Installation construction method of double spiral rising double twist bending cantilever steel structure square tube on the facade

Abstract

The present invention relates to the field of building construction, and in particular to a method for installing square tubes of a double-helix rising double-twisted cantilever steel structure on a facade. A detailed design is first performed. The construction method can effectively connect and fix the cantilever steel main beam to the main structure cylinder by welding through the arc-shaped embedded parts, thereby facilitating the subsequent welding and fixing of the cantilever steel side beam and the cantilever main beam. In addition, the hand chain hoist and the automobile crane lifting method are provided, so that the construction process of the cantilever steel structure on the facade is innovatively adopted in the process of concrete main structure construction. The construction method of synchronous interlacing and coordinated lifting and installation solves the problem that the facade scaffolding and cantilever floor support frame affect the lifting and installation of the cantilever steel structure components on the facade of the high-rise building during the civil construction process. While improving the processing quality of the double-helix rising double-twisted cantilever steel structure on the facade, the construction period of the lifting and installation of the facade steel structure is greatly shortened, and the economic benefits are remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to an installation construction method for square tubes of double-spiral rising double-twisted bending cantilevered steel structures on facades. Background Art

[0002] With the high-quality development of my country's construction industry, more and more specialized and innovative urban landmark buildings have appeared around us. As the most widely used type of building structure, the application of steel structure has become one of our current research focuses, especially when it comes to the innovative steel structure type of the main structure facade of the building. The main keels attached to the curtain walls of some buildings are mostly steel structures, but it is more difficult to construct the steel structure of the facade of some buildings with complex structural shapes. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings existing in the prior art and to propose an installation and construction method for a double-spiral rising double-twisted cantilevered steel structure square tube on an exterior facade.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The installation and construction method of the double-helix rising double-twisted curved cantilever steel structure square tube on the facade includes S1: firstly carry out in-depth design, combine the designed building structure model and the modeling line form of the double-helix surrounding rising double-twisted curved steel structure on the facade, and use TEKLA software to carry out in-depth design and modeling of the steel structure, and determine the spatial positioning of various embedded nodes, the torsion of the double-helix structure at the four corners of the facade, and the construction method of each node;

[0006] S2: Process the embedded parts and double spiral square tube components. The arc of the arc-shaped embedded plate is customized according to the parameterization of the tekla model. According to the detailed node structure of the tekla model, the steel structure square tube is decomposed into four single-sided parts steel plates. Each single steel plate is bent by a three-center round bending machine according to the corresponding twisting degree, and then the qualified bending parts are twisted by a hydraulic press. After the four-sided parts steel plates are processed, the bottom plate, side plate and cover plate are assembled by the tire membrane frame made by the factory, and finally assembled and welded to form a double twisted bent square tube;

[0007] S3: All the arc-shaped embedded parts in the cylindrical parts are accurately located in space according to the TEKLA model. The arc-shaped embedded plate is a super-large embedded part. It needs to be installed by tower crane after the reinforcement of the civil construction cylinder and beam is tied. After the installation is completed, the formwork construction is carried out. The double-clip anchor-bar embedded parts in the short column and beam parts are installed after the reinforcement of the beam and short column is tied. After the acceptance is qualified, the formwork construction is carried out.

[0008] S4: Select a lifting plan. According to the steel structure model, the concrete structures of the 2nd and 3rd floors of the east facade and the 3rd and 5th floors of the west facade are retracted. The steel components are directly lifted by a car crane and placed at the corresponding retracted positions. Then they are transported to the corresponding installation positions by a trailer and installed by a hand winch. The steel structure components above the sixth floor are located outside the main building and inside the external scaffolding. They need to be lifted and transported to the floors during the main structure construction. The specific innovative optimization process is as follows: optimize and adjust the layout of the construction elevator, adopt the installation style close to the main building, and use an open scaffolding for the elevator. After the corresponding floor formwork support frame is dismantled and before the elevator wall installation rises, the car crane is used to lift the components at the elevator wall section installation position, lift the corresponding components to the floor, and then use a flatbed trailer to transport them to the installation position within the floor;

[0009] S5: Select the model of mobile crane 8 and lift the components. The tonnage of the components on the 2nd to 5th floors is 1.45 tons. The installation location of mobile crane 8 is located on the east and west sides and the north side of the main building. The lifting area is 10m away from the center of the crane, and the lifting height is 19.5m.

[0010] S6: During construction, the cantilevered steel main beam and steel keel side beam are lifted at two points. The lifting points are set at the pre-welded lifting ear connectors. To prevent deformation of the lifting ears during lifting and ensure lifting safety, calculated wire ropes and clamps are used for lifting. This lifting device is connected to the ear plate with ordinary bolts. The wire rope model is Ф17.5㎜6×37, and the tensile strength of this type of wire rope is 1700N / mm 2 , the shackle uses a 6.0 shackle;

[0011] S7: After hoisting the components to the floor, use a flatbed trailer to transport them to the corresponding position within the floor, and then use a hand chain hoist to lift them into place. Then fix the hand chain hoist on the concrete structural beam on the upper floor where the cantilever steel beam is installed. First, drill a hole on each side plate of the concrete structural beam, pass the steel wire rope with a clamp through the hole to hold the structural beam, clip the shackle on the steel wire rope under the concrete beam, hang the hand chain hoist on the shackle, pay attention to adjust the position and height, and use the hand chain hoist for hoisting;

[0012] S8: Then conduct on-site welding. According to the characteristics of on-site welding and the actual project, a welding method combining CO2 flux-cored wire gas shielded welding and electrode manual arc welding is adopted. Before the welding work officially begins, the steel, welding materials, welding methods, welding joint forms and post-weld heat treatment used for the first time in the project must be subjected to welding process qualification tests. For the original welding process qualification test report and the new welding process qualification test report, their test standards, contents and results should be approved by the project supervisor before formal welding work can be carried out. The welding process specifications submitted for approval should include: welding process method, steel grade, steel thickness and its application range;

[0013] S9: After the steel structure cantilever beam is fixed to the embedded plate by welding, in order to prevent the temperature change after welding from causing the embedded plate to shrink and deform, resulting in the edge of the embedded part expanding outward and supporting the concrete protective layer on the side of the embedded plate, a vertical gap with a depth of 3cm and a width of 1-2cm is chiseled on both sides of the embedded part to separate the edges of the embedded plate from the concrete. In addition, the welding interval is extended, and one layer is fired and stopped for 1 hour. After the deformation of the embedded plate is stabilized, the vertical gap is grouted and filled with high-strength grouting material that is one grade higher than the original concrete structure strength.

[0014] S10: After all cantilever steel structure welding is completed, each welding point shall be inspected, including its appearance and non-destructive testing. The visual inspection shall be carried out in accordance with JGJ81-2020. Non-destructive testing shall be carried out in accordance with GB11335 and design documents, with 100% inspection of first-level welds and 20% sampling of second-level welds, and inspection shall be carried out 24 hours after welding.

[0015] Furthermore, in S2, the anchor bars are M18, M25, and M28, with lengths of 300mm, 400mm, 530mm, and 600mm, and the material selected includes but is not limited to Q235B. The anchor plates are -20 and -30 steel plates, and the material selected includes but is not limited to Q355B.

[0016] Furthermore, in S3, the arc-shaped embedded plate has a size of 600×1200×30 mm and weighs about 200 kg.

[0017] Furthermore, in S5, an 80T truck crane 8 is used below the 3rd floor of the building, and a 300T truck crane 8 is used above the 13th floor of the building. The 300T truck crane 8 has a range of 22m, a main arm length of 64.9m, a jib of 24m, an included angle of the main and jibs of 0°, and a rated lifting load of 11.8T, which is greater than the weight of the steel components in this area of ​​2.54T.

[0018] Furthermore, in the S6, the steel wire rope 6 model is Ф17.5㎜6×37, the tensile strength of this steel wire rope model is 1700N / mm2, and the shackle is a No. 6.0 shackle.

[0019] Furthermore, in S7, the cantilevered main steel beam square tube adopts a one-point lifting method and is installed using a manual hoist, with the lifting point located at the center of the component; the cantilevered steel side beam of the steel structure adopts a two-point lifting method and is installed using two manual hoists, with the lifting points located at both ends of the component, and corresponding elevation adjustments are made simultaneously through the hand hoists 5 at both ends.

[0020] The beneficial effects of the present invention are as follows: the arc-shaped embedded parts provided in this construction method can effectively connect and fix the cantilever steel main beam to the main structure column by welding, thereby facilitating the subsequent welding and fixing of the cantilever steel side beam and the cantilever main beam, and the lifting method provided by the hand winch and the automobile crane makes the construction process of the facade cantilever steel structure innovatively adopt the construction method of synchronous interlacing and coordinated lifting and installation during the construction of the concrete main structure, solving the problem that the facade scaffolding and cantilever floor support frame affect the lifting and installation of the cantilever steel structure components of the facade of high-rise buildings during the civil construction process. While improving the processing quality of the facade double-spiral rising double-twisted bending cantilever steel structure, it greatly shortens the construction period of the facade steel structure lifting and installation, and has significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a construction flow chart of the installation method of the double-helix rising double-twisted bending cantilever steel structure square tube on the facade;

[0022] Figure 2 This is a schematic diagram of the structure where the double spiral rising double twisted cantilevered steel structure square tube is installed on the building;

[0023] Figure 3 It is a structural schematic diagram of the cantilever steel main beam 3 welded on the arc embedded parts;

[0024] Figure 4 It is a structural schematic diagram of the hand chain hoist 5 lifting the cantilevered steel beam when there is no cantilevered steel main beam 3 above;

[0025] Figure 5 It is a structural schematic diagram of the cantilevered steel side beam 2 of the upper floor section being lifted by the hand chain hoist 5;

[0026] Figure 6 It is a structural schematic diagram of a cantilever steel beam hand chain hoist 5 lifting a cantilever steel main beam 3 above;

[0027] Figure 7 It is a structural schematic diagram of the cantilevered steel side beam 2 of the downstairs section being lifted by the hand chain hoist 5;

[0028] Figure 8 To provide accurate positioning diagram of the elevation of embedded parts on each layer after in-depth design;

[0029] Fig. 9 The structure of the arc-shaped embedded part 4 in the cylindrical part is shown in FIG. Figure 1 ;

[0030] Fig.10 The structure of the arc-shaped embedded part 4 in the cylindrical part is shown in FIG. Figure 2 ;

[0031] Fig.11 The structure of the arc-shaped embedded part 4 in the cylindrical part is shown in FIG. Figure 3 ;

[0032] Fig.12 The structural diagram of the buried plate in the short column and beam position Figure 1 ;

[0033] Fig.13 The structural diagram of the buried plate in the short column and beam position Figure 2 ;

[0034] Fig.14 Layout of the crane stop points;

[0035] Fig.15 It is the layout drawing of component lifting conditions;

[0036] Fig.16 Structural diagram of the hoisting condition of steel components above six floors Figure 1 ;

[0037] Fig.17 Structural diagram of the hoisting condition of steel components above six floors Figure 2 ;

[0038] Fig.18 This is a schematic diagram of the welding of the cantilever steel beam and the buried plate;

[0039] Fig.19 Schematic diagram of measures to prevent shrinkage and deformation.

[0040] In the figure: 1 building body, 11 column, 12 welding part, 121 vertical gap, 2 cantilever steel side beam, 3 cantilever steel main beam, 4 arc-shaped embedded parts, 41 arc-shaped steel plate, 42 supporting steel bars, 5 hand hoist, 6 steel wire rope, 7 double-clip anchor embedded parts, 8 truck crane. DETAILED DESCRIPTION

[0041] The following is a further detailed description of the twisted large-span steel structure roof truss hoisting construction method of the present invention in conjunction with the accompanying drawings and specific embodiments:

[0042] Reference Figure 1-19 , Step 1, use Tekla software to build a model of the exterior steel structure of the building 1, refer to the model data, accurately produce and process the arc-shaped embedded parts 4, and accurately position and place the embedded parts during the construction of the concrete main structure.

[0043] Step 2: The double-twisted square tube components at the corner arc parts of the exterior facade are decomposed into four steel plates according to the detailed node structure of the Tekla model. Each steel plate is a corresponding twisted arc-shaped buried plate 41. The membrane frame template is then made in the factory, and the four steel plates are assembled and welded to form a double-twisted square tube. Multiple supporting steel bars 42 are welded on one side of the arc-shaped buried plate 41 for welding to the column 11 of the building 1.

[0044] Step 2: There is continuous retreat of the main body 2-5 floors, and the processed steel components are directly hoisted to the retreating position of the corresponding floor; the steel structure components above the 6th floor are located outside the main building and inside the external scaffolding, and are hoisted into the floor during the main structure construction process. The details are as follows: the elevator is installed in the style of being attached to the main building, and the scaffolding at the elevator position is an open scaffolding. After the corresponding floor formwork support frame is dismantled and before the elevator wall installation rises, the automobile crane 8 is used to hoist the components at the elevator wall section installation position, and the corresponding components are hoisted into the floor, and then a flatbed trailer is used to transport them from the floor to the installation position.

[0045] Step 3: The cantilever steel main beam 3 is hoisted and spatially positioned by a single hand chain hoist 5. After the cantilever steel main beam 3 is installed, the cantilever steel side beam 2 is installed. The cantilever steel side beam 2 is connected to the corresponding cantilever steel main beam 3 by welding the cantilever steel main beam 3 with the hand chain hoists 5 at both ends to adjust the elevation of the connection points at both ends.

[0046] In the present invention, tekla software is used to establish a model of the facade steel structure according to the drawing requirements and the actual working conditions on site, and the model data is referred to to guide the precise positioning of the embedded parts, the processing and installation of the components, and the embedded accuracy and construction and installation deviation are pre-controlled in advance.

[0047] Moreover, the square steel tubes at the four corners of the facade are double-helix rising double-twisted bending special-shaped components, and the curvatures are different. According to the detailed node structure of the tekla model, the frame square tube is decomposed into four steel plates, each of which is a corresponding twisted arc-shaped buried plate. Then the factory makes a membrane frame sample, and the four steel plates are spliced ​​and welded to form a double-twisted bending special-shaped square steel tube component. The process is complex and requires high processing precision, which has guiding significance for the processing of similar special-shaped double-twisted bending steel structure components.

[0048] In addition, the steel structure components are located outside the main building and inside the external scaffolding. In order to facilitate the lifting of the components to the floors, the layout of the elevator is optimized and adjusted, and the installation style close to the main building is adopted. The scaffolding at the elevator is an open scaffolding. After the corresponding floor formwork support frame is dismantled and before the elevator is installed on the wall, the lifting of the components is reasonably inserted. At this location, the corresponding components are lifted by a crane to the floor, and then a flatbed trailer is used to transport them to the installation location within the floor for component installation. This lifting method has little impact on the construction of other processes and saves construction time.

[0049] At the same time, the cantilever steel main beam 3 is hoisted and spatially positioned by a single hand winch 5, and the cantilever steel side beam 2 is installed after the cantilever steel main beam 3 is installed. The oblique straight section and the arc section of the cantilever steel side beam 2 are adjusted to the elevation of the connection points at both ends by hand winches 5 at both ends, and then welded to the corresponding cantilever steel main beam 3, and a vertical gap 121 with a depth of 3cm and a width of 2cm is chiseled on both sides of the embedded parts in the welding part 12 to separate the edges of the embedded plate from the concrete. In addition, the welding interval is extended, and one layer is burned for 1 hour. This can effectively prevent the temperature from being too high and causing high-temperature damage. After the deformation of the embedded plate is stabilized, the vertical gap is grouted and filled with a high-strength grouting material that is one grade higher than the original concrete structure strength.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. The installation and construction method of the double spiral rising double twist bending cantilever steel structure square tube on the facade is characterized by: The following steps are involved: S1: First, carry out in-depth design. Combined with the designed building 1 structural model and the facade double-helix surrounding rising double-twisted curved steel structure modeling line model, the steel structure is in-depth designed and modeled using TEKLA software to determine the spatial positioning of various embedded nodes, the torsion of the double-helix structure at the four corners of the facade, and the construction methods of each node; S2: Process the embedded parts and double spiral square tube components. The arc of the arc-shaped embedded plate 41 is customized according to the parameterization of the TEKLA model. According to the detailed node structure of the TEKLA model, the steel structure square tube is decomposed into four single-sided parts steel plates. Each single steel plate is bent by a three-center round bending machine according to the corresponding twisting degree, and then the parts plate that meet the bending requirements are twisted by a hydraulic press. After the four-sided parts steel plates are processed, the bottom plate, side plate and cover plate are assembled by the tire membrane frame made in the factory, and finally assembled and welded to form a double twisted bent square tube. A plurality of anchor bars 42 are welded on one side of the arc-shaped embedded plate 41; S3: All the arc-shaped embedded parts 4 of the cylindrical parts are accurately located in the spatial position of the embedded parts according to the TEKLA model. The arc-shaped embedded plate 41 is an ultra-large embedded part. It needs to be installed by tower crane after the reinforcement of the civil construction cylinder and beam is tied. After the installation is completed, the formwork construction is carried out. The double-clip anchor-bar embedded parts 7 of the short column and beam parts are installed after the reinforcement of the beam and short column is tied. After the acceptance is qualified, the formwork construction is carried out; S4: Select a lifting plan. According to the steel structure model, the concrete structures of the 2nd and 3rd floors of the east facade and the 3rd and 5th floors of the west facade are retracted. The steel components are directly lifted by a car crane and placed at the corresponding retracted positions. Then they are transported to the corresponding installation positions by a trailer and installed by a hand winch. The steel structure components above the sixth floor are located outside the main building and inside the external scaffolding. They need to be lifted and transported to the floors during the main structure construction. The specific innovative optimization process is as follows: optimize and adjust the layout of the construction elevator, adopt the installation style close to the main building, and use an open scaffolding for the elevator. After the corresponding floor formwork support frame is dismantled and before the elevator wall installation rises, the car crane is used to lift the components at the elevator wall section installation position, lift the corresponding components to the floor, and then use a flatbed trailer to transport them to the installation position within the floor; S5: Select the model of mobile crane 8 and lift the components. The tonnage of the components on the 2nd to 5th floors is 1.45 tons. The installation location of mobile crane 8 is located on the east and west sides and the north side of the main building. The lifting area is 10m away from the center of the crane, and the lifting height is 19.5m. S6: During construction, the cantilevered steel main beam 3 and the steel keel side beam are lifted at two points. The lifting points are set at the pre-welded lifting ear connectors. To prevent deformation of the lifting ears during lifting and ensure lifting safety, calculated steel wire ropes 6 and clamps are used for lifting. This lifting device is connected to the ear plate with ordinary bolts. The steel wire rope 6 model is Ф17.5㎜6×37, and the tensile strength of this type of steel wire rope 6 is 1700N / mm 2 , the shackle uses a 6.0 shackle; S7: After the component is hoisted to the floor, a flatbed trailer is used to transport it to the corresponding position within the floor, and then the hand chain hoist 5 is used to lift it into place, and then the hand chain hoist 5 is fixed on the concrete structural beam on the upper layer of the cantilever steel beam installation position. First, a hole is drilled on each side plate of the concrete structural beam, and the steel wire rope 6 with a clamp ring is passed through the hole to hold the structural beam. A shackle is clamped on the steel wire rope 6 under the concrete beam, and the hand chain hoist 5 is hung on the shackle. Pay attention to adjusting the position and height, and use the hand chain hoist 5 for hoisting; S8: Then conduct on-site welding. According to the characteristics of on-site welding and the actual project, a welding method combining CO2 flux-cored wire gas shielded welding and electrode manual arc welding is adopted. Before the welding work officially begins, the steel, welding materials, welding methods, welding joint forms and post-weld heat treatment used for the first time in the project must be subjected to welding process qualification tests. For the original welding process qualification test report and the new welding process qualification test report, their test standards, contents and results should be approved by the project supervisor before formal welding work can be carried out. The welding process specifications submitted for approval should include: welding process method, steel grade, steel thickness and its application range; S9: After the steel structure cantilever beam is fixed to the embedded plate by welding, in order to prevent the embedded plate from shrinking and deforming due to temperature changes after welding, resulting in the edge of the embedded part expanding outward and supporting the concrete protective layer on the side of the embedded plate, a vertical gap of 3cm in depth and 1-2cm in width is chiseled on both sides of the embedded part to separate the edges of the embedded plate from the concrete. In addition, the welding interval is extended, and one layer is fired and stopped for 1 hour. After the deformation of the embedded plate is stabilized, the vertical gap is grouted and filled with high-strength grouting material that is one grade higher than the original concrete structure strength; S10: After all the cantilever steel structure welding is completed, each welding point shall be inspected, including its appearance and non-destructive testing. The visual inspection shall be carried out in accordance with JGJ81-2020 specification, and the non-destructive testing shall be carried out in accordance with GB11335 and design documents. The first-level welds shall be 100% inspected, and the second-level welds shall be randomly inspected by 20%, and the inspection shall be carried out 24 hours after welding.

2. The installation construction method of the double-spiral rising double-twisted cantilever steel structure square tube of the facade according to claim 1 is characterized in that: In S2, the anchor bar 42 is M18, M25, M28, with a length of 300mm, 400mm, 530mm, 600mm, and the material selected is one including but not limited to Q235B. The anchor plate uses -20, -30 steel plate, and the material selected is one including but not limited to Q355B.

3. The installation construction method of the double-spiral rising double-twisted cantilever steel structure square tube of the facade according to claim 1 is characterized in that: In the above-mentioned S3, the size of the arc-shaped buried plate 41 is 600×1200×30 mm, and the weight is about 200 kg.

4. The installation construction method of the double-spiral rising double-twisted bending cantilever steel structure square tube of the facade according to claim 1 is characterized in that: In S5, the mobile crane 8 has an amplitude of 14m, a main arm length of 50m, a jib of 17.5m, a working elevation angle of 80°, an included angle between the main arm and the jib of 0°, and a rated lifting load of 4.0T, which is greater than the weight of the steel components in the area of ​​1.45T. The tonnage of the ladder components above the 6th floor is 2.8T. The mobile crane 8 is located on the west side of the main building. The lifting area is 22m away from the center of the crane, and the lifting height is 73.4m.

5. The installation construction method of the double-spiral rising double-twisted bending cantilever steel structure square tube of the facade according to claim 1 is characterized in that: In S5, an 80T truck crane 8 is used below the 13th floor of the building, and a 300T truck crane 8 is used above the 113th floor of the building. The 300T truck crane 8 has a range of 22m, a main arm length of 64.9m, a jib of 24m, an included angle of 0°, and a rated lifting load of 11.8T, which is greater than the weight of the steel structure in this area of ​​2.54T.

6. The installation construction method of the double-spiral rising double-twisted bending cantilever steel structure square tube of the facade according to claim 1 is characterized in that: In the S6, the steel wire rope 6 is of Ф17.5㎜6×37, the tensile strength of which is 1700N / mm2, and the shackle is of No. 6.

0.

7. The method for installing and constructing the double-spiral rising double-twisted cantilevered steel structure square tube according to claim 1 is characterized in that: In S7, the cantilevered main steel beam square tube adopts a one-point lifting method and is installed using a manual hoist, with the lifting point located at the center of the component. The cantilevered steel side beam 2 of the steel structure adopts a two-point lifting method and is installed using two manual hoists, with the lifting points located at both ends of the component. At the same time, the corresponding elevation adjustment is performed through the hand hoists 5 at both ends.

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