Construction method of large-span cantilever steel support

Abstract

The invention discloses a construction method of a large-span cantilever steel support. The construction method comprises the following steps that S1, embedded iron parts of various components are arranged on a concrete structure; s2, steel corbels are mounted on the concrete structure through the embedded parts; s3, the cantilever steel supports welded into the group are hoisted to the installation position; s4, after the cantilever steel support is installed on the steel corbel, the cantilever steel support is connected with an embedded part on the concrete structure; s5, the direction of a vertical inclined strut on the cantilever steel support is adjusted, and the vertical inclined strut and an embedded part on the concrete structure are welded together; and S6, horizontal supports are welded to the left side and the right side of the cantilever steel support. According to the construction method, the whole cantilever support is hoisted in place and welded together, the whole hoisting construction is downward welding and vertical welding, high-altitude overhead welding does not exist, the quality of welding seams is greatly guaranteed, and the reliability of the structure is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cantilever steel brackets, and in particular relates to a construction method of a large-span cantilever steel bracket. Background Art

[0002] The cantilever steel bracket installed on the concrete structure is the supporting point of the steel structure in the air. Its performance plays a vital role in the normal and safe use of the entire steel structure. The correctness of the installation and construction method of the cantilever steel bracket is the decisive factor in whether the bracket can reach the predetermined design strength, whether the bracket can be accurately installed to the predetermined position, and whether it can provide reliable support for the steel structure.

[0003] At present, the traditional construction method is mostly to bury embedded iron parts in the concrete structure in advance when pouring concrete, then weld the steel beams and steel braces into components on site, and then use a crane to lift the components to the installation location, weld the components and embedded iron parts together through high-altitude welding operations, and finally directly lift and install the structure supported by the cantilever steel bracket into place;

[0004] However, the applicant found that the current construction method has safety hazards and low construction efficiency. For example, after the components are hoisted into place, there are no temporary fixed nodes. When the components and embedded iron parts are welded, the vertical constraints are entirely dependent on the crane. When encountering slight disturbances such as sudden wind, it is difficult to ensure the welding quality of the nodes, and there may even be safety hazards of insufficient weld strength. In addition, the beams and diagonal braces are welded into groups on the ground in advance. After being hoisted into place, the ends of the beams and diagonal braces may not be able to contact the embedded iron parts at the same time due to errors in the cutting of steel structures and construction errors of embedded iron parts on concrete structures. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a construction method for a large-span cantilever steel support. The technical improvements are made to the original cantilever steel support, including the node structure and installation sequence of the steel support. The entire cantilever support is hoisted into place and welded together. The entire hoisting construction is downward welding and vertical welding, and there is no high-altitude overhead welding, which greatly guarantees the quality of the weld and improves the reliability of the structure. At the same time, it can effectively resist slight disturbances caused by wind loads during construction, increase the construction tolerance, reduce the technical requirements on site, reduce the construction time, and reduce the construction cost.

[0006] The object of the present invention is achieved through the following technical solutions:

[0007] A construction method for a large-span cantilever steel support comprises the following steps:

[0008] Step S1, arranging embedded iron parts of various components on the concrete structure;

[0009] Step S2, installing steel brackets on the concrete structure using embedded parts;

[0010] Step S3, hoisting the welded cantilever steel bracket to the installation position;

[0011] Step S4, installing the cantilever steel bracket on the steel bracket and connecting it to the embedded parts on the concrete structure;

[0012] Step S5, adjusting the direction of the vertical diagonal brace on the cantilever steel support, and welding it to the embedded parts on the concrete structure;

[0013] Step S6: Weld horizontal supports on the left and right sides of the cantilever steel support.

[0014] In one embodiment, step S1 includes:

[0015] Steel corbels, beam connecting plates, vertical braces and horizontal braces are embedded in the concrete structure in advance.

[0016] In one embodiment, step S2 includes:

[0017] Weld the steel corbel to the steel corbel embedded iron parts.

[0018] In one embodiment, step S3 includes:

[0019] Step S301, welding the upper pad plate of the diagonal brace, the upper limiting plate of the diagonal brace and the upper connecting plate of the diagonal brace to form a vertical upper assembly of the diagonal brace;

[0020] Step S302, welding the lower connecting plate of the diagonal brace and the lower limiting plate of the diagonal brace to form a lower assembly of the diagonal brace;

[0021] Step S303, connecting the steel beam and the vertical diagonal brace through the vertical diagonal brace upper assembly;

[0022] Step S304, installing the lower assembly of the vertical diagonal brace below the vertical diagonal brace;

[0023] Wherein, the upper component of the vertical diagonal brace and the lower component of the vertical diagonal brace are both provided with threaded holes for the vertical diagonal brace to rotate.

[0024] In one embodiment, in step S304, it further includes:

[0025] A long hole penetrating to the bottom of the lower end is provided in the plane direction of the lower end of the vertical diagonal brace, and a long hole not penetrating to the bottom of the lower end is provided in the plane direction, so that the lower component of the vertical diagonal brace can move vertically along it.

[0026] In one embodiment, step S4 includes:

[0027] First place the steel beam on the steel corbel, then weld the steel beam and the steel corbel together, and then weld the beam connecting plate, the beam connecting plate embedded iron parts and the steel beam together.

[0028] In one embodiment, step S5 includes:

[0029] The vertical diagonal brace is rotated around the threaded hole of the vertical diagonal brace upper component, so that the diagonal brace lower component is in contact with the vertical diagonal brace embedded iron parts and a weld is applied, and the vertical diagonal brace is welded together with the vertical diagonal brace upper component and the vertical diagonal brace lower component.

[0030] In one embodiment, step S3 further includes:

[0031] Step S305: When hoisting the cantilever steel support to the installation position, a crane lifting point is set along one quarter of the steel beam so that the center of gravity of the cantilever steel support coincides with the center of the crane hook.

[0032] In one embodiment, step S4 further includes:

[0033] Place the beam connecting plate on the steel beam so that the beam connecting plate and the embedded iron parts of the beam connecting plate are in stable contact, and weld the fillet welds between the three by downward welding.

[0034] In one embodiment, step S5 further includes:

[0035] Weld the welds at the contact between the vertical diagonal brace and the upper connecting plate of the vertical diagonal brace and the lower connecting plate of the vertical diagonal brace, and at the same time, seal the gaps of the long holes opened in the plane of the upper part of the vertical diagonal brace and the long holes opened outside the plane and in the plane of the lower part of the vertical diagonal brace by welding.

[0036] The beneficial effects of the present invention are:

[0037] (1) After adding steel brackets, the friction generated by the contact between the deadweight of the steel beam and the steel bracket can effectively resist the slight disturbance caused by the wind load during construction, ensuring the quality of the beam welding construction; at the same time, the entire hoisting construction is all downward welding and vertical welding, without high-altitude overhead welding, and the quality of the weld is greatly guaranteed;

[0038] (2) The entire cantilever steel support is made by cutting and laying out in the factory, which ensures the accuracy of the cantilever support size. There is no need to lay out and position it again on site, and it can be directly hoisted and welded. The technical requirements on site are low, which greatly increases the speed of construction.

[0039] (3) By adding a crossbeam connecting plate, after the crossbeam connecting plate is welded, the structure can bear its own gravity load. The subsequent installation construction does not require a crane to hang the cantilever bracket, which reduces the use time and turnover cycle of the crane, improves the use efficiency of the crane, shortens the crane rental time and reduces costs;

[0040] (4) By installing the upper and lower components of the vertical diagonal brace on the horizontal beam and the vertical diagonal brace in advance, and utilizing the characteristics of the upper component of the vertical diagonal brace rotating around the bolts and the lower component of the vertical diagonal brace sliding along the vertical diagonal brace, the errors caused by inaccurate positioning of the embedded iron parts and inaccurate material cutting are adjusted, thereby avoiding the risk of repeatedly modifying the components and repeatedly hoisting the components due to the misalignment of the embedded iron parts after the vertical diagonal brace is welded in advance and then hoisted to the installation position. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0042] Figure 1 A schematic diagram showing the completion of the cantilever steel support construction in the prior art is shown;

[0043] Figure 2 A schematic diagram showing the embedded iron parts of various components arranged on a concrete structure according to the present invention;

[0044] Figure 3 A schematic diagram showing the installation of a steel corbel on a concrete structure according to the present invention is shown;

[0045] Figure 4 A schematic diagram showing the present invention of hoisting a cantilever steel support to an installation position;

[0046] Figure 5 A schematic diagram showing the installation of a cantilever steel bracket on a steel corbel according to the present invention is shown;

[0047] Figure 6 A schematic diagram showing the present invention of adjusting the direction of a vertical diagonal brace and connecting it to a concrete structure;

[0048] Figure 7 A schematic diagram showing the present invention of welding horizontal supports on the left and right sides of a cantilever steel support;

[0049] Figure 8 A schematic diagram showing the present invention of hoisting and installing a steel structure in place;

[0050] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0051] Reference numerals:

[0052] 101-concrete structure, 201-steel crossbeam, 202-stiffening ribs, 203-steel corbels, 204-steel corbels embedded iron parts, 205-crossbeam connecting plates, 206-crossbeam connecting plates embedded iron parts, 301-horizontal diagonal brace, 302-horizontal diagonal brace embedded iron parts, 401-vertical diagonal brace, 402-vertical diagonal brace embedded iron parts, 403-diagonal brace lower connecting plate, 404-diagonal brace lower limiting plate, 405-diagonal brace upper pad, 406-diagonal brace upper limiting plate, 407-diagonal brace upper connecting plate, 408-bolts, 501-crane, 601-supported steel structure. DETAILED DESCRIPTION

[0053] The present invention will be further described below in conjunction with the accompanying drawings.

[0054] like Figure 1 As shown, it shows a schematic diagram after the cantilever steel bracket construction in the prior art is completed. When pouring concrete, embedded iron parts are buried in advance on the concrete structure, and then the steel beams and steel braces are welded into components on site, and then the components are hoisted to the installation position by a crane, and the components and embedded iron parts are welded together through high-altitude welding operations. Finally, the structure supported by the cantilever steel bracket is directly hoisted and installed in place. However, the applicant has found that the current construction method has safety hazards and low construction efficiency. For example, after the hoisting components are in place, there are no temporary fixed nodes. When the components and embedded iron parts are welded, the crane is relied on to provide vertical constraints. When encountering slight disturbances such as sudden wind, it is difficult to ensure the welding quality of the nodes, and there may even be safety hazards of insufficient weld strength. In addition, the beams and braces are welded into groups on the ground in advance. After hoisting into place, the ends of the beams and the braces may not be in contact with the embedded iron parts at the same time due to errors in the blanking of the steel structure and construction errors of the embedded iron parts on the concrete structure.

[0055] The present invention provides a construction method for a large-span cantilever steel support, such as Figures 2 to 8 As shown,

[0056] The steps include:

[0057] Step S1, arranging embedded iron parts of various components on the concrete structure;

[0058] Step S2, installing steel brackets on the concrete structure using embedded parts;

[0059] Step S3, hoisting the welded cantilever steel bracket to the installation position;

[0060] Step S4, installing the cantilever steel bracket on the steel bracket and connecting it with the embedded parts on the concrete;

[0061] Step S5, adjusting the direction of the vertical diagonal brace on the cantilever steel support, and welding it to the embedded parts on the concrete structure;

[0062] Step S6, welding horizontal supports on the left and right sides of the cantilever steel support;

[0063] It should be noted that if Figure 2 As shown, step S1 includes:

[0064] Pre-embed steel brackets, beam connection plates, vertical braces, and horizontal braces on the concrete structure;

[0065] like Figure 3 As shown, step S2 includes:

[0066] Weld the steel corbel to the steel corbel embedded iron parts;

[0067] like Figure 4 As shown, step S3 includes:

[0068] Step S301, welding the upper pad plate of the diagonal brace, the upper limiting plate of the diagonal brace and the upper connecting plate of the diagonal brace to form a vertical upper assembly of the diagonal brace;

[0069] Step S302, welding the lower connecting plate of the diagonal brace and the lower limiting plate of the diagonal brace to form a lower assembly of the diagonal brace;

[0070] Step S303, connecting the steel beam and the vertical diagonal brace through the vertical diagonal brace upper assembly;

[0071] Step S304, installing the lower assembly of the vertical diagonal brace below the vertical diagonal brace;

[0072] Step S305: in the process of hoisting the cantilever steel support to the installation position, a crane hoisting point is set along one quarter of the steel beam so that the center of gravity of the cantilever steel support coincides with the center of the crane hook;

[0073] Wherein, the upper component of the vertical diagonal brace and the lower component of the vertical diagonal brace are both provided with threaded holes for the vertical diagonal brace to rotate;

[0074] like Figure 5 As shown, step S4 includes:

[0075] First, place the steel beam on the steel bracket, then weld the steel beam and the steel bracket together, and then weld the beam connecting plate, the embedded iron parts of the beam connecting plate and the steel beam together;

[0076] Specifically, the cross beam connecting plate is placed on the steel cross beam, so that the cross beam connecting plate and the embedded iron parts of the cross beam connecting plate are stably contacted, and the fillet weld between the three is welded by a downward welding method;

[0077] like Figure 6 As shown, step S5 includes:

[0078] Rotate the vertical diagonal brace around the threaded hole of the vertical diagonal brace upper component, so that the diagonal brace lower component and the vertical diagonal brace embedded iron parts are in contact and welded together, and weld the vertical diagonal brace with the vertical diagonal brace upper component and the vertical diagonal brace lower component;

[0079] Furthermore, if Figure 7 As shown, the welds at the contact points between the vertical diagonal brace and the upper connecting plate of the vertical diagonal brace and the lower connecting plate of the vertical diagonal brace are welded, and at the same time, the long holes opened in the plane of the upper part of the vertical diagonal brace and the long holes opened outside the plane and in the plane of the lower part of the vertical diagonal brace are welded to fill the gaps;

[0080] like Figure 8 As shown, finally, the steel structure supported by the cantilever steel bracket is hoisted and installed in place;

[0081] It should be noted that, in this embodiment, by adding steel brackets and the friction generated by the contact between the deadweight of the steel beam and the steel brackets, the slight disturbance caused by the wind load during construction can be effectively resisted, thereby ensuring the quality of the beam welding construction. At the same time, the entire hoisting construction is performed by downward welding and vertical welding, and there is no high-altitude overhead welding, so the quality of the weld is greatly guaranteed; at the same time, the entire cantilever steel bracket is made by factory layout and cutting, which ensures the accuracy of the cantilever bracket size. There is no need to layout and position again on site, and it can be directly hoisted and welded, which has low technical requirements on site and greatly increases the construction speed accordingly; by adding a crossbeam connecting plate, after the crossbeam connecting plate is welded, the structure can bear its own gravity load, and the subsequent installation construction does not require a crane to hang the cantilever bracket, which reduces the use time and turnover cycle of the crane, improves the use efficiency of the crane, shortens the crane rental time and reduces costs;

[0082] At the same time, by installing the upper and lower components of the vertical diagonal brace on the crossbeam and the vertical diagonal brace in advance, the errors caused by the inaccurate position of the embedded iron parts and the inaccurate material feeding are adjusted by utilizing the characteristics of the upper component of the vertical diagonal brace rotating around the bolts and the lower component of the vertical diagonal brace sliding along the vertical diagonal brace, thereby avoiding the risk of repeatedly modifying the components and repeatedly hoisting the components due to the misalignment of the embedded iron parts after the vertical diagonal brace is welded in advance and then hoisted to the installation position;

[0083] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0084] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A construction method for a large-span cantilever steel support, characterized in that: The steps include: Step S1, arranging embedded iron parts of various components on the concrete structure; Step S2, installing steel brackets on the concrete structure using embedded parts; Step S3, hoisting the welded cantilever steel bracket to the installation position; Step S4, installing the cantilever steel bracket on the steel bracket and connecting it to the embedded parts on the concrete structure; Step S5, adjusting the direction of the vertical diagonal brace on the cantilever steel support, and welding it to the embedded parts on the concrete structure; Step S6: Weld horizontal supports on the left and right sides of the cantilever steel support.

2. The construction method of a large-span cantilever steel support according to claim 1 is characterized in that: Step S1 includes: Steel corbels, beam connecting plates, vertical braces and horizontal braces are embedded in the concrete structure in advance.

3. The construction method of a large-span cantilever steel support according to claim 2 is characterized in that: Step S2 includes: Weld the steel corbel to the steel corbel embedded iron parts.

4. The construction method of a large-span cantilever steel support according to claim 3 is characterized in that: Step S3 includes: Step S301, welding the upper pad plate of the diagonal brace, the upper limiting plate of the diagonal brace and the upper connecting plate of the diagonal brace to form a vertical upper assembly of the diagonal brace; Step S302, welding the lower connecting plate of the diagonal brace and the lower limiting plate of the diagonal brace to form a lower assembly of the diagonal brace; Step S303, connecting the steel beam and the vertical diagonal brace through the vertical diagonal brace upper assembly; Step S304, installing the lower assembly of the vertical diagonal brace below the vertical diagonal brace; Wherein, the upper component of the vertical diagonal brace and the lower component of the vertical diagonal brace are both provided with threaded holes for the vertical diagonal brace to rotate.

5. The construction method of a large-span cantilever steel support according to claim 4 is characterized in that: In step S304, it also includes: A long hole penetrating to the bottom of the lower end is provided in the plane direction of the lower end of the vertical diagonal brace, and a long hole not penetrating to the bottom of the lower end is provided in the plane direction, so that the lower component of the vertical diagonal brace can move vertically along it.

6. The construction method of a large-span cantilever steel support according to claim 5 is characterized in that: Step S4 includes: First place the steel beam on the steel corbel, then weld the steel beam and the steel corbel together, and then weld the beam connecting plate, the beam connecting plate embedded iron parts and the steel beam together.

7. The construction method of a large-span cantilever steel support according to claim 6 is characterized in that: Step S5 includes: The vertical diagonal brace is rotated around the threaded hole of the vertical diagonal brace upper component, so that the diagonal brace lower component is in contact with the vertical diagonal brace embedded iron parts and a weld is applied, and the vertical diagonal brace is welded together with the vertical diagonal brace upper component and the vertical diagonal brace lower component.

8. The construction method of a large-span cantilever steel support according to claim 4 is characterized in that: Step S3 also includes: Step S305: When hoisting the cantilever steel support to the installation position, a crane lifting point is set along one quarter of the steel beam so that the center of gravity of the cantilever steel support coincides with the center of the crane hook.

9. The construction method of a large-span cantilever steel support according to claim 5, characterized in that: Step S4 also includes: Place the beam connecting plate on the steel beam so that the beam connecting plate and the embedded iron parts of the beam connecting plate are in stable contact, and weld the fillet welds between the three by downward welding.

10. The construction method of a large-span cantilever steel support according to claim 7, characterized in that: Step S5 also includes: Weld the welds at the contact between the vertical diagonal brace and the upper connecting plate of the vertical diagonal brace and the lower connecting plate of the vertical diagonal brace, and at the same time, seal the gaps of the long holes opened in the plane of the upper part of the vertical diagonal brace and the long holes opened outside the plane and in the plane of the lower part of the vertical diagonal brace by welding.

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