Pre-construction method for large-span bidirectional orthogonal plate main truss

Abstract

This invention discloses a pre-construction method for a large-span, two-way orthogonal plate-type main truss, comprising the steps of: constructing the main truss structure; constructing the secondary trusses of the roof; and constructing the concrete floor slabs. This pre-construction method for the large-span, two-way orthogonal plate-type main truss allows for the early completion of the main truss construction, thereby advancing the project schedule.

Description

Technical Field

[0001] This invention relates to the field of steel structure construction technology, and in particular to a pre-construction method for a large-span, two-way orthogonal plate-type main truss. Background Technology

[0002] In related technologies, the truss in a truss structure refers to a truss beam, which is a type of latticed beam structure. Truss structures are commonly used in public buildings such as large-span factories, exhibition halls, stadiums, and bridges. Because they are mostly used in the roof structures of buildings, trusses are often also called roof trusses.

[0003] In current projects involving the construction of main trusses, such as high-speed railway stations, the construction sequence typically involves handing over the main truss construction after the floor slab concrete pouring is completed. Furthermore, the main truss is a large structure with a tight construction schedule. Therefore, if any preceding construction steps are not completed, such as a slow concrete pouring process, it will slow down the main truss construction, resulting in project delays. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a pre-construction method for large-span bidirectional orthogonal plate main trusses, which can complete the construction of the main trusses in advance, thereby completing the project ahead of schedule.

[0005] The pre-construction method for a large-span, bidirectional orthogonal plate-type main truss according to an embodiment of the present invention includes the following steps: Construction of the main truss; Construction of the secondary trusses of the roof; Construction is carried out on the concrete floor slab.

[0006] The pre-construction method for large-span bidirectional orthogonal truss panels according to embodiments of the present invention has at least the following beneficial effects: Since the pre-construction method for large-span bidirectional orthogonal truss panels places the main truss before the concrete floor slab construction, the main truss construction and the secondary truss construction of the roof can be completed before the concrete floor slab construction. Thus, the pre-construction method for large-span bidirectional orthogonal truss panels of the present invention can complete the main truss construction ahead of schedule, thereby advancing the project completion time.

[0007] According to some embodiments of the present invention, a pre-construction method for a large-span bidirectional orthogonal plate main truss involves simultaneously constructing a portion of the secondary truss after constructing a portion of the main truss.

[0008] According to some embodiments of the present invention, a pre-construction method for a large-span bidirectional orthogonal plate main truss involves simultaneously constructing a portion of the concrete floor slab after the secondary truss has been partially constructed.

[0009] According to some embodiments of the present invention, the pre-construction method for a large-span bidirectional orthogonal plate main truss further includes the step of: performing a simulation analysis on the overall stability, displacement, and component bearing capacity of the main truss installation before the main truss is constructed.

[0010] According to some embodiments of the present invention, the pre-construction method for a large-span bidirectional orthogonal plate main truss further includes the step of calculating the vertical displacement of the structure, the axial force of the components, and the stress of the components for the installation of the main truss before the main truss is constructed.

[0011] According to some embodiments of the present invention, a pre-construction method for a large-span bidirectional orthogonal plate main truss includes, during the construction of the main truss, the method further includes the step of stabilizing the steel columns of the main truss.

[0012] According to some embodiments of the present invention, the pre-construction method for a large-span bidirectional orthogonal plate main truss includes stabilizing the steel columns of the main truss by using diagonal bracing to support the steel columns.

[0013] According to some embodiments of the present invention, the pre-construction method for a large-span bidirectional orthogonal plate main truss further includes the step of hoisting the main truss during the construction of the main truss.

[0014] According to some embodiments of the present invention, the pre-construction method for a large-span bidirectional orthogonal plate main truss further includes the step of determining the hoisting method and the number of hoisting points based on the span of the component and the position of the construction machinery and equipment before hoisting the main truss.

[0015] According to some embodiments of the present invention, the pre-construction method for a large-span bidirectional orthogonal plate main truss further includes the step of connecting the main truss and the steel column during the construction of the main truss.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a flowchart illustrating the pre-construction method for a large-span, bidirectional orthogonal plate-type main truss according to some embodiments of the present invention. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] This paper exemplifies a building with a truss structure, such as a high-speed rail station. A high-speed rail station typically consists of a lower structure and an upper structure. The lower structure is a concrete slab structure, while the upper structure is a truss structure. In existing technology, the construction sequence for high-speed rail stations generally involves handing over the main truss construction after the concrete slabs are poured. However, due to the large size of the main truss (maximum span 63 meters), the construction schedule is tight. Any delays caused by problems in the initial floor slab pouring will extend the construction time of the main truss, making it impossible to complete the project on time. It should be noted that after the concrete slabs are poured, a certain amount of time is required for the concrete to harden before the main truss can be placed and assembled. During the waiting period for the concrete to harden, no assembly of the main truss can be performed, further delaying the construction period. Therefore, this application proposes a pre-construction method for a large-span, two-way orthogonal truss.

[0024] Please refer to Figure 1 In some embodiments, the pre-construction method for large-span bidirectional orthogonal truss main trusses includes the following steps: S100, Construct the main truss; S200, Construction of the secondary trusses of the roof; S300, Construction of concrete floor slabs.

[0025] Specifically, because the pre-construction method for the large-span, two-way orthogonal truss of this application places the main truss before the concrete floor slab construction, the main truss and the secondary trusses of the roof can be constructed before the concrete floor slab is built. Furthermore, since the main truss is constructed first in this application, compared to the prior art which requires waiting for the concrete to harden, this application saves time (because the main truss is installed while the concrete floor slab is being poured and waiting for it to harden). Thus, the pre-construction method for the large-span, two-way orthogonal truss of this application can complete the main truss construction ahead of schedule, thereby advancing the project completion date.

[0026] Furthermore, to expedite the construction period and thus save costs, the secondary trusses can be constructed simultaneously with the main trusses. Specifically, in some embodiments, the main truss construction area is divided into four regions: A, B, C, and D, with the construction sequence being A, B, C, and D. After the main truss construction in region A is completed, construction can begin in region B, while a portion of the secondary trusses can be constructed in region A. That is, after a portion of the main truss is constructed, a portion of the secondary trusses is constructed simultaneously. In this way, by simultaneously constructing the main and secondary trusses, the project completion time can be further shortened, thereby saving costs.

[0027] Furthermore, in some embodiments, after a portion of the secondary truss is constructed, a portion of the concrete floor slab is constructed simultaneously. For example, after the secondary truss construction in area A is completed, the concrete floor slab in area A can be constructed simultaneously during the construction of the secondary truss in area B, thereby shortening the project completion time.

[0028] Furthermore, the following is the construction sequence and dates for the construction methods in the prior art.

[0029]

[0030] According to the table above, the total construction time for the existing technology is 228 days.

[0031] The following is the construction sequence and dates for the pre-construction method of the large-span bidirectional orthogonal plate main truss in this application.

[0032]

[0033] As can be seen from the table above, the project completion time after using the pre-construction method for the large-span bidirectional orthogonal plate main truss of this application is 163 days. Compared with the 228 days in the prior art, the pre-construction method for the large-span bidirectional orthogonal plate main truss of this application can be completed 65 days earlier, thereby saving construction costs.

[0034] In some embodiments, before constructing the main truss, the method further includes the step of performing a simulation analysis of the overall stability, maximum displacement, and component bearing capacity of the main truss installation. Specifically, after performing the simulation analysis of the overall stability, maximum displacement, and component bearing capacity of the main truss installation, the minimum buckling coefficient of the main truss at each stage is made greater than the specification, thereby ensuring a high safety factor during the main truss construction process. Furthermore, the main truss can maintain a high safety factor even under earthquake and large wind load conditions. Further, SAP2000 analysis can be used to ensure the quality of the main truss after construction, taking into account parameters such as dead load, live load, wind load, temperature, and earthquake.

[0035] In some embodiments, before constructing the main truss, the method further includes the step of calculating the vertical displacement of the structure, the axial force of the components, and the stress of the components for the installation of the main truss. Specifically, after calculating the vertical displacement of the structure, the axial force of the components, and the stress of the components, the structural deformation values ​​at each stage can guide the steel structure construction. For example, it can guide the reinforcement of steel column supports before the construction of concrete floor slabs, thereby ensuring safety during the construction process. For instance, when hoisting a large-span plate-type main truss, a four-point hoisting method can be used to ensure safety during the construction of the main truss.

[0036] In some embodiments, the method further includes the step of stabilizing the steel columns of the main truss during construction. Specifically, stabilizing the steel columns of the main truss ensures safety during the construction process.

[0037] Furthermore, the specific methods of stabilization can include, in some embodiments, stabilizing the steel columns of the main truss by using diagonal bracing to support the steel columns. Specifically, there are two methods of stabilization. The first method involves firstly welding horizontal bars between multiple steel columns on the ground; then, pre-embedded parts are installed on the ±0.00m elevation concrete beam. After the ground steel columns are installed, the lower end of the diagonal brace is welded to the embedded part plate, and the upper end of the diagonal brace is welded 2.2 meters above the base of the ground steel column. The second method involves first setting up embedded parts on the -3.700m elevation ground beam, with short steel pipe columns pre-embedded on the embedded part plate. After the ground steel columns are installed, the lower end of the diagonal brace is welded to the pre-embedded short steel pipe column, and the upper end of the diagonal brace is welded 2.2 meters above the base of the ground steel column.

[0038] In addition, the temperature of the main truss can be maintained through various methods. For example, before placing the main truss on a single column, to prevent the vertical and horizontal forces generated by the truss's own weight from disturbing the column top, additional guy ropes are used in the weakest direction of the column to improve its temporary stability. When a single column is standing, three-sided guy ropes (evenly distributed at approximately 120°) are used. The upper point of the guy rope is located in the middle or the upper third of the column's height, and the lower point is preferably connected to an existing concrete column or anchored to a foundation such as a ground beam. In this way, the main truss can be stabilized, ensuring the safety of its installation.

[0039] Specifically, mechanical equipment can be used to improve efficiency during the construction of the main truss. In some embodiments, the method further includes the step of hoisting the main truss during construction. Hoisting the main truss with a crane can improve the work efficiency of the workers.

[0040] Furthermore, when hoisting the main truss, it is necessary to reduce its deformation during the hoisting process. To prevent deformation, in some embodiments, the method includes the following steps before hoisting the main truss: determining the hoisting method and the number of lifting points based on the span of the component and the location of the construction machinery. Specifically, firstly, the heaviest and largest span panel truss can be selected for verification. This allows for analysis and verification of whether the overall stability, load-bearing capacity, and deformation of the large-span panel truss meet the specifications. Secondly, the hoisting method and the number of lifting points are determined based on the span of the panel truss and the location of the on-site construction machinery. For example, if the main truss span is 59m and the truss segment weighs 65t, a dual-machine platform crane with a total of 4 lifting points can be used. For example, if the main truss span is 51m and the truss segment weighs 46t, a single-machine hoist with a total of 4 lifting points can be used. Finally, the structural deformation of the large-span panel truss is calculated from the horizontal state to the vertical hoisting state. Assuming that the large-span panel truss has the greatest deformation when it is hoisted to 45°, the position of the hoisting point can be calculated multiple times to avoid the main truss being hoisted at 45°. In this way, the deformation of the main truss can be reduced during hoisting.

[0041] In some embodiments, the method further includes the step of connecting the main truss and the steel column during the construction of the main truss. Specifically, the main truss and the steel column can be welded to ensure the stability of the connection between the steel column and the main truss. The specific steps for welding the main truss and the steel column may include: temporarily connecting the large-span plate-type main truss column to the corbel at the top of the steel column using temporary measures and completing the welding; hoisting the large-span plate-type main truss into position and connecting it using temporary measures, spot welding it in place, and completing the butt weld between the lower chord of the main truss and the corbel of the steel column; completing the butt weld between the upper chord of the large-span plate-type main truss and the column; and completing the welds at both ends of the patch web members.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A pre-construction method for large-span, two-way orthogonal plate-type main truss, characterized in that: Used in high-speed railway stations, the high-speed railway station includes a lower structure and an upper structure. The lower structure is a floor slab structure formed by concrete pouring, and the upper structure is a truss structure built by trusses. The pre-construction method of the large-span bidirectional orthogonal plate main truss includes the following steps: Construction of the main truss; Construction of the secondary trusses of the roof; Construction is carried out on the concrete floor slab.

2. The pre-construction method for large-span bidirectional orthogonal plate-type main truss according to claim 1, characterized in that, After constructing a portion of the main truss, a portion of the secondary truss is constructed simultaneously.

3. The pre-construction method for large-span bidirectional orthogonal plate-type main truss according to claim 2, characterized in that, After a portion of the secondary truss is constructed, a portion of the concrete floor slab is constructed simultaneously.

4. The pre-construction method for large-span bidirectional orthogonal plate-type main truss according to claim 1, characterized in that, Before constructing the main truss, the method further includes the step of: performing a simulation analysis on the overall stability, displacement, and component bearing capacity of the main truss installation.

5. The pre-construction method for large-span bidirectional orthogonal plate-type main truss according to claim 1, characterized in that, Before constructing the main truss, the method further includes the step of calculating the vertical displacement of the structure, the axial force of the components, and the stress of the components for the installation of the main truss.

6. The pre-construction method for large-span bidirectional orthogonal plate-type main truss according to claim 1, characterized in that, During the construction of the main truss, the method further includes the step of stabilizing the steel columns of the main truss.

7. The pre-construction method for large-span bidirectional orthogonal plate-type main truss according to claim 6, characterized in that, The stabilization of the steel columns of the main truss includes: using diagonal bracing to support the steel columns.

8. The pre-construction method for large-span bidirectional orthogonal plate-type main truss according to claim 1, characterized in that, When constructing the main truss, the method further includes the step of hoisting the main truss.

9. The pre-construction method for large-span bidirectional orthogonal plate-type main truss according to claim 8, characterized in that, Before hoisting the main truss, the method further includes the step of: determining the hoisting method and the number of hoisting points based on the span of the component and the position of the construction machinery and equipment.

10. The pre-construction method for large-span bidirectional orthogonal plate-type main truss according to claim 1, characterized in that, When constructing the main truss, the method further includes the step of connecting the main truss and the steel column.

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