Large-span three-pipe truss overturning and hoisting device and method

Abstract

The invention belongs to the technical field of building steel structure construction, and discloses a large-span three-pipe truss overturning and hoisting device which comprises a crane and an inverted triangular truss, and the inverted triangular truss comprises a truss lower side upper chord, a truss upper side upper chord, a lower chord and a web member; the two ends of the truss lower side upper chord and the truss upper side upper chord are fixedly connected with four steel wire ropes I with the same length; through cooperation of the crane, the winch and other devices, 90-degree overturning of the large-span inverted triangular truss can be achieved; in the overturning process, double chord members are always kept stressed, and deformation of the inverted triangular truss caused by stress of a single chord member is avoided; the gravity center of a component is modeled and analyzed to select hoisting points of the inverted triangular truss, so that the hoisting points are uniformly stressed and stably hoisted in the hoisting process of the inverted triangular truss; the lifting balance compensation mechanism is additionally arranged below the lifting hook, so that the problems of non-uniform stress of a single lifting point and unstable lifting posture during multi-point lifting caused by length errors of a steel wire rope are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of building steel structure construction, and in particular relates to a turnover hoisting device and method for a large-span three-tube truss. Background Art

[0002] With the development of the construction industry, the demand for large-space buildings is increasing, and large-span truss structures are widely used in such buildings. To increase the assembly surface area and thus assembly efficiency, large-span truss assembly cradles are often installed horizontally. Therefore, during the large-span truss hoisting construction process, the large-span truss must be vertically flipped 90°.

[0003] The existing technology generally adopts the method of multiple mobile cranes cooperating at low altitude to realize the flipping operation of large-span trusses. However, the use cost of large machinery such as mobile cranes is high, and the method of multiple cranes cooperating with each other to complete the flipping also has the problems of complex operation and high safety risks. For example, the patent with publication number CN216038318U discloses a non-in-situ one-time lifting and flipping structure for large-span trusses. Although it solves the problem of multi-device coordination lifting and realizes single-device lifting to reduce costs, the chord rod is subjected to force on one side during the flipping process. The large-span truss has a large dead weight. The force on the chord rod on one side can easily cause the internal force of the local rod to exceed the bearing capacity limit, causing the truss to deform, and ultimately causing quality problems. Summary of the Invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a large-span three-tube truss flip hoisting device and method, which solves the problem of truss deformation caused by large force on the chord on one side.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a large-span three-tube truss flip hoisting device, comprising a crane and an inverted triangular truss, the inverted triangular truss comprising a truss lower upper chord, a truss upper upper chord, a lower chord and a web; four steel wire ropes of equal length are fixedly connected to both ends of the truss lower upper chord and the truss upper upper chord, the other ends of the four steel wire ropes are fixedly connected to a hoisting balance compensation mechanism, one end of the lower chord is fixedly connected to a steel wire rope 2, and the other end of the steel wire rope 2 is fixedly connected to a winch mechanism, the winch mechanism is arranged at the top of the lifting boom, the lifting boom is arranged in an array on a roadbed box bracket along the extension direction of the inverted triangular truss, and the roadbed box bracket is fixedly connected to the truss bracket; wherein, the lifting balance compensation mechanism comprises a balance plate, a spherical lifting ring is provided in the middle of the balance plate, and lifting ears are respectively provided at the four corners of the bottom of the balance plate.

[0006] Preferably, the top of the lifting lug is connected to the hook of the crane, the four steel ropes are respectively fixed to the lifting lugs, and the balance plate is made of a Q345B steel plate with a size of 1500 mm square and a thickness of 50 mm.

[0007] Preferably, there are four lifting booms, which are installed at the most reasonable lifting point of the lower chord and arranged symmetrically on both sides. The distance between the lifting boom and the most reasonable lifting point is less than 1 / 4 of the total length of the truss, and the distance between the lifting boom close to the side of the inverted triangle truss and the edge of the inverted triangle truss is less than 1 / 8 of the total length of the inverted triangle truss.

[0008] A method for flipping and hoisting a large-span three-tube truss is as follows: S1. After the horizontal assembly of the inverted triangle truss is completed, the Telka software is used to model the component to simulate the uniformly distributed load α, and the most reasonable hanging point position is selected where the absolute value of the negative bending moment is equal to the positive bending moment in the mid-span; S2. Mark the optimal hanging point positions analyzed by Telka software on the lower upper chord and upper upper chord of the inverted triangle truss. S3. Connect and secure the ends of the four wire ropes 1 to the lower upper chord of the truss, the marked areas of the upper upper chord of the truss, and the lifting lugs. Connect the spherical lifting eye to the crane hook. Connect the ends of the wire rope 2 to the lower chord and the winch mechanism. Complete the preparations. S4. Synchronously lift the hoisting balance compensation mechanism and the winch mechanism. The inverted triangle truss remains in a lying position and leaves the roadbed box bracket. After lifting 50cm, the wire ropes on both sides stop lifting. Synchronously release all the wire ropes, slowly lift the crane hook, and coordinate to complete the truss flipping action. S5. When the second wire rope is completely released and no longer stressed, all the lifting points on the lower chord are released. Under the action of the lifting balance compensation mechanism, the four wire ropes connected to the upper chord on the lower side of the truss and the upper chord on the upper side of the truss are evenly stressed. The lifting posture of the component is stable, and the next construction operation is carried out.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention cooperates with devices such as cranes and winches to realize a 90° flip of a large-span inverted triangular truss, and enables a single crane to complete the flipping operation of the inverted triangular truss, thereby reducing construction costs; ensures that the double chords are always stressed during the flipping process, avoiding quality risks caused by deformation of the inverted triangular truss due to the stress on the single chord; selects the lifting points of the inverted triangular truss by analyzing the center of gravity of the component through modeling, so that the lifting points of the inverted triangular truss are evenly stressed and the lifting is stable during the lifting process; and by adding a lifting balance compensation mechanism under the hook, the problem of uneven stress on a single lifting point and unstable lifting posture during multi-point lifting due to errors in the length of the wire rope is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic side view of the structure of the present invention before lifting; Figure 2 This is a front view schematic diagram of the present invention before hoisting; Figure 3 This is a side view of the present invention after hoisting; Figure 4 This is a top view of the hoisting compensation device of the present invention; Figure 5 It is a front view schematic diagram of the present invention before hoisting.

[0011] In the figure: 1. Upper chord on the lower side of the truss; 2. Upper chord on the upper side of the truss; 3. Lower chord; 4. Roadbed box bracket; 5. Lifting boom; 6. Winch mechanism; 7. Lifting balance compensation mechanism; 701. Balance plate; 702. Spherical lifting ring; 703. Lifting lug; 8. Truss bracket. DETAILED DESCRIPTION

[0012] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0013] like Figures 1 to 5 As shown, the present invention provides a large-span three-tube truss flip hoisting device and method, including a crane and an inverted triangular truss, the inverted triangular truss including a truss lower upper chord 1, a truss upper upper chord 2, a lower chord 3 and a web; four steel wire ropes of equal length are fixedly connected to both ends of the truss lower upper chord 1 and the truss upper upper chord 2, the other ends of the four steel wire ropes are fixedly connected to a hoisting balance compensation mechanism 7, one end of the lower chord 3 is fixedly connected to a steel wire rope 2, the other end of the steel wire rope 2 is fixedly connected to a hoisting mechanism 6, the hoisting mechanism 6 is arranged on the top of a lifting boom 5, the lifting boom 5 is arranged in an array on a roadbed box bracket 4 along the extension direction of the inverted triangular truss, and a truss bracket 8 is fixedly connected to the roadbed box bracket 4; wherein, the hoisting balance compensation mechanism 7 includes a balance plate 701, a spherical lifting ring 702 is provided in the middle of the balance plate 701, and lifting ears 703 are respectively provided at the four corners of the bottom of the balance plate 701.

[0014] like Figure 4 and Figure 5 As shown, the top of the lifting lug 703 is connected to the hook of the crane, and four steel wire ropes are fixed to the lifting lugs 703 respectively. The balance plate 701 is made of a Q345B steel plate with a size of 1500 mm square and a thickness of 50 mm. Because the spherical lifting ring 702 and the balance plate 701 can move freely to a certain extent, under the action of the gravity of the component, the structure similar to the shoulder pole beam can compensate for the length deviation of the wire rope, ensuring that the distance between the lifting ear 703 and the lifting point of the component is equal, the four wire ropes are evenly stressed, and the component remains balanced in space.

[0015] Preferably, four lifting booms 5 are provided, and the four lifting booms 5 are installed at the most reasonable lifting point of the lower chord 3 and are arranged symmetrically on both sides. The distance between the lifting boom 5 and the most reasonable lifting point is less than 1 / 4 of the total length of the truss, and the distance between the lifting boom 5 close to the side of the inverted triangle truss and the edge of the inverted triangle truss is less than 1 / 8 of the total length of the inverted triangle truss.

[0016] A method for flipping and hoisting a large-span three-tube truss is as follows: S1. After the horizontal assembly of the inverted triangle truss is completed, the Telka software is used to model the component to simulate the uniformly distributed load α, and the most reasonable hanging point position is selected where the absolute value of the negative bending moment is equal to the positive bending moment in the mid-span; S2. Mark the optimal lifting point positions analyzed by Telka software on the lower upper chord 1 and the upper upper chord 2 of the inverted triangle truss; the lifting points of wire rope 1 and wire rope 2 are determined by modeling the center of gravity of the component using Telka software, and are selected symmetrically on both sides of the center of gravity; S3. Connect and secure the ends of the four wire ropes 1 to the lower upper chord 1 of the truss, the upper upper chord 2 of the truss, and the lifting lugs 703. Connect the spherical lifting eye 702 to the crane hook. Connect the ends of the wire rope 2 to the lower chord 3 and the hoisting mechanism 6. Complete the preparations. S4. Synchronously lift the hoisting balance compensation mechanism 7 and the hoisting mechanism 6. The inverted triangle truss remains in a lying position and leaves the roadbed box bracket 4. After lifting 50 cm, the wire ropes on both sides stop lifting. All the wire ropes are slowly released synchronously. The crane hook is slowly lifted to complete the truss flipping action. S5. When the second wire rope is completely released and no longer stressed, all the lifting points on the lower chord 3 are released. Under the action of the lifting balance compensation mechanism 7, the four wire ropes connected to the upper chord 1 on the lower side of the truss and the upper chord 2 on the upper side of the truss are evenly stressed. The lifting posture of the component is stable, and the next construction operation is carried out.

[0017] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0018] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A large-span three-tube truss flip hoisting device, comprising a crane and an inverted triangular truss, characterized in that: The inverted triangle truss comprises a truss lower upper chord (1), a truss upper upper chord (2), a lower chord (3) and a web; four steel wire ropes of equal length are fixedly connected to both ends of the truss lower upper chord (1) and the truss upper upper chord (2); the other ends of the four steel wire ropes are fixedly connected to a hoisting balance compensation mechanism (7); one end of the lower chord (3) is fixedly connected to a steel wire rope; the other end of the steel wire rope is fixedly connected to a hoisting mechanism (6); The mechanism (6) is arranged on the top of the lifting boom (5), and the lifting boom (5) is arranged on the roadbed box bracket (4) in an array along the extension direction of the inverted triangle truss, and the roadbed box bracket (4) is fixedly connected to the truss bracket (8); wherein the lifting balance compensation mechanism (7) includes a balance plate (701), a spherical lifting ring (702) is provided in the middle of the balance plate (701), and lifting ears (703) are respectively provided at the four corners of the bottom of the balance plate (701).

2. The large-span three-tube truss turnover hoisting device according to claim 1 is characterized in that: The top of the lifting lug (703) is connected to the hook of the crane, and the four steel wire ropes are respectively fixed to the lifting lugs (703). The balance plate (701) is made of a Q345B steel plate with a size of 1500 mm square and a thickness of 50 mm.

3. The large-span three-tube truss turnover hoisting device according to claim 1 is characterized in that: There are four lifting jibs (5), which are installed at the most reasonable lifting point of the lower chord (3) and are symmetrically arranged on both sides. The distance between the lifting jib (5) and the most reasonable lifting point is less than 1 / 4 of the total length of the truss, and the distance between the lifting jib (5) on one side of the inverted triangle truss and the edge of the inverted triangle truss is less than 1 / 8 of the total length of the inverted triangle truss.

4. A method for turning over and hoisting a large-span three-tube truss, applied to the large-span three-tube truss turning over and hoisting device according to any one of claims 1 to 3, characterized in that: The operation method is as follows: S1. After the horizontal assembly of the inverted triangle truss is completed, the Telka software is used to model the component to simulate the uniformly distributed load α, and the most reasonable hanging point position is selected where the absolute value of the negative bending moment is equal to the positive bending moment in the mid-span; S2. Mark the optimal hanging point positions analyzed by Telka software on the lower upper chord (1) and the upper upper chord (2) of the inverted triangle truss; S3, connect and fix the two ends of the four steel wire ropes 1 to the lower chord rod (1) of the truss, the upper chord rod (2) of the truss and the lifting lug (703), connect the spherical lifting ring (702) to the crane hook, connect the two ends of the steel wire rope 2 to the lower chord rod (3) and the hoisting mechanism (6), and complete the preparation work; S4, synchronously lifting the hoisting balance compensation mechanism (7) and the winch mechanism (6), the inverted triangle truss keeps lying down and leaves the roadbed box bracket (4), after lifting 50cm, the wire ropes 1 on both sides stop lifting, and all the wire ropes 2 are synchronously and slowly released, and the crane hook is slowly lifted to complete the turning action of the truss; S5. When the second wire rope is completely released and no longer stressed, all the lifting points on the lower chord (3) are released. Under the action of the hoisting balance compensation mechanism (7), the four wire ropes connected to the upper chord (1) on the lower side of the truss and the upper chord (2) on the upper side of the truss are evenly stressed. The hoisting posture of the component is stable, and the next construction operation is carried out.

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