Stand limited space steel column mounting and dismounting method adopting annular crane

Abstract

The invention relates to a method for assembling and disassembling a steel column in a restricted space of a grandstand by adopting an annular crane, which is characterized in that the steel column is hoisted by a crane suspended on a fixed grandstand and a movable grandstand through a rope in the restricted space. Three cranes of a stand are used for putting down hinges to hoist a steel column, the hoisting direction of the steel column and the positions of the cranes are obtained through lofting, the hinge of one crane plays a leading role and provides pulling force, and the other two hinges play an auxiliary role and are used for controlling the direction. The steel columns serve as supporting columns, a flat stand can be built, and added stand seats are placed on the stand. The crane can move along the annular crane rail on the edge of the stand to complete mounting and dismounting of the steel columns in the longitudinal area. The fixed stand is of a concrete structure and cannot move; the movable grandstand is a steel structure single body and can be moved to a corresponding position according to actual requirements, assembly and disassembly of a transverse area are completed, and the movable grandstand moves by means of a steel wheel trolley and a pallet truck at the bottom.

Description

Technical Field

[0001] The present invention relates to the field of steel structure engineering construction, and specifically to a method for installing and disassembling steel columns in a restricted space of a grandstand using a circular crane. Background Art

[0002] Overview: In movable structures, the structural layout of the space will be converted and adjusted according to the actual functional requirements of the site. As a structure connecting the ground and the platform, the steel column plays an important supporting role. When the platform does not need to be built on the site, the steel column can be removed to provide ground space for other structures.

[0003] Process: The steel column arrives, the ground steel guard plate is laid, the crane enters the site, adjusts the position, stabilizes the legs, and hoists.

[0004] Disadvantages: For restricted spaces, the crane is relatively large in volume and cannot drive into the site smoothly for operation. Moreover, the self-weight of the crane may damage the original structure, and additional ground treatment is required. When a part of the steel columns are hoisted, the upright state of the steel columns will affect the movement of the crane inside the site, and it may even be unable to pass, resulting in the inability to complete the subsequent hoisting. Summary of the Invention

[0005] The present invention aims to overcome the defects of the prior art, and provides a method for installing and disassembling steel columns in a restricted space of a grandstand using a circular crane, to solve the problem of hoisting steel columns in a restricted space, improve the steel structure installation efficiency, and increase the utilization rate of the grandstand space.

[0006] To solve the above technical problems, the present invention is implemented as follows: A method for installing and disassembling steel columns in a restricted space of a grandstand using a circular crane, characterized in that The construction process for installing steel columns: 1. The forklift transports the steel column to the designated column base position, and installs the column base limit device to achieve the purpose of fixing the column base without misalignment during the process of placing the steel column upside down; 2. According to the model lofting result, the movable grandstand is driven along the trolley track to the right side of Column A. Three of the circular cranes at the fixed grandstand and the movable grandstand ends are controlled to travel along the track beam to the designated points, and the locking device is used to fix the position of the crane on the track beam; 3. Extend the three hinges of the circular crane, lower the hook to the lifting lug of Column A and connect; start the main crane providing the pulling force, and lift Column A by retracting the hinge, and the auxiliary crane cooperates to adjust the direction; until Row A columns are hoisted to the upright state, and the steel column base nodes are fixed with high-strength bolts; 4. The movable grandstand is driven along the trolley track to the right side of Columns B / C. Using the same method as in Step 1, hoist Columns B / C to the upright state and fix the column bases; 5. After all the steel columns are lifted, use them as support columns, install the flat grandstand and place the additional grandstand sections to be added. Horizontally and vertically, at least two steel columns should be arranged respectively. Steel column demolition construction process: 1. The steel columns should be laid down in reverse order, that is, from right to left (from column C to column A) in sequence. 2. Clear the structure above the flat grandstand and the stacked items, and demolish the flat grandstand. 3. Move the movable grandstand along the trolley track to the right side of column C. Three ring cranes travel along the track beam to the designated positions. Lower the hinge to make the hook reach the steel column lifting lug position and connect. Remove the high-strength bolts at the column base, start the ring crane providing the main pulling force to make the steel column fall down. At the same time, start the other two cranes to control the direction of the falling column until the steel column is laid down horizontally, and use a forklift to transport it to the designated storage location. 4. Move the movable grandstand along the trolley track to the right side of column B / A, and use the same method to demolish the steel column and transport it to the stacking site.

[0007] The beneficial effects of the present invention are as follows: As can be seen from the above technical solutions, the present application provides a method for installing and demolishing steel columns in a limited space of a grandstand using ring cranes. In this steel column installation and demolition method, within the limited space, four cranes suspended from the fixed grandstand and the movable grandstand lift the steel columns through ropes. After the hoisting is completed, the steel columns are used as support columns to build the flat grandstand, and additional grandstand seats can be placed on the grandstand. The crane can move along the ring crane track on the edge of the grandstand to complete the installation and demolition of the steel columns in the longitudinal area. The fixed grandstand is a concrete structure and cannot be moved; the movable grandstand is a steel structure monomer and can be moved to the corresponding position according to actual needs to complete the installation and demolition in the horizontal area. The movement of the movable grandstand depends on the steel wheel trolleys and pallet trucks at the bottom.

[0008] It has the following advantages: The construction method is simple and the economic cost is low; it solves the problems of difficult entry and driving of cranes in limited spaces; the combination of the fixed grandstand and the movable grandstand solves the problem of lifting steel columns in the horizontal space; with the use of the crane track beam, the crane can move along the edge of the grandstand to solve the problem of lifting steel columns in the longitudinal space; the crane is attached to the edge of the grandstand with less impact on the original structure; compared with cranes, the ring crane is more lightweight and more flexible during the conversion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The following further describes the present invention in detail in conjunction with the drawings and embodiments: Figure 1 It is a grandstand distribution diagram; Figure 2 It is a grandstand plan view; Figure 3 It is an installation direction schematic diagram; Figure 4 It is the detailed drawing of the fixed grandstand; Figure 5 It is the conversion state of the movable grandstand; Figure 6 It is the hoisting process of Column A; Figure 7 It is the upright state of Column A; Figure 8 It is the hoisting process of Column B; Figure 9 It is the upright state of Column B; Figure 10 It is the hoisting process of Column C; Figure 11 It is the upright state of Column C; Figure 12 It is the installation flow chart of the steel column; Figure 13 It is the disassembly flow chart of the steel column. Specific implementation manners

[0010] Next, the technical solutions of the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope claimed by the present application.

[0011] A method for installing and disassembling steel columns in the restricted space of a grandstand using a ring crane, As Figure 1 shown, in this method for installing and disassembling steel columns, within the restricted space, four cranes suspended from the fixed grandstand and the movable grandstand lift the steel columns through ropes. The number of columns (in the direction of Axis I - III in Figure 2 , that is, longitudinally) and the number of rows (the direction perpendicular to the axis, that is, transversely) are determined according to the actual situation of the site and can be increased or decreased. A limit hinge point is installed at the column foot to fix the position of the column foot. Using three of the cranes on the grandstand (as shown in Figure 3 ), the hinge is lowered to hoist the steel column. The hoisting direction of the steel column and the positions of the cranes are obtained through lofting. Among them, the hinge of one crane plays a leading role in providing tension, and the other two hinges play an auxiliary role in controlling the direction. After the hoisting is completed, the steel column serves as a support column, and a flat grandstand can be built on which additional grandstand seats can be placed. The crane can move along the circular crane track on the edge of the grandstand to complete the installation and disassembly of the steel columns in the longitudinal area. The fixed grandstand is a concrete structure and cannot be moved; the movable grandstand is a single steel structure unit and can be moved to the corresponding position according to actual needs to complete the installation and disassembly in the transverse area. The movement of the movable grandstand relies on the steel wheel trolleys and pallet trucks at the bottom.

[0012] As Figure 4 shown, the fixed grandstand: 1. Ring crane - No. 1 a. Steel material, electric hoist; b. The hook can move up and down to lift the horizontally placed steel column or reverse the vertically placed steel column, realizing the function of installing and removing the steel column; c. There are pulleys at the hanging point of the crane, which can move along the edge of the fixed stand; d. It has a locking device, which plays a role in fixing the ring crane when the crane moves to the ideal position; e. Two cranes are used in cooperation.

[0013] 2. Track beam a. Steel material, I - shaped steel, with stiffening plates set at the joints; b. The track beam is arranged along the edge of the fixed stand, and the crane is suspended below the beam. The crane can slide on the track to achieve the purpose of sharing one crane in the same longitudinal area.

[0014] As Figure 5 shown, movable stand: 3. Movable stand a. Steel material, composed of trusses and supports; b. According to actual needs, it can move to the corresponding position along the trolley track beam to meet the hoisting requirements of the steel column and the functional requirements of the stand c. Two cranes are used in cooperation.

[0015] 4. Ring crane - No. 2 a. Steel material, with the same structural function as the ring crane - No. 1; b. Hung at the corbel of the movable stand.

[0016] 5. Steel wheel trolley a. When converting the state, use the oil cylinder to lift the movable stand and add an extension section to the trolley; b. The lifted trolley makes the legs leave the ground, facilitating the movement of the movable stand; c. The trolley has a driving function and can make the movable stand move along the trolley track; d. When the conversion is completed, remove the extension section, let the legs fall back to the ground, and then perform the hoisting action.

[0017] 6. Pallet truck a. When converting the state, remove the front legs of the movable stand, and the pallet truck extends into the front structure to play a supporting role; b. It has a driving function to make the movable stand move horizontally; c. When the conversion is completed, withdraw the pallet truck and install the front legs back to their original positions to play a supporting role.

[0018] As Figure 12As shown, the steel column installation construction process: 1. The forklift transports the steel column to the designated column foot position and installs the column foot limit device to achieve the purpose of fixing the column foot without misalignment during the inverted placement of the steel column.

[0019] 2. According to the model layout results, move the movable stand along the trolley track to the right side of the A-pillar, operate three of the circular cranes at the fixed stand and movable stand ends to move along the track beam to the designated point, and use the locking device to fix the position of the crane on the track beam.

[0020] 3. Extend the three hinges of the circular crane, lower the hook to the A-pillar lifting lug and connect it; start the main crane that provides the pulling force, and lift the A-pillar by retracting the hinge (such as Figure 6 until the A-row columns are hoisted to an upright position (as shown in Figure 7 As shown in the figure), high-strength bolts are used to fix the steel column base nodes.

[0021] 4. Move the movable stand along the trolley track to the right side of the B / C column. Use the same method as step 1 to lift the B / C column to an upright position and fix the column foot (such as Figures 8 - 11 ).

[0022] 5. After all the steel columns are hoisted, they are used as supporting columns to install the flat stands and place the additional stands to meet the actual demand for stands and improve space utilization. The number of steel columns is determined according to the site conditions and actual functional requirements. Considering the structural strength and stability, at least two steel columns are arranged horizontally and vertically respectively. The constructed platform can also be used for other functions, such as exhibition, rest, communication, etc.

[0023] like Figure 13 As shown, the construction process of inverted steel column: 1. The order of laying down the steel columns is in reverse order, that is, from right to left (from C-pillar to A-pillar).

[0024] 2. Clear the structure and stacked items above the flat stand and dismantle the flat stand.

[0025] 3. Move the movable stand along the trolley track to the right side of the C-pillar. Move the three circular cranes along the track beam to the designated point. Lower the hinges so that the hooks are at the position of the steel column lifting ears and connect them. Remove the high-strength bolts at the column base and start the circular crane that provides the main pulling force to make the steel column fall down. At the same time, start the other two cranes to control the direction of the falling column until the steel column is inverted to a horizontal state and use a forklift to transport it to the designated storage location.

[0026] 4. Move the movable stand along the trolley track to the right side of the B / A column, use the same method to remove the steel column, and transport it to the stacking site.

[0027] The above are only the embodiments provided by this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A method for installing and removing steel columns in a limited space of a grandstand using a circular crane, characterized in that: Steel column installation construction process:

1. Transport steel columns; 2. According to the model layout results, move the movable stand along the trolley track to the right side of the A-pillar, operate the three circular cranes at the fixed stand and movable stand end to move along the track beam to the designated point, and use the locking device to fix the position of the crane on the track beam; 3. Extend the three hinges of the circular crane, lower the hook to the A-pillar lifting lug and connect it; start the main crane that provides the pulling force, lift the A-pillar by retracting the hinge, and adjust the direction with the platform crane; until the A-row columns are lifted to an upright state, use high-strength bolts to fix the steel column foot nodes; 4. The movable stand moves along the trolley track to the right side of the B / C pillar. Use the same method as step 1 to lift the B / C pillar to an upright position and fix the pillar foot.

5. After all the steel columns are hoisted, they are used as supporting columns to install the flat stands and place the stands that need to be added. At least two steel columns are arranged horizontally and vertically respectively; Steel column removal construction process:

1. Turn the steel column upside down; 2. Clean the structure and stacked items above the flat stand and dismantle the flat stand; 3. Move the movable stand along the trolley track to the right side of the C-pillar. Move the three circular cranes along the track beam to the designated point. Lower the hinges so that the hooks are at the position of the steel column lifting ears and connect them. Remove the high-strength bolts at the column foot and start the circular crane that provides the main pulling force to make the steel column fall down. At the same time, start the other two cranes to control the direction of the falling column until the steel column is inverted to a horizontal state, and use a forklift to transport it to the designated storage location.

4. Move the movable stand along the trolley track to the right side of the B / A column, use the same method to remove the steel column, and transport it to the stacking site.

2. The method for installing and removing steel columns in a limited space of a grandstand using a circular crane according to claim 1, characterized in that: The forklift transports the steel column to the designated column foot position and installs the column foot limiting device to achieve the purpose of fixing the column foot and preventing it from being misaligned during the inverted placement of the steel column.

3. The method for installing and removing steel columns in a limited space of a grandstand using a circular crane according to claim 1, characterized in that: The order of laying down the steel columns is in reverse order, that is, from right to left (from C-pillar to A-pillar).

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