper end of the positioning rod to limit the rotating rod, and then install the dial indicator on the end of the rotating rod away from the positioning rod through the locking piece, so that the dial indicator is located above the outer ring body of the detection ring; S1.4 Rotate the rotating rod, and then drive the dial indicator to rotate and 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 in the dial indicator value max , minimum value B min and the minimum value B min The position of the rotating rod when S1.5 Calculate the maximum value B max With minimum value B min The difference between B, The calculation formula of B is as follows: , Then measure the distance d2 from the center of the mounting hole on the rotating rod to the vertical axis of the positioning rod, and according to the verticality in step S1 Calculate the theoretical difference of the verticality of the screw hole detected by the dial indicator B', theoretical difference The calculation formula of B' is as follows: , Compare B and B', and then determine whether the verticality of the screw hole meets the requirements.

[0010] With the above settings, when the lower end of the positioning rod enters the screw hole to a depth of H, the positioning rod is stopped from rotating. Since the lower end of the positioning rod and the screw hole are completely matched and threaded, the maximum allowable offset K and the verticality of the screw hole corresponding to the depth of the flange screw hole H can be calculated. Then, after the detection ring is fixed tightly against the flange surface and the rotating rod is sleeved on the positioning rod, the rotating rod can drive the dial indicator to rotate around the positioning rod in the upper end surface area of ​​the outer ring body of the detection ring, thereby measuring the maximum value B in the dial indicator value max With minimum value B min The difference between B, and finally by comparing the theoretical difference The difference between B' and the actual value measured by the dial indicator B, so as to judge whether the verticality of the flange screw hole meets the requirements, and the minimum value B recorded by the dial indicator min The direction of the rotating rod is the deflection direction of the screw hole on the flange surface, which makes it easy to correct the screw hole.

[0011] Furthermore, the step S2 also includes S2.1 to S2.5, S2.1 Measure the distance from the upper end face to the lower end face of the sealing plate inside the tower body, and then measure the distance from the lower end face of the sealing plate to the upper end face of the bottom plate at the bottom of the tower body; S2.2 Marking line 1 and marking line 2 are horizontally set on the outer side of the tower body, so that the distance from marking line 1 to the upper end face of the lower bottom plate of the tower body is equal to the distance from the lower end face of the cover plate to the upper end face of the lower bottom plate of the tower body, and the distance from marking line 2 to marking line 1 is equal to the distance from the upper end face of the cover plate to the lower end face; S2.3 Set the center line horizontally between the first and second dimension lines, so that the distance from the first dimension line to the center line is equal to the distance from the second dimension line to the center line. Then, based on the center line, set the third dimension line horizontally within a range from one quarter of the distance from the first dimension line to one half of the distance from the first dimension line to the center line, and set the fourth dimension line horizontally within a range from one quarter of the distance from the second dimension line to one half of the distance from the second dimension line to the center line. S2.4 determine the area between the marked line 3 and the marked line 4 as the cutting area; S2.5 Weld a clamping plate at the lower end of the sealing plate so that the clamping plate and the sealing plate are connected to form a whole, then determine the cutting end face on the sealing plate, and cut the sealing plate along the cutting end face so that after the sealing plate is cut, a root is formed between the cutting end face and the inner side of the tower body, and remove the clamping plate and the sealing plate after cutting.

[0012] The above settings determine the position of the sealing plate outside the tower body, thereby determining the cutting area outside the tower body, which is convenient for subsequent tower body cutting. Reserving the root during the sealing plate cutting process can prevent damage to the inner side of the upper part of the tower body.

[0013] Furthermore, the step S3 also includes: Adjust the height of the second platform to match the height of the second platform with the height of the cutting area, and at the same time, match the distance from the second platform to the cutting area with the distance required by the staff when working; The height of the platform 1 is adjusted to match the height of the platform 1 with the height of the cutting area, and the distance from the platform 1 to the cutting area matches the distance required by the staff during operation.

[0014] The above arrangement makes it convenient for the workers to stand on the first and second stands to perform cutting work.

[0015] Furthermore, the step S3 also includes: Select two lifting points on the tower body, then fix the wire rope on the lifting points, lift the tower body to the top of the pier by the crane, and keep the wire rope in a straight state after the flange surface of the lower bottom plate of the tower body abuts against the pier; then lift the two gantry twos to one side of the lower part of the tower body, adjust the height of gantry two, and then lift the two gantry ones to the other side of the lower part of the tower body, adjust the height of gantry one, and align the two gantry ones with the two gantry twos in the direction of the horizontal line and in the direction perpendicular to the horizontal line respectively.

[0016] The above settings ensure better stability during the process of lifting the tower body and avoid large shaking.

[0017] Furthermore, the step S4 also includes: The fixing parts are welded to the outer side of the upper part of the tower body in sequence around the upper part of the tower body, and then the fixing parts are welded between each other so that the fixing parts on the outer side of the upper part of the tower body are integrally fixed to the outer side of the upper part of the tower body, and then a round carbon rod and a flat carbon rod are used in the cutting area of ​​the outer side of the tower body to carry out carbon planing cutting around the tower body clockwise.

[0018] The above arrangement facilitates firstly cutting the depth from the outer side surface to the inner side surface of the tower body by means of a round carbon rod, and then trimming it by means of a flat carbon rod.

[0019] Furthermore, the step S5 further includes: Taking the carbon planer cutting surface as a reference, a groove is opened outward at the carbon planer cutting end of the upper part of the tower body, so that the groove slope is inclined to the carbon planer cutting surface, and the inclination angle between the groove slope and the carbon planer cutting surface is 40°~60°.

[0020] The above arrangement can remove the unqualified carbon planer cutting ends of the upper tower body after the splitting, and by opening a groove, it is convenient to connect the upper tower body with other lower tower bodies, so as to realize the recycling of the upper tower body and save costs.

[0021] Furthermore, in step S1.5, the comparison B and B', also includes S1.5.1~ S1.5.2, S1.5.1 If B is less than or equal to B', it is judged that the verticality of the screw hole on the flange surface meets the requirements; S1.5.2 If B is greater than B', it is judged that the verticality of the screw hole on the flange surface does not meet the requirements.

[0022] The above settings can accurately determine whether the verticality of the screw hole meets the requirements, thereby facilitating installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the work flow chart of the present invention.

[0024] Figure 2 It is the front view of the present invention.

[0025] Figure 3 It is a side view of the present invention.

[0026] Figure 4 It is a schematic diagram of the sealing plate connected to the inner side of the tower body in the present invention.

[0027] Figure 5It is a schematic diagram of removing the carbon planer cutting end portion of the upper part of the tower body in the present invention.

[0028] Figure 6 It is a schematic diagram of the bevel opening on the upper part of the tower body in the present invention.

[0029] Figure 7 It is a schematic diagram of marking the cutting area on the outer side of the tower body of the present invention.

[0030] Figure 8 It is a side view of detecting the verticality of the screw hole in the present invention.

[0031] Fig. 9 It is a top view of detecting the verticality of the screw hole in the present invention.

[0032] Fig.10 Schematic diagram of the present invention when the depth of the screw hole verticality measurement H. Fig.11 It is a schematic diagram of the tower body being placed between the first platform and the second platform in the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1 to 11 As shown, a method for disassembling and assembling a crane tower body comprises the following specific steps: S0 Before lifting the tower body, remove the internal components of the tower body to avoid damage to the internal components of the tower body.

[0035] S1 Select two lifting points on the tower body, and use the crane to lift the tower body to the shelving station. The shelving station is to place the lower part of the tower body so that the flange surface of the lower part of the tower body is exposed. For example, the frame is provided with a hollow hole at the upper end. The size of the hollow hole matches the maximum area of ​​the threaded hole set on the flange surface of the lower tower body. Then install the detection device on the screw hole of the flange surface a5, and perform verticality detection on the screw hole a6 on the flange surface a5 in turn, including S1.1~S1.5, S1.1 When the depth of the screw hole a6 on the flange surface a5 is set to H, the maximum allowable offset of the corresponding screw hole a6 is K. Then calculate the verticality of the screw hole corresponding to the depth of the screw hole a6 on the flange surface a5 is set to H. , screw hole verticality The calculation formula is as follows: ; S1.2 Place the detection ring on the flange surface a5, align the central through hole a44 provided on the inner ring body a41 of the detection ring with the screw hole a6 on the flange surface, and then pass the lower end of the positioning rod a1 through the central through hole a44 and threadedly connect it with the screw hole a6. When the lower end of the positioning rod a1 enters the screw hole a6 to a depth of H, stop the rotation of the positioning rod a1, and fix the detection ring on the flange surface a5 by the fixing member a9; S1.3 Sleeve the rotating rod a2 on the upper end of the positioning rod, then sleeve the limiter a11 on the upper end of the positioning rod a1 to limit the rotating rod a2, and then install the dial indicator a3 on the end of the rotating rod a2 away from the positioning rod a1 through the locking member, so that the dial indicator a3 is located above the outer ring body a42 of the detection ring, and the pointer of the dial indicator a3 abuts against the upper end surface area a45 of the outer ring body a42 of the detection ring; S1.4 In this embodiment, the rotating rod is first rotated 360° clockwise to drive the dial indicator a3 to rotate 360° clockwise around the positioning rod a1 in the upper end surface area 45 of the outer ring body a42 of the detection ring, and the maximum value B of the dial indicator a3 during the clockwise rotation process is recorded. max1 and minimum value B min1 Then rotate the rotating rod 360° counterclockwise, drive the dial indicator 3 to rotate 360° counterclockwise around the positioning rod a1 in the upper end surface area a45 of the outer ring body a42 of the detection ring, and record the maximum value B of the dial indicator a3 during the counterclockwise rotation process. max2 and minimum value B min2 , then the maximum value B max1 and the maximum value B max2 The larger value of the two is taken as the maximum value B of the dial indicator a3 value during the rotation process max , the minimum value B min1 and minimum value B min2 The smaller value of the two is taken as the minimum value B of the dial indicator a3 value during the rotation process min By rotating the rotating rod in different directions, the dial indicator can obtain two sets of data. After comparing the two sets of data, more accurate data can be obtained to avoid inaccurate data due to accidental factors. At the same time, the minimum value B is recorded. min The position of the rotating rod a2 at this time, the direction of the rotating rod a2 is the deflection direction of the screw hole; S1.5 Calculate the maximum value B max With minimum value B min The difference between B, The calculation formula of B is as follows: , 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 according to the verticality in step S1 Calculate the theoretical difference of the verticality of the screw hole detected by the dial indicator B', theoretical difference The calculation formula of B' is as follows: , Then compare B and B', enter step S1.5.1~S1.5.2, determine whether the verticality of screw hole a6 meets the requirements, S1.5.1 If B is less than or equal to B', it is judged that the verticality of the flange surface screw hole a6 meets the requirements; S1.5.2 If B is greater than B', it is judged that the verticality of the flange surface screw hole a6 does not meet the requirements; After inspecting all the screw holes a6 on the flange surface a5, if the number of screw holes meeting the verticality requirement is less than or equal to the preset number, proceed to step S2. In this embodiment, the preset number of screw holes meeting the verticality requirement is three quarters of all the screw holes on the flange surface.

[0036] S2 determines the position of the sealing plate 4 on the inner side of the tower body, then marks the position corresponding to the sealing plate 4 on the outer side 31 of the tower body, and determines the cutting area 33 on the outer side 31 of the tower body, and then cuts off the sealing plate 4 on the inner side of the tower body, including S2.1~S2.5, S2.1 Measure the distance from the upper end surface 41 to the lower end surface 42 of the sealing plate 4 in the tower body, and then measure the distance from the lower end surface 42 of the sealing plate to the upper end surface 211 of the bottom plate 21 of the lower part 2 of the tower body; S2.2 horizontally set the marking line 11 and the marking line 2 12 on the outer side surface 31 of the tower body, so that the distance from the marking line 11 in the direction perpendicular to the bottom plate 21 of the lower part 2 of the tower body to the upper end surface 211 of 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 2 12 in the direction perpendicular to the bottom plate 21 of the lower part 2 of the tower body to the marking line 11 is equal to the distance from the upper end surface 41 to the lower end surface 42 of the sealing plate 4; S2.3 The center line 5 is horizontally arranged between the marked line 1 11 and the marked line 2 12, so that the vertical distance from the marked line 1 11 to the center line 5 is equal to the vertical distance from the marked line 2 12 to the center line 5, and then the marked line 3 13 is horizontally arranged within a range from one quarter of the distance from the marked line 1 11 to the center line 5 to one half of the distance from the marked line 1 11 to the center line 5, and the marked line 4 14 is horizontally arranged within a range from one quarter of the distance from the marked line 2 12 to the center line 5 to one half of the distance from the marked line 2 12 to the center line 5. In this embodiment, the marked line 1 11, the marked line 2 12, the marked line 3 13, the marked line 4 14 and the center line 5 on the same outer side surface 31 of the upper part of the tower body are arranged parallel to each other; S2.4 determining that the area between the marked line 3 13 and the marked line 4 14 is the cutting area 33. In this embodiment, the distance between the marked line 3 13 and the center line 5 is equal to one quarter of the distance between the marked line 1 11 and the center line 5, and the distance between the marked line 4 14 and the center line 5 is equal to one quarter of the distance between the marked line 2 12 and the center line 5; S2.5 A clamping plate 6 is welded to the lower end of the sealing plate 4 so that the clamping plate 6 is connected to the sealing plate 4 to form a whole and support the sealing plate 4. Then, a cutting end face 43 is determined on the sealing plate 4. In this embodiment, taking the inner side surface 32 of the tower body as a reference, a marking line six (not marked in the figure) is horizontally set at a position extending 10 mm in 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. Gas cutting is performed along the cutting end face 43 so that after the sealing plate 4 is cut, a root 7 is formed between the cutting end face 43 and the inner side surface 32 of the tower body, that is, the thickness of the root 7 is 10 mm. This can effectively prevent the inner side surface 32 of the upper part 8 of the tower body from being damaged during the gas cutting process. After cutting, the clamping plate 6 and the sealing plate 4 are removed.

[0037] S3 uses a crane to lift the pier 1 to the splitting station, then selects two lifting points on the tower body and fixes the wire ropes on the lifting points, and pulls the wire ropes by the crane to lift the tower body to the top of the pier 1 in an upright 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, the crane is controlled to make the wire rope in a straight state, and then more than two stop plates 3 are welded between the pier 1 and the lower part 2 of the tower body, so as to fix the tower body to the splitting station. In this embodiment, four stop plates 3 are provided, and the four stop plates 3 are welded on the outer side of the lower part 2 of the tower body in a circular distribution, so as to stably fix the lower part 2 of the tower body to the pier. On the platform 1, then hoist the two gantry z2 to one side of the lower part 2 of the tower body, adjust the height of the gantry z2, so that the height of the gantry z2 matches the height of the cutting area 33, and at the same time, make the distance from the gantry z2 to the cutting area 33 match the distance required by the staff when working, and then hoist the two gantry z1 to the other side of the lower part 2 of the tower body, adjust the height of the gantry z1, so that the height of the gantry z1 matches the height of the cutting area 33, and at the same time, make the distance from the gantry z1 to the cutting area 33 match the distance required by the staff when working, and make the two gantry z1s aligned with the two gantry z2s in the direction of the horizontal line and in the direction perpendicular to the horizontal line respectively.

[0038] S4 Weld the fixing member 9 on the outer side 31 of the upper part 8 of the tower body above the cutting area 33 through the stand 1 z1 and the stand 2 z2. In this embodiment, the fixing member 9 is located 20 mm above the cutting area. The fixing member 9 is welded to the outer side 31 of the upper part 8 of the tower body in sequence around the upper part 8 of the tower body. Then, the fixing members 9 are welded between each other so that the fixing members on the outer side 31 of the upper part 8 of the tower body are integrally fixed to the outer side 31 of the upper part 8 of the tower body. Then, the round carbon rod and the flat carbon rod are used to respectively surround the tower body clockwise in the cutting area 33 of the outer side 31 of the tower body for carbon planing cutting. After the cutting is completed, the stand z1 and the stand z2 are respectively lifted away from the outside of the tower body, and then the upper part 8 of the tower body is lifted away from the lower part 2 of the tower body in the vertical direction, and then it is left to stand for a period of time, and the carbon planer cutting end of the upper part 8 of the tower body is observed to be qualified. If qualified, the upper part 8 of the tower body is lifted to the storage station by a crane to remove the fixing part 9, and a groove is opened at the carbon planer cutting end; if unqualified, enter step S5. In this embodiment, the wind pressure range of the round carbon rod and the flat carbon rod is 0.4-0.6MPa, the current range is 400-450A, and the fixing part 9 is a channel steel.

[0039] S5: A marking line 5 15 is horizontally set within a range of 500-600 mm from the carbon planer cutting surface 81 on the outer side surface 31 of the upper tower body 8, and carbon planer cutting is performed at the marking line 5 15. In this embodiment, the vertical distance between the marking line 5 15 and the carbon planer cutting surface 81 is 600 mm. A groove is opened after cutting. Taking the carbon planer cutting surface 81 as a reference, a groove 10 is opened outwardly at the carbon planer cutting end of the upper tower body 8, so that the groove inclined surface 111 and the carbon planer cutting surface 81 are inclined, and the inclination angle between the groove inclined surface 111 and the carbon planer cutting surface 81 is 40°-60°. In this embodiment, the inclination angle a between the groove inclined surface 111 and the carbon planer cutting surface 81 is 45°. By opening the groove 10, it is convenient to connect the upper tower body 8 with other lower tower bodies, realize the recycling of the upper tower body 8, and save costs.

[0040] S6 installs the lower part of the tower body to be connected on the rotating platform, and hoists the upper part of the tower body with the groove to the lower part of the tower body to be connected for welding. Specifically, the tower body can be installed on the rotating platform by moving the two gantry twos to one side of the lower part of the tower body to be connected, and making the height of the gantry two at the height of the upper end of the tower body to be connected, and then hoisting the two gantry one to the other side of the lower part of the tower body to be connected, and making the height of the gantry one at the height of the upper end of the tower body to be connected, and then the upper part of the tower body 8 with the groove and the lower part of the tower body to be connected are welded by the two gantry one and the two gantry two.

[0041] The working principle of the present invention is as follows: before installing the tower body, the verticality of the screw holes on the flange surface at the bottom of the tower body is first detected. After the detection, if the verticality of more screw holes does not meet the requirements, then 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 can be determined, and the cutting area is determined, and then the sealing plate on the inner side of the tower body is cut off, and the tower body is hoisted to the disassembly station and welded to the pier to form a whole, and the stand one and the stand two are hoisted to the outside of the tower body respectively, so that the staff can cut the cutting area on the stand one and the stand two. After the cutting is completed, the stand one and the stand two are hoisted away from the outside of the tower body respectively, and the upper part of the tower body is hoisted away from the lower part 2 of the tower body in the vertical direction to realize the separation of the upper and lower parts of the tower body, thereby retaining the upper part 8 of the tower body, and realizing the recycling of the upper part of the tower body. The method is reliable.

Claims

1. A method for disassembling and assembling a crane tower, characterized in that: The following steps are involved: S1: The tower body is hoisted to the storage station, and the flange surface of the lower part of the tower body is exposed. Then, the detection device is installed on the screw hole of the flange surface. The positioning rod of the detection device is set in the screw hole, and the rotating rod is set on the positioning rod. A dial indicator is set on the other end of the rotating rod. The dial indicator is rotated by the rotating rod to measure whether the value is within the preset deviation range of the screw hole to perform verticality detection on the screw hole on the flange surface. If the number of screw holes that meet the verticality requirements is less than or equal to the preset number, enter step S2; S2 determines the position of the sealing plate inside the tower body, then marks the position corresponding to the sealing plate on the outer side of the tower body, determines the cutting area on the outer side of the tower body, and then cuts off the sealing plate inside the tower body; S3: The tower body is hoisted to the splitting station for fixing, and two racks 1 and two racks 2 are respectively arranged on both sides of the lower part of the tower body; S4: welding fixings on the outer side of the upper part of the tower body above the cutting area by using the first and second stands, and then performing carbon planing cutting on the cutting area of ​​the outer side of the tower body. After the cutting is completed, the first and second stands are respectively lifted off the outer side of the tower body, and then the upper part of the tower body is lifted off the lower part of the tower body in the vertical direction, and observing whether the cut end of the upper part of the tower body is qualified. If qualified, a groove is opened at the cut end; if unqualified, entering step S5; S5. A marking line 5 is horizontally set on the outer surface of the upper part of the tower body within a preset range from the carbon planer cutting surface, and carbon planer cutting is performed at the marking line 5, and a groove is opened after cutting; S6 installs the lower part of the tower body to be connected on the rotating platform, and hoists the upper part of the tower body with a groove to the lower part of the tower body to be connected for welding to achieve the installation of the tower body on the rotating platform.

2. A crane tower disassembly and assembly method according to claim 1, characterized in that: The method further comprises step S0: before lifting the tower body, removing components inside the tower body.

3. A crane tower disassembly and assembly method according to claim 1, characterized in that: The step S1 for detecting the verticality of the screw hole includes S1.1 to S1.

5. S1.1 When the depth of the screw hole on the flange surface is preset to H, the corresponding maximum allowable offset of the screw hole is K, and then the verticality of the screw hole corresponding to the depth of the screw hole on the flange surface is calculated. , screw hole verticality The calculation formula is as follows: ； S1.2 Place the detection ring on the flange surface, align the central through hole set on the inner ring body of the detection ring with the screw hole on the flange surface, and then pass the lower end of the positioning rod through the central through hole and thread it into the screw hole. When the lower end of the positioning rod enters the screw hole to a depth of H, stop the rotation of the positioning rod and fix the detection ring on the flange surface with the fixing parts; S1.3 Sleeve the rotating rod on the upper end of the positioning rod, then sleeve the limit piece on the upper end of the positioning rod to limit the rotating rod, and then install the dial indicator on the end of the rotating rod away from the positioning rod through the locking piece, so that the dial indicator is located above the outer ring body of the detection ring; S1.4 Rotate the rotating rod, and then drive the dial indicator to rotate and 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 in the dial indicator value max , minimum value B min and the minimum value B min The position of the rotating rod when S1.5 Calculate the maximum value B max With minimum value B min The difference between B, The calculation formula of B is as follows: ， Then measure the distance d2 from the center of the mounting hole on the rotating rod to the vertical axis of the positioning rod, and according to the verticality in step S1 Calculate the theoretical difference of the verticality of the screw hole detected by the dial indicator B', theoretical difference The calculation formula of B' is as follows: ， Compare B and B', and then determine whether the verticality of the screw hole meets the requirements.

4. A crane tower disassembly and assembly method according to claim 1, characterized in that: The step S2 also includes S2.1 to S2.5, S2.1 Measure the distance from the upper end face to the lower end face of the sealing plate inside the tower body, and then measure the distance from the lower end face of the sealing plate to the upper end face of the bottom plate at the bottom of the tower body; S2.2 Marking line 1 and marking line 2 are horizontally set on the outer side of the tower body, so that the distance from marking line 1 to the upper end face of the lower bottom plate of the tower body is equal to the distance from the lower end face of the cover plate to the upper end face of the lower bottom plate of the tower body, and the distance from marking line 2 to marking line 1 is equal to the distance from the upper end face of the cover plate to the lower end face; S2.3 Set the center line horizontally between the first and second dimension lines, so that the distance from the first dimension line to the center line is equal to the distance from the second dimension line to the center line. Then, based on the center line, set the third dimension line horizontally within a range from one quarter of the distance from the first dimension line to one half of the distance from the first dimension line to the center line, and set the fourth dimension line horizontally within a range from one quarter of the distance from the second dimension line to one half of the distance from the second dimension line to the center line. S2.4 determine the area between the marked line 3 and the marked line 4 as the cutting area; S2.5 Weld a clamping plate at the lower end of the sealing plate so that the clamping plate and the sealing plate are connected to form a whole, then determine the cutting end face on the sealing plate, and cut the sealing plate along the cutting end face so that after the sealing plate is cut, a root is formed between the cutting end face and the inner side of the tower body, and remove the clamping plate and the sealing plate after cutting.

5. A crane tower disassembly and assembly method according to claim 1, characterized in that: The step S3 also includes: Adjust the height of the second platform to match the height of the second platform with the height of the cutting area, and at the same time, match the distance from the second platform to the cutting area with the distance required by the staff when working; The height of the platform 1 is adjusted to match the height of the platform 1 with the height of the cutting area, and the distance from the platform 1 to the cutting area matches the distance required by the staff during operation.

6. A crane tower disassembly and assembly method according to claim 1, characterized in that: The step S3 also includes: Select two lifting points on the tower body, then fix the wire rope on the lifting points, lift the tower body to the top of the pier by the crane, and keep the wire rope in a straight state after the flange surface of the lower bottom plate of the tower body abuts against the pier; then lift the two gantry twos to one side of the lower part of the tower body, adjust the height of gantry two, and then lift the two gantry ones to the other side of the lower part of the tower body, adjust the height of gantry one, and align the two gantry ones with the two gantry twos in the direction of the horizontal line and in the direction perpendicular to the horizontal line respectively.

7. A crane tower disassembly and assembly method according to claim 1, characterized in that: The step S4 also includes: The fixing parts are welded to the outer side of the upper part of the tower body in sequence around the upper part of the tower body, and then the fixing parts are welded between each other so that the fixing parts on the outer side of the upper part of the tower body are integrally fixed to the outer side of the upper part of the tower body, and then a round carbon rod and a flat carbon rod are used in the cutting area of ​​the outer side of the tower body to carry out carbon planing cutting around the tower body clockwise.

8. A crane tower disassembly and assembly method according to claim 1, characterized in that: The step S5 further comprises: Taking the carbon planer cutting surface as a reference, a groove is opened outward at the carbon planer cutting end of the upper part of the tower body, so that the groove slope is inclined to the carbon planer cutting surface, and the inclination angle between the groove slope and the carbon planer cutting surface is 40°~60°.

9. A crane tower disassembly and assembly method according to claim 3, characterized in that: In step S1.5, the comparison B and B', also includes S1.5.1~ S1.5.2, S1.5.1 If B is less than or equal to B', it is judged that the verticality of the screw hole on the flange surface meets the requirements; S1.5.2 If B is greater than B', it is judged that the verticality of the screw hole on the flange surface does not meet the requirements.

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