CN116374799A - Hoisting components for in-situ overturning of large components and in-situ overturning method for steel box girders - Google Patents

Abstract

The invention relates to the technical field of steel structure construction, in particular to a hoisting assembly for in-situ turning over of a large component and a method for in-situ turning over of a steel box girder; The movable connection structure connects the steel wire rope with the crane, and the movable connection structure on each side includes at least two movable turning points respectively connected with the steel wire rope and the component, and the two movable turning points are also used as the lifting points of the steel wire rope and the component. The present invention saves the high cost of equipment purchase and the size of the hoisted member is no longer limited; the "in situ turning" of the steel member is also realized by hoisting, and the "movable connection structure" proposed by the present invention has small size and It has almost no weight, so it will not increase the weight of the steel component to be hoisted, nor will it increase the hoisting weight of the hoisting equipment, so that the requirements for hoisting equipment required for the hoisting of large steel components can be reduced.

Description

Hoisting components for in-situ overturning of large components and in-situ overturning method for steel box girders

technical field

The invention relates to the technical field of steel structure construction, in particular to a hoisting assembly for in-situ turning over of a large component and an in-situ turning method for a steel box girder.

Background technique

Due to the advantages of light weight, high strength and good mechanical properties of steel components, many buildings use steel structures as core components. With the continuous development of steel structure application technology, more and more bridges have begun to introduce steel structures as their core components. When bridges use steel structures, they use a core member called a steel box girder. Generally, the processing methods of steel box girders include positive fabrication and reverse fabrication. Among them, the reverse fabrication is the inverted state of the steel box girder with the top plate on the bottom and the bottom plate on the top during manufacture. In order to improve the weldability of the steel box girder In order to meet the needs of seam quality and actual on-site installation, the counter-fabrication method is at the end of the steel box girder manufacturing stage. Before the steel box girder leaves the factory, the steel box girder needs to be turned over to restore the normal state of the top plate on the bottom and the bottom plate on the bottom.

At present, for the "turning over" process of steel box girders, professional turning machines have been developed on the market, which can realize the multi-angle turning work of steel box girders. However, the cost of these turning machines is not low, so it will generate extremely high costs. cost input; secondly, limited by the size of the machine itself, general turning machines can only turn over steel box girders within a certain width and height; moreover, this turning machine generally needs to use a crane to lift the steel box girder from The position of the assembled tire frame is hoisted to the position of the turning machine, and after the turning is completed, it is hoisted away from the position of the machine. There may be many in-field misfortunes and the in-situ turning of the steel box girder cannot be realized.

To sum up, when building "long-span" bridges, the size of the steel box girders used in these bridges is generally larger than that of traditional bridges. Turning over" may have two problems:

1. The size of the steel box girder exceeds the bearing range of the turning machine, and it cannot be "turned over" by the turning machine.

2. It is necessary to hoist the steel box girder from the position of the assembled tire frame to the position of the turning machine with a crane, and lift the steel box girder away from the turning machine after the turning is completed. In this way, it is necessary to carry out multiple in-field relocations, which means that the original position cannot be realized. Turning over, which has higher requirements for the space in the field.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects, and propose a hoisting assembly for large-scale components, especially large-scale steel box girders, to implement "turning over in situ" operations and a method for turning over steel box girders in situ through the assembly.

To achieve the above object, the present invention is achieved in that:

A hoisting assembly for turning over a large component in situ, comprising a movable connection structure arranged at least on both sides of the component and a steel wire rope connecting the movable connection structure with a crane, and the movable connection structure on each side includes at least one wire rope , Two movable turning points connected by components, and the two movable turning points are also used as lifting points for steel wire ropes and components.

In the hoisting assembly for turning large components in situ, the movable connection structure includes a board and lifting lugs arranged on the component, and the board and lifting ears, or between the board and the wire rope, are rotatably connected by a snap ring. , that is, the snap ring is used as a movable turning point at this time.

The above-mentioned hoisting assembly for turning large components in situ, the movable connection structure includes iron chains and lifting lugs arranged on the components, and the two ends of the iron chains are respectively connected with the lifting lugs and steel wire ropes, that is, the iron chains are used as movable rotating parts at this time. point of use.

In the hoisting assembly used for turning over large components in situ, the iron chains are replaced by chains.

A steel box girder turning over method in situ, comprising

Step 1. Establish an active connection structure:

Step 1.1. Weld lifting lugs on the left and right sides of the steel box girder respectively;

Step 1.2, connect the board and the lifting lug through the snap ring;

Step 1.3, connect the board with the hook of the hoisting machine through a wire rope;

Step 2, implement the unilateral roll action of the steel box girder:

Step 2.1. The hoisting machinery on the left and right sides of the steel member synchronously and slowly tighten the wire rope and lift the steel box girder, and the lifting height is controlled at half the bridge width;

Step 2.2. The hoisting machine on the left side of the steel member continues to lift the steel wire rope synchronously and slowly, while the hoisting machine on the right side of the steel member lowers the wire rope synchronously and slowly at this time, so as to achieve the state of unilateral lowering of the steel box girder. At this time, the steel box The beam as a whole rotates clockwise around the right lug and snap ring until the bottom plate (1.1) of the steel box girder touches the board on the right;

Step 2.3. The hoisting machine on the left side of the steel member continues to slowly lift the wire rope. At this time, the hoisting machine on the right side of the steel member slowly lowers the wire rope until the steel box girder (1) is basically vertical;

Step 2.4. The hoisting machine on the right side of the steel member continues to slowly lower the wire rope until the wire rope is completely unstressed and in a loose state. At this time, the connection between the board on the right side of the steel box girder and the wire rope is released and the right The board naturally droops;

Step 3. Realize the "turning over" work of the steel box girder:

Step 3.1, move the hoisting mechanical hook on the original right side of the steel box girder to the left side of the steel box girder;

Step 3.2. Swing the board on the original right side of the steel box girder to the left, or pull the board on the original right side of the steel box girder to make it tilt to the left, and then hook the hoisting mechanical hook on the original right side of the steel box girder again The head is connected with the board on the original right side of the steel box girder through a wire rope;

Step 3.3. The hoisting mechanical hook head on the original right side of the steel box girder slowly lifts the wire rope, and the board card on the original left side of the steel box girder slowly lowers the wire rope at this time. At this time, the steel box girder as a whole rotates clockwise around the original left lifting lug , until the top plate of the steel box girder leans against the original left plate;

Step 3.4, the steel box girder's original left hoisting mechanical hook head further slowly lifts the wire rope until both sides of the steel box girder top plate lean against the boards on both sides at the same time;

Step 3.5. At this time, the hoisting machinery on both sides of the steel box girder is fine-tuned until the steel box girder is in a horizontal posture;

Step 3.6. Slowly lower the wire ropes on both sides of the steel box girder at the same time until the steel box girder falls to its original position and touches the ground, ending the whole process of turning over the steel box girder.

The above steel box girder turning over method in situ sets two lifting lugs on the left side of the steel box girder and respectively connects with the hook heads of two hoisting machines through the movable connection structure and the steel wire rope. The lifting machinery performs the same action.

Compared with the prior art, the hoisting assembly and the in-situ turning method of the steel box girder proposed by the present invention have the following differences and advantages:

1. Propose a "movable connection structure" that embodies "flexibility" characteristics through a rotating connection or a rotatable connection. This kind of movable connection structure is directly arranged on the left and right sides of the member to be hoisted, and then the hoisting operation is performed. Compared with the existing steel structure turning machine, the high equipment purchase cost is saved and the size of the hoisted member is no longer limited.

2. The number of parts required to form the "movable connection structure" proposed by the present invention is small, the structure is simple and the connection is convenient. Workspace requirements for the job are reduced.

3. Even if the "in-situ turning" of the steel member is also realized by hoisting, the "movable connection structure" proposed by the present invention has the characteristics of small size and almost no weight, so it will not increase the weight of the hoisted steel member. The hoisting weight of the hoisting equipment will not be additionally increased, so that the requirements for hoisting equipment required for the hoisting operation of large steel components can be reduced.

Description of drawings

Fig. 1 is a schematic diagram of the first steps of the in-situ turnover method for a steel box girder proposed by the present invention.

Fig. 2 is the second schematic diagram of the steps of the steel box girder turning over method in situ proposed by the present invention.

Fig. 3 is a schematic diagram of the third step of the steel box girder turning over method in situ proposed by the present invention.

Fig. 4 is a schematic diagram of the fourth step of the in-situ turnover method for steel box girders proposed by the present invention.

Fig. 5 is a schematic diagram of steps 5 of the in-situ turnover method for the steel box girder proposed by the present invention.

Fig. 6 is a schematic diagram of steps 6 of the in-situ turnover method for the steel box girder proposed by the present invention.

Fig. 7 is a schematic diagram of steps 7 of the in-situ turnover method for steel box girders proposed by the present invention.

Fig. 8 is a schematic diagram of the eighth step of the in-situ turnover method for the steel box girder proposed by the present invention.

Fig. 9 is a schematic diagram of steps 9 of the in-situ turnover method for steel box girders proposed by the present invention.

Detailed ways

The present invention is further illustrated below by specific examples.

As shown in Figures 1 to 9, a steel box girder turning over method in situ, including

Step 1. Weld the lifting lugs (6.1, 6.2, 6.3) on both sides of the steel box girder, and connect the lifting lugs through the snap ring (5.1, 5.2, 5.3, 5.4, 5.5, 5.6) (6.1, 6.2, 6.3) are connected with the hoisting mechanical hook (2.1, 2.2, 2.3);

Step 2. 1#, 2#, 3# hoisting machines basically synchronously slowly tighten the steel wire ropes (3.1, 3.2, 3.3), and slowly lift the steel box girder (1). The lifting height should be controlled at half the bridge width so that the box body turn over;

Step 3. The 1# and 3# hoisting machines maintain the basic synchronization and continue to slowly lift the wire ropes (3.1, 3.3), and the 2# hoisting machine slowly lowers the wire ropes (3.2) to achieve the effect of the steel box girder (1) turning over. At this time, the steel box girder (1) rotates clockwise around the pin shaft of the snap ring (5.2) until the bottom plate of the steel box girder (1.1) leans against the plate clamp (4.2);

Step 4. The 1#3# hoisting machinery continues to slowly lift the wire ropes (3.1, 3.3), and the 2# hoisting machinery slowly lowers the wire ropes (3.2) to ensure that the steel box girder (1) continues to rotate and turn over. At this time, the steel box girder (1) is relatively clockwise around the pin axis of the snap ring (5.4) until the steel box girder (1) is basically vertical;

Step 5. The 2# hoisting machine continues to lower the wire rope (3.2) slowly until the wire rope (3.2) is completely free of force, and at this time untie the snap ring (5.3);

Step 6. Move the 2# hoisting mechanical hook head (2.2) to the left side of 1# and 3# hoisting mechanical hook heads (2.1, 2.3), swing the clamping plate (4.2) to the left, and then connect the snap ring (5.4 ) and board (4.2);

Step 7. The 2# hoisting machine slowly lifts the wire rope (3.2), and the 1# and 3# hoisting machines slowly lower the wire rope (3.1, 3.3). The shaft rotates clockwise until the top plate (1.2) of the steel box girder leans against the board (4.1, 4.3);

Step 8. The top plate of the steel box girder leans against the boards at both ends (4.1, 4.2, 4.3), and fine-tunes using 1#, 2#, and 3# hoisting machines until the steel box girder is basically level;

Step 9. Slowly put the steel box girder (1) to its original position, and end the whole process of turning over the steel box girder (1).

In the above embodiment, by adding lifting lugs on both sides of the box girder and using boards to convert the stressed object, the problem of frictional shearing between the hoisting steel wire rope and the side of the steel box girder is avoided, and the hinge performance of the snap ring is flexibly utilized. And the thinking of changing the stress points from three stress points to two stress points, and then converting back to three stress points, to achieve the ultimate effect of convenient and quick turning over of the original position of the component.

Further, the above-mentioned embodiments further demonstrate the advantages of the technical solution proposed by the present invention compared with the prior art:

1. Only lifting lugs, snap rings and boards are used, which is convenient for purchasing and processing, with less investment and low cost.

2. The operation is simple and does not involve multiple transfers.

3. If the gantry crane is used as the hoisting machine in the processing plant, this method can greatly reduce the occupation of the turning site.

4. Since this method involves three hoisting machines, compared with one or two hoisting machines in general, the hoisting capacity requirements for a single hoisting machine are not so high, which reduces the performance requirements for a single hoisting machine.

5. The present invention adopts boards, flexibly avoids the friction and shearing between the steel wire rope and the upper and lower top plate edges of the box girder, protects the slings, and ensures the safety of hoisting.

Claims (6)

1. A hoisting assembly for large components turning over in situ, characterized in that: it includes at least an articulated structure arranged on both sides of the component and a steel wire rope connecting the articulated structure with a crane, and the articulated structure on each side The structure at least includes two movable turning points respectively connected with the steel wire rope and the component, and the two movable turning points are also used as the hanging points of the steel wire rope and the component. 2. The hoisting assembly for turning over large components in situ according to claim 1, characterized in that: the movable connection structure includes board clips and lifting lugs arranged on the components, between the board clips and the lifting ears, or The plate card and the wire rope are connected in rotation through a snap ring, that is, the snap ring is used as a movable turning point at this time. 3. The hoisting assembly for turning over a large component in situ according to claim 1, wherein the movable connection structure includes an iron chain and lifting lugs arranged on the component, and the two ends of the iron chain are connected to the lifting lugs respectively. 1. Wire rope connection, that is, the iron chain is used as a movable turning point at this time. 4. The hoisting assembly for in-situ turning over of large components according to claim 1, wherein the iron chains are replaced by chains. 5. A steel box girder turning over method in situ, characterized in that: comprising Step 1. Establish an active connection structure: Step 1.1. Weld lifting lugs on the left and right sides of the steel box girder respectively; Step 1.2, connect the board and the lifting lug through the snap ring; Step 1.3, connect the board with the hook of the hoisting machine through a wire rope; Step 2, implement the unilateral roll action of the steel box girder: Step 2.1. The hoisting machinery on the left and right sides of the steel member synchronously and slowly tighten the wire rope and lift the steel box girder. The lifting height is controlled at half the bridge width or the width of the steel box girder; Step 2.2, the steel box girder leans against the board on the right to give the steel box girder a rightward pulling force through the board and the right lifting lug, so as to prevent the steel box girder from turning over and swinging too much under its own gravity; and the board It is to replace the force of the steel wire rope, to avoid the direct use of the steel wire rope to be worn by the bottom plate of the steel box girder; Step 2.3. The hoisting machine on the left side of the steel member continues to slowly lift the wire rope. At this time, the hoisting machine on the right side of the steel member slowly lowers the wire rope until the steel box girder (1) is basically vertical; Step 2.4. The hoisting machine on the right side of the steel member continues to slowly lower the wire rope until the wire rope is completely unstressed and in a loose state. At this time, the connection between the board on the right side of the steel box girder and the wire rope is released and the right The board naturally droops; Step 3. Realize the "turning over" work of the steel box girder: Step 3.1, move the hoisting mechanical hook on the original right side of the steel box girder to the left side of the steel box girder; Step 3.2. Swing the board on the original right side of the steel box girder to the left, or pull the board on the original right side of the steel box girder to make it tilt to the left, and then hook the hoisting mechanical hook on the original right side of the steel box girder again The head is connected with the board on the original right side of the steel box girder through a wire rope; Step 3.3. The hoisting mechanical hook head on the original right side of the steel box girder slowly lifts the wire rope, and the board card on the original left side of the steel box girder slowly lowers the wire rope at this time. At this time, the steel box girder as a whole rotates clockwise around the original left lifting lug , until the top plate of the steel box girder leans against the original left plate; Step 3.4, the steel box girder's original left hoisting mechanical hook head further slowly lifts the wire rope until both sides of the steel box girder top plate lean against the boards on both sides at the same time; Step 3.5. At this time, the hoisting machinery on both sides of the steel box girder is fine-tuned until the steel box girder is in a horizontal posture; Step 3.6. Slowly lower the wire ropes on both sides of the steel box girder at the same time until the steel box girder falls to its original position and touches the ground, ending the whole process of turning over the steel box girder. 6. The method for turning over steel box girder in situ according to claim 5, characterized in that: two lifting lugs are arranged on the left side of the steel box girder and are respectively connected to the hooks of two hoisting machines through a movable connection structure and a steel wire rope. connected, the two hoisting machines on the left side of the steel box girder perform the same action.

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