Construction method of temporary support unloading of large-span pipe trusses

Abstract

The present invention relates to the technical field of tube truss unloading, and in particular to a construction method for unloading a large-span tube truss with temporary support, which includes construction preparation, setting up a work platform, setting up temporary support, hoisting the tube truss, coordinate verification and correction, temporary support support, inspection before unloading, gradual unloading and measurement of deflection changes, and unloading completion. The present invention replaces traditional lattice columns with temporary support frames on standard tower crane sections for unloading, which increases the temporary support operation area, reduces the construction difficulty, ensures the safety of unloading the large-span tube truss, improves labor efficiency, and effectively solves the construction cost.

Description

Technical Field

[0001] The invention relates to the technical field of tube truss unloading, in particular to a large-span tube truss temporary support unloading construction method. Background Art

[0002] The unloading of the span tube truss is one of the main difficult parts of the steel structure project installation. It has the characteristics of super-large span and super-heavy weight. Therefore, the unloading of the large span tube truss is one of the main technical difficulties in the installation process of the steel structure project. The existing tube truss unloading uses traditional lattice columns as temporary supports to unload step by step. However, due to the complex manufacturing process of the lattice columns, the complex calculation of the cross-sectional shape constant and the side deformation, and the small top working surface, it brings great inconvenience to the unloading construction.

[0003] In order to solve the above technical problems, we have improved and optimized the general unloading process and the large-span truss temporary support unloading construction method. Summary of the invention

[0004] The embodiment of the present invention provides a temporary support unloading construction method for a large-span pipe truss, so as to achieve the technical effects of increasing the top working surface, optimizing the unloading method, ensuring the protection measures for the pipe truss in the critical state during the unloading process of the pipe truss and reasonably optimizing the unloading process.

[0005] In one aspect of the present invention, a temporary support unloading construction method for a large-span pipe truss is provided, which is carried out according to the following steps:

[0006] S1. Preparation before construction: prepare the concrete roadbed, tower crane standard section, tower crane standard section supporting bolts, cable wind rope, working platform assembly, temporary support frame assembly, and truck crane in advance;

[0007] S2. Set up temporary supports: determine the location and number of temporary support frames according to the construction plan, and install the concrete roadbed; install the tower crane standard section on the concrete roadbed, and before installing the last tower crane standard section, install the working platform on the last tower crane standard section. When fixing, fix the two-way crossbar of the working platform to the tower crane standard section, fix the inner protection plate of the working platform to the inner side of the two-way crossbar, and fix the outer protection plate of the working platform to the outer side of the two-way crossbar;

[0008] A temporary support frame is installed on the inner protective plate of the working platform; the temporary support frame is composed of a bottom support frame and a rectangular frame, the rectangular frame is placed on the top of the bottom support frame, a jack is installed in the center of the bottom support frame, a jacking sleeve and a supporting sleeve are arranged on the outside of the jack in sequence from the inside to the outside, the telescopic rod of the jack is plugged into the top of the jacking sleeve, the top of the jacking sleeve is fixedly connected to the top of the supporting sleeve, and the upper end surface of the supporting sleeve is symmetrically provided with a support frame;

[0009] Then install the last tower crane standard section. After all tower crane standard sections are installed, install the tower crane standard section to the height calculated in advance and pull the cable wind rope. After the installation is completed, check whether the tower crane section installation meets the installation requirements;

[0010] S3. Truss hoisting: The truss hoisting is carried out in sections according to the tower crane section support points. After the truss is installed, it is calibrated and welded immediately. The jack drives the temporary support frame to rise as a whole, and then the pipe truss is placed on the support frame, so that the pipe truss is completely under the force of the jack, and the pipe truss is temporarily supported;

[0011] S4. Before unloading, coordinate measurement and verification shall be conducted on each temporary support point;

[0012] S5. According to the principle of unloading all temporary support frames at the same time, lower the temporary support frames by 20mm at a time. After staying for 4 hours without any problems, repeat the above steps, and continue to lower the temporary support frames that have not separated from the pipe truss by 20mm until all temporary support frames are completely separated from the pipe truss by 20mm and then stop;

[0013] S6. After all temporary support frames are unloaded, observe for 24 hours. If the deflection of individual trusses still increases during this period, causing the temporary support frames to be stressed, contact the company's relevant technical personnel or truss design unit personnel for a solution; 24 hours after all temporary supports are detached, if there is no abnormality with the trusses, the unloading is completed and the next step of construction and removal of temporary supports can be carried out.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention optimizes the selection of temporary supports, sets up temporary support frames on standard tower crane sections to replace traditional lattice columns for unloading, increases the temporary support working surface, ensures the protection measures for the tube trusses in the critical state of the tube trusses unloading process and reasonably optimizes the unloading process, thereby ensuring the unloading safety of large-span tube trusses, improving labor efficiency and effectively solving construction costs.

[0016] Further, the preferred embodiment adopted by the present invention is:

[0017] The temporary support frame can be unloaded by jacking or fine-tuning the bolts of the standard tower crane section.

[0018] Four bidirectional cross bars are cross-fixed with bolts to form a rectangular structure, and each cross bar is connected and fixed to the tower crane section with a U-shaped wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. In the drawings:

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 This is a structural diagram of the working platform on the last tower crane section;

[0022] Figure 3 This is a schematic diagram of the installation of the temporary support frame and the working platform;

[0023] Figure 4 is a structural schematic diagram of a temporary support frame;

[0024] Figure 5 It is a side view of the temporary support frame;

[0025] In the figure: concrete roadbed 1; tower crane standard section 2; cable 3; working platform 4; temporary support frame 5; cross bar 6; external protective plate 7; internal protective plate 8; bottom support frame 9; rectangular frame 10; support sleeve 11; support frame 12; connecting frame 13; diagonal brace 14; lifting sleeve 15; jack 16; limit ring 17. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0027] A large-span pipe truss temporary support unloading construction method includes construction preparation, setting up a working platform, setting up temporary support, hoisting the pipe truss, coordinate verification and correction, temporary support support, inspection before unloading, gradual unloading and measurement of deflection changes, and unloading completion. The specific contents are as follows:

[0028] S1. Preparation before construction: prepare in advance the concrete roadbed 1, tower crane standard section 2, tower crane standard section supporting bolts, cable wind rope 3, I-beam, jack 16, steel pipe, steel pipe supporting steel plate cover, and 2 25-ton truck cranes.

[0029] S2. Set up the working platform: determine the position and quantity of the temporary support frames 5 according to the construction plan, and install the concrete roadbed plate 1; install the tower crane standard section 2 on the concrete roadbed plate 1, and before installing the last tower crane standard section 2, install the working platform 4 on the last tower crane standard section. The working platform 4 consists of four bidirectional cross bars 6 (two horizontally and two vertically) and inner and outer protective plates. During installation, the four cross bars are cross-crossed and fixed into a rectangular structure with bolts, and each cross bar 6 is connected and fixed to the standard tower crane section with U-shaped wire, the inner protective plate 8 of the working platform 4 is fixed to the inner side of the cross bar 6, and the outer protective plate 7 of the working platform 4 is fixed to the outer end of the cross bar 6.

[0030] A temporary support frame 5 is installed on the internal protective plate 8 of the working platform 4: the temporary support frame 5 is composed of a bottom support frame 9 and a rectangular frame 10. The bottom support frame 9 and the rectangular frame 10 are respectively welded by I-beams. Specifically, the bottom support frame 9 is cross-welded by two I-beams and placed at the bottom of the rectangular frame 10. During installation, ensure that the center of the bottom support frame 9 is aligned with the center of the rectangular frame 10.

[0031] A jack 16 is installed at the center of the bottom support frame 9. The outside of the jack 16 is covered with a lifting sleeve 15 and a supporting sleeve 11 from the inside to the outside. The supporting sleeve 11 and the lifting sleeve 15 are respectively made of steel pipes of different diameters. The tops of the lifting sleeve 15 and the supporting sleeve 11 are flush and blocked by their own matching steel plate covers, and the tops of the lifting sleeve 15 and the supporting sleeve 11 are fixedly connected to form a whole. In this embodiment, in order to prevent the jack 16 from jacking up the lifting sleeve 15 and The lifting sleeve 15 slides relatively, and a limiting ring 17 is welded at the lower end of the steel plate cover on the top of the lifting sleeve 15. The center hole of the limiting ring 17 and the bottom surface of the steel plate cover of the lifting sleeve 15 form a limiting groove, and the end of the telescopic rod of the jack 16 is plugged into the limiting groove; the support frames 12 are symmetrically welded on the steel plate cover of the support sleeve 11, and the two support frames 12 are connected and fixed by a connecting frame 13, and the two sides of each support frame 12 are respectively welded and reinforced with the steel plate cover of the support sleeve 11 through diagonal braces 14.

[0032] After the working platform 4 and temporary support frame 5 on the last tower crane standard section are installed, continue to install the last tower crane standard section. After all the tower crane standard sections are installed, install the tower crane standard section to the height calculated in advance and then pull the cable guy rope 3. After the installation is completed, check whether the tower crane section installation meets the installation requirements.

[0033] S3, truss hoisting: the truss hoisting is carried out in sections according to the tower crane section support points. After the truss is installed, it is calibrated and welded immediately. The jack 16 drives the temporary support frame 5 to rise as a whole, and then the pipe truss is placed on the support frame 12, so that the pipe truss is completely under the force of the jack, and the pipe truss is temporarily supported;

[0034] S4. Before unloading, coordinate measurement and verification shall be conducted on each temporary support point;

[0035] S5. According to the principle of unloading all temporary support frames at the same time, the temporary support frames 5 are lowered by 20mm at a time. After staying for 4 hours without any problems, the above steps are repeated, and the temporary support frames 5 that have not separated from the pipe truss continue to be lowered by 20mm until all temporary support frames 5 are completely separated from the pipe truss by 20mm and then stop; the temporary support frames 5 can be unloaded by jacks 16 or by fine-tuning the bolts of standard tower crane sections, and during unloading, all temporary support frames must not be dismantled.

[0036] S6. After all temporary support frames 5 are unloaded, observe for 24 hours. If the deflection of individual trusses still increases during this period, causing the temporary support frames 5 to be stressed, contact the company's relevant technical personnel or truss design unit personnel for a solution; 24 hours after all temporary supports are detached, if there is no abnormality with the trusses, the unloading is completed and the next step of construction and removal of temporary supports can be carried out.

[0037] The present invention replaces the traditional lattice columns for unloading by setting up temporary support frames on standard tower crane sections, thereby increasing the temporary support operation area and reducing the construction difficulty, while ensuring the protection measures for the pipe truss in the critical state of the pipe truss unloading process and the reasonable optimization of the unloading process.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A long-span pipe truss temporary support unloading construction method is carried out according to the following steps: S1. Preparation before construction: prepare the concrete roadbed, tower crane standard section, tower crane standard section supporting bolts, wind rope, working platform assembly, temporary support frame assembly, and truck crane in advance; Features: S2. Set up temporary supports: determine the location and number of temporary support frames according to the construction plan, and install the concrete roadbed; install the tower crane standard section on the concrete roadbed, and before installing the last tower crane standard section, install the working platform on the last tower crane standard section. When fixing, fix the two-way crossbar of the working platform to the tower crane standard section, fix the inner protection plate of the working platform to the inner side of the two-way crossbar, and fix the outer protection plate of the working platform to the outer side of the two-way crossbar; A temporary support frame is installed on the inner protective plate of the working platform; the temporary support frame is composed of a bottom support frame and a rectangular frame, the rectangular frame is placed on the top of the bottom support frame, a jack is installed in the center of the bottom support frame, a jacking sleeve and a supporting sleeve are arranged on the outside of the jack in sequence from the inside to the outside, the telescopic rod of the jack is plugged into the top of the jacking sleeve, the top of the jacking sleeve is fixedly connected to the top of the supporting sleeve, and the upper end surface of the supporting sleeve is symmetrically provided with a support frame; Then install the last tower crane standard section. After all tower crane standard sections are installed, install the tower crane standard section to the height calculated in advance and pull the cable wind rope. After the installation is completed, check whether the tower crane section installation meets the installation requirements; S3. Truss hoisting: The truss hoisting is carried out in sections according to the tower crane section support points. After the truss is installed, it is calibrated and welded immediately. The jack drives the temporary support frame to rise as a whole, and then the pipe truss is placed on the support frame, so that the pipe truss is completely under the force of the jack, and the pipe truss is temporarily supported; S4. Before unloading, coordinate measurement and verification shall be conducted on each temporary support point; S5. According to the principle of unloading all temporary support frames at the same time, lower the temporary support frames by 20mm at a time. After staying for 4 hours without any problems, repeat the above steps, and continue to lower the temporary support frames that have not separated from the pipe truss by 20mm until all temporary support frames are completely separated from the pipe truss by 20mm and then stop; S6. After all temporary support frames are unloaded, observe for 24 hours. If the deflection of individual trusses still increases during this period, causing the temporary support frames to be stressed, contact the company's relevant technical personnel or truss design unit personnel for a solution; 24 hours after all temporary supports are detached, if there is no abnormality with the trusses, the unloading is completed and the next step of construction and removal of temporary supports can be carried out.

2. The long-span pipe truss temporary support unloading construction method according to claim 1 is characterized in that: The temporary support frame can be unloaded by jacking or fine-tuning the bolts of the standard tower crane section.

3. The long-span pipe truss temporary support unloading construction method according to claim 1 is characterized in that: Four bidirectional cross bars are cross-fixed with bolts to form a rectangular structure, and each cross bar is connected and fixed to the tower crane section with a U-shaped wire.

Images