CN115404994A - Construction method of irregular curve space three-dimensional truss system of super-large-span building - Google Patents

Abstract

The invention relates to a construction method of a three-dimensional truss system in an irregularly curved space of a super-large-span building, which comprises the steps of constructing an irregularly curved truss model in a computer, completing the processing and manufacture of truss members; determining the position of the tire frame, and assembling the tire frame; The three-dimensional trusses are divided into three groups; the three-dimensional trusses are hoisted in sections according to the irregular curve truss model. The invention solves the problem that the large-diameter and thick-walled rods are difficult to pre-arch during the assembly process of the truss, and solves the problem that the assembly tire frame follows the hoisting construction process in the traditional construction process by selecting a reasonable assembly site location and hoisting construction sequence The difficulty of repeatedly moving and assembling improves the construction efficiency and saves the construction period. In addition, each truss is hoisted in two sections, and the middle position is supported by a "square" as a temporary support tire frame. The deflection and deformation of the entire truss system are minimized during the hoisting process, and the irregular curved shape of the roof steel structure is guaranteed to the greatest extent.

Description

A Construction Method of Irregular Curved Space Three-dimensional Truss System for Super-Large-span Buildings

technical field

The invention relates to the technical field of steel structure engineering, in particular to a construction method for a three-dimensional truss system in an irregular curved space of a super-large-span building.

Background technique

With the improvement of social and economic level, there are more and more demands for large-scale clubhouses, sports centers, and large-scale airports. Super-long-span, complex-shaped and irregular-line trusses are more and more widely used in architectural design. Long-span trusses have light weight. , good load-bearing performance, high strength, and can provide a large space, save materials, and can meet various modeling needs. However, the super-large-span irregular curved truss space three-dimensional truss is difficult to assemble when the site is limited, and it follows the progress of the truss hoisting. The assembled tire frame needs to be moved repeatedly, and the hoisting is extremely difficult. After the truss is installed, the irregular curve shape of the truss itself is guaranteed. Difficulties, how to scientifically, orderly, rationally and economically organize the hoisting of super-large-span trusses will play a key role in the construction quality, progress control, construction period requirements and construction cost control.

Contents of the invention

In order to solve the above existing technical problems, the present invention provides a construction method of a three-dimensional truss system in an irregular curved space of a super-large-span building.

The construction method of a three-dimensional truss system with irregular curved space for a super-large-span building provided by the present invention adopts the following technical scheme:

A construction method for a three-dimensional truss system with an irregular curved space in a super-large-span building, comprising the following steps:

S1. Construct the irregular curve truss model in the computer, and complete the processing and production of the truss members;

S2. Determine the tire frame position according to the irregular curve truss model built in the computer, and assemble the tire frame;

S3. Divide the three-dimensional space trusses into three groups of north side trusses, middle trusses and south side trusses, wherein each truss includes two symmetrically distributed upper chords, two symmetrically distributed lower chords and several truss spaces link;

S4. hoisting the space three-dimensional truss in sections according to the irregular curve truss model;

a1. Hoisting and splicing the north truss and the connecting rod between the north trusses, the north truss and the north truss connecting rod are hoisted sequentially from north to south, and each truss is hoisted in two sections;

a2. Hoisting and splicing the south truss and the connecting rod between the south trusses, the south truss and the south truss connecting rod are hoisted sequentially from south to north, and each truss is hoisted in two sections;

a3. Move the middle truss to the open space in the construction factory area for standby, and remove and assemble the tire frames on the left and right sides;

a4. Hoist the middle truss, wherein the middle truss is three trusses, and the two trusses and connecting rods on the left and right sides are hoisted first.

By adopting the above-mentioned technical scheme, the difficult situation of pre-arching of large-diameter and thick-walled rods during the truss assembly process is solved, and by selecting a reasonable assembly site location and hoisting construction sequence, it solves the problem of assembling tire frames in the traditional construction process. Follow the lifting construction process to repeatedly move and assemble the problem, which improves the construction efficiency and saves the construction period.

Preferably, the step S1 includes:

According to the design drawing, use CAD to complete the establishment of the three-dimensional linear model of the truss;

Into the structural calculation software MIDAS, calculate the vertical displacement value of each node position of the space three-dimensional truss, and the displacement value is the camber value of the node position of the space three-dimensional truss;

The establishment of the spatial three-dimensional truss model is completed through the detailed design software TEKLA, and the arching value is reversely applied to the position of each node of the spatial three-dimensional truss, the processing drawings of the truss rods are completed, and the components of the truss are finally completed The processing and production of parts.

Preferably, said step S2 includes:

The tire frame is arranged between two adjacent three-dimensional trusses.

Preferably, the step S4 includes:

First hoist the first section of each truss, and determine that the position of the truss is fixed according to the irregular curve truss model;

Install the "well" support frame to support the first section of the truss;

The second section of each truss is hoisted, and the space three-dimensional truss is welded at high altitude.

By adopting the above-mentioned technical scheme, each truss is hoisted in two sections during the hoisting process of the trusses, and the "well-shaped" support is used as the temporary support tire frame in the middle position. Structural irregular curved shape.

Preferably, the step of welding each section of truss includes:

Lift the lower chord to the tire frame, control the elevation of each node and fix it by spot welding;

Then assemble and fix the upper chord, then install the connecting rods between the trusses, and carry out all-round high-altitude welding after confirming the assembly size.

Preferably, the step of high-altitude welding comprises:

Measure the relative positioning dimensions of the tire frame and the feature points of the space three-dimensional truss in the computer, and adjust the out-of-tolerance part according to the value;

After the adjustment is completed, the space special-shaped steel pipe truss is welded;

After welding, 100% ultrasonic flaw detection is carried out on the weld.

In summary, the present invention has the following beneficial technical effects:

The construction method of the three-dimensional truss system in the irregular curved space of the super-large-span building described in the present invention solves the difficulty of pre-arching the large-diameter and thick-walled rods during the assembling process of the truss, and selects a reasonable location for the assembling site. And the hoisting construction sequence, which solves the problem of repeated movement and assembly of the assembled tire frame following the hoisting construction process in the traditional construction process, improves the construction efficiency and saves the construction period. In addition, during the hoisting process of the trusses, each truss is hoisted in two sections, and the middle position is supported by a "square" as a temporary support tire frame. The deflection and deformation of the entire truss system are minimized during the hoisting process, and the irregular curved shape of the roof steel structure is guaranteed to the greatest extent. modeling.

Description of drawings

Fig. 1 is a schematic diagram of the hoisting sequence of the truss in the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with accompanying drawing 1 .

The embodiment of the invention discloses a construction method of a three-dimensional truss system in an irregular curved space of a super-large-span building. Referring to Figure 1, the following steps are included:

S1. Construct the irregular curve truss model in the computer, and complete the processing and production of the truss members;

Specifically, use CAD to complete the establishment of the three-dimensional line model of the truss according to the design drawing;

Imported into the structural calculation software MIDAS, the vertical displacement value of each node position of the spatial three-dimensional truss is calculated, and the displacement value is the arching value of the node position of the spatial three-dimensional truss. Roof self-weight load, truss body self-weight load, roof live load, snow load, wind load, calculate the vertical displacement value of each node position of the upper and lower chords of the truss, and this displacement value is the arching value of the truss node position;

The establishment of the truss model is completed through the detailed design software TEKLA, the camber value is reversely applied to the position of each node of the truss, the processing drawings of the truss members are completed, and finally the processing and manufacture of each component member of the truss is completed.

S2. Determine the position of the tire frame according to the irregular curve truss model built in the computer, and assemble the tire frame;

Specifically, the tire frame is arranged between two adjacent three-dimensional trusses.

It should be noted that in order to ensure the safety and reliability of the structural assembly construction, the site for the assembled tire frame needs to be leveled, and the slag should be filled and compacted. The local parts of the poles are leveled with 1.5m*1.5m*0.01m concrete leveling, which is convenient assembled. Due to the limited space, the trusses cannot be assembled as a whole. Each truss is assembled in two sections. The assembly site is set in the middle of the field. The tire frame can assemble 2 trusses at the same time. When assembling the tire frame, according to the hoisting order, first assemble the 4 trusses on the north side, then assemble the 4 trusses on the south side, and finally assemble the 3 trusses in the middle.

S3. Divide the three-dimensional space trusses into three groups of north trusses, middle trusses and south trusses, where each truss includes two symmetrically distributed top chords, two symmetrically distributed bottom chords and several connecting rods between trusses;

It should be noted that the truss structure is an irregular curved space three-dimensional inverted triangular truss with a span of 117 meters and a dead weight ranging from 128 tons to 240 tons. There are 11 trusses in total. The pole width is 4 meters, and the distance between the web poles is 7.5 meters.

S4. According to the irregular curve truss model, the space three-dimensional truss is hoisted in sections;

Specifically, the first section of each truss is hoisted first, and the position of the truss is fixed according to the irregular curve truss model;

Install the "well" support frame to support the first section of the truss; among them, each truss is hoisted in two sections, and when the first section is installed, it is necessary to set up temporary supports for support. The temporary well support is supported by tower crane standard sections, and the size of each standard section is 1.8m*1.8m*2.8m. The standard section is supported by the square tube tower crane standard section, and the length, width and height of each standard section of the tower crane are 1.8m*1.8m*2.8m. The four main bars of the standard section are square tubes 135*135*12, the straight web bars are square tubes 50*50*5, the oblique web bars are square tubes 80*80*6 and square tubes 70*70*6. The standard section and The standard sections are connected by M36 large hexagonal bolts. According to the actual elevation of the upper chord of each main truss, by adding a top conversion tooling support standpipe on the top of the support, the top surface of the support riser and the contact part of the chord are cut into an arc shape, which can effectively fit with the upper chord and prevent sliding cause danger.

Lift the second section of each truss, and perform high-altitude welding on the three-dimensional truss.

a1. Hoisting and splicing the north truss and the connecting rod between the north trusses, the north truss and the north truss connecting rod are hoisted sequentially from north to south, and each truss is hoisted in two sections;

a2. Hoisting and splicing the south truss and the connecting rod between the south trusses, the south truss and the south truss connecting rod are hoisted sequentially from south to north, and each truss is hoisted in two sections;

a3. Move the middle truss to the open space in the construction factory area for standby, and remove and assemble the tire frames on the left and right sides;

a4. Hoist the middle truss, wherein the middle truss is three trusses, and the two trusses and connecting rods on the left and right sides are hoisted first.

The optimal hoisting sequence can minimize construction costs, speed up construction progress, and ensure construction safety. First, use a 350-ton crawler crane to hoist the 4 trusses on the north side and the connecting rods between the trusses. The 4 trusses and connecting rods are hoisted sequentially from north to south, and each truss is hoisted in two sections; again, use a 350-ton crawler crane to hoist the 4 trusses on the south side. And connecting rods, 4 trusses and connecting rods are hoisted sequentially from south to north, and each truss is hoisted in two sections; the 3 trusses in the middle part are assembled again, with a total of 6 sections, and they are moved to the open space of the construction plant for standby, and the assembled tire frame is removed ; Use a 350-ton crawler crane to hoist the two trusses and connecting rods on the left and right sides of the middle truss again. After the hoisting is completed, remove the crawler crane, and finally use two 500-ton truck cranes to lift each section of the middle truss.

Specifically, the steps of welding each truss include:

Hoist the lower chord to the tire frame, control the elevation of each node and fix it by spot welding;

Then assemble and fix the upper chord, then install the connecting rods between the trusses, and carry out all-round high-altitude welding after confirming the assembly size.

It should be noted that during the assembly process of the truss, the lower chord members are hoisted to the assembled tire frame by using a 50t truck crane, the elevation value of each point of the node is measured, and the position of the segmented butt joint is controlled and temporarily fixed by spot welding. The truck crane lifts and positions the upper chord main rod in turn. The upper and lower chord rods are re-measured with theodolite, total station, level and other dimensions, elevations, and positions. After the size is correct, the web rods are assembled. Welding is carried out with lateral symmetrical balance to minimize the deformation caused by welding.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, and therefore should not be construed as limiting the present invention; the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance, and unless otherwise Clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a Electrical connection; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention, so: all equivalent changes made according to the structure, shape and principle of the present invention should be covered by the protection scope of the present invention Inside.

Claims (6)

1. A method for construction of a three-dimensional truss system with irregular curves in a super-large-span building, characterized in that: comprising the following steps: S1. Construct the irregular curve truss model in the computer, and complete the processing and production of the truss members; S2. Determine the tire frame position according to the irregular curve truss model built in the computer, and assemble the tire frame; S3. Divide the three-dimensional space trusses into three groups of north side trusses, middle trusses and south side trusses, wherein each truss includes two symmetrically distributed upper chords, two symmetrically distributed lower chords and several truss spaces link; S4. hoisting the space three-dimensional truss in sections according to the irregular curve truss model; a1. Hoisting and splicing the north truss and the connecting rod between the north trusses, the north truss and the north truss connecting rod are hoisted sequentially from north to south, and each truss is hoisted in two sections; a2. Hoisting and splicing the south truss and the connecting rod between the south trusses, the south truss and the south truss connecting rod are hoisted sequentially from south to north, and each truss is hoisted in two sections; a3. Move the middle truss to the open space in the construction factory area for standby, and remove and assemble the tire frames on the left and right sides; a4. Hoist the middle truss, wherein the middle truss is three trusses, and the two trusses and connecting rods on the left and right sides are hoisted first. 2. The construction method of a three-dimensional truss system with irregular curved spaces for super-large-span buildings according to claim 1, characterized in that: in the step S1, it includes: According to the design drawing, use CAD to complete the establishment of the three-dimensional linear model of the truss; Into the structural calculation software MIDAS, calculate the vertical displacement value of each node position of the space three-dimensional truss, and the displacement value is the camber value of the node position of the space three-dimensional truss; The establishment of the spatial three-dimensional truss model is completed through the detailed design software TEKLA, and the arching value is reversely applied to the position of each node of the spatial three-dimensional truss, the processing drawings of the truss rods are completed, and the components of the truss are finally completed The processing and production of parts. 3. The construction method of a three-dimensional truss system with irregular curved spaces for super-large-span buildings according to claim 1, characterized in that: in the step S2, it includes: The tire frame is arranged between two adjacent three-dimensional trusses. 4. The construction method of a three-dimensional truss system with irregular curved spaces for super-large-span buildings according to claim 1, characterized in that: in the step S4, it includes: First hoist the first section of each truss, and determine that the position of the truss is fixed according to the irregular curve truss model; Install the "well" support frame to support the first section of the truss; The second section of each truss is hoisted, and the space three-dimensional truss is welded at high altitude. 5. The construction method of a three-dimensional truss system in an irregularly curved space in a super-large-span building according to claim 4, wherein the step of welding each truss comprises: Lift the lower chord to the tire frame, control the elevation of each node and fix it by spot welding; Then assemble and fix the upper chord, then install the connecting rods between the trusses, and carry out all-round high-altitude welding after confirming the assembly size. 6. The construction method of a three-dimensional truss system with irregular curves in super-large-span buildings according to claim 5, wherein the high-altitude welding step comprises: Measure the relative positioning dimensions of the tire frame and the feature points of the space three-dimensional truss in the computer, and adjust the out-of-tolerance part according to the value; After the adjustment is completed, the space special-shaped steel pipe truss is welded; After welding, 100% ultrasonic flaw detection is carried out on the weld.

Images