Large-span string truss all-attitude hoisting point setting method

Abstract

The invention discloses a hoisting point setting method for full-attitude hoisting of a large-span string truss. The hoisting point setting method is characterized by comprising the following steps: a, picking up the gravity center; b, determining the type of a hoisting point; and c, determining the position of the hoisting point. The large-span string truss all-attitude hoisting lifting point setting method has the advantages that by reasonably setting the lifting points, the hoisting efficiency, stability and safety of the large-span string truss are improved, all-attitude adjustment of the truss in the hoisting process is achieved, deformation and damage of the truss structure are effectively reduced, after all-attitude hoisting, installation in place is fast, and the hoisting efficiency is high. The construction flexibility and adaptability are improved, the construction cost is reduced, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to a method for setting the lifting points of a steel structure truss, in particular to a method for setting the lifting points of a large-span tensioned truss in full posture hoisting. Background Art

[0002] With the development of modern construction technology, large-span steel structure trusses have been widely used in various types of buildings. As an important structural form, large-span string trusses have the advantages of light weight, high strength, and fast construction speed. However, during the hoisting process, how to reasonably set the hoisting points to ensure the safe and stable hoisting of the trusses has always been a key issue in construction.

[0003] The traditional method of setting the hanging points usually only considers the overall balance of the truss, ignoring the full posture characteristics of the truss. It cannot meet the needs of full posture adjustment and requires secondary adjustment with a fall chain, resulting in low construction efficiency and high safety risks.

[0004] Therefore, the known truss suspension point setting method has the above-mentioned inconveniences and problems. Summary of the invention

[0005] The purpose of the present invention is to provide a safe and reliable method for setting the lifting points of a large-span cable-stayed truss in all postures.

[0006] To achieve the above purpose, the technical solution of the present invention is: A method for setting the lifting points of a large-span full-stance hoisting truss, wherein the truss is provided with two upper chords and one lower chord, a web is provided between the upper chord and the lower chord, and a plurality of connecting rods are provided between the two upper chords, and the method is characterized in that the method comprises the following steps: a. Pick up the center of gravity. In the steel structure TEKLA software, pick up the center of gravity coordinates of the composite string truss in the hoisting posture and import it into the drawing in CAD; b. Determine the type of lifting points, design the "four-point lifting" according to the shape, weight and size characteristics of the lifting object, combined with the design parameters of the string truss and the performance of the lifting equipment; c. Determine the position of the hanging point, design the hanging point o on the plumb line of the hook at a position 4 meters away from the composite truss, take the hanging point o as the center, make the first cone at an angle of 60 degrees, make the first cone intersect with the two upper chords, and obtain four hanging points A1, B1, C1, and D1 on the two upper chords; then make the second cone at an angle of 45 degrees, make the second cone intersect with the two upper chord tubes to obtain four hanging points A2, B2, C2, and D2, set the four hanging points A, B, C, and D at the intersection of the upper chord and the connecting rod at the maximum bearing capacity position between A1A2, B1B2, C1C2, and D1D2 respectively, and connect OA, OB, OC, and OD with slings.

[0007] The method for setting the lifting points of the large-span cable-stayed truss in all-attitude hoisting of the present invention can be further implemented by adopting the following technical measures.

[0008] The aforementioned method, wherein the truss is a composite string truss.

[0009] In the aforementioned method, the ground assembled tire frame is assembled in a lifting posture.

[0010] In the aforementioned method, the material of the chord truss is steel pipe.

[0011] In the above method, the truss string frame is assembled on the ground according to the design drawing, and the elevation of the truss string frame is controlled during the assembly process to ensure that the posture of the truss string is consistent with the installation posture and angle.

[0012] After adopting the above technical solution, the method for setting the lifting points of the large-span cable-stayed truss in all postures has the following advantages: 1. By setting the lifting points reasonably, the lifting efficiency, stability and safety of the large-span string truss are improved; 2. The truss can be adjusted in full posture during the hoisting process, effectively reducing the deformation and damage of the truss structure. After full posture hoisting, the installation is fast; 3. Improve construction flexibility and adaptability, reduce construction costs, and shorten construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the full-stance hoisting and lifting point arrangement of a large-span cable-stayed truss according to an embodiment of the present invention.

[0014] In the figure: 1 belly member, 2 upper chord, 3 lower chord, 4 boom, 5 plumb line, 6 connecting rod. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with embodiments and accompanying drawings.

[0016] Example 1 The method for setting the hoisting points of a large-span string truss in full posture hoisting of the present invention requires the composite string truss to be hoisted in full posture with a span of 66.6 meters, a width of 6.4 meters, and a weight of 80.5 tons. The composite string truss is required to be rotated 5 degrees for hoisting (the specific angle is calculated according to the height difference of the supports at both ends of the string truss at the construction site), and the assembly frame is set according to the calculated angle, and the full-posture "vertical assembly method" ground assembly is performed. The ground assembly frame is assembled according to the lifting posture. According to the design drawings, the frame is assembled vertically on the ground, and the frame elevation is strictly controlled during the assembly process to ensure that the truss posture is consistent with the installation posture and angle.

[0017] Please refer to Figure 1 , Figure 1It is a schematic diagram of the structure of the full-stance hoisting and lifting point arrangement of a large-span cable-stayed truss according to an embodiment of the present invention.

[0018] The method for setting the lifting points of a large-span cable-stayed truss in all postures comprises the following steps: (1) Pick up the center of gravity. In the steel structure TEKLA software, pick up the center of gravity coordinates of the composite string truss in the hoisting posture and import it into the drawing in CAD; (2) Determine the type of lifting points. Design a "four-point lifting" based on the shape, weight, and size of the lifting object, combined with the design parameters of the truss and the performance of the lifting equipment.

[0019] (3) Determine the position of the lifting point. The lifting height requirement must be met at the same time. In the mechanical arm length, if there are height restrictions in the construction area, the height requirement must be met. The angle between the hook plumb line and the wire rope is in the range of 60o-45o. On the hook plumb line 5, 24 meters away from the upper chord of the composite truss, design the lifting point o. With the lifting point o as the center, make a cone with an angle of 60o, intersecting with the four lifting points A1, B1, C1, and D1 of the upper chord of the truss; make the second cone with an angle of 45o, intersecting with the four lifting points A2, B2, C2, and D2 of the upper chord of the composite tension truss. Within the range of A1A2, B1B2, C1C2, and D1D2, select the position with the maximum bearing capacity. At the intersection of the upper chord 2 and the connecting rod 6, design four lifting points A, B, C, and D. Connect OA, OB, OC, and OD as slings to complete the lifting point setting.

[0020] The present invention has substantial characteristics and significant technical progress. The method for setting the hoisting points of the large-span cable-stayed truss in full posture hoisting reduces the uncertainty in the actual hoisting process through computer simulation and optimization, improves the construction progress, ensures the construction quality, reduces the cost, and is welcomed by the operators, management and user units.

[0021] The method for setting the lifting points of the large-span cable-stayed truss in full posture was used in the Guangzhou exhibition project with remarkable results. The truss has a span of 66.6 meters, a width of 6.4 meters, and a weight of 80.5 tons. Four lifting points are designed based on the structural analysis of the truss. During the lifting process, the composite cable-stayed truss is fully lifted. The work efficiency is greatly improved, the safety hazards of the lifting process are eliminated, and the deformation and damage of the truss structure are effectively reduced.

[0022] The above embodiments are only for the purpose of illustrating the present invention, but not for limiting the present invention. A person skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A method for setting the lifting points of a large-span chord truss in all-position hoisting, wherein the chord truss is provided with two upper chord rods (2) and a lower chord rod (3), a web rod (1) is provided between the upper chord rod (2) and the lower chord rod (3), and a plurality of connecting rods (6) are provided between the two upper chord rods, characterized in that The following steps are involved: a. Pick up the center of gravity. In the steel structure TEKLA software, pick up the center of gravity coordinates of the composite string truss in the hoisting posture and import it into the drawing in CAD; b. Determine the type of lifting points, and design "four-point lifting" according to the shape, weight and size characteristics of the lifting object, combined with the design parameters of the string truss and the performance of the lifting equipment; c. Determine the position of the hanging point. Design a hanging point o at a position 4 meters away from the composite truss on the plumb line (5) of the hook. Take the hanging point o as the center and make the first cone at an angle of 60 degrees. Make the first cone intersect with the two upper chord rods to obtain four hanging points A1, B1, C1, and D1 on the two upper chord rods. Then make the second cone at an angle of 45 degrees. Make the second cone intersect with the two upper chord tubes to obtain four hanging points A2, B2, C2, and D2. Set the four hanging points A, B, C, and D at the intersection of the upper chord rod (2) and the connecting rod (6) at the maximum bearing capacity between A1A2, B1B2, C1C2, and D1D2 respectively. Connect OA, OB, OC, and OD with slings.

2. The method for setting the lifting points of a large-span cable-string truss in all postures according to claim 1, characterized in that: The truss is a composite string truss.

3. The method for setting the lifting points of a large-span cable-string truss in all postures according to claim 1, characterized in that: The ground assembly tire frame is assembled according to the lifting posture.

4. The method for setting the lifting points of a large-span cable-string truss in all postures according to claim 1, characterized in that: The material of the string truss is steel pipe.

5. The method for setting the lifting points of a large-span cable-string truss in all postures according to claim 1, characterized in that: The truss string frame is assembled on the ground according to the design drawing. During the assembly process, the elevation of the truss string frame is controlled to ensure that the posture of the truss string is consistent with the installation posture and angle.

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