CN115262986A - Installation method of long-span steel truss - Google Patents

Abstract

The invention relates to a method for installing a large-span steel truss, which comprises the following steps: assembling on the ground to form a lower chord beam, placing the lower chord beam on the top of a jack, and pre-arching the lower chord beam by using the jack; hoisting the lower chord beam to a set position of the main body structure, and connecting an inclined pull rod between the lower chord beam and the main body structure on two sides of the lower chord beam; and a horizontal first connecting beam is connected between the lower chord beam and the main body structure, and then the upper chord beam is installed on the top of the lower chord beam, so that the upper chord beam and the lower chord beam are spliced to form a steel truss, and the pull rod is disassembled. The invention effectively solves the problem that the large-span steel truss is easy to bend downwards when being installed, reduces the deformation of the steel truss bending downwards under the action of gravity by optimizing the installation method of the large-span steel truss, improves the installation precision of the steel truss, ensures the construction quality and improves the construction efficiency.

Description

Installation method of long-span steel truss

technical field

The invention relates to the field of building construction, in particular to a method for installing a large-span steel truss.

Background technique

In the process of hoisting steel trusses in steel structure engineering, due to the on-site assembly of various components, it is difficult to control the overall accuracy of the trusses after installation, resulting in a large deviation in the overall elevation of the floor where the trusses are located compared with the design value. The traditional hoisting method of steel trusses is Set up a full scaffolding support platform under the steel truss, and use a tower crane or a truck crane to lift each component to the design elevation and install it in bulk. However, due to the self-weight of the steel truss and the load transmitted by the upper component, the middle part of the truss will bend downward under tension to produce a certain deflection , so that the overall elevation of the floor where the truss is located has a large deviation from the design value, and this method is only applicable to the construction conditions of small truss span, small truss weight and low floor. The hoisting of steel trusses under other construction conditions is not applicable.

Contents of the invention

The purpose of the present invention is to overcome the defects of the prior art and provide a method for installing large-span steel trusses, which solves the problem of easy downward bending of large-span steel trusses during installation. By optimizing the installation method of large-span steel trusses, the Reduce the deformation of steel trusses bent downward by gravity, improve the installation accuracy of steel trusses, ensure construction quality, and improve construction efficiency.

The technical scheme for realizing the above-mentioned purpose is:

The invention provides a method for installing a large-span steel truss, comprising the following steps:

Assemble on the ground to form the lower string beam, place the lower string beam on the top of the jack, and use the jack to pre-arch the lower string beam;

Hoist the lower string beam to the set position of the main structure, and connect the inclined tie rods between the lower string beam and the main structure on both sides of the lower string beam;

The horizontal first connecting beam is connected between the lower run beam and the main structure, and then the upper run girder is installed on the top of the lower run girder, so that the upper run girder and the lower run girder are combined to form a steel truss, and the tie rods are removed.

The present invention adopts the installation method of the large-span steel truss. By using the jack to arch the lower string beam in advance on the ground, the arching height of the lower string beam can be offset with the downward bending amount due to gravity, and then the lower string beam is installed. In the main structure, tie rods are used to further fix the lower string girder to prevent the impact of the upper string girder installation process on the lower string girder, and the first connecting beam also provides strong support for the lower string girder, which solves the problem that the large-span steel truss tends to fall downward during installation. For the bending problem, optimize the installation method of the long-span steel truss to reduce the deformation of the steel truss bent downward by gravity, improve the installation accuracy of the steel truss, ensure the construction quality, and improve the construction efficiency.

The further improvement of the installation method of the large-span steel truss of the present invention is that when installing the upper string beam, it also includes:

A plurality of vertical rods are installed at intervals on the top of the lower string beam, a horizontal second connecting beam is connected between the vertical rods and the main structure, and an upper string beam is installed between two adjacent vertical rods.

The further improvement of the installation method of the large-span steel truss of the present invention is that a horizontal section is fixed near the top of the vertical bar;

Fix the upper string beam between two adjacent horizontal sections.

The further improvement of the installation method of the large-span steel truss of the present invention is that, after installing the upper string girder, it also includes:

Several diagonal braces are obliquely connected between the upper string beam and the lower string beam.

The further improvement of the installation method of the large-span steel truss of the present invention is that it also includes:

When assembling to form the lower run, a number of inclined first inclined sections are fixed on the top of the lower run at intervals; After the installation is completed, the braces are fixedly connected between the opposite first inclined section and the second inclined section.

The further improvement of the installation method of the large-span steel truss of the present invention is that, after installing the upper string girder, it also includes:

A plurality of support rods are vertically connected between the upper string beam and the lower string beam.

The further improvement of the installation method of the large-span steel truss of the present invention is that it also includes:

When assembling to form the lower string beam, a number of vertically arranged first support sections are fixed at intervals on the top of the lower string beam; After the beam is installed, the support rod is fixedly connected between the opposite first support section and the second support section.

The further improvement of the installation method of the large-span steel truss of the present invention is that it also includes:

When assembling to form the lower run beam, several vertical sections are fixed at intervals on the top of the lower run beam, and the vertical rods are fixedly connected to the vertical sections.

The further improvement of the installation method of the large-span steel truss of the present invention lies in that the arching height of the lower string girder is 15 mm.

The further improvement of the installation method of the large-span steel truss of the present invention is that it also includes:

When assembling the lower string beam, fix the connecting plate on the side of the lower string beam, fix the lower string beam to the main structure, fix one end of the tie rod to the main structure on the side of the lower string beam, and fix the other end of the tie rod to the connecting plate through bolts .

Description of drawings

Fig. 1 is a schematic diagram of the pre-arching of the lower string girder in the installation method of the large-span steel truss of the present invention.

Fig. 2 is a schematic diagram of the installation of the lower string girder in the installation method of the large-span steel truss according to the present invention.

Fig. 3 is a schematic diagram of the installation of the upper string girder in the installation method of the large-span steel truss according to the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1, the present invention provides a method for installing large-span steel trusses. By using jacks to arch the lower string beams on the ground in advance, the arching height of the lower string girders can be equal to the amount of downward bending due to gravity. offset, and then install the lower run beam on the main structure, and use tie rods to further fix the lower run girder to prevent the impact of the upper run girder installation process on the lower run girder, and the first connecting beam also provides strong support for the lower run girder, solving the problem of large-span steel The problem of downward bending is easy to occur when the truss is installed. By optimizing the installation method of the large-span steel truss, the deformation of the steel truss bent downward by gravity can be reduced, the installation accuracy of the steel truss can be improved, the construction quality can be guaranteed, and the construction efficiency can be improved. The installation method of the large-span steel truss of the present invention will be described below in conjunction with the accompanying drawings.

Referring to Fig. 1, Fig. 1 is a schematic diagram of the pre-arching of the lower string girder in the installation method of the large-span steel truss according to the present invention. The installation method of the large-span steel truss of the present invention will be described below with reference to FIG. 1 .

Shown in conjunction with Figures 1 to 3, the installation method of the large-span steel truss of the present invention comprises the following steps:

Assemble the lower string 11 on the ground, place the lower string 11 on the top of the jack, and use the jack to pre-arch the lower string 11;

hoisting the lower run beam 11 to the set position of the main structure, and connecting the inclined tie rods 16 between the lower run beam 11 and the main structure on both sides of the lower run beam 11;

Connect the first horizontal connecting beam between the lower run 11 and the main structure, and then install the upper run 12 on the top of the lower run 11, so that the upper run 12 and the lower run 11 are combined to form a steel truss, and the tie rods 16 are removed.

Specifically, the arching height of the lower string 11 is 15 mm.

Specifically, it also includes:

When assembling the lower run beam 11, fix the connecting plate 114 on the side of the lower run beam 11, fix the lower run beam 11 to the main structure, fix one end of the tie rod 16 to the main structure at the side of the lower run beam 11, and connect the other end of the tie rod 16 It is fixedly connected with the connecting plate 114 by bolts.

As a preferred embodiment of the present invention, when installing the upper run girder 12, it also includes:

A plurality of vertical rods 13 are installed at intervals on the top of the lower run beam 11, and a horizontal second connecting beam is connected between the vertical rods 13 and the main structure, and then the upper run beam 12 is installed between two adjacent vertical rods 13, Since the second connecting beam and the first connecting beam are located at the rear side of the steel truss, they are not shown in the figure.

Specifically, a horizontal section 131 is fixed near the top of the vertical bar 13;

The upper run beam 12 is fixedly connected between two adjacent horizontal sections 131 .

Further, after installing the top string 12, it also includes:

Several diagonal braces 14 are obliquely connected between the upper run beam 12 and the lower run beam 11 .

Specifically, it also includes:

When assembling to form the lower run beam 11, a number of first inclined sections 111 are fixed at intervals on the top of the lower run beam 11; The inclined section 121 is fixedly connected between the first inclined section 111 and the second inclined section 121 after the top run 12 is installed.

Further, after installing the top string 12, it also includes:

Several support rods 15 are vertically connected between the upper run 12 and the lower run 11 .

Specifically, it also includes:

When assembling the lower run beam 11, a number of vertically arranged first support sections 112 are fixed at intervals on the top of the lower run beam 11; For the second support section 122 , after the top string 12 is installed, the support rod 15 is fixedly connected between the opposite first support section 112 and the second support section 122 .

Further, it also includes:

When assembling the lower string 11 , several vertical sections 113 are fixed at intervals on the top of the lower string 11 , and the vertical rods 13 are fixedly connected to the vertical sections 113 .

The concrete construction method of the installation method of long-span steel truss of the present invention is as follows:

Assembled on the ground to form the lower run beam 11, and a number of vertically arranged first support sections 112 and vertical sections 113 are fixed at intervals on the top of the lower run beam 11, and the first support sections 112 and the vertical sections 113 are arranged alternately, and The first inclined section 11 is fixed on the top of the lower string 11 and on both sides of the vertical section 113, and the connecting plate 114 is installed on the side of the lower string 11;

Place the lower string 11 on the top of the jack, and use the jack to push the lower string 11 near the middle to pre-arch the lower string 11, so that the lower string 11 has a certain arching height;

Hoist the lower string 11 to the set height of the main structure, and then connect one end of the tie rod 16 to the connecting plate 114 of the lower string 11 through bolts, and fix the other end of the pull rod 16 to the main structure, so that the pull rod 16 tilts It is connected between the main structure and the lower run beam 11 to provide an oblique upward tension to the lower run beam 11;

connecting the first connecting beam horizontally between the lower run beam 11 and the main structure;

The vertical rod 13 is fixedly connected to the top of the vertical section 113, and the second connecting beam is horizontally connected between the vertical rod 13 and the main structure;

Assembled on the ground to form the upper run beam 12, and fixed a number of second inclined sections 121 at the bottom of the upper run beam 12 corresponding to the first inclined section 111, and fixed a number of second support sections 122 at the bottom of the upper run beam 12 corresponding to the first support section 112 ;

The upper run beam 12 is fixedly connected between the horizontal sections 131 of two adjacent vertical rods 13, the diagonal brace 14 is connected between the opposite first inclined section 111 and the second inclined section 121, and the opposite first support section 112 and the second support section 122 are connected with the support rod 15. At this time, the upper run 12 and the lower run 11 are combined to form a steel truss, and the tie rod 16 is removed.

The present invention has been described in detail above with reference to the embodiments of the accompanying drawings, and those skilled in the art can make various changes to the present invention according to the above description. Therefore, some details in the embodiments should not be construed as limiting the present invention, and the present invention will take the scope defined by the appended claims as the protection scope of the present invention.

Claims (10)

1. A method for installing a large-span steel truss, characterized in that it may further comprise the steps: Assembling on the ground to form the lower run beam, placing the lower run beam on the top of the jack, and using the jack to pre-arch the lower run beam; hoisting the lower run beam to the set position of the main structure, and connecting inclined tie rods between the lower run beam and the main structure on both sides of the lower run beam; A horizontal first connecting beam is connected between the lower run beam and the main structure, and an upper run beam is installed on the top of the lower run girder, so that the upper run beam and the lower run girder are combined to form a steel truss, and all Said tie rod. 2. The installation method of the long-span steel truss as claimed in claim 1, characterized in that, when installing the upper string beam, it also includes: A plurality of vertical rods are installed at intervals on the top of the lower chord beam, and a horizontal second connecting beam is connected between the vertical rods and the main structure, and then installed between two adjacent vertical rods The top string. 3. the installation method of long-span steel truss as claimed in claim 2, is characterized in that, the position of described vertical bar near top is fixed with horizontal section; The upper run beam is fixedly connected between two adjacent horizontal sections. 4. The installation method of the long-span steel truss as claimed in claim 1, characterized in that, after installing the upper chord beam, further comprising: A plurality of diagonal braces are obliquely connected between the upper run beam and the lower run beam. 5. The installation method of the long-span steel truss as claimed in claim 4, further comprising: When assembling the lower run beams, a number of first inclined sections are fixed at intervals on the top of the lower run beams; A plurality of second inclined sections are provided, and after the installation of the upper string girder is completed, the braces are fixedly connected between the opposite first inclined sections and the second inclined sections. 6. The installation method of the long-span steel truss as claimed in claim 1, characterized in that, after installing the upper chord beam, further comprising: A plurality of support rods are vertically connected between the upper run beam and the lower run beam. 7. The installation method of the long-span steel truss as claimed in claim 6, further comprising: When assembling to form the lower run, a number of vertically arranged first support sections are fixed at intervals on the top of the lower run; when assembling to form the upper run, the bottom of the upper run corresponds to the first support section A plurality of second support sections are fixed, and after the installation of the upper string beam is completed, the support rods are fixedly connected between the opposite first support sections and the second support sections. 8. The installation method of the long-span steel truss according to claim 1, further comprising: When assembling to form the lower run beam, several vertical sections are fixed at intervals on the top of the lower run beam, and the vertical rods are fixedly connected to the vertical sections. 9. The installation method of the long-span steel truss according to claim 1, wherein the arching height of the lower string girder is 15 mm. 10. The installation method of the long-span steel truss according to claim 1, further comprising: When assembling the lower run beam, fix the connecting plate on the side of the lower run beam, fix the lower run beam to the main structure, and then fix one end of the tie rod to the main structure at the side of the lower run beam, The other end of the pull rod is fixedly connected with the connecting plate through bolts.

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