V-shaped column steel structure truss lower chord node structure and construction method thereof

Abstract

The invention provides a V-shaped column steel structure truss lower chord node structure, which relates to the technical field of building construction and comprises a radial main chord member, a web member, an inverted V-shaped column member and an elevation control plate, the web members and the inverted V-shaped column members are arranged along the circumferential direction of the radial main chord members; the inverted-V-shaped column rod piece comprises two connecting round pipes, the connected ends of the two connecting round pipes are connected with the radial main chord member, the elevation control plate is arranged between the two connecting round pipes, the elevation control plate is located below the radial main chord member, and the elevation control plate is horizontally arranged. The invention further provides a construction method which comprises the V-shaped column steel structure truss lower chord node structure. The problems that the safety risk coefficient of high-altitude construction is increased, the construction quality is difficult to guarantee and the construction progress is seriously lagged due to the fact that supporting columns are installed on a temporary supporting frame to control and fix the elevation of a steel structure are solved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a V-shaped column steel truss lower chord node structure and its construction method. Background Technology

[0002] Traditional canopy steel structure truss construction involves hoisting the main truss in sections or as a whole, based on its weight and the parameters of the hoisting equipment. Support columns are then installed on temporary support frames to control and fix the steel structure's elevation. This method requires the steel truss to remain suspended at high altitudes for extended periods while the support columns are installed. Due to the heavy weight of the steel truss, the safety risks of high-altitude construction increase, and elevation control using support columns is difficult. Effective control of the canopy steel structure truss's elevation is challenging. Large stadiums typically have numerous main trusses for their canopy steel structures, and this method will severely delay the construction schedule. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a V-shaped column steel truss lower chord node structure and its construction method. This solves the problems of increased safety risks, difficulty in ensuring construction quality, and serious delays in construction progress caused by installing support columns on temporary support frames for steel structure elevation control and fixation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A V-shaped column steel truss lower chord node structure includes: radial main chord members, web members, inverted V-shaped column members, and elevation control plate;

[0006] The web members and inverted V-shaped column members are arranged circumferentially along the radial main chord member;

[0007] The inverted V-shaped column member includes two connecting round tubes. One end of the two connecting round tubes is connected to the radial main chord. The elevation control plate is set between the two connecting round tubes and is located below the radial main chord. The elevation control plate is set horizontally.

[0008] Preferably, the elevation control plate has notches at both ends that mate with the connecting round pipe.

[0009] Preferably, an H-shaped steel column is connected below the elevation control plate.

[0010] A construction method is also provided, including the V-shaped column steel truss lower chord node structure described in any one of the above-mentioned methods, comprising the following steps:

[0011] Step 1: Install temporary support frames, and set a transfer beam on top of the temporary support frames;

[0012] Step 2: On-site assembly of components; the radial main truss and circumferential truss of the roof are assembled horizontally using jigs.

[0013] Step 3: Install the outer ring V-shaped column joints;

[0014] Step 4: Install the inner ring V-shaped column joints;

[0015] Step 5: Install the lower chord node of the radial truss. The H-shaped steel column is welded to the top conversion beam of the temporary support frame in advance. When the lower chord node of the radial truss is hoisted to the support column, the H-shaped steel column is firmly welded to the elevation control plate, and the support position of the elevation control plate should be horizontal.

[0016] Step 6: V-shaped column installation. After the V-shaped column is hoisted into place and aligned, it is temporarily fixed with a support plate. After the butt welding of the V-shaped column is completed, the support plate is removed.

[0017] Step 7: Radial main truss installation. The radial main truss is assembled into a whole on the jig. After the welds pass inspection, it is lifted into place and fixed by a crawler crane.

[0018] Preferably, in step one, the main chord of the temporary support frame is made of angle steel L160mmX160mmX16mm, and the section size is 1.6mX1.6mX2.5m. The installation is carried out by hoisting individual sections with a crane or assembling sections into n sections on the ground and hoisting them together, where n≦4. When the height of the temporary support frame is 15 to 20 meters, guy ropes with a diameter of φ10 to φ14 are installed at the top of the section. When the height of the temporary support frame is >20 meters, guy ropes with a diameter of φ10 to φ14 are installed between 20 and 25 meters of the support frame.

[0019] Preferably, in step two, the assembly site is first leveled and compacted, gravel is laid, and roadbed boxes are set up with dimensions of 0.13 x 1.3 x 5.5 meters. A portal-shaped assembly frame is then set up on the roadbed boxes.

[0020] Preferably, in step five, the length of the H-shaped steel column is calculated based on the elevation of the top transfer beam of the temporary support frame and the design elevation of the lower chord node of the radial main truss, as measured on site.

[0021] Preferably, in step seven, after the position and elevation of the radial main truss are corrected, the mating joints of the radial main truss and the lower chord nodes of the radial truss are fixed with a plate.

[0022] The present invention has the following beneficial effects:

[0023] The installation elevation can be precisely controlled by the elevation control board, thus ensuring quality. The construction of the lower chord nodes of the truss is carried out first, followed by the construction of the V-shaped columns and the main truss, which improves the overall construction efficiency and speeds up the construction progress. Moreover, the main truss is constructed last, which eliminates the need to hoist the truss at high altitudes for a long time, reducing the safety risks of high-altitude operations.

[0024] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the lower chord node structure of the present invention;

[0026] Figure 2 This is a front view schematic diagram of the lower chord node structure of the present invention;

[0027] Figure 3 This is a cross-sectional schematic diagram of the elevation control plate of the present invention;

[0028] Figure 4 This is a schematic diagram of the construction steps of the present invention.

[0029] In the above attached figures: 1. Radial main chord; 2. Web member; 3. Elevation control plate; 31. Notch; 4. Connecting round pipe; 5. H-beam steel column. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of the present invention clearer and easier to understand, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] Please see Figures 1 to 3 As shown, a V-shaped column steel truss lower chord node structure includes: a radial main chord 1, a web member 2, an inverted V-shaped column member, and an elevation control plate 3; the web member 2 and the inverted V-shaped column member are arranged circumferentially along the radial main chord 1; the inverted V-shaped column member includes two connecting round tubes 4, one end of which is connected to the radial main chord 1; the elevation control plate 3 is arranged between the two connecting round tubes 4, and the elevation control plate 3 is located below the radial main chord 1, and the elevation control plate 3 is horizontally arranged.

[0032] An elevation control plate 3 is installed below the inverted V-shaped column member. The elevation control plate 3 is connected to the inverted V-shaped column member, and then the elevation is controlled by connecting the elevation control plate 3 to the H-shaped steel column 5. Since the elevation control plate 3 is plate-shaped, the connection between the H-shaped steel column 5 and the elevation control plate 3 is easier to construct than the direct connection between the H-shaped steel column 5 and the steel structure truss, which makes the elevation of the canopy structure truss effectively controlled.

[0033] Furthermore, such as Figures 1 to 3 As shown, the elevation control plate 3 has notches 31 at both ends that mate with the connecting pipe 4. The notches 31 increase the contact area between the elevation control plate 3 and the connecting pipe 4, resulting in a more stable connection. Furthermore, the notches 31 match the connecting pipe 4, acting as a limiting and guiding element, allowing for faster connection between the connecting pipe 4 and the elevation control plate 3.

[0034] like Figures 1 to 4 As shown, a construction method, including the aforementioned V-shaped column steel truss lower chord node structure, includes the following steps:

[0035] Step 1: Install temporary support frames, and set a transfer beam on top of the temporary support frames;

[0036] Step 2: On-site assembly of components; the radial main truss and circumferential truss of the roof are assembled horizontally using jigs.

[0037] Step 3: Install the outer ring V-shaped column joints;

[0038] Step 4: Install the inner ring V-shaped column joints;

[0039] Step 5: Install the lower chord node of the radial truss. The H-shaped steel column 5 is pre-welded to the top conversion beam of the temporary support frame. When the lower chord node of the radial truss is hoisted to the support column, the H-shaped steel column 5 is firmly welded to the elevation control plate 3, and the support position of the elevation control plate 3 should be horizontal.

[0040] Step 6: V-shaped column installation. After the V-shaped column is hoisted into place and aligned, it is temporarily fixed with a support plate. After the butt welding of the V-shaped column is completed, the support plate is removed.

[0041] Step 7: Radial main truss installation. The radial main truss is assembled into a whole on the jig. After the welds pass inspection, it is lifted into place and fixed by a crawler crane.

[0042] Specifically, in step one, the main chord of the temporary support frame uses angle steel L160mmX160mmX16mm, and the section dimensions are 1.6mX1.6mX2.5m. Installation is done by hoisting individual sections with a crane or assembling sections into n sections on the ground and hoisting them together, where n≦4. When assembling two sections, care should be taken to ensure that the upper and lower steel pipes are perpendicular to each other, and not parallel. After every four layers of sections are erected, the verticality of the supporting structure should be checked. When the height of the temporary support frame is 15 to 20 meters, guy ropes with a diameter of φ10 to φ14 are installed at the top of the section to stabilize the temporary support frame. When the support frame height is greater than 20 meters, guy ropes with a diameter of φ10 to φ14 are installed between 20 and 25 meters of the support frame. There are 3 guy ropes, which are fixed to the embedded parts of the adjacent temporary support frame. If there is a conflict between the guy ropes and the transfer beam of the temporary support frame, the fixing point is set on the transfer beam. The guy ropes can be removed after all the trusses on the temporary support frame are installed.

[0043] In step two, both the radial and circumferential main trusses of the roof are planar trusses. To control the settlement of the jig, the assembly site is first leveled and compacted, and then gravel is laid. If the site is hardened concrete, gravel is not required. Then, roadbed boxes are installed. These boxes are used for paving soft, uneven surfaces to facilitate construction. The roadbed boxes are 0.13 x 1.3 x 5.5 meters in size. A portal-type assembly jig is installed on the roadbed boxes. The height of the jig is determined based on the length of the radial and circumferential truss brackets. The jig is made of hot-rolled H-beams HW250*250*9*14.

[0044] In step three, the outer V-shaped column node is a spherical bearing node. After being assembled as a whole in the processing plant, it is transported to the site. Positioning punches are made at the steel column interface positions to facilitate on-site steel column installation and connection. Limiting blocks are installed on the spherical bearing lugs to prevent the spherical bearing from rotating. After the node is hoisted into place and aligned, short column supports are installed. The short column supports are removed after the hinge support node weld and the upper and lower welds of the V-shaped column are completed.

[0045] In step four, the entire assembly is processed by the factory and transported to the site. During processing, the centerline of the vertebral tube positioning and the positioning points of the interface are clearly marked. Based on the coordinates of the support location diagram, the positioning points are measured on the embedded plate, and the positioning crosshairs are drawn. Before installation, the appearance of the support is checked, and the correctness of the support's center position is ensured, with the temporary locking blocks stable and secure. During installation, the crosshairs of the support are aligned with the center of the embedded plate before welding and fixing. After the inner ring column-ball support node is hoisted into place and aligned, temporary supports are used to stabilize the node.

[0046] In step five, the length of the H-beam column is calculated based on the actual elevation of the top transfer beam of the temporary support frame and the design elevation of the lower chord node of the radial main truss, as measured on site. The H-beam column is then securely welded to the elevation control plate 3. Two additional H-beam columns can then be added to both ends of the lower chord node of the radial truss and welded securely to the temporary support frame to increase stability.

[0047] In step six, after the V-shaped column is hoisted into position and aligned, it is temporarily fixed with a support plate to ensure the weld is flat and facilitates construction. When there is misalignment or elevation adjustment at the butt joint, jacks and alignment supports are used for adjustment.

[0048] Step 7: After confirming the position and elevation of the radial main truss are correct, the connecting joints of the radial main truss and the lower chord nodes of the radial truss are fixed with clamps. Workers erect steel scaffolding on the upper part of the support structure, and lifelines are stretched around the support structure to ensure the personal safety of the workers.

[0049] This invention can precisely control the installation elevation through the elevation control plate 3, thereby ensuring quality; the construction of the lower chord node of the truss is carried out first, followed by the construction of the V-shaped column and the main truss, which improves the overall construction efficiency and speeds up the construction progress. Moreover, the main truss is constructed last, which eliminates the need to hoist the truss at high altitude for a long time, reducing the safety risks of high-altitude operations.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A V-shaped column steel truss lower chord node structure, characterized in that, include: Radial main chord (1), web members (2), inverted V-shaped column members and elevation control plate (3); The web member (2) and the inverted V-shaped column member are arranged circumferentially along the radial main chord member (1); The inverted V-shaped column member includes two connecting round tubes (4), one end of which is connected to the radial main chord (1). The elevation control plate (3) is set between the two connecting round tubes (4) and is located below the radial main chord (1). The elevation control plate (3) is set horizontally.

2. The V-shaped column steel truss lower chord node structure as described in claim 1, characterized in that, The elevation control plate (3) has notches (31) at both ends that mate with the connecting round pipe (4).

3. The V-shaped column steel truss lower chord node structure as described in claim 1, characterized in that, The elevation control plate (3) is connected to an H-shaped steel column (5) below it.

4. A construction method, comprising a V-shaped column steel truss lower chord node structure as described in any one of claims 1-3, characterized in that, Includes the following steps: Step 1: Install temporary support frames, and set a transfer beam on top of the temporary support frames; Step 2: On-site assembly of components; the radial main truss and circumferential truss of the roof are assembled horizontally using jigs. Step 3: Install the outer ring V-shaped column joints; Step 4: Install the inner ring V-shaped column joints; Step 5: Install the lower chord node of the radial truss. The H-shaped steel column (5) is welded to the top conversion beam of the temporary support frame in advance. When the lower chord node of the radial truss is hoisted to the support column, the H-shaped steel column (5) is firmly welded to the elevation control plate (3), and the support position of the elevation control plate (3) should be horizontal. Step 6: V-shaped column installation. After the V-shaped column is hoisted into place and aligned, it is temporarily fixed with a support plate. After the butt welding of the V-shaped column is completed, the support plate is removed. Step 7: Radial main truss installation. The radial main truss is assembled into a whole on the jig. After the welds pass inspection, it is lifted into place and fixed by a crawler crane.

5. The construction method as described in claim 4, characterized in that, In step one, the main chord of the temporary support frame is made of angle steel L160mmX160mmX16mm, and the section size is 1.6mX1.6mX2.5m. The installation is carried out by hoisting individual sections with a crane or assembling sections into n sections on the ground and hoisting them together, where n≦4. When the height of the temporary support is 15 to 20 meters, guy ropes with a diameter of φ10 to φ14 are installed at the top of the section. When the support height is >20 meters, guy ropes with a diameter of φ10 to φ14 are installed between 20 and 25 meters of the support.

6. The construction method as described in claim 4, characterized in that, In step two, the assembly site is first leveled and compacted, gravel is laid, and roadbed boxes are set up. The roadbed boxes are 0.13 x 1.3 x 5.5 meters in size, and portal-shaped assembly frames are set up on the roadbed boxes.

7. The construction method as described in claim 4, characterized in that, In step five, the length of the H-shaped steel column (5) is calculated based on the elevation of the top conversion beam of the temporary support frame and the design elevation of the lower chord node of the radial main truss, which are measured on site.

8. The construction method as described in claim 4, characterized in that, In step seven, after the position and elevation of the radial main truss are corrected, the joints of the radial main truss and the lower chord nodes of the radial truss are fixed with a plate.

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