A double-tower crane dismounting construction method for a steel structure cooling tower with built-in skin

Abstract

The application relates to a double-tower crane dismounting construction method of a skin-embedded steel structure cooling tower, which balances counterweight blocks by dismounting two tower cranes from each other and dismounts tower arms from each other, so that the tower cranes can be dismounted in a narrow area of the cooling tower without the aid of external large equipment in high altitude, and the dismounting of attachment rods is completed by a vice crane and a moving mechanism. The attachment rods are dismounted by the moving mechanism and the vice crane, the vice crane is arranged on a climbing frame, the difference in height is small when the attachment rods are lifted, and the swinging range is small, the vice crane is moved to below the tower arm through the moving mechanism, is connected through a lifting hook on the tower arm, the lifting hook completes large-difference lifting and placing of the attachment rods, the lifting hook can travel to a position far away from a standard section and then is placed, so that the standard section is not impacted even if swinging occurs.

Description

Technical Field

[0001] This invention belongs to the field of tower crane construction technology, specifically relating to a method for dismantling and constructing a twin-tower cooling tower with an internally mounted steel structure. Background Technology

[0002] Tower cranes are common high-altitude lifting devices on construction sites. A tower crane is assembled from multiple standard sections. After the building is raised, the climbing frame in the tower crane climbs along the standard sections, and then new standard sections are lifted to add to increase the height. When the standard section reaches a certain height, an attachment rod is installed between the standard section and the building for lateral reinforcement. The same principle applies during dismantling. However, for buildings in narrow spaces, the tower crane may have limited rotation after the tower arm is lower than the building height during the gradual dismantling of the standard sections, making it difficult to rotate freely for self-dismantling.

[0003] In response, Chinese invention patent application number 202010303646.2 discloses a method for dismantling a tower crane in a narrow space. This method involves eccentrically placing two tower cranes, A and B, inside a cooling tower to shorten each other. When the tower arm length is no longer obstructed by the cooling tower, the standard section begins to dismantle itself. When dismantling reaches the attachment rod, since the tower arm cannot rotate, the attachment rod cannot be dismantled automatically. Therefore, a ground winch with a fixed pulley is used to lower the attachment rod to the ground. This method has the following drawbacks: because the tower crane is nearly 200 meters high, the height difference between some of the attachment rods at higher points and the ground is significant. Lowering them using a winch results in a long suspended cable that is prone to swaying during descent. Furthermore, the attachment rods are too close to the standard section of the tower crane, making them prone to collisions. Summary of the Invention

[0004] The purpose of this invention is to provide a method for dismantling and constructing a twin-tower cooling tower with an internally mounted steel structure to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A method for dismantling a twin-tower cooling tower with an internally mounted steel structure includes the following steps:

[0007] S1: Add standard sections to tower crane A so that the tower arm of tower crane A is higher than that of tower crane B, and shorten the tower arm of tower crane B by dismantling tower crane A.

[0008] S2: Remove the standard section of tower crane A so that the tower jib height of tower crane A is lower than that of tower crane B, and then remove the short tower jib of tower crane A through tower crane B;

[0009] S3: Tower cranes A and B each remove their own standard sections;

[0010] S4: When encountering an attachment rod on a standard section, the attachment rod is lifted by the auxiliary crane set on the climbing frame. The auxiliary crane is rotated along the climbing frame by the moving mechanism, so that the attachment rod is moved to the bottom of the tower arm. The hook in the tower arm connects and takes over from the auxiliary crane to lift the attachment rod. Then the hook moves the attachment rod to a position away from the standard section for lowering.

[0011] As a further optimization of the present invention, the auxiliary crane includes a boom, an auxiliary lifting rope with a winding device, and an auxiliary hook at the end of the auxiliary lifting rope. The auxiliary crane is existing technology. The attachment rod can be removed by lifting the attachment rod with the auxiliary crane and then removing the fixing parts at both ends of the attachment rod.

[0012] As a further optimization of the present invention, the attachment rod is fixed by a binding rope. The two ends of the binding rope are fixed to the attachment rod respectively. The middle section of the binding rope is provided with two parallel hanging knots. The middle part of the hanging knot is provided with a metal hook. Since it is difficult to connect the hook when changing it at high altitude, parallel hanging knots are provided in the binding rope. Since the binding rope is stretched and forms a triangular area after being stressed, the triangular area is relatively large and facilitates connection.

[0013] As a further optimization of the present invention, the end of the boom is provided with an internal threaded cylinder, the auxiliary lifting rope passes through the internal threaded cylinder, and the surface of the auxiliary lifting rope is provided with an external threaded component. The surfaces of the internal threaded cylinder and the external threaded component are provided with matching wide-pitch threads, so that the external threaded component can rotate when pulled into the internal threaded cylinder by the auxiliary lifting rope. During docking, the hook can only be switched by moving horizontally on the boom. Therefore, in order to make the above-mentioned triangular area face the hook, a threaded structure is provided so that the auxiliary hook can rotate when the auxiliary lifting rope is tightened. The thread is a wide-pitch thread so that the amount of rotation is easier to control.

[0014] As a further optimization of the present invention, the hook head is provided with an extension, which is used to guide the hook into the binding rope to connect with the sub-sling knot. When the hook moves horizontally along the tower arm, its hook head enters the above-mentioned triangular area through the extension. Then, after the hook is lifted, it tightens another sub-sling knot. After being pulled up, the auxiliary hook disengages from its corresponding sub-sling knot, and the attachment rod can be lowered through the tower arm and the hook.

[0015] As a further optimization of the present invention, the moving mechanism includes at least two track sections arranged on the climbing frame. The track sections are an outer track and an inner track. The auxiliary crane is connected to the track sections through a moving seat. The surface of the moving seat is provided with a driving part and a driving wheel driven by the driving part to move along the track section. Since the climbing frame is a frame type and has a square cross-section, in order to enable the moving mechanism to drive the auxiliary crane to rotate and move below the hook, this solution provides two track sections and two tracks on each track section, and moves by driving part.

[0016] As a further optimization of the present invention, the drive wheel is a gear, and the inner and outer tracks are provided with meshing tooth grooves on the surfaces of the drive wheel that are subjected to force. The drive method of meshing gears and tooth grooves is more stable and reliable, and the drive part can self-lock, so that the gears of the inner and outer grooves lock the moving seat to prevent shaking.

[0017] As a further optimization of the present invention, the shaft portion of the gear is also provided with a limiting wheel, and the track portion has a guide groove corresponding to the limiting wheel to prevent the gear from disengaging from the tooth groove.

[0018] As a further optimization of the present invention, the inner track is fixed to the outside of the climbing frame by mechanical connection, and the outer track is connected to the inner track by connecting ribs. The corner of the inner track is a right angle bend, and the corner of the outer track is a rounded chamfer bend. The drive wheels of the inner track and the outer track rotate synchronously, which drives the moving seat to translate. When turning, the drive wheel of the inner track stops, while the drive wheel of the outer track moves upward with the rounded chamfer bend to complete the turning.

[0019] As a further optimization of the present invention, the drive unit includes a motor and a worm / worm gear reduction device. The worm / worm gear reduction connection structure is the prior art. The motor drives the worm to rotate the worm to increase the torque. Conversely, when the motor stops driving, the threaded self-locking structure prevents the worm gear from driving the worm to rotate in the opposite direction, so that the drive wheel stops, i.e., self-locks.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention removes the attachment rod by setting up a moving mechanism and an auxiliary crane. The auxiliary crane is set on the climbing frame. When lifting the attachment rod, the drop is small and the swaying amplitude is small. The auxiliary crane is moved to the bottom of the tower arm by the moving mechanism and docked with the hook on the tower arm. This allows the hook to complete the large drop of the attachment rod. The hook can travel along the tower arm to a position away from the standard section before being lowered. Therefore, even if swaying occurs, it will not collide with the standard section. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is the invention Figure 1 Enlarged view of the structure of section A in the middle;

[0024] Figure 3 This is the invention Figure 2 BB-direction view;

[0025] Figure 4 This is the invention Figure 3 Schematic diagram showing the separation of the mobile mechanism from the climbing frame;

[0026] Figure 5 This is the invention Figure 3 A schematic diagram showing the moving mechanism under the hook;

[0027] Figure 6 This is the invention Figure 2 Enlarged view of the structure of section C;

[0028] Figure 7 This is the invention Figure 2 Enlarged view of the structure of section D in the middle;

[0029] Figure 8 This is the invention Figure 2 EE-oriented view;

[0030] Figure 9 This is a schematic diagram of the predetermined position when the twin tower crane is dismantled.

[0031] In the diagram: 1. Tower crane; 11. Tower arm; 12. Hook; 13. Standard section; 14. Climbing frame; 15. Attachment rod; 2. Moving mechanism; 21. Inner rail; 22. Outer rail; 23. Connecting rib; 24. Moving seat; 25. Drive unit; 26. Drive wheel; 27. Limit wheel; 3. Auxiliary crane; 31. Boom; 32. Winch; 33. Internal threaded cylinder; 34. Auxiliary lifting rope; 35. External threaded component; 36. Auxiliary hook; 37. Binding rope; 38. Split lifting knot; 39. Butt hook. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0033] Example 1

[0034] like Figure 1-8 As shown, a method for dismantling a twin-tower cooling tower with an internally mounted steel structure includes the following steps:

[0035] S1: Add standard section 13 to tower crane A 1 so that the tower arm 11 of tower crane A is higher than the tower arm 11 of tower crane B 1. Remove the counterweight of tower crane B 1 from tower crane A 1. Calculate the balance conditions of each tower crane 1 before removal. Shorten the tower arm 11 of tower crane B 1 from tower crane A 1. Shorten the length of the tower arm 11 of tower crane B 1 so that it can descend along the inside of the cooling tower.

[0036] S2: Remove the standard section 13 of tower crane 1 A, so that the height of tower arm 11 of tower crane 1 A is lower than that of tower crane 1 B. Remove the counterweight of tower crane 1 A through tower crane 1 B, and shorten tower arm 11 of tower crane 1 A, so that the length of tower arm 11 of tower crane 1 A is shortened to be able to descend along the inside of the cooling tower.

[0037] S3: Tower cranes A and B 1 rotate to their respective predetermined positions. The predetermined positions prevent the cooling tower from interfering with the tower arm 11 when tower crane 1 descends. Tower cranes A and B 1 each remove their own standard sections 13 and descend to the desired height.

[0038] S4: The auxiliary crane 3 installed on the climbing frame 14 lifts the attachment rod 15. The auxiliary crane 3 is rotated along the climbing frame 14 by the moving mechanism 2, so that the attachment rod 15 moves to the bottom of the tower arm 11. The hook 12 in the tower arm 11 connects and takes over from the auxiliary crane 3 to lift the attachment rod 15. Then the hook 12 moves the attachment rod 15 to a position away from the standard section 13 for lowering.

[0039] In this scheme, the attachment rod is removed by setting up a moving mechanism 2 and an auxiliary crane 3. The auxiliary crane 3 is set on the climbing frame 14. When it lifts the attachment rod 15, the drop is small, so it will not sway or the swaying amplitude is small. The auxiliary crane 3 is moved to the bottom of the tower arm 11 by the moving mechanism 2 and docked with the hook 12 on the tower arm 11. The hook 12 completes the large drop of the attachment rod 15. The hook 12 can travel along the tower arm 11 to a position away from the standard section 13 before being lowered. Therefore, even if swaying occurs, it will not collide with the standard section 13.

[0040] The auxiliary crane 3 includes a boom 31, an auxiliary lifting rope 34 with a winding device, and an auxiliary hook 36 at the end of the auxiliary lifting rope 34. The auxiliary crane 3 is existing technology. The auxiliary crane 3 lifts the attachment rod 15, and then the fixing parts at both ends of the attachment rod 15 are removed to remove the attachment rod 15. The attachment rod 15 is fixed by a binding rope 37. The two ends of the binding rope 37 are fixed to the attachment rod 15 respectively. The middle section of the binding rope 37 is provided with two parallel sub-knots 38. The middle part of the sub-knots 38 is provided with a metal docking hook 39. Since it is difficult to dock the hook 12 at high altitude, parallel sub-knots 38 are provided in the binding rope 37. When the binding rope 37 is stressed, it forms a triangular area. This triangular area is relatively large and facilitates docking.

[0041] Furthermore, an internally threaded cylinder 33 is provided at the end of the boom 31, and an auxiliary lifting rope 34 passes through the internally threaded cylinder 33. The surface of the auxiliary lifting rope 34 is provided with an externally threaded part 35. The surfaces of the internally threaded cylinder 33 and the externally threaded part 35 are provided with matching wide-pitch threads so that the externally threaded part 35 can rotate when pulled into the internally threaded cylinder 33 by the auxiliary lifting rope. During docking, the hook 12 can only be switched by moving horizontally on the boom 11. Therefore, in order to make the above-mentioned triangular area face the hook 12, a threaded structure is provided so that the auxiliary hook 36 can rotate when the auxiliary lifting rope 34 is tightened. The thread is a wide-pitch thread so that the amount of rotation is easier to control.

[0042] The hook head of the hook 12 is provided with an extension, which is used to guide the hook 12 into the binding rope 37 to connect with the sub-sling knot 38. When the hook 12 moves horizontally along the tower arm 11, its hook head enters the triangular area through the extension. Then, after the hook 12 is lifted, it tightens another sub-sling knot 38. After being pulled up, the auxiliary hook 36 disengages from its corresponding sub-sling knot 38, and the attachment rod 15 can be lowered through the tower arm 11 and the hook 12.

[0043] The moving mechanism 2 includes at least two track sections mounted on the climbing frame 14. The track sections are an outer track 22 and an inner track 21. The auxiliary crane 3 is connected to the track sections via a moving seat 24. The surface of the moving seat 24 is provided with a driving part 25 and a driving wheel 26 driven by the driving part 25 to move along the track sections. Since the climbing frame 14 is a frame type with a square cross section, in order for the moving mechanism 2 to drive the auxiliary crane 3 to rotate and move below the hook 12, this solution provides two track sections and two tracks on each track section, which are driven by the driving part 25 to move.

[0044] Specifically, the drive wheel 26 is a gear, and the inner track 21 and outer track 22 have meshing tooth grooves on the surfaces of the drive wheel 26 that bear force, such as... Figure 6 From this perspective, the two upper drive wheels 26 are stressed on the right side of the track, hence the tooth grooves are located on the right side of the track. The two lower drive wheels 26 are stressed on the left side of the track, hence the tooth grooves are located on the left side of the track. This gear-and-tooth meshing drive system is more stable and reliable. Furthermore, the drive unit can self-lock, locking the gears of the inner and outer tracks to the moving seat 24 to prevent wobbling. Figure 6 As shown, the gears in the inner and outer tracks can prevent left and right swaying after locking, while the upper and lower track sections are used to increase the load-bearing capacity of the boom 31. In order to increase the load-bearing capacity of the boom 31, a winch 32 can also be installed on the moving base 24. The boom 31 is hinged to the moving base 24. The winch 32 is used to pull up the boom 31 and can also adjust the angle of the boom 31.

[0045] The shaft of the gear is also rotatably provided with a limiting wheel 27, and the track has a guide groove corresponding to the limiting wheel 27 to prevent the gear from disengaging from the tooth groove.

[0046] The inner rail 21 is mechanically fixed to the outside of the climbing frame 14. The outer rail 22 is connected to the inner rail 21 through the connecting rib 23. The corner of the inner rail 21 is a right angle bend, and the corner of the outer rail 22 is a rounded chamfer bend. The drive wheels 26 of the inner rail 21 and the outer rail 22 rotate synchronously, which drives the moving seat 24 to translate. When turning, the drive wheel 26 of the inner rail 21 stops, while the drive wheel 26 of the outer rail 22 moves on the rounded chamfer bend to complete the turning of the moving seat 24.

[0047] The drive unit 25 includes a motor and a worm / worm gear reduction device. The worm / worm gear reduction connection structure is existing technology. The motor drives the worm to rotate the worm to increase the torque. Conversely, when the motor stops driving, the threaded self-locking structure prevents the worm gear from driving the worm to rotate in the opposite direction, so that the drive wheel stops and the self-locking is completed.

[0048] The specific implementation method is as follows: First, steps S1-S4 are performed. Once the length of the tower arm 11 is shortened enough to descend into the cooling tower, then... Figure 9 As shown, since the two tower cranes 1 need to be disassembled, the length cannot be shortened indefinitely; it can only be shortened to the length shown. Figure 9 The tower arm 11 can be in the state of disassembly and assembly. At this time, the tower arm 11 cannot rotate, and the climbing component 14 has an entrance for disassembling and assembling the standard section 13. The orientation of this entrance must be preset when the tower crane 1 is erected so that the orientation of the entrance is consistent with the orientation of the tower arm 11 when the standard section 13 is disassembled.

[0049] During the self-dismantling of standard section 13, when encountering attachment rod 15, the attachment rod 15 is lifted by auxiliary crane 3, and then the auxiliary crane 3 is moved to directly below the area covered by hook 12 by moving mechanism 2. Specifically, this is driven by drive unit 25 on inner and outer rails 21 to achieve the following: Figure 5 As shown, the direction of the binding rope 37 is controlled by the degree to which the external threaded part 35 enters the internal threaded cylinder 33, so that the triangular area formed by the binding rope 37 is perpendicular to the path direction of the hook 12. The hook 12 is translated so that the extension on the hook 12 enters the triangular area. After the hook 12 is lifted, the extension hooks the free sub-hook 38. As the hook 12 continues to be lifted, the secondary hook 36 disengages from the sub-hook 38 on it. The hook 12 translates the attachment rod 15 and then falls to the ground.

[0050] After the attachment rod 15 is removed, continue to remove the standard section 13 until all the attachment rods 15 are removed. Then, remove the remaining few standard sections 13, climbing frame 14, tower arm 11, auxiliary crane 3, and moving mechanism 2 using a ground crane.

[0051] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for dismantling and constructing a twin-tower cooling tower with an internally mounted steel structure, characterized in that: Includes the following steps: S1: Add a standard section (13) to tower crane A (1) so that the tower arm (11) of tower crane A is higher than the tower arm (11) of tower crane B (1). By shortening the tower arm (11) of tower crane B (1) through tower crane A (1), the length of the tower arm (11) of tower crane B (1) is shortened to be able to descend along the inside of the cooling tower. S2: Remove the standard section (13) of tower crane A (1) so that the height of the tower arm (11) of tower crane A (1) is lower than that of tower crane B (1). By shortening the tower arm (11) of tower crane A (1) through tower crane B (1), the length of the tower arm (11) of tower crane A (1) is shortened to be able to descend along the inside of the cooling tower. S3: Tower cranes A and B (1) each dismantle their own standard section (13); S4: When encountering an attachment rod (15) on a standard section (13), the attachment rod (15) is lifted by the auxiliary crane (3) set on the climbing frame (14). The auxiliary crane (3) is rotated along the climbing frame (14) by the moving mechanism (2) so that the attachment rod (15) is moved to the bottom of the tower arm (11). The hook (12) in the tower arm (11) is connected and takes over from the auxiliary crane (3) to lift the attachment rod (15). Then the hook (12) moves the attachment rod (15) to a position away from the standard section (13) for lowering. The auxiliary crane (3) includes a boom (31), an auxiliary hoisting rope (34) with a winding device, and an auxiliary hook (36) at the end of the auxiliary hoisting rope (34). The attachment rod (15) is fixed by a binding rope (37). The two ends of the binding rope (37) are fixed to the attachment rod (15) respectively. The middle section of the binding rope (37) is provided with two parallel hanging knots (38). The middle part of the hanging knot (38) is provided with a metal part hook (39).

2. The dismantling and construction method for a twin-tower cooling tower with an internally mounted steel structure according to claim 1, characterized in that: The end of the boom (31) is provided with an internal threaded cylinder (33), and the auxiliary lifting rope (34) passes through the internal threaded cylinder (33). The surface of the auxiliary lifting rope (34) is provided with an external threaded part (35). The surfaces of the internal threaded cylinder (33) and the external threaded part (35) are provided with matching wide-pitch threads so that the external threaded part (35) rotates when it is pulled into the internal threaded cylinder (33) by the auxiliary lifting rope (34).

3. The method for dismantling and constructing a twin-tower cooling tower with an internally mounted steel structure according to claim 1, characterized in that: The hook (12) has an extension at the hook head, which is used to guide the hook (12) into the binding rope (37) to connect with the sub-knot (38).

4. The dismantling and construction method for a twin-tower cooling tower with an internally mounted steel structure according to claim 1, characterized in that: The moving mechanism (2) includes at least two track sections set on the climbing frame (14). The track sections are an outer track (22) and an inner track (21). The auxiliary crane (3) is connected to the track section through the moving seat (24). The surface of the moving seat (24) is provided with a driving part (25) and a driving wheel (26) driven by the driving part (25) to move along the track section.

5. The dismantling and construction method for a twin-tower cooling tower with an internally mounted steel structure according to claim 4, characterized in that: The drive wheel (26) is a gear, and the inner track (21) and outer track (22) are provided with meshing tooth grooves on the surfaces of the drive wheel (26) that are subjected to force.

6. The dismantling and construction method for a twin-tower cooling tower with an internally mounted steel structure according to claim 5, characterized in that: The shaft of the gear is also provided with a limiting wheel (27) for rotation, and the track has a guide groove corresponding to the limiting wheel (27) to prevent the gear from disengaging from the tooth groove.

7. The dismantling and construction method for a twin-tower cooling tower with built-in steel structure according to claim 4, characterized in that: The inner track (21) is fixed to the outside of the climbing frame (14) by mechanical connection, and the outer track (22) is connected to the inner track (21) by connecting rib (23). The corner of the inner track (21) is a right angle bend, and the corner of the outer track (22) is a rounded bend.

8. The method for dismantling and constructing a twin-tower cooling tower with an internal steel structure as described in claim 4, characterized in that: The drive unit (25) includes a motor and a worm gear / worm wheel reduction device.

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