CN117328686A - Method for installing main truss and steel structure of column-free building - Google Patents

Abstract

The invention relates to a method for installing a main truss of a column-free building, and belongs to the technical field of building member assembly. The installation method comprises the following steps: step A, dividing the main truss into a middle section and two identical side sections, and arranging an assembling area and two hoisting areas on a site of a non-column building; step B, arranging a jig frame in the assembly area, assembling the middle section on the jig frame, arranging a lifting tower in the assembly area, and lifting the middle section by using the lifting tower; hoisting the pre-assembled side sections in the hoisting area, fixing the side sections on the concrete supporting structure, and connecting the middle section and the side sections together so as to form the integrated main truss; and hoisting one side section, and hoisting the other side section. The invention also relates to a method for installing the steel structure of the column-free building.

Description

Method for installing main truss and steel structure of column-free building

Technical Field

The invention relates to the technical field of building component assembly, in particular to a method for installing a main truss and a steel structure of a column-free building.

Background

The steel structure building in China starts from the 80 s of the 20 th century, and after the 90 s of the 20 th century, the steel structure building is in a rapidly developing state under the support of the country. In recent years, steel construction has begun to be widely used in large-scale construction systems such as exhibition centers, stadiums, movie theaters, stations, and the like. Fig. 1 shows that the column-free building mainly comprises: concrete supporting structure, main truss, secondary truss, side truss, roof girder steel, etc. The pillarless building has no pillar structure in the middle of the building site. The main truss is an inverted triangle pipe truss, and may be provided with the following dimensions, for example: the length is 100.8m, the sagittal height is 7.65m, and the maximum weight of a single truss is 245t. For the installation of large-span non-column buildings, particularly main trusses of the non-column buildings, the methods of sectional hoisting, high-altitude splicing, integral hoisting and the like are generally adopted at present in China. The construction method of sectionally hoisting can reduce the use amount of the tool, but the high-altitude work load is greatly improved, the cost of the large construction machinery is high, and the construction safety risk is also high; the high-altitude splicing is adopted, so that the requirements on the field are high, and the danger coefficient of the high-altitude operation is large; the integral lifting is adopted, so that the cooperative operation requirement on lifting equipment is high; and by adopting integral hoisting, large hoisting equipment is required, and the cost is too high.

For a non-column building comprising a large-span inverted triangle pipe truss, the construction site requirement is high, the hoisting condition is limited, the high-altitude work load is large, and the construction danger coefficient is high. Under the condition that the truss span is large, temporary support is needed if the truss is lifted by adopting a subsection, and the structure stability is poor due to the fact that the temporary support is high, and a large number of tools are consumed when the jig frame is manufactured for a stable structure. In addition, the nodes of the inverted triangle pipe truss structure are tubular product intersecting nodes, and the requirement on the precision of the butt joint interface of the circular pipes is high during high-altitude welding operation.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

Disclosure of Invention

The invention aims to provide a method for installing a main truss of a non-column building and a method for installing a steel structure, which have higher working efficiency and safer construction by adopting sectional hoisting and lifting.

To achieve the above object, according to an embodiment of the present invention, there is provided a method of installing a main truss of a non-pillar building including a concrete supporting structure and a main truss, the method comprising the steps of: step A, dividing a main truss into a middle section and two identical side sections, and arranging an assembling area and two hoisting areas on a site of a non-column building, wherein the main truss sequentially comprises the side sections, the middle section and the side sections, the assembling area corresponds to the middle section, the two hoisting areas respectively correspond to the two side sections, and the hoisting areas comprise a concrete supporting structure; step B, arranging a jig frame in the assembling area, assembling a middle section on the jig frame, arranging a lifting tower in the assembling area, and lifting the middle section by using the lifting tower; hoisting the pre-assembled side sections in the hoisting area, fixing the side sections on a concrete supporting structure, and connecting the middle section and the side sections together so as to form an integrated main truss; wherein, one side section is hoisted firstly, and then the other side section is hoisted.

Preferably, in the step a, the middle section is divided into a first section, and identical second and third sections, wherein the middle section sequentially comprises the second section, the first section and the third section; dividing the assembly area into a first assembly area, a second assembly area and a third assembly area, wherein the first assembly area corresponds to the first section, and the second assembly area and the third assembly area correspond to the second section and the third section respectively.

Preferably, in step B, the first section is assembled on the jig frame of the first assembly area, the lifting tower is arranged in the assembly area, the second section and the third section are assembled in the second assembly area and the third assembly area respectively, and the second section and the third section are welded to the first section so as to form an integrated middle section, and then the middle section is lifted by the lifting tower.

Preferably, the lifting tower and the jig frame are arranged on the same roadbed box of the column-free building.

Preferably, in step B, before lifting the middle section of the main truss, the position of the lifting point of the middle section of the main truss is determined; and synchronously controlling each lifting point in the lifting process.

In one embodiment of the present invention, there is provided a method for installing a steel structure of a non-column building including a concrete supporting structure and a steel structure including a main truss, a side truss, a sub-truss and a roof girder, the method for installing a steel structure of a non-column building employing the method for installing a main truss of a non-column building as described above, the method for installing a steel structure of a non-column building including the steps of: step 1, arranging a plurality of parallel construction areas on a field of a non-column building in a direction perpendicular to the extending direction of a main truss, wherein each construction area comprises two hoisting areas and an assembling area; step 2, repeatedly executing the step A, the step B and the step C in a central construction area in a plurality of construction areas so as to install a plurality of main trusses in the central construction area; step 3, hoisting the pre-assembled side trusses among the multiple main trusses in a hoisting area after the multiple main trusses are installed in place; and step 4, repeatedly performing the steps 1 to 3 in the adjacent construction area on one side of the central construction area, and then repeatedly performing the steps 1 to 3 in the adjacent construction area on the other side of the central construction area, so as to install a plurality of main trusses in each construction area.

Preferably, in step B, lifting the middle section comprises lifting a pre-assembled secondary truss connected below the middle section, the secondary truss extending in a direction perpendicular to the primary truss.

Preferably, in step B, lifting the middle section further includes lifting a roof girder connected to an upper portion of the middle section, and an extension direction of the roof girder is perpendicular to the main truss.

Preferably, in step D, after the side truss hoisting in step 3 is completed, the structure is unloaded.

Preferably, step E, after the unloading of the structure is completed, the lifting tower is dismantled.

According to the embodiment of the application, the ground is assembled first and then lifted, so that the butt joint precision and truss connection stability are improved. Each lifting point is synchronously controlled during lifting, so that the position of a lifted structure is guaranteed to be synchronous, real-time stress and strain monitoring is carried out on the lifting tower and the main truss key, the safety of the lifting process is greatly improved, the displacement deformation of the truss is accurately controlled, the construction period is shortened, the mechanical cost is saved, and the problem of narrow places is solved. The jig frame and the lifting tower are arranged on the same roadbed box so as to save tooling materials.

Drawings

FIG. 1 is a perspective view of a steel structure of a column-free building according to an embodiment of the present invention;

FIG. 2 is a top view of the steel structure of the column-less building shown in FIG. 1;

FIG. 3 is a front view of a main truss of a non-columnar structure showing a concrete support structure of the non-columnar structure, according to an embodiment of the invention;

FIG. 4 is a schematic illustration of a section of a main truss of a column-less building according to an embodiment of the invention;

FIGS. 5 and 6 are schematic site divisions of a pillarless building according to an embodiment of the present invention;

FIG. 7 is a schematic illustration of a side section of a main truss according to an embodiment of the invention;

FIG. 8 is a schematic illustration of side section lifting of a main truss according to an embodiment of the invention;

FIG. 9 is a schematic illustration of a middle section of a main truss according to an embodiment of the invention; a jig frame and a roadbed box are also shown;

FIG. 10 is a schematic view of a jig frame and a lifting tower according to an embodiment of the invention, wherein the jig frame and the lifting tower are shown disposed on the same foundation box.

The main reference numerals illustrate:

1-a steel structure; 2-a main truss; 3-side truss; 4-time truss; 5-roof steel beams; 6-construction area; 7-splicing areas; 71-a first splicing region; 72-a second splicing area; 73-a third splicing area; 8-a hoisting area; 9-middle section; 91-first section; 92-a second section; 93-third section; 10-edge segments; 11-a concrete support structure; 12-a jig frame; 13-lifting the tower; 14-roadbed boxes; 15-steel plate.

Detailed Description

The following detailed description of specific embodiments of the invention is, but it should be understood that the invention is not limited to specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of being practiced otherwise than as specifically illustrated and described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present disclosure will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, thicknesses of layers and regions are exaggerated for clarity, and identical reference numerals are used to denote identical devices, and thus descriptions thereof will be omitted.

As shown in fig. 1, the column-free building includes a concrete support structure 11 and a steel structure 1. The steel structure 1 comprises a main truss 2, side trusses 3, secondary trusses 4, and roof steel beams 5. The ends of the main truss 2 are fixed to concrete support structures 11 on both sides of the site of the column-free building. The side trusses 3 are connected between the main trusses 2 and above the concrete support structure 11. The sub-trusses 4 are connected below the main trusses, and the extension direction of the sub-trusses 4 is perpendicular to the main trusses 2. The roof girder 5 is connected to the upper portion of the main girder 2 and the extending direction of the roof girder 5 is perpendicular to the main girder 2. By way of example, fig. 1 shows that the span of the steel structure 1 of the pillarless building of the present embodiment is 100.8m, the height of the steel structure 1 is 24.15m, and eleven main trusses 2 are disposed in the north-south direction. The main truss 2 takes the form of an inverted triangle pipe truss structure, and the height of the center line of the main truss 2 is 3.941-6.9 m, and the pitch of the main truss 2 is 18m (axis pitch) by way of example.

The method of installing the main girder 2 of the present embodiment will be described in detail with reference to the accompanying drawings. The installation method of the main truss 2 comprises the following steps:

step A, as shown in fig. 3, 4, 5, 6 and 7, divides the main truss 2 into a middle section 9 and two identical side sections 10, and sets an assembling area 7 and two hoisting areas 8 on the site of the non-column building. As shown in fig. 4, the main truss 2 includes side sections 10, a middle section 9, and side sections 10 in this order. As shown in fig. 5, the splicing section 7 corresponds to a middle section 9, and the two hoisting sections 8 correspond to two side sections 10, respectively. That is, the hoist area 8, the splice area 7, and the hoist area 8 are arranged in this order in the direction in which the main truss 2 extends, and the dimensions in the direction in which the main truss 2 extends are substantially the same as those of the side sections 10, the middle section 9, and the side sections 10, respectively, and the dimensions in the direction perpendicular to the direction in which the main truss 2 extends are the same. The two lifting areas 8 and the splicing area 7 form the construction area 6. Preferably, as shown in fig. 6, the dimensions of the construction area 6 in the direction perpendicular to the extending direction of the main truss 2 (i.e., the dimensions of the hoisting area 8 and the splicing area 7 in the direction perpendicular to the extending direction of the main truss 2) are slightly larger than the dimensions of the projection of the main truss 2 on the ground; in the presence of the side girders 3, the dimensions of the projection of the main girders 2 and of the side girders 3 in the construction zone 6 onto the ground are slightly larger. As shown in fig. 1 and 5, the lifting area 8 includes a concrete support structure 11 therein.

In this embodiment, the length of the edge segments 10 is as short as possible to stagger the interface between the components of the column-free building. Specifically, the length of the side segment 10 is determined according to the length of the underground pipe gallery of the concrete support structure 11. Illustratively, the two side sections 10 of the present embodiment are each set to be 7m in length, and thus the middle section 9 is 86.8m in length.

Preferably, as shown in fig. 4, the middle section 9 of the main truss 2 is divided into a first section 91, and identical second 92 and third 93 sections. The middle section 9 comprises in sequence a second section 92, a first section 91 and a third section 93. The length of the second and third sections 92, 93 is determined by the length of the material forming the main truss 2. Illustratively, the second and third sections 92, 93 of the present embodiment are about 10m in length, and thus the first section 91 is about 66.8m in length. Accordingly, as shown in fig. 5, the splicing section 7 is divided into a first splicing section 71, a second splicing section 72, and a third splicing section 73. The first splicing section 71 corresponds to the first section 91, and the second and third splicing sections 72 and 73 correspond to the second and third sections 92 and 93, respectively.

Step B, as shown in fig. 5, 6, 8, 9 and 10, a jig frame 12 is provided at the splicing area 7, the middle section 9 is spliced on the jig frame 12, then a lifting tower 13 is provided at the splicing area 7, and the middle section 9 is lifted by the lifting tower 13.

Preferably, the jig frame 12 and the lifting tower 13 may be formed in a manner known in the art. As shown in fig. 9 and 10, exemplary steel pipes of P245 x 12 to P455 x 20 are selected as the uprights of the jig frame 12; wherein the upper chord butt joint position is a double-assembly vertical rod and is connected by P203 x 6 steel pipes; two adjacent groups of assembled jig frame 12 vertical rods are connected by P1333 x 6 and more steel pipes; the top parts of the spliced vertical rods are connected by H-shaped or box-shaped short beams; the lower parts of the assembled clamping fixture 12 of each group are connected by H400 x 13 x 21. The jig frame 12 is disposed at a predetermined position corresponding to the truss, and the bottom of the jig frame 12 is disposed on the roadbed box 14 or the steel plate 15.

Illustratively, as shown in fig. 10, the lifting tower 13 is in a three-limb lattice structure, and the main pipe is assembled by using standard steel pipe joints with phi 609 x 16. The standard sections of the steel pipe are 6m, 4m, 2m and other different lengths, flanges are arranged at two ends of the steel pipe, the steel pipe is connected by using high-strength bolts, and the standard sections of the steel pipe are combined according to the required height. And the four main pipes are tied by using steel pipes with diameter of 133 x 4 and diameter of 168 x 4 to form a lattice tower, and the steel pipes are connected with each other and the connecting plate is just connected with the steel pipes with diameter of 609 x 16. Preferably, the weld height is not less than 10mm by a welded connection. The top of the frame is provided with H-shaped steel of double-spliced HN900 x 300 as a conversion beam, PL20 steel plates 15 are arranged between phi 609 x 16 support pipes and the conversion beam and are connected by high-strength bolts, the two sides of the lower flange of the conversion beam are fully welded with the steel plates 15 (at non-bolt positions), and the height of a welding seam is not less than 20mm; the double-spliced HN588 x 300 is used as a lifting beam to be arranged on a double-spliced HN900 x 300 conversion beam, and the lifting beam is just connected with the conversion beam. Preferably, the weld height is not less than 14mm by a welded connection.

Preferably, the first section 91 is assembled on the jig 12 of the first assembly area 71, after which the lifting tower 13 is arranged in the assembly area 7, after which the second section 92 and the third section 93 are assembled in the second assembly area 72 and the third assembly area 73, respectively, after which the second section 92 and the third section 93 are welded to the first section 91 so as to form an integrated middle section 9, after which the middle section 9 is lifted by means of the lifting tower 13.

Preferably, the position of the jig frame 12 is the projected position of the main truss 2 on the ground. Preferably, as shown in fig. 10, the lifting tower 13 and the jig frame 12 are disposed on the same roadbed box 14 of the column-free building so as to form an integrated structure, thereby reducing the tool consumption. The main truss 2 is thus in the installed position after being assembled on the jig frame 12, welded and lifted by means of the lifting tower 13.

Preferably, the position of the lifting point of the middle section 9 of the main girder 2 is determined before the middle section 9 of the main girder 2 is lifted. Specifically, simulating a lifting process of the steel truss and deflection values generated in the lifting process by calculation software, and presetting positions and numbers of lifting points of the truss; performing construction simulation, ensuring that the stress and deformation of the component are within the standard allowable range in the lifting process, and determining the optimal lifting point position and lifting force required by the lifting point; and verifying the feasibility of the truss lifting point on site, and determining the final lifting point position. Each lifting point is provided with 2 100t oil cylinders, and the lifting points are removed after the lifting is in butt joint with the support truss. 2 100t oil cylinders are respectively arranged at each lifting point during lifting, so that the butt joint precision between the middle section 9 and the side sections 10 can be improved, and the truss is prevented from being displaced.

Preferably, the lifting of the middle section 9 of the main girder 2 is controlled. And synchronous control of all lifting points is adopted during lifting. And carrying out simulation analysis on the engineering integral steel truss by finite element analysis software, selecting a rod piece with larger stress and a region with larger deformation in a calculation result as a monitoring object, arranging stress monitoring points at the same positions on the left side and the right side of the rod piece so as to ensure the reliability of monitoring data, and arranging measurement monitoring points at the periphery of a midspan lifting point. According to the number of the sensors, data are collected once in three minutes at the monitoring frequency, the data are collected in real time in the lifting process, and the reasons and influences of abnormal data are analyzed after the data are abnormal. And after the dangerous source factors are eliminated, and after the lifting is finished and before the structure is unloaded, the monitoring frequency is ten minutes to acquire data once, so that the error is accurately and effectively controlled to be minimized.

And C, hoisting the pre-assembled side sections 10 in the hoisting area 8, fixing the side sections 10 on a concrete supporting structure 11 as shown in fig. 7, and connecting the middle section 9 and the side sections 10 together, for example, by welding, so as to form the integrated main truss 2. Preferably, the lifting is performed by a crane, as shown in fig. 8. The hoisting sequence of the edge sections 10 is to hoist one edge section 10 first and then hoist the other edge section 10. Specifically, the side section 10 of the main truss 2 is hoisted using, for example, a 100t crawler crane, and temporary supports are provided below the side section 10.

As described above, the column-free building includes the concrete supporting structure 11 and the steel structure 1, and the steel structure 1 includes the main girder 2, the side girder 3, the sub-girder 4, and the roof girder 5, see fig. 1 and 2. The method for installing the steel structure 1 of the column-free building of the present invention adopts the method for installing the main truss 2 described above. The steps of the present embodiment are described below:

step 1, a plurality of construction areas 6 are arranged on the site of the column-free building, as shown in fig. 6. As shown in fig. 5, each construction zone 6 comprises two lifting zones 8 and a splicing zone 7. Specifically, a plurality of construction areas 6 are arranged side by side in a direction perpendicular to the extending direction of the main truss 2.

Step 2, repeating steps a, B and C in the central construction zone 6 among the plurality of construction zones 6, so as to install a plurality of main trusses 2 in the central construction zone 6. Preferably, in step B, lifting the middle section 9 of the main truss 2 comprises lifting a pre-assembled secondary truss 4 connected below the middle section 9, the secondary truss 4 extending in a direction perpendicular to the main truss 2. In addition, it is preferable that in step B, the middle section 9 of the lifting main truss 2 further includes lifting the roof girder 5 connected to an upper portion of the middle section 9, and an extending direction of the roof girder 5 is perpendicular to the main truss 2. It is apparent that lifting the middle section 9 of the main girder 2 may comprise lifting the pre-assembled sub-girders 4 connected below the middle section 9 and the roof girder steel 5 connected at the upper part of the middle section 9 at the same time.

And 3, after the multiple main trusses 2 are installed in place, hoisting the pre-assembled side truss frames 3 between the multiple main trusses 2 in a hoisting area 8. Preferably, the hoisting is performed by a crane.

Step 4, repeatedly performing steps 1 to 3 in the adjacent construction area 6 on one side of the centered construction area 6, and then repeatedly performing steps 1 to 3 in the adjacent construction area 6 on the other side of the centered construction area 6, so as to install a plurality of main trusses 2 in each construction area 6.

Preferably, after step 3, before step 4, the method of installing a steel structure 1 of a column-free building of the present application may further comprise the steps of: step D, after the side truss 3 in the step 3 is lifted, unloading the structure; step E, after the unloading of the structure is completed, the jig frame 12 and the lifting tower 13 are removed.

Illustratively, as shown in FIG. 1, the above method is used for installation of a steel structure 1 of a column-free building comprising eleven main trusses 2. The ground (on the jig frame 12) sectional assembly is carried out in the assembly area 7, the first lifting area is a fourth to seventh truss main truss 2 (from left to right in the figure) and a secondary truss 4 and a roof steel girder 5 which are connected, after lifting in place, the side section 10 of one end of the main truss 2 of the non-column building is lifted by using a 100t crawler crane, a temporary support is arranged below the main truss 2, the side section 10 of the main truss 2 of the other end is lifted by using a 200t automobile crane outside the span, and then the side truss 3 is lifted by using a 100t crawler crane. After the side truss 3 and the roof girder 5 are installed, structural unloading is performed in the splicing area 7, and the jig frame 12 and the lifting tower 13 are removed. The installation of another construction area 6 (including the first to third main trusses 2) is then performed, and the installation of yet another construction area 6 (including the eighth to eleventh main trusses 2) is then performed in the same manner as described above.

In the installation method of the main truss 2 and the installation method of the steel structure 1 of the non-column building of the present invention, the execution sequence of each step may be adjusted according to the actual situation, for example, the step of determining the lifting point may be adjusted as the first step of the installation method, as long as the smooth installation of the main truss 2 or the steel structure 1 can be ensured and the same technical effect can be obtained.

The installation method of the steel structure 1 and the main truss 2 adopts ground sectional assembly, lifting and hoisting to carry out high-altitude butt joint, so that the problem of limited field is solved. The assembly is carried out on the ground before lifting, and the overhead workload is greatly reduced. Therefore, the installation method of the steel structure 1 and the main truss 2 solves the field problem, reduces the overhead workload, reduces the construction difficulty and improves the working efficiency; the tool loss is reduced, and the truss is still stably supported; and effectively prevent the truss from shifting during installation and welding. The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (10)

1. A method of installing a main truss (2) of a column-less building comprising a concrete support structure (11) and said main truss (2), characterized in that the method of installing comprises the steps of:

step A, dividing the main truss (2) into a middle section (9) and two identical side sections (10), setting an assembling area (7) and two hoisting areas (8) on a site of a non-column building, wherein the main truss (2) sequentially comprises the side sections (10), the middle section (9) and the side sections (10), the assembling area (7) corresponds to the middle section (9), the two hoisting areas (8) respectively correspond to the two side sections (10), and the hoisting areas (8) comprise the concrete supporting structure (11);

step B, arranging a jig frame (12) in the splicing area (7), splicing the middle section (9) on the jig frame (12), arranging a lifting tower (13) in the splicing area (7), and lifting the middle section (9) by using the lifting tower (13); and

c, hoisting the pre-assembled side sections (10) in the hoisting area (8), fixing the side sections (10) on the concrete supporting structure (11), and connecting the middle section (9) and the side sections (10) together so as to form the integrated main truss (2); wherein one of the side sections (10) is hoisted first, and then the other side section (10) is hoisted.

2. The method of installation according to claim 1, wherein,

in the step A, the middle section (9) is divided into a first section (91) and identical second section (92) and third section (93), wherein the middle section (9) sequentially comprises the second section (92), the first section (91) and the third section (93); divide into the district (7) of assembling and assemble district (71), second and assemble district (72) and third and assemble district (73), wherein, first district (71) of assembling corresponds to first section (91), second is assembled district (72) and third and is assembled district (73) and correspond respectively second section (92) and third section (93).

3. The method of installation according to claim 2, wherein,

in the step B, the first section (91) is assembled on the jig frame (12) of the first assembling area (71), the lifting tower (13) is arranged in the assembling area (7), the second section (92) and the third section (93) are assembled in the second assembling area (72) area and the third assembling area (73) area respectively, the second section (92) and the third section (93) are welded to the first section (91) so as to form an integrated middle section (9), and then the middle section (9) is lifted by the lifting tower (13).

4. The method of installation according to claim 1, wherein,

the lifting tower (13) and the jig frame (12) are arranged on the same roadbed box (14) of the column-free building.

5. The method of installation according to claim 1, wherein,

in the step B, before lifting the middle section (9) of the main truss (2), determining the position of the lifting point of the middle section (9) of the main truss (2); and

and synchronously controlling each lifting point in the lifting process.

6. A method of installing a steel structure (1) of a pillarless building comprising a concrete support structure (11) and a steel structure (1), the steel structure (1) comprising a main truss (2), side trusses (3), secondary trusses (4) and roof girders (5), characterized in that the method of installing a steel structure (1) of a pillarless building employs the method of installing a main truss (2) of a pillarless building according to any one of claims 1 to 5, the method of installing a steel structure (1) of a pillarless building comprising the steps of:

step 1, arranging a plurality of parallel construction areas (6) on a field of a non-column building in a direction perpendicular to the extending direction of a main truss (2), wherein each construction area (6) comprises two hoisting areas (8) and an assembling area (7);

step 2, repeatedly performing the step A, the step B and the step C in the central construction area (6) in a plurality of construction areas (6) so as to install a plurality of main trusses (2) in the central construction area (6);

step 3, after the main trusses (2) of a plurality of trusses are installed in place, hoisting the pre-assembled side truss frames (3) between the main trusses (2) of the truss in the hoisting area (8); and

and 4, repeatedly performing the steps 1 to 3 in the adjacent construction area (6) on one side of the centered construction area (6), and then repeatedly performing the steps 1 to 3 in the adjacent construction area (6) on the other side of the centered construction area (6) so as to install a plurality of main trusses (2) in each construction area (6).

7. The method of installing according to claim 6, wherein,

in the step B, lifting the middle section (9) comprises lifting the pre-assembled secondary truss (4) connected below the middle section (9), and the extending direction of the secondary truss (4) is perpendicular to the main truss (2).

8. The method of installing according to claim 7, wherein,

in the step B, lifting the middle section (9) further comprises lifting a roof steel girder (5) connected to the upper part of the middle section (9), and the extending direction of the roof steel girder (5) is perpendicular to the main truss (2).

9. The method of installing according to claim 8, wherein,

and D, after the side truss (3) in the step 3 is lifted, unloading the structure.

10. The method of installation of claim 9, wherein,

and E, after the unloading of the structure is completed, dismantling the lifting tower (13).