Cantilevered steel truss platform and method of construction thereof

Abstract

The application discloses a cantilever steel truss platform and a construction method thereof, which comprises the following steps: embedding a beam in a lower layer beam outside a main body structure and connecting the beam to the steel skeleton of the lower layer beam, with the other end of the beam extending to the outside of the main body structure; arranging a truss body outside the main body structure, with the lower chord of the truss body being connected to the other end of the beam; embedding two rows of embedded columns in the lower floor slab of the main body structure and connecting the embedded columns to the steel skeleton of the lower layer beam; and supporting the structure, which comprises two rows of vertical columns and length-adjustable top support pieces, with each vertical column being vertically arranged on the embedded columns, each vertical column and the upper layer beam of the main body structure being respectively supported by a top support piece, the inner anchoring section of one end of the upper chord of the truss body being connected to the vertical columns on the embedded columns, and the lower end of a first inclined pull rod being connected to the lower chord and the upper end of the first inclined pull rod being connected to the vertical columns outside the supporting structure. The application solves the problem that all embedded parts of the existing cantilever steel truss platform are embedded in advance and the height of the platform cannot be flexibly adjusted in the later period.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a cantilevered steel truss platform and its construction method. Background Technology

[0002] In buildings with reinforced concrete main structures, when constructing auxiliary or decorative structures such as stone, cast bronze decorations, or steel cantilever structures on the exterior facade, it is necessary to erect a large cantilevered construction platform capable of bearing significant loads underneath. Generally, a ground-mounted operating platform or a cantilevered, lifting operating platform is used.

[0003] If a ground-mounted operating platform is used, when the erection height is too high, it often requires extremely large upright components, and the erection work is extensive, the erection and dismantling cycle is long, and the platform has many and complex attachments.

[0004] If a cantilevered lifting platform is used, it often requires a track to lift the platform from bottom to top. This is generally suitable for buildings with relatively small loads where construction is required on all floors. Considering buildings with large loads, where many components need to be stacked on the platform, and where only one or a few partial floors require such a platform for construction, a cantilevered steel truss platform anchored in the concrete structure is needed.

[0005] The survey revealed that some similar construction projects have adopted the method of anchoring cantilevered steel truss platforms into the main concrete structure to ensure the load-bearing capacity and stability of the cantilevered steel truss platforms. However, this method requires the complete detailed design of the steel truss to be completed before the main structure construction, and the relevant pre-embedding and reinforcement to be completed during the main structure construction process. In the later stages of the main structure's exterior cantilever structure and its decoration construction, the platform must be constructed according to the original detailed design, and the height of the platform cannot be adjusted. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, a cantilevered steel truss platform and its construction method are provided to solve the problem that all embedded parts of existing cantilevered steel truss platforms are pre-embedded, making it impossible to flexibly adjust the height of the platform later.

[0007] To achieve the above objectives, a cantilevered steel truss platform is provided, comprising:

[0008] An embedded beam, one end of which is embedded in the lower beam on the outside of the main structure and connected to the steel frame of the lower beam, and the other end of which extends to the outside of the main structure;

[0009] The truss body is located on the outside of the main structure, and the lower chord of the truss body is connected to the other end of the embedded beam.

[0010] Two rows of embedded columns, which are embedded in the lower floor slab of the main structure and connected to the steel frame of the lower beam;

[0011] The supporting structure includes two rows of columns and an adjustable-length top support. The two rows of columns are respectively erected on the two rows of embedded columns. Each column and the upper beam of the main structure are supported by a top support. One end of the upper chord of the truss body extends to form an inner anchor section, which is connected to the columns on the two rows of embedded columns.

[0012] The first diagonal tie rod has its lower end connected to the lower chord and its upper end connected to the column on the outside of the supporting structure.

[0013] Furthermore, it also includes a second diagonal tie rod, the upper end of which extends above the lower floor slab, and the lower end of which is connected to the upper end of the embedded column on the inner side of the support structure.

[0014] Furthermore, the supporting component is a jack.

[0015] Furthermore, the embedded beam is perpendicular to the exterior facade of the main structure.

[0016] This invention provides a construction method for a cantilevered steel truss platform, comprising the following steps:

[0017] During the construction of the main structure, one end of the pre-embedded beam is embedded in the lower beam on the outside of the main structure and connected to the steel frame of the lower beam. The other end of the pre-embedded beam extends to the outside of the main structure. At the same time, two rows of pre-embedded columns are embedded in the lower floor slab of the main structure and connected to the steel frame of the lower beam.

[0018] After the main structure is constructed, two rows of columns will be erected on the two rows of pre-embedded columns respectively;

[0019] A top support member is provided between each of the columns and the upper beam of the main structure to form a support structure;

[0020] A truss body is installed on the outside of the main structure, and the lower chord of the truss body is connected to the other end of the embedded beam. The inner anchor section of one end of the upper chord of the truss body is connected to the column on the two rows of embedded columns.

[0021] The lower end of the first diagonal tie rod is connected to the lower chord, and the upper end of the first diagonal tie rod is connected to the column on the outside of the support structure.

[0022] The beneficial effects of this invention are that, when only the number and location of the floors to be constructed can be determined, but the platform elevation is uncertain, the cantilevered steel truss platform of this invention only considers anchoring the lower-level members of the truss body into the main structure, while the upper-level members of the truss body can be erected independently. The height of the truss can be adjusted according to the specific plan of the cantilever structure and decorations in the later stage, so as to achieve the adjustability of the platform elevation. At the same time, the structural safety of the steel truss can be ensured by anchoring the lower-level members of the steel truss into the main structure and other measures. Attached Figure Description

[0023] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 This is a structural schematic diagram of the cantilevered steel truss platform according to an embodiment of the present invention.

[0025] Figure 2 for Figure 1 The sectional view at point AA.

[0026] Figure 3 for Figure 1 The sectional view at point BB.

[0027] Figure 4 This is a side view of the cantilevered steel truss platform according to an embodiment of the present invention. Detailed Implementation

[0028] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Reference Figures 1 to 4 As shown, the present invention provides a cantilevered steel truss platform, including: a pre-embedded beam 1, a truss body 2, a pre-embedded column 3, a supporting structure 4, and a first diagonal tie rod 5.

[0031] In this embodiment, the embedded beams and columns are installed during the construction of the main structure. The floors where the embedded beams and columns are installed are the floors corresponding to the cantilevered steel truss platform. The main structure 7 adopts a frame structure, specifically including frame beams 72, frame columns 71, and floor slabs 73. The frame beams are steel-framed beams, and the frame columns are steel-framed columns. The frame beams and frame columns are reinforced with steel frames.

[0032] Specifically, the embedded beam 1 is installed horizontally. The embedded column is installed vertically. As a preferred embodiment, the embedded beam 1 is perpendicular to the exterior facade of the main structure 7.

[0033] One end of the embedded beam 1 is embedded in the lower beam on the outside of the main structure 7. The embedded beam is connected to the steel frame of the lower beam. The other end of the embedded beam 1 extends to the outside of the main structure 7.

[0034] The truss body 2 is located on the outside of the main structure 7. The lower chord 21 of the truss body 2 is connected to the other end of the embedded beam 1.

[0035] like Figure 3 As shown, two rows of embedded columns 3 are embedded in the lower floor slab 73 of the main structure 7. The embedded columns 3 are connected to the steel frame of the lower beam. The positions of the embedded columns correspond to the positions of the frame beams on the lower floor slab. Specifically, a row of embedded columns is set on each of the two outermost rows of frame beams of the main structure.

[0036] The supporting structure 4 includes two rows of columns 41 and a top support 42. The length of the top support 42 is adjustable. The two rows of columns 41 are erected on two rows of embedded columns 3. Each column 41 is supported by a top support 42 between itself and the upper beam of the main structure 7. One end of the upper chord 22 of the truss body 2 extends to form an inner anchor section 222. The inner anchor section 222 is connected to the columns 41 on the two rows of embedded columns 3.

[0037] As a preferred implementation method, the top support 42 is a jack.

[0038] The first diagonal tie rod 5 is inclined. The lower end of the first diagonal tie rod 5 is connected to the lower chord 21. The upper end of the first diagonal tie rod 5 is connected to the column 41 on the outside of the supporting structure 4.

[0039] The cantilevered steel truss platform of the present invention also includes a second diagonal tie rod 6. The second diagonal tie rod 6 is inclined. The upper end of the embedded column 3 extends above the lower floor slab 73. The lower end of the second diagonal tie rod 6 is connected to the upper end of the embedded column 3 on the inner side of the supporting structure 4.

[0040] This invention provides a construction method for a cantilevered steel truss platform, comprising the following steps:

[0041] S1. Construction of the main structure 7: When constructing the main structure 7, one end of the pre-embedded beam 1 is pre-embedded in the lower beam outside the main structure 7 and connected to the steel frame of the lower beam. The other end of the pre-embedded beam 1 extends to the outside of the main structure 7. At the same time, two rows of pre-embedded columns 3 are pre-embedded in the lower floor slab 73 of the main structure 7 and the two rows of pre-embedded columns 3 are connected to the steel frame of the lower beam.

[0042] S2. After the main structure 7 is constructed, the two rows of columns 41 are erected on the two rows of pre-embedded columns 3 respectively.

[0043] S3. A top support 42 is supported between each column 41 and the upper beam of the main structure 7 to form a support structure 4.

[0044] S4. Install the truss body 2 on the outside of the main structure 7, connect the lower chord 21 of the truss body 2 to the other end of the embedded beam 1, and connect the inner anchor section 222 of one end of the upper chord 22 of the truss body 2 to the column 41 on the two rows of embedded columns 3.

[0045] S5. Connect the lower end of the first diagonal tie rod 5 to the lower chord 21, and connect the upper end of the first diagonal tie rod 5 to the column 41 on the outside of the support structure 4.

[0046] Before the main structure construction, the floor level for the cantilevered steel truss platform should be determined. Based on the approximate construction scope and load weight required for the cantilevered steel truss platform, and the detailed design scheme for the steel structure anchored in the concrete structure of the main structure, the dimensions of the lower chord of the truss should be preliminarily determined. The anchorage length L2 of the steel structure (embedded beams and columns) anchored in the concrete structure should not be less than the cantilever length L1 of the cantilevered steel truss. The anchorage length L2 of the steel structure should be calculated according to the specific situation and set at least one span or several consecutive spans as needed.

[0047] During the construction of the main structure, the construction proceeds along the main structure, completing the construction of the embedded beams and columns anchored in the concrete structure.

[0048] The columns should be installed in the vertical components of the main structure (such as embedded columns). The height of the columns should be greater than the height H of the cantilevered steel truss platform, and several layers of connection should be set according to the structural requirements during the detailed design.

[0049] The embedded beams extend beyond the main structure to connect with the lower chord of the truss. Simultaneously, embedded columns should be pre-installed at appropriate locations on the steel frame beams, extending upwards beyond the floor slab to connect with the vertical columns. These pre-installed beams and columns should be directly welded and installed onto the steel frame beams and columns in the factory during the steel frame fabrication process to ensure structural reliability, avoiding on-site installation.

[0050] After the main structure construction is completed, and before the construction of the cantilever structure and decorations, the height, component dimensions, and length of the cantilever steel truss platform shall be further determined based on the final design scheme of the cantilever structure and decorations and the site conditions. The dimensions of the columns shall be determined according to the stress requirements of the final steel truss. The connection node positions between the columns and the upper chord of the steel truss shall be set according to the final height H of the steel truss. The columns shall be fabricated in the factory in one go to ensure the reliability of the components.

[0051] After the main structure is completed and before the cantilever structure and decorations are installed, the columns are installed first. The top of the columns is fitted with a top support to ensure that the columns are tightly fitted to the upper beams and slabs and have a certain preload.

[0052] The truss body comprises components such as lower chords, upper chords, outer connecting beams 24, inner connecting beams, upper non-cantilever chords, and web members 23. The upper chord should be positioned away from the frame columns within the platform area to allow for connection with the columns. The top elevation of the steel truss (i.e., the construction elevation of the workers) can be adjusted by changing the height of the upper chords as needed. Lower chords can be installed on any vertical members within the platform area to ensure the truss body can be directly anchored into the main structural vertical members, guaranteeing reliable anchoring. Simultaneously, corresponding lower chords anchored in the frame beams should be installed at the planar positions of all upper chords; corresponding lower non-cantilever chords should be installed at the planar positions of lower chords on vertical members, ensuring that all upper and lower chords can be connected into a vertical, single-piece structure via web members, guaranteeing the rationality of the truss structure's stress distribution.

[0053] After the columns are installed, the truss body components are installed. During steel truss installation, the individual truss sections should be assembled on-site or in the factory first, along with the chord members, before the individual truss sections are installed. After installation, the upper-level non-cantilever chord individual truss sections must be temporarily secured using ropes or similar measures. These temporary fixation measures can only be removed after the installation of the outer connecting beams, inner connecting beams, and all web members (diagonal and straight web members) is completed, ensuring that all upper-level non-cantilever chord individual truss sections are effectively connected to the upper chord individual truss sections as a whole.

[0054] After the truss body construction is completed, the deformation of the columns should be checked again to see if it meets the requirements, and the top support should be tightened to ensure the structural safety of the steel truss.

[0055] The cantilevered steel truss platform of this invention, when only the number and location of the floors to be constructed are known, but the platform elevation is uncertain, only considers anchoring the lower-level members of the truss body into the main structure. However, the upper-level members of the truss body can be erected independently. The height of the truss can be adjusted according to the specific plan of the cantilever structure and decorations, achieving adjustable platform elevation. At the same time, the structural safety of the steel truss is ensured through anchoring the lower-level members into the main structure and other measures. The above description is only a preferred embodiment of this application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A cantilevered steel truss platform, characterized by, include: An embedded beam, one end of which is embedded in the lower beam on the outside of the main structure and connected to the steel frame of the lower beam, and the other end of which extends to the outside of the main structure; The truss body is located on the outside of the main structure, and the lower chord of the truss body is connected to the other end of the embedded beam. Two rows of embedded columns, which are embedded in the lower floor slab of the main structure and connected to the steel frame of the lower beam; The supporting structure includes two rows of columns and an adjustable-length top support. The two rows of columns are respectively erected on the two rows of embedded columns. Each column and the upper beam of the main structure are supported by a top support. One end of the upper chord of the truss body extends to form an inner anchor section, which is connected to the columns on the two rows of embedded columns. The first diagonal tie rod has its lower end connected to the lower chord and its upper end connected to the column on the outside of the supporting structure.

2. The cantilevered steel truss platform according to claim 1, characterized in that, It also includes a second diagonal tie rod, the upper end of the embedded column extends above the lower floor slab, and the lower end of the second diagonal tie rod is connected to the upper end of the embedded column on the inner side of the support structure.

3. The cantilevered steel truss platform according to claim 1, characterized in that, The supporting component is a jack.

4. The cantilevered steel truss platform according to claim 1, characterized in that, The embedded beam is perpendicular to the outer facade of the main structure.

5. A construction method for a cantilevered steel truss platform as described in any one of claims 1 to 4, characterized in that, Includes the following steps: During the construction of the main structure, one end of the pre-embedded beam is embedded in the lower beam on the outside of the main structure and connected to the steel frame of the lower beam. The other end of the pre-embedded beam extends to the outside of the main structure. At the same time, two rows of pre-embedded columns are embedded in the lower floor slab of the main structure and connected to the steel frame of the lower beam. After the main structure is constructed, two rows of columns will be erected on the two rows of pre-embedded columns respectively; A top support member is provided between each of the columns and the upper beam of the main structure to form a support structure; A truss body is installed on the outside of the main structure, and the lower chord of the truss body is connected to the other end of the embedded beam. The inner anchor section of one end of the upper chord of the truss body is connected to the column on the two rows of embedded columns. The lower end of the first diagonal tie rod is connected to the lower chord, and the upper end of the first diagonal tie rod is connected to the column on the outside of the support structure.

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