Construction method of large-span edge unsupported steel structure net rack

Abstract

The application discloses a construction method of a large-span edge non-support steel structure net rack, which comprises the following steps: installing a lifting device on a constructed structure column, and lifting and installing a first steel structure net rack and a second steel structure net rack through the lifting device; installing a first temporary support and a second temporary support; hoisting a crane to the upper side of a constructed floor slab; block-assembling a third steel structure net rack, and lifting and installing the block-assembled third steel structure net rack through the crane. The outermost third steel structure net rack is not provided with an existing building structure column, the first temporary support is arranged to ensure the support under the third steel structure net rack, but the temporary support is unstable in stress, the lifting device cannot be installed, the crane needs to be hoisted to the constructed floor slab, the crane is heavy, and the constructed floor slab is at the risk of being damaged, therefore, the tires of the crane are widened, and the second temporary support is arranged under the constructed floor slab, so that the construction efficiency and the construction quality are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building construction technology, in particular to a construction method of large-span edge unsupported steel structure net rack. BACKGROUND

[0002] In the construction of buildings, the traditional hoisting of steel structures is completed by large hoisting equipment. However, in the construction of the steel structure project of Hengdian Station, the above method is not applicable. The east and west sides of the project are the import and export of the railway, and there are tracks under construction and tracks that have been completed. The south and north sides of the project are under construction by other construction units, and there is no large hoisting equipment working position. Moreover, the steel structure net rack located on the south side of the project not only has a large span, but also has an unsupported structure at the bottom of the outermost net rack on three sides, which is difficult to construct. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application designs a construction method of large-span edge unsupported steel structure net rack, comprising the following steps: step 1, determining the installation position of the lifting device on the constructed structural column, and installing the lifting device on the constructed structural column; step 2, assembling the first steel structure net rack and the second steel structure net rack respectively, and lifting and installing the first steel structure net rack and the second steel structure net rack by the lifting device; step 3, installing the first temporary support and the second temporary support; step 4, hoisting a crane to the upper side of the constructed floor; step 5, assembling the third steel structure net rack in blocks, and lifting and installing the third steel structure net rack assembled in blocks by the crane; step 6, hoisting the crane to the ground, and removing the first temporary support and the second temporary support, and the construction is completed.

[0004] Preferably, in step 1, the installation position of the lifting device on the constructed structural column is determined, comprising the following steps: establishing a model of the constructed structural column, the first steel structure net rack and the second steel structure net rack, and establishing a model of the lifting device on the constructed structural column; simulating the lifting of the model of the first steel structure net rack or the model of the second steel structure net rack by the model of the lifting device, determining whether the model of the lifting device will collide with the model of the first steel structure net rack or the model of the second steel structure net rack in the simulation process, if there is no collision, the position of the lifting device is the installation position; if there is a collision, adjust the position of the model of the lifting device, and simulate the lifting again until the positions of all the lifting devices are determined.

[0005] Preferably, in step 1, the lifting device is installed on the constructed structural column, comprising the following steps: installing one lifting device on the inner side of the constructed structural column at the edge position; installing one lifting device on each side of the constructed structural column at the middle position; connecting all the lifting devices to the control system.

[0006] Preferably, in step 2, the first steel structure grid and the second steel structure grid are assembled respectively, and the first steel structure grid and the second steel structure grid are lifted and installed respectively by a lifting device, comprising the following steps: assembling the first steel structure grid at a first assembly position, and lifting and installing the first steel structure grid by a lifting device; assembling the second steel structure grid at a second assembly position, and lifting and installing the second steel structure grid by a lifting device.

[0007] Preferably, the first assembly position is the first floor layer that has been constructed directly below the first steel structure grid installation position, and the second assembly position is the first floor layer that has been constructed directly below the second steel structure grid installation position.

[0008] Preferably, in step 3, installing the first temporary support and the second temporary support includes the following steps: installing the first temporary support below the third steel structure grid installation position; installing the second temporary support below the constructed floor slab outside the first temporary support.

[0009] Preferably, in step 4, a crane is lifted to the top of the constructed floor slab, including the following steps: widening the tires of the crane to increase the contact surface with the constructed floor slab; and lifting the crane to the constructed floor slab supported by a second temporary support.

[0010] Preferably, in step 5, the third steel structure grid is assembled in blocks, and the assembled third steel structure grid is lifted and installed by a crane, comprising the following steps: assembling the blocks of the third steel structure grid on the constructed floor slab; lifting the assembled third steel structure grid blocks to the installation position by a crane, wherein one end of the third steel structure grid block is supported on the constructed structural column, and the other end of the third steel structure grid block is supported on the first temporary support; connecting the third steel structure grid block to the completed first steel structure grid or the second steel structure grid by a patching rod; repeating the above steps until the third steel structure grid is installed.

[0011] Compared with the closest prior art, the present invention has the following beneficial effects:

[0012] 1. The present invention utilizes existing building structure columns to lift the first steel structure grid and the second steel structure grid, installs a lifting device on the structure column, and adopts a method of on-site assembly and on-site lifting. No large-scale lifting equipment is required to complete the lifting. In the case of limited space, the large-span steel structure grid can be quickly lifted.

[0013] 2. The outermost third steel structure grid of the present invention does not have any existing building structure columns. The support below the third steel structure grid is guaranteed by setting a first temporary support. The temporary support is unstable in stress, so the lifting device cannot be installed on the temporary support. Only other lifting equipment can be used to complete the lifting. The crane needs to be lifted to the constructed floor slab. However, the weight of the crane is large and there is a risk of damaging the constructed floor slab. Therefore, the tires of the crane are widened and a second temporary support is set below the constructed floor slab. This can not only ensure the construction efficiency of the third steel structure grid, but also ensure the final molding quality of the third steel structure grid, thereby ensuring the overall construction quality.

[0014] 3. The present invention controls multiple lifting devices simultaneously through a control system, which can ensure that each point of the first steel structure grid and the second steel structure grid are lifted synchronously, avoid skewing during the lifting process, reduce deformation during the lifting process, and ensure the quality of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic flow chart of the construction method of the present invention.

[0016] Figure 2 It is a structural schematic diagram of the steel structure grid of the present invention.

[0017] Figure 3 It is a structural schematic diagram of the constructed building of the present invention.

[0018] Figure 4 This is a schematic diagram of the assembled structure of the first steel structure grid of the present invention.

[0019] Figure 5 This is a schematic diagram of the installation structure of the first steel structure grid of the present invention.

[0020] Figure 6 This is a schematic diagram of the assembly structure of the second steel structure grid of the present invention.

[0021] Figure 7 This is a schematic diagram of the installation structure of the second steel structure grid of the present invention.

[0022] Figure 8 It is a structural schematic diagram of the temporary support of the present invention.

[0023] Figure 9 This is a schematic diagram of the third steel structure grid assembly structure of the present invention.

[0024] Figure 10 This is a schematic diagram of the third steel structure grid installation structure of the present invention.

[0025] Figure 11 This is a structural schematic diagram of the completed construction of the large-span edge-unsupported steel structure grid of the present invention.

[0026] Reference numerals:

[0027] 1-first steel structure grid, 2-second steel structure grid, 3-third steel structure grid, 4-constructed floor slab, 5-constructed structural column, 6-first temporary support, 7-second temporary support. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] Example 1

[0030] like Figures 1-11 As shown, the present invention provides a construction method for a large-span edge-unsupported steel structure grid, comprising the following steps:

[0031] S1. Determine the installation position of the lifting device on the constructed structural column 5 and install the lifting device on the constructed structural column 5. Build models of the constructed structural column 5, the first steel structure grid 1, and the second steel structure grid 2, and build a model of the lifting device on the constructed structural column 5. Use the lifting device model to simulate lifting the model of the first steel structure grid 1 or the second steel structure grid 2. Determine whether the lifting device model will collide with the model of the first steel structure grid 1 or the second steel structure grid 2 during the simulation. If no collision occurs, the position of the lifting device is the installation position. If a collision occurs, adjust the lifting device model position and re-simulate the lifting until the positions of all lifting devices are determined. Install a lifting device inside the constructed structural column 5 at the edge; install a lifting device on each side of the constructed structural column 5 at the center. Connect all lifting devices to a control system. By controlling multiple lifting devices simultaneously through the control system, the first and second steel structure grids can be lifted synchronously at all points, preventing skew and deformation during the lifting process, and ensuring construction quality.

[0032] S2. Assemble the first steel structure grid 1 and the second steel structure grid 2 respectively, and lift and install the first steel structure grid 1 and the second steel structure grid 2 respectively through the lifting device. Assemble the first steel structure grid 1 at the first assembly position, and lift and install the first steel structure grid 1 through the lifting device; assemble the second steel structure grid 2 at the second assembly position, and lift and install the second steel structure grid 2 through the lifting device. The first assembly position is the first floor slab layer that has been constructed directly below the installation position of the first steel structure grid 1, and the second assembly position is the first floor slab layer that has been constructed directly below the installation position of the second steel structure grid 2. Use the existing building structure columns to lift the first steel structure grid and the second steel structure grid, install the lifting device on the structure column, and adopt the method of on-site assembly and on-site lifting. No large lifting equipment is required to complete the lifting. When space is limited, large-span steel structure grids can be quickly lifted.

[0033] S3, install the first temporary support 6 and the second temporary support 7. Install the first temporary support 6 below the installation position of the third steel structure grid 3; install the second temporary support 7 outside the first temporary support 6 and below the constructed floor 4.

[0034] S4. A crane is hoisted to the top of the constructed floor 4. The tires of the crane are widened to increase the contact surface with the constructed floor 4; the crane is hoisted to the constructed floor 4 supported by the second temporary support 7.

[0035] S5. Assemble the third steel structure grid 3 in blocks, and lift and install the assembled third steel structure grid 3 by a crane; assemble the blocks of the third steel structure grid 3 on the constructed floor slab 4; lift the assembled third steel structure grid 3 blocks to the installation position by a crane, wherein one end of the third steel structure grid 3 block is supported on the constructed structural column 5, and the other end of the third steel structure grid 3 block is supported on the first temporary support 6; connect the third steel structure grid 3 blocks with the completed first steel structure grid 1 or second steel structure grid 2 by patching rods; repeat the above S until the third steel structure grid 3 is installed. The outermost third steel structure grid does not have any existing building structure columns. The support below the third steel structure grid is guaranteed by setting up a first temporary support. The temporary support is unstable, so the lifting device cannot be installed on the temporary support. Only other lifting equipment can be used to complete the lifting. The crane needs to be lifted to the constructed floor slab, but the weight of the crane is large and there is a risk of damaging the constructed floor slab. Therefore, the tires of the crane are widened and a second temporary support is set up below the constructed floor slab. This can not only ensure the construction efficiency of the third steel structure grid, but also ensure the final molding quality of the third steel structure grid, thereby ensuring the overall construction quality.

[0036] S6. Lift the crane to the ground, remove the first temporary support 6 and the second temporary support 7, and the construction is completed.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the pending claims.

Claims

1. A construction method for a large-span steel structure grid with no support at the edge, characterized in that: The following steps are involved: Step 1: Determine the installation position of the lifting device on the constructed structural column (5), and install the lifting device on the constructed structural column (5); Step 2: assembling the first steel structure grid (1) and the second steel structure grid (2) respectively, and lifting and installing the first steel structure grid (1) and the second steel structure grid (2) respectively by means of a lifting device; Step 3: Install the first temporary support (6) and the second temporary support (7); Step 4: Lift a crane to the top of the constructed floor slab (4); Step 5, assembling the third steel structure grid (3) in blocks, and lifting and installing the assembled third steel structure grid (3) by a crane; Step 6: Lift the crane to the ground and remove the first temporary support (6) and the second temporary support (7). The construction is completed. Wherein, in step 2, the first steel structure grid (1) and the second steel structure grid (2) are assembled respectively, and the first steel structure grid (1) and the second steel structure grid (2) are lifted and installed respectively by a lifting device, including the following steps: Assembling a first steel structure grid (1) at a first assembly position, and lifting and installing the first steel structure grid (1) using a lifting device; assembling a second steel structure grid (2) at a second assembly position, and lifting and installing the second steel structure grid (2) using a lifting device; In step 3, the first temporary support (6) and the second temporary support (7) are installed, including the following steps: Installing a first temporary support (6) below the installation position of the third steel structure grid (3); Install a second temporary support (7) below the constructed floor slab (4) outside the first temporary support (6); In step 4, a crane is hoisted above the constructed floor slab (4), comprising the following steps: Widen the crane's tires to increase the contact surface with the constructed floor slab (4); Lifting the crane onto the constructed floor slab (4) supported by the second temporary support (7); In step 5, the third steel structure grid (3) is assembled in blocks, and the assembled third steel structure grid (3) is lifted and installed by a crane, which includes the following steps: Assembling the blocks of the third steel structure grid (3) on the constructed floor slab (4); The assembled third steel structure grid (3) is hoisted to the installation location by a crane, wherein one end of the third steel structure grid (3) is supported on the constructed structural column (5), and the other end of the third steel structure grid (3) is supported on the first temporary support (6); Connecting the third steel structure grid (3) in blocks to the completed first steel structure grid (1) or second steel structure grid (2) through patching rods; Repeat the above steps until the third steel structure grid (3) is installed.

2. The construction method of the large-span edge-unsupported steel structure grid according to claim 1, characterized in that: In step 1, the installation position of the lifting device on the constructed structural column (5) is determined, including the following steps: Establishing models of the constructed structural column (5), the first steel structure grid (1), and the second steel structure grid (2), and establishing a model of a lifting device on the constructed structural column (5); Simulating the lifting of the model of the first steel structure grid (1) or the model of the second steel structure grid (2) by using the model of the lifting device, and determining whether the model of the lifting device collides with the model of the first steel structure grid (1) or the model of the second steel structure grid (2) during the simulation process; if no collision occurs, the position of the lifting device is the installation position; If a collision occurs, the lifting is simulated again after adjusting the model position of the lifting device until the positions of all lifting devices are determined.

3. The construction method of the large-span edge-unsupported steel structure grid according to claim 1, characterized in that: In step 1, the lifting device is installed on the constructed structural column (5), including the following steps: Installing a lifting device on the inner side of the constructed structural column (5) at the edge position; A lifting device is installed on each side of the constructed structural column (5) at the middle position; All lifting devices are connected to the control system.

4. The construction method of the large-span edge-unsupported steel structure grid according to claim 1, characterized in that: The first assembly position is the first floor slab layer that has been constructed directly below the installation position of the first steel structure grid (1), and the second assembly position is the first floor slab layer that has been constructed directly below the installation position of the second steel structure grid (2).

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