High-altitude large-span cantilever base

Abstract

The utility model provides a high-altitude large-span cantilever base. The high-altitude large-span cantilever base comprises a bottom-layer transverse frame and a profile steel base. The bottom-layer transverse frame comprises a plurality of steel trusses; the multiple steel trusses are distributed in the length direction of the building bodies on the two sides to form counter weight frame bodies and stress frame bodies, and the number of the steel trusses of the stress frame bodies is larger than the number of the steel trusses of the counter weight frame bodies. The profile steel base comprises a plurality of profile steels, and each profile steel is longitudinally lapped on the plurality of steel trusses and extends to the outside of the stress frame body in an overhanging manner; and a formwork support is connected among the plurality of steel trusses through anti-slip devices. According to the formwork supporting system, the supporting points at the two ends are connected through the steel truss, the profile steel serves as a cantilever structure base, meanwhile, the fastener type steel pipe scaffold serves as a formwork supporting frame, and the formwork supporting system of the base-free cantilever structure is formed. The problems that a floor scaffold cannot be adopted, and the length of a traditional cantilever structure is limited are solved. The structure is stable, safe and reliable, and the economic cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of high-altitude large-span cantilever building construction, and in particular to a high-altitude large-span cantilever base. Background Art

[0002] Nowadays, with the improvement of aesthetics, the public has higher and higher requirements for the appearance of buildings, and various shapes on the upper part of high-rise buildings have emerged. Figure 1 As shown in the figure, the building 300 is usually a high-altitude large-span building without support and attachment points. During the construction of the high-altitude building, the maximum span relative to the roof cantilever structure 500 may be greater than 10m, and the height of the construction work from the ground may be greater than 100m, so it is impossible to use conventional cantilever steel scaffolding for construction. Affected by the span and cantilever structure, the existing cantilever steel scaffolding has a large deadweight and is difficult to disassemble and assemble, resulting in restrictions on the working height and working size; due to its weak bearing capacity, the construction safety factor is low; and because it cannot be used repeatedly, the construction cost increases. Utility Model Content

[0003] The present application provides a high-altitude large-span cantilever base, which has the advantages of light weight, high rigidity, stable support, strong bearing capacity, flexible turnover application, and saving of materials and labor costs.

[0004] The present application provides a high-altitude large-span cantilever base, which includes a bottom cross frame assembled between two side buildings, and a steel base detachably fixedly connected to the bottom cross frame;

[0005] The bottom horizontal frame includes a plurality of steel trusses;

[0006] The plurality of steel trusses are distributed as a counterweight frame and a force-bearing frame along the length direction of the building bodies on both sides, and the number of steel trusses of the force-bearing frame is greater than the number of steel trusses of the counterweight frame;

[0007] The steel base includes a plurality of steel sections, each of which is longitudinally overlapped on the plurality of steel trusses and cantilevered to extend to the outside of the load-bearing frame;

[0008] The plurality of steel trusses are connected with formwork frames via anti-slip devices.

[0009] In this application, the support points at both ends are connected by steel trusses, and the steel section is used as the base of the cantilever structure to form a template support system for the baseless cantilever structure. It solves the problem of high-altitude support-free structure construction where ground-based scaffolding cannot be used and the length of traditional cantilever structures is limited. It has the advantages of stable, safe and reliable structure and economic cost saving. It meets the needs of modeling construction of the upper part of high-rise buildings and provides a construction scaffold for a high-altitude large-span building system without supports and attachment points. It avoids the influence of span and cantilever structure; has strong bearing capacity and high construction safety factor; and can be used repeatedly.

[0010] In a specific possible implementation scheme, steel plates are pre-buried on the building bodies on both sides;

[0011] The bottom of each steel truss is welded to the steel plates on both sides. The embedded steel plates can effectively ensure effective contact surfaces during installation.

[0012] In a specific feasible implementation scheme, each steel truss is a prefabricated frame. It is prefabricated in the factory and the installation of the entire base is completed by hoisting, which is simple and convenient to disassemble and assemble.

[0013] In a specific possible implementation scheme, each steel truss is welded with columns at intervals inside, and a reinforcing diagonal brace is welded between two adjacent columns to increase the overall support strength of the steel truss.

[0014] In a specific implementation scheme, the distance between any two adjacent steel trusses on the counterweight frame is greater than the distance between any two adjacent steel trusses on the load-bearing frame. The load-bearing capacity of the load-bearing frame is greater than the strength of the counterweight frame, thereby ensuring the strength of the cantilever.

[0015] In a specific implementation scheme, the number of the plurality of steel trusses is five, seven or nine. Optional installation is performed according to different working conditions and environments, and operation is flexible.

[0016] In a specific implementation scheme, when the number of the plurality of steel trusses is five, the number of steel trusses on the counterweight frame is two, and the number of steel trusses on the load-bearing frame is three. The density of the steel trusses of the load-bearing frame is greater than the density of the steel trusses of the counterweight frame.

[0017] In a specific possible implementation scheme, each of the steel sections is an I-beam placed vertically, and the I-beam and the plurality of steel trusses are perpendicular to each other. The supporting strength is reliable.

[0018] In a specific possible implementation mode, each of the I-beams is detachably fixedly connected to the steel truss of the counterweight frame through a bolt assembly, which is convenient for assembly and disassembly.

[0019] In a specific possible implementation scheme, both sides of the facade of each steel truss are connected to the corresponding building body through inclined fixed channel steels, thereby enhancing the strength of the steel truss installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a roof cantilever structure in the prior art;

[0021] Figure 2 A schematic diagram of the structure of a high-altitude large-span cantilever base provided in an embodiment of the present application from a first perspective;

[0022] Figure 3 A second perspective structural schematic diagram of a high altitude large span cantilever base provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the structure of a steel truss provided in an embodiment of the present application;

[0024] Figure 5 A side view of the high-altitude, large-span cantilevered base provided in an embodiment of the present application.

[0025] Figure Number:

[0026] Counterweight frame -100, reinforced diagonal brace -101, column -102, fixed channel steel -103, load-bearing frame -110, steel base -200, bolt assembly -201, building body -300, steel plate -301, formwork frame -400, roof cantilever structure -500. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0028] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] In order to facilitate understanding of the high-altitude large-span cantilevered base provided in the embodiment of the present application, its application scenario is first explained. First of all, it needs to be specifically explained that the high-altitude large-span cantilevered base in the present application is applied in the field of building construction technology.

[0030] Nowadays, with the improvement of aesthetics, the public has higher and higher requirements for the appearance of buildings, and various shapes on the upper part of high-rise buildings have emerged. Figure 1 As shown in , the building body 300 is usually a high-altitude large-span building without supports and attachment points. During the construction of the high-altitude building, the maximum span relative to the roof cantilever structure 500 may be greater than 10m, and the height of the construction work from the ground may be greater than 100m, so it is impossible to use conventional cantilever steel scaffolding for construction. Affected by the span and cantilever structure, the existing cantilever steel scaffolding is heavy and difficult to disassemble and assemble, resulting in limited working height and working size; due to its weak bearing capacity, the construction safety factor is low; and because it cannot be used repeatedly, the construction cost increases. In view of this, the application provides a high-altitude large-span cantilever base, which has the significant advantages of light weight, high rigidity, stable support, strong bearing capacity, flexible turnover application, and saving of materials and labor costs.

[0031] refer to Figure 1 and Figure 2 The high-altitude large-span cantilever base provided in the embodiment of the present application is used for the construction of high-altitude modeling buildings and is applied to a certain project. In the project, the maximum plate top elevation of the residential building 300 is 104.9 meters, and the maximum cross-sectional size of the port beams in the artistic modeling of the roofs of the buildings 300 on both sides is a suspended large-span structural beam of 200×600mm and a maximum beam span of 10.4m. The maximum span of the building relative to the roof cantilever structure 500 is greater than 10m, the construction height from the ground is greater than 100m, and the cantilever length is greater than 2.5 meters. The building system cannot be constructed using conventional cantilever steel scaffolding. Affected by the span and cantilever structure, the existing cantilever steel scaffolding is heavy and difficult to disassemble and assemble, resulting in restrictions on the working height and working size; due to its weak bearing capacity, the construction safety factor is low; and because it cannot be used repeatedly, the construction cost increases. To this end, this application is implemented using a high-altitude, large-span cantilever base that has light weight, high rigidity, stable support, strong bearing capacity, flexible application, and savings in material and labor costs.

[0032] Combination Figure 3As shown in , the high-altitude large-span cantilever base includes a bottom cross frame assembled between the building bodies 300 on both sides and a steel base 200 detachably fixedly connected to the bottom cross frame; the bottom cross frame in this application is horizontally connected between the building bodies 300 on both sides, and the cantilevered steel base 200 is installed on the bottom cross frame to complete the high-altitude large-span cantilever base. The bottom cross frame in this application includes a plurality of steel trusses; the steel trusses are connected between the building bodies 300 on both sides in a vertical manner, and steel plates 301 at least 10 mm thick are embedded in the building bodies 300 on both sides; the bottoms of both ends of each steel truss are welded and connected to the steel plates 301 on both sides. The embedded steel plates 301 can effectively ensure that there is an effective contact surface during installation. In this application, the characteristics of light weight and high rigidity of the steel truss are used to connect the building bodies 300 with concrete structures at both ends as support. Each steel truss is a prefabricated frame. By measuring the distance between the building bodies 300 on both sides, the steel trusses are welded in a factory prefabricated manner, and the installation of the bottom cross frame is completed by hoisting, so that the assembly and disassembly is simple and convenient. In the present application, it is preferred that each steel truss is placed and welded on the steel plate 301 along the length direction of the building bodies 300 on both sides, but in other embodiments of the present application, it is also possible to embed screws on the building bodies 300 on both sides to achieve a disassembly method of bolt connection. It should be specifically explained that when welding is used to connect the steel plates 301, the connection welding points of the steel trusses need to be ground and cut during disassembly, which does not affect the supporting strength of the steel trusses.

[0033] Combination Figure 3 and Figure 4 As shown in , when the steel trusses are prefabricated in the factory, columns 102 are welded and connected to the inside of each steel truss at intervals, and a reinforcing brace 101 is welded and connected between two adjacent columns 102. This increases the overall support strength of the steel trusses.

[0034] A plurality of steel trusses are distributed along the length direction of the building bodies 300 on both sides as a counterweight frame 100 and a load-bearing frame 104, wherein the number of steel trusses of the load-bearing frame 104 is greater than the number of steel trusses of the counterweight frame 100; the steel base 200 includes a plurality of steel sections, each of which is longitudinally overlapped on a plurality of steel trusses and cantilevered to extend to the outside of the load-bearing frame 104; each steel section adopts an I-beam without welding in the middle.

[0035] The spacing between any two adjacent steel trusses on the counterweight frame 100 is greater than the spacing between any two adjacent steel trusses on the load-bearing frame 104. The bearing capacity of the load-bearing frame 104 is greater than the strength of the counterweight frame 100, thereby ensuring the strength of the cantilever. The number of the multiple steel trusses is five, seven or nine. Optional installation is performed according to different working conditions and environments, and flexible operation is performed. When the number of the multiple steel trusses is five, the number of steel trusses on the counterweight frame 100 is two, and the number of steel trusses on the load-bearing frame 104 is three. The density of the steel trusses of the load-bearing frame 104 is greater than the density of the steel trusses of the counterweight frame 100. It should be specifically explained that the steel trusses in this application can be selected in multiple quantities such as five, six, seven, eight, nine, etc. according to the different lengths of the buildings 300 on both sides and the different required cantilever distances, and optional installation is performed according to different construction scenarios.

[0036] In a specific embodiment, the bottom horizontal frame of the overall high-altitude large-span cantilever base is composed of five steel trusses, and 11 I-beams are connected to the five steel trusses. The steel trusses are 10.0m long, 9.4m clear span, 1.18m high, and the I-beam model is 45b. The steel trusses are welded into one piece using Q345 double angle steel, and the maximum lifting capacity of the vertical transportation machinery during the construction process is also considered.

[0037] Combination Figure 5 As shown in , both sides of the facade of each steel truss are connected to the corresponding building body 300 through inclined fixed channel steels 103. The strength of the steel truss installation is enhanced. The fixed channel steels 103 on both sides are connected to the steel truss in a relatively inclined manner, and the end of the fixed channel steel 103 away from the steel truss is connected to the building body 300 through an expansion bolt or a welded pre-buried steel plate 301, thereby ensuring the stability of the steel truss facade positioning construction. At the same time, a plurality of steel trusses are connected with a formwork frame 400 through an anti-slip device. In this application, a fastener-type steel pipe scaffolding is specifically used as the formwork frame 400, which is connected to a plurality of steel trusses as a whole to make its performance stable, and scaffolding boards are laid on the formwork frame 400 and a support frame is installed.

[0038] Each steel section is an I-beam placed vertically, and the I-beam is perpendicular to the multiple steel trusses. The support strength is reliable. Each I-beam is detachably fixedly connected to the steel truss of the counterweight frame 100 through a bolt assembly 201. By punching holes in the lower flange plates of the steel truss and the I-beam, the bolt assembly 201 is passed through for assembly, making disassembly and assembly more convenient.

[0039] In this embodiment, the supporting points at both ends are connected by steel trusses, the steel section is used as the cantilever structure base, and the fastener-type steel pipe scaffolding is used as the formwork frame 400, so as to form a formwork support system for a cantilever structure without a base. This solves the problem of high-altitude structure construction without supporting points where the ground-based scaffolding cannot be used and the length of the traditional cantilever structure is limited. It has the advantages of stable, safe and reliable structure and economic cost saving.

[0040] In this embodiment, after the upper I-beam is installed, the protective frame and the formwork frame 400 are supported on the cantilevered steel section through a special I-beam anti-slip device or fasteners. The vertical poles of the formwork frame 400 are erected along the direction of the I-beam, and the sweeping rods of the formwork frame 400 are 200mm away from the top of the cantilevered I-beam, horizontally at the bottom and vertically at the top. All steel pipes must be dislocated with each other, and the dislocation length must not be less than 500mm. Horizontal rods and scissor braces are erected, and the intersection of the horizontal rods and the vertical rods of the formwork frame 400 must be connected with fasteners, and the entire formwork frame 400 system must be connected to the formwork frame 400 in the structure to form a whole. After the vertical poles and cross bars are erected, horizontal scissor braces and vertical scissor braces should be set. The horizontal scissor brace is set at one place on the third horizontal rod, and the intersection of the scissor brace and the vertical pole must be connected with it with fasteners to ensure the stability of the frame.

[0041] In this embodiment, after the formwork frame is installed, the template and steel bars are installed. The plate formwork uses 14mm plywood, the main keel uses 48×3.0mm steel pipe, and the cross beam uses 50×70mm wooden beam. The beam bottom flat plate formwork is laid on the transverse secondary keel, and the secondary keel is placed on the main keel.

[0042] In this embodiment, after the bottom formwork of the beam is installed, the side formwork, foot plate and diagonal brace are installed. When laying the board formwork, it is laid from four sides and closed in the middle. When the board formwork is pressed on the side formwork of the beam, the corner formwork should be nailed. After the floor formwork is laid, it should be carefully checked whether the support is firm, and the beam and board surfaces of the formwork should be cleaned; the installation of beams and boards should be closely coordinated with the steel bar binding, and all board seams ≥ 2mm must be sealed with tape.

[0043] In this embodiment, after all the formwork is installed, concrete is poured. The pouring method is: combined with the site conditions of each cantilever formwork area, concrete distribution, concrete workability and construction process characteristics, the pouring is mainly carried out by tower crane lifting to avoid generating large impact loads. The pouring zones are: each cantilever formwork area is a separate zone. The pouring sequence is: the concrete pouring sequence follows the principle of "from the inside to the cantilever end, from the middle to the two ends, and symmetrical pouring". It is strictly forbidden to pour the cantilever end first to avoid the overturning of the formwork frame 400.

[0044] In this embodiment, after the concrete pouring is completed, the formwork is removed after the concrete strength reaches 100%. When removing the formwork, the principle of "from top to bottom, first build and then remove" should be followed, that is, first remove the tie rods and scissor braces, then remove the horizontal bars, vertical bars, vertical bars, etc., and finally remove the steel trusses composed of the counterweight frame-100, the reinforced diagonal braces-101, the columns-102, the fixed channel steel-103, and the load-bearing frame-110 and the steel base 200 composed of steel sections, and proceed in sequence according to the principle of "one step and one clear". The removed formwork is transported out and stacked together to facilitate the turnover of materials.

[0045] In this embodiment, after all the templates are removed, the steel and steel trusses are removed; in this application, all steel and steel trusses should be removed after the upper templates and steel pipes are removed. The removal method of steel trusses-steel is:

[0046] ①First, lay scaffolding boards directly on the steel trusses in the gaps between the steel sections to facilitate operation by construction workers.

[0047] ② Remove the upper I-beams one by one. Before removal, firmly connect the steel hanging point with the tower crane mechanical hook. The connecting bolts between the upper and lower parts should be removed one by one from the outside to the inside, and the hanging steel should be removed from the middle to both ends.

[0048] ③ The lower steel truss can be removed only after all the upper steel sections have been removed. The removal of the steel truss must be carried out strictly according to the following procedures: remove the fixed channel steels 103 one by one from the middle to both ends; firmly connect the outermost steel truss lifting point with the tower crane mechanical hook; and lift and remove the steel trusses one by one.

[0049] A person of ordinary skill in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. In line with the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present specification as above, which are not provided in detail for the sake of simplicity.

[0050] In addition, to simplify the description and discussion, and in order not to obscure one or more embodiments of the present specification, known power / ground connections of other components may or may not be shown in the provided figures. In addition, devices may be shown in the form of block diagrams to avoid obscuring one or more embodiments of the present specification, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which one or more embodiments of the present specification will be implemented (i.e., these details should be fully within the scope of understanding of those skilled in the art). Where specific details are set forth to describe exemplary embodiments of the present disclosure, it is apparent to those skilled in the art that one or more embodiments of the present specification may be implemented without these specific details or with variations in these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0051] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this disclosure.

Claims

1. A high-altitude large-span cantilever base, comprising a bottom horizontal frame assembled between two side buildings, and a steel base detachably fixedly connected to the bottom horizontal frame; characterized in that: The bottom horizontal frame includes a plurality of steel trusses; The plurality of steel trusses are distributed as a counterweight frame and a force-bearing frame along the length direction of the building bodies on both sides, and the number of steel trusses of the force-bearing frame is greater than the number of steel trusses of the counterweight frame; The steel base includes a plurality of steel sections, each of which is longitudinally overlapped on the plurality of steel trusses and cantilevered to extend to the outside of the load-bearing frame; The plurality of steel trusses are connected with formwork frames via anti-slip devices.

2. The high altitude large span cantilever base according to claim 1 is characterized in that: Steel plates are pre-buried on the buildings on both sides; The bottoms of both ends of each steel truss are correspondingly welded to the steel plates on both sides.

3. The high altitude large span cantilever base according to claim 1 is characterized in that: Each steel truss is a prefabricated frame.

4. The high altitude large span cantilever base according to claim 3 is characterized in that: Each steel truss is welded with columns at intervals, and reinforced diagonal braces are welded between two adjacent columns.

5. The high altitude large span cantilever base according to claim 1 is characterized in that: The distance between any two adjacent steel trusses on the counterweight frame is greater than the distance between any two adjacent steel trusses on the load-bearing frame.

6. The high altitude large span cantilever base according to claim 5, characterized in that: The number of the plurality of steel trusses is five, seven or nine.

7. The high altitude large span cantilever base according to claim 6, characterized in that: When the number of the plurality of steel trusses is five, The number of steel trusses on the counterweight frame is two, and the number of steel trusses on the load-bearing frame is three.

8. The high altitude large span cantilever base according to claim 1, characterized in that: Each of the steel sections is an I-beam placed vertically, and the I-beam and the plurality of steel trusses are perpendicular to each other.

9. The high altitude large span cantilever base according to claim 8, characterized in that: Each of the I-beams is detachably fixedly connected to the steel truss of the counterweight frame through a bolt assembly.

10. The high altitude large span cantilever base according to claim 1, characterized in that: Each steel truss is connected to the corresponding building on both sides of the facade through inclined fixed channel steels.

Images