A method for dismantling large factory buildings using tower cranes during expansion.

Abstract

This invention relates to the field of tower crane dismantling methods, specifically a method for dismantling tower cranes used in the expansion of large factories. After the construction of the modified or expanded steel structure components is completed, the tower crane's counterweight boom is lowered onto a temporary support set up on the roof of the lower-level factory structure via a reserved passageway in the high-rise factory structure, avoiding obstruction from the high-rise structure. With the cooperation of the lifting mast and the temporary support, the boom is dismantled and transported online to the end of the factory building, where it is lifted to the ground by a truck crane. The counterweight boom is directly dismantled and lifted to the ground using a high-span overhead crane. The tower body is dismantled by its own lifting system in conjunction with the truck crane, achieving self-lowering dismantling. By employing these three separate dismantling methods, the problem of dismantling tower cranes after the factory roof is closed is solved for large factory expansions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tower crane equipment dismantling method, in particular to a method for dismantling a tower crane for large plant expansion. BACKGROUND

[0002] In a large metallurgical production workshop with multiple platforms and overall layout, partial reconstruction or expansion is carried out. In addition to the reconstructed or expanded area, the remaining plant area generally cannot affect the normal production of other production lines. The conventional method is to use a tower crane for such installation. The tower crane has a long line and is covered by the steel structure member. The installation efficiency is high, and the workload of the plant structure is minimized. However, due to the structure of the tower crane, the tower crane needs to be dismantled before the roof steel structure member is closed in the conventional reconstruction or expansion project. Otherwise, the balance arm and the lifting arm of the tower crane will be blocked by the roof structure during the landing process and cannot be lowered for dismantling. The subsequent roof steel structure member hoisting lacks vertical hoisting equipment, resulting in slow construction speed. Alternatively, the tower crane is not dismantled first, and after the roof structure is closed, a large hoisting machine is used to dismantle the tower crane. This method requires high investment in machinery, and the large hoisting machine cannot reach the tower crane due to the large size of the roof of the large plant structure, resulting in difficulty in dismantling the tower crane. The above reasons cause difficulties in installing the roof steel structure member and dismantling the tower crane beyond the hoisting radius of the large hoisting machine, which restricts the progress of the project. SUMMARY

[0003] The purpose of the present application is to solve the problems in the prior art. Therefore, a method for dismantling a tower crane for large plant expansion is proposed, which solves the problem of dismantling the tower crane after the roof of the large plant is closed, speeds up the installation of the roof steel structure member, and ensures the progress of the project.

[0004] To achieve the above purpose, the present application discloses a method for dismantling a tower crane for large plant expansion. After the reconstruction or expansion of the steel structure member is completed, the balance arm of the tower crane passes through the reserved channel of the high-rise plant structure, the balance arm of the tower crane avoids the obstruction of the high-rise plant structure, and the tower crane lifting arm is lowered to the temporary support on the roof of the low-rise plant structure. The lifting arm is cooperated with the lifting mast and the temporary support to complete the online disassembly and transportation of the lifting arm to the end of the plant. The automobile crane is used to lift the lifting arm to the ground. The balance arm is directly dismantled and lifted to the ground by the high-span trolley. The tower body is cooperated with the automobile crane by using its own lifting system to realize self-lowering dismantling. The tower crane for large plant expansion solves the problem of dismantling the tower crane after the roof of the plant is closed by the above three kinds of dismantling methods. The steps are as follows:

[0005] First step: lower the tower crane to the low-rise plant structure:

[0006] After the high-rise factory building structure is completed, the tower crane is lowered by the lifting mechanism, and the balance arm passes through the pre-reserved concave channel of the high-rise factory building structure to realize the overall lowering of the tower crane until the lifting arm of the tower crane falls on the temporary support of the low-rise factory building structure.

[0007] Step 2: The lifting equipment of the balance arm is removed to the position:

[0008] After the pre-reserved high-rise roof beam of the concave channel of the high-rise factory building structure is completed and placed in place under the lifting of the pre-set lifting winch and hoisting short column, the high-rise factory building structure has become a stable structure at this time, and the high-span travelling crane can be moved to the right end of the high-rise factory building structure to be reconstructed or expanded to prepare for the removal of the balance arm of the tower crane below.

[0009] Step 3: Removal of the lifting arm and the balance arm:

[0010] First, the rear balance counterweight block on the balance arm is removed by the high-span travelling crane, and then the lifting arm on the temporary support is separated from the tower body under the hoisting cooperation of the lifting mast, and after the lifting arm is segmented on the temporary support, the segmented lifting arm components are manually slid through the temporary support to the end of the low-rise factory building structure, and then the automobile crane is used to complete the hoisting to the ground.

[0011] At the same time of removing the lifting arm components, the balance arm and the front balance counterweight block of the tower crane are separated from the tower body under the hoisting of the high-span travelling crane and directly hoisted to the ground below the high-rise factory building structure, thereby completing the removal of the equipment components of the tower crane above the low-rise factory building structure.

[0012] Step 4: Removal of the tower body:

[0013] After the lifting arm and the balance arm of the tower crane are removed, the tower body is not hindered by the lowering of the low-rise factory building structure, and the self-lowering type removal work of the tower body components is realized by using the self-lifting system of the tower crane and the cooperation of the automobile crane.

[0014] The temporary support and the lifting mast are respectively made of profile steel and round pipe, the temporary support includes H-shaped steel fixed by setting vertical columns combined with the spacing of the steel beams of the low-rise roof, and profile steel installed on the top of the plurality of H-shaped steels to support the transportation of the tower arm structure; the lifting mast is a segmented short steel pipe, and flanges are arranged at both ends of each short pipe, the short pipes are connected by bolts to realize the assembly of the lifting mast, and a lifting lug is arranged at the top end of the lifting mast to realize the hoisting of objects by using a hand-operated hoist or a lifting winch.

[0015] The hoisting short column is made of profile steel, and a lifting lug is arranged at the upper end thereof to be vertically fixed with the already placed high-rise roof beam to provide a support point for the placement of the pre-reserved high-rise roof beam.

[0016] Compared with the prior art, the present application has the following beneficial effects: after the construction of the modified or expanded steel structure member is completed, the balance arm of the tower crane passes through the reserved passage of the high-rise plant structure, the balance arm of the tower crane avoids the obstruction of the high-rise plant structure, and the tower crane lifting arm is lowered to the temporary support arranged on the roof of the low-rise plant structure, the lifting arm is disassembled and transported to the end of the plant under the cooperation of the lifting mast and the temporary support, and is lifted to the ground by the truck crane; the balance arm is directly removed and lifted to the ground by the high-span travelling crane; the tower body is lowered by the cooperation of its own lifting system and the truck crane, the tower body is disassembled in a self-lowering mode; the tower crane for large plant expansion solves the problem of disassembly of the tower crane after the roof of the plant is closed, reduces the problem of in-situ positioning of large steel structure members in the modification or expansion project, and ensures the progress of the engineering construction. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the arrangement of the tower crane in the method for disassembling the tower crane for large plant expansion proposed by the present application;

[0018] Figure 2 is Figure 1 A schematic diagram of the A direction;

[0019] Figure 3 is a schematic diagram of the lowering of the tower crane to the low-rise plant structure;

[0020] Figure 4 is a schematic diagram of the installation of the reserved high-rise roof beam;

[0021] Figure 5 is a schematic diagram of the disassembly of the tower crane lifting arm and balance arm;

[0022] Figure 6 is a schematic diagram of the disassembly of the tower body;

[0023] In the drawings: 1, low-rise plant structure; 2, high-rise plant structure; 3, tower body; 4, balance arm; 5, rear balance counterweight; 6, front balance counterweight; 7, lifting arm; 8-1, temporary support; 8-2, lifting mast; 9, lifting winch; 10, lifting short column; 11, high-span travelling crane; 12, reserved high-rise roof beam. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0025] A steel plant in the original steel plant 2 120 t converter configuration, expansion and reconstruction of 120 t converter set, involving steelmaking high span steel structure reconstruction and expansion of steel structure construction total nearly 2000 t, the transformation and expansion of the area contains 6 layers of equipment steel structure platform installation, expansion of the total height of the plant building 52 m, width 24 m. A large plant expansion tower crane demolition method solves the problem of tower crane demolition after the transformation or expansion of the large plant building surface is closed, speeds up the speed of the steel structure member in place of the plant building surface, see the attached drawings for details.

[0026] A large plant expansion tower crane demolition method is that after the transformation or expansion of the steel structure member construction is completed, the balance arm of the tower crane passes through the reserved channel of the high-rise plant structure, realizes the balance arm of the tower crane to avoid the obstruction of the high-rise plant structure, and realizes the tower crane jib to fall on the temporary support set at the low-rise plant structure roof. The jib is cooperated with the temporary support and the lifting mast to complete the online disassembly and transportation of the jib to the end of the plant building, and is lifted to the ground by the car crane. The balance arm is directly lifted to the ground by the high-span travelling crane. The tower body is cooperated with the car crane by its own lifting system to realize self-lowering type demolition. The large plant expansion tower crane solves the problem of tower crane demolition after the plant building surface is closed by the above three kinds of shunt removal methods. The steps are:

[0027] As shown in Figure 1 , Figure 2 , Figure 3 The first step: the tower crane is lowered to the low-rise plant structure 1, that is, after the construction of the high-rise plant structure 2 is completed, the balance arm 4 of the tower crane passes through the concave channel of the high-rise plant structure 2 reserved in advance, realizes the overall descent of the tower crane, and the jib 7 of the tower crane falls on the temporary support 8-1 of the low-rise plant structure 1.

[0028] As shown in Figure 4 , Figure 5 The second step: the hoisting equipment of the balance arm 4 is in place, that is, after the reserved high-rise roof beam 12 of the high-rise plant structure 2 is completed in place under the hoisting action of the hoisting winch 9 and the hoisting short column 10, the high-rise plant structure 2 has become a stable structure at this time, and the high-span travelling crane 11 can be moved to the right end of the transformed or expanded high-rise plant structure 2, ready for the balance arm 4 of the tower crane below.

[0029] As shown in Figure 5As shown, the third step: the removal of the jib 7 and the counterweight 4, i.e. the rear counterweight 5 on the counterweight 4 is removed by the high-span travelling crane 11, and then the jib 7 on the temporary support 8-1 is separated from the tower 3 under the hoisting cooperation of the hoisting mast 8-2, and the segmented jib 7 is manually slid through the temporary support 8-1 to the end of the low-level plant structure 1, and then hoisted to the ground by the truck crane; at the same time, the counterweight 4 and the front counterweight 6 are separated from the tower 3 and directly hoisted to the ground under the hoisting of the high-span travelling crane 11, thereby completing the removal of the equipment components of the tower crane above the low-level plant structure 1.

[0030] As shown in Figure 6 The fourth step: the removal of the tower 3, i.e. after the removal of the jib 7 and the counterweight 4 of the tower crane, the tower 3 is not hindered by the lowering of the low-level plant structure 1, and the self-lowering removal of the tower 3 components is realized by the self-lifting system of the tower crane and the cooperation of the truck crane.

[0031] The temporary support 8-1 and the hoisting mast 8-2 are made of H-shaped steel and round pipes respectively, the temporary support 8-1 includes H-shaped steel fixed by setting columns between steel beams of the low-level roof, and steel for supporting the tower arm structure and installed on the top of the H-shaped steel; the hoisting mast 8-2 is a segmented short steel pipe, and each section of the short pipe is provided with flanges at both ends, the short pipes are connected by bolts, the hoisting mast 8-2 is assembled, the top end of the hoisting mast 8-2 is provided with lifting lugs, and the hoisting of objects is realized by using a hand-operated hoist or a hoisting winch.

[0032] The hoisting short column 10 is made of steel, and the upper end is provided with lifting lugs, which are vertically fixed with the already positioned high-level roof beam to provide a support point for the positioning of the reserved high-level roof beam 12.

Claims

1. A method for removing a tower crane for expansion of a large factory building, characterized in that: first step: the tower crane is lowered to a lower factory building structure (1); after the high factory building structure (2) is completed, the tower crane is lowered by the balance arm (4) through the pre-prepared concave channel of the high factory building structure (2) under the action of the lifting mechanism, until the tower crane's lifting arm (7) falls on the temporary support (8-1) of the lower factory building structure (1); second step: the lifting equipment of the balance arm (4) is removed in place; after the pre-prepared high roof beam (12) of the concave channel of the high factory building structure (2) is completed in place under the lifting of the pre-prepared lifting hoist (9) and hoisting short column (10), the high factory building structure (2) has become a stable structure, and the high-span trolley (11) can be moved to the right end of the modified or expanded high factory building structure (2) to prepare for the removal of the balance arm (4) of the tower crane below; third step: the lifting arm (7) and the balance arm (4) are removed; the rear balance weight block (5) on the balance arm (4) is removed first, and then the lifting arm (7) on the temporary support (8-1) is separated from the tower body (3) under the lifting of the lifting mast (8-2), and the segmented lifting arm (7) is manually slid to the end of the lower factory building structure (1) through the temporary support (8-1), and then lifted to the ground by the truck crane; at the same time, the balance arm (4) and the front balance weight block (6) of the tower crane are separated from the tower body (3) and directly lifted to the ground under the lifting of the high-span trolley (11), thereby completing the removal of the equipment components of the tower crane above the lower factory building structure (1); fourth step: the tower body (3) is removed; after the lifting arm (7) and the balance arm (4) of the tower crane are removed, the tower body (3) is not hindered by the lowering of the lower factory building structure (1), and the tower body (3) is removed by the self-lifting system of the tower crane and the truck crane. The temporary support (8-1) and the lifting mast (8-2) are respectively made of section steel and round pipe, the temporary support (8-1) includes H-shaped steel fixed by combining the spacing of the steel beams of the lower roof and the section steel installed on the top of the H-shaped steel to support the transportation of the tower arm structure, and the lifting mast (8-2) is a segmented short steel pipe, each end of which is provided with a flange, the short pipes are connected by bolts, the lifting mast (8-2) is assembled, the top end of the lifting mast (8-2) is provided with an ear, and the object is lifted by a hand-operated hoist or a lifting hoist. The hoisting short column (10) is made of section steel, the upper end of which is provided with an ear, which is vertically fixed with the in-place high roof beam to provide a support point for the in-place pre-prepared high roof beam (12). ​ ​ ​ ​ ​ ​ ​ 2. A method according to claim 1, characterized in that: ​ 3. A method of removing a tower crane for an extension of a large industrial building according to claim 1, characterized in that: ​

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