Steel box girder hoisting construction method

Abstract

The invention relates to the technical field of hoisting construction, in particular to a steel box girder hoisting construction method which comprises the steps that S1, a cross beam is connected between the lower end of a steel wire rope and a steel box girder, two upper connecting blocks are arranged on a sliding rod at the top of the cross beam, and two lower connecting blocks are arranged at the bottom of the cross beam in a sliding mode; s2, the distance between the two lower connecting blocks is adjusted according to the width of the steel box girder, the distance between the two lower connecting blocks is in direct proportion to the width of the steel box girder, and the cross beam is connected with the steel box girder through the two lower connecting blocks; the distance between the two upper connecting blocks is adjusted according to the width of the steel box girder, the distance between the two upper connecting blocks is inversely proportional to the width of the steel box girder, and the cross beam is connected with the lower end of the steel wire rope through the two upper connecting blocks; and S3, hoisting equipment is connected with the upper end of the steel wire rope through a lifting hook, and then hoisting is conducted. The problem that in the prior art, when different steel box girders are hoisted, the preparation steps are tedious is solved.

Description

Technical Field

[0001] The invention relates to the technical field of hoisting construction, in particular to a steel box girder hoisting construction method. Background Art

[0002] Steel box girder, also known as steel plate box girder, is a common structural form for long-span bridges. It is generally used on bridges with larger spans. It is called steel box girder because of its box-like appearance. Steel box girder needs to be hoisted using hoisting equipment, hooks, wire ropes and rings. Figure 1 As shown. The wire rope 21 will have a safety angle A, which is usually greater than 45°. As the safety angle A increases, the vertical height H between the hook and the steel box girder 4 will increase. At this time, when lifting, the swing amplitude of the steel box girder 4 is large, but the wire rope 21 is better stressed, which is suitable for lifting heavier steel box girders 4. As the safety angle A decreases, the vertical height H between the hook and the steel box girder 4 will decrease. At this time, when lifting, the wire rope 21 is less stressed, but the swing amplitude of the steel box girder 4 is small, which is suitable for lifting lighter steel box girders 4.

[0003] Generally, the wider the steel box girder, the heavier it is. In the prior art, the hoisting equipment needs to replace steel wire ropes with different lengths when hoisting different steel box girders, that is, when hoisting heavier steel box girders, longer steel wire ropes are used to increase the safety angle and ensure that the steel wire ropes have a better force effect when hoisting heavier steel box girders. When hoisting heavier steel box girders, shorter steel wire ropes are used to reduce the safety angle and avoid excessive swing of lighter steel box girders during the hoisting process. However, this means that in the process of hoisting different steel box girders, multiple sets of steel wire ropes of different lengths need to be prepared to cope with the hoisting construction of different steel box girders, and there is a problem that the preparation steps for hoisting construction are relatively cumbersome. Summary of the invention

[0004] In order to solve the problem of complicated preparation steps when hoisting different steel box girders in the prior art, the present application provides a steel box girder hoisting construction method.

[0005] The present invention provides a steel box girder hoisting construction method adopts the following technical solution: A steel box girder hoisting construction method comprises the following steps: S1: A cross beam is connected between the lower end of the steel wire rope and the steel box beam, two upper connecting blocks are slidably arranged on the top of the cross beam, and two lower connecting blocks are slidably arranged on the bottom of the cross beam; S2: According to the width of the steel box girder, the spacing between the two lower connection blocks is adjusted, the spacing between the two lower connection blocks is proportional to the width of the steel box girder, and the crossbeam is connected to the steel box girder through the two lower connection blocks; according to the width of the steel box girder, the spacing between the two upper connection blocks is adjusted, the spacing between the two upper connection blocks is inversely proportional to the width of the steel box girder, and the crossbeam is connected to the lower end of the steel wire rope through the two upper connection blocks; S3: The hoisting equipment is connected to the upper end of the wire rope via a hook, and then hoisting is performed.

[0006] Preferably, in S1, brackets are provided at the lower ends of the two lower connecting blocks, and shapes of the opposing surfaces between the two brackets are respectively formed according to the outer contours of both sides of the steel box girder; in S2, the two brackets are used to support the steel box girder during the lifting process.

[0007] Preferably, in S1, an adjusting rod is rotatably arranged in the cross beam, the adjusting rod rotates around a horizontal axis, the adjusting rod is a double-headed screw having two sections of adjusting threads with opposite rotation directions, and the adjusting rod is threadedly connected to the two lower connecting blocks respectively through the two sections of adjusting threads; in S2, the spacing between the two lower connecting blocks is adjusted by rotating the adjusting rod.

[0008] Preferably, in S1, two annular conveyor belts are arranged in the crossbeam, and the two conveyor belts are respectively located between the two groups of upper connecting blocks and the lower connecting blocks, the upper connecting blocks are connected to the upper surface of the conveyor belts, and the lower connecting blocks are connected to the lower surface of the conveyor belts; in S2, when adjusting the spacing, the two lower connecting blocks drive the two upper connecting blocks to synchronously adjust the spacing through the conveyor belts.

[0009] Preferably, in S1, a locking rod is connected between the upper connecting block and the cross beam; before performing the operation of S2, the locking rod between the upper connecting block and the cross beam is unlocked, and after performing the operation of S2, the locking rod between the upper connecting block and the cross beam is locked.

[0010] Preferably, the angle between the lower end of the steel wire rope and the horizontal plane is taken as the safety angle A. In S2, the safety angle A is greater than 45°, and the adjustment range of the safety angle A is 0-45°.

[0011] Preferably, in S1, a transverse suspension rod is connected between the upper end of the steel wire rope and the hook, the top of the transverse suspension rod is connected to the hook and the bottom is connected to the upper end of the steel wire rope.

[0012] Preferably, in S1, an oblique suspension rod is used instead of the steel wire rope, and two ends of the oblique suspension rod are respectively hinged to the horizontal suspension rod and the upper connecting block.

[0013] Preferably, in S1, the cross beam is erected on the steel box beam to be hoisted on the ground using outriggers.

[0014] Preferably, in S1, the bottoms of both ends of the crossbeam are provided with slots, and the crossbeam is connected to the supporting legs through the slots.

[0015] The beneficial effects of the present invention are: When faced with different steel box girders, it is possible to lift heavier steel box girders at a larger safety angle and to lift lighter steel box girders at a smaller safety angle without replacing the wire rope. This eliminates the need to prepare multiple sets of wire ropes of different lengths to cope with the lifting construction of different steel box girders, thereby solving the problem of complicated preparation steps for lifting different steel box girders in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a brief schematic diagram of hoisting steel box beam in the background technology; Figure 2 It is a brief schematic diagram of using steel wire ropes to hoist different steel box girders in the embodiment of the present application; Figure 3 yes Figure 2 Perspective view of the local structure; Figure 4 It is a simplified schematic diagram of using inclined hangers to hoist different steel box girders in an embodiment of the present application.

[0017] Explanation of the reference numerals: 1. horizontal suspension rod; 21. steel wire rope; 22. inclined suspension rod; 3. horizontal beam; 31. upper connecting block; 32. lower connecting block; 33. bracket; 34. adjusting rod; 35. conveyor belt; 36. locking rod; 4. steel box beam; 5. supporting leg. DETAILED DESCRIPTION

[0018] The following will be combined with the attached Figure 2 -Attached Figure 4 The present invention is further illustrated by the following embodiments.

[0019] This embodiment discloses a steel box girder hoisting construction method.

[0020] Reference Figure 2 and Figure 3 , the steel box girder hoisting construction method includes the following steps: S1: A cross beam 3 is connected between the lower end of the steel wire rope 21 and the steel box beam 4, two upper connecting blocks 31 are slidably arranged on the top of the cross beam 3, and two lower connecting blocks 32 are slidably arranged on the bottom of the cross beam 3; S2: According to the width of the steel box girder 4, the spacing between the two lower connecting blocks 32 is adjusted, and the spacing between the two lower connecting blocks 32 is proportional to the width of the steel box girder 4, and the cross beam 3 is connected to the steel box girder 4 through the two lower connecting blocks 32; according to the width of the steel box girder 4, the spacing between the two upper connecting blocks 31 is adjusted, and the spacing between the two upper connecting blocks 31 is inversely proportional to the width of the steel box girder 4, and the cross beam 3 is connected to the lower end of the steel wire rope 21 through the two upper connecting blocks 31; S3: The hoisting equipment is connected to the upper end of the wire rope 21 through a hook, and then hoisting is performed.

[0021] In the above construction steps, the crossbeam 3 of the upper connecting block 31 and the lower connecting block 32 is used to replace the lifting ring in the prior art, so that the wire rope 21 is no longer directly connected to the steel box girder 4, so that the wire rope 21 can independently adjust its safety angle. When facing different steel box girders 4, it is possible to lift the heavier steel box girder 4 at a larger safety angle and lift the lighter steel box girder 4 at a smaller safety angle without replacing the wire rope 21. Therefore, there is no need to prepare multiple sets of wire ropes 21 of different lengths to cope with the lifting construction of different steel box girders 4, which solves the problem of complicated preparation steps for lifting different steel box girders 4 in the prior art.

[0022] Reference Figure 2 and Figure 3 In S1, brackets 33 are provided at the lower ends of the two lower connection blocks 32, and the shapes of the opposite surfaces between the two brackets 33 are respectively formed by imitating the outer contours of the two sides of the steel box beam 4; in S2, the two brackets 33 are used to hold up the steel box beam 4 during the lifting process. Compared with the method of burying a lifting ring on the top of the steel box beam 4 and then connecting it in the prior art, the present invention can better avoid the problem of stress concentration through a larger bearing area, and can lift the steel box beam 4 without damaging its structure, which has a better protection effect on the steel box beam 4.

[0023] Reference Figure 2 and Figure 3 In S1, an adjusting rod 34 is rotatably arranged in the cross beam 3, and the adjusting rod 34 rotates around a horizontal axis. The adjusting rod 34 is a double-headed screw having two sections of adjusting threads with opposite rotation directions. The adjusting rod 34 is threadedly connected to the two lower connecting blocks 32 through the two sections of adjusting threads; in S2, the spacing between the two lower connecting blocks 32 is adjusted by rotating the adjusting rod 34. By setting the above-mentioned adjusting rod 34, the two lower connecting blocks 32 can be relatively far away or relatively close at the same time, so as to achieve a quick adjustment effect, and the midpoint of the spacing between the two lower connecting blocks 32 can also be kept unchanged, so as to better keep the center of gravity of the cross beam 3 unchanged. Furthermore, one end of the adjusting rod 34 extends out of the end of the cross beam 3, and the end of the adjusting rod 34 can be connected to a hand wheel or a driving member to achieve manual adjustment or automatic adjustment.

[0024] Reference Figure 2 and Figure 3 In S1, two ring-shaped conveyor belts 35 are arranged in the crossbeam 3. The two conveyor belts 35 are respectively located between two groups of upper connecting blocks 31 and lower connecting blocks 32. The upper connecting blocks 31 are connected to the upper surface of the conveyor belt 35, and the lower connecting blocks 32 are connected to the lower surface of the conveyor belt 35. In S2, when adjusting the spacing, the two lower connecting blocks 32 drive the two upper connecting blocks 31 to adjust the spacing synchronously through the conveyor belt 35. Since the upper surface and the lower surface of the transmission belt move in opposite directions when the transmission belt is in the active state, based on the above arrangement, the movement directions of the upper connecting block 31 and the lower connecting block 32 are always opposite, and the upper connecting block 31 and the lower connecting block 32 are synchronously adjusted without separate adjustment, thereby achieving the effect of efficient operation. In the remaining embodiments, the ring-shaped conveyor belt 35 can be replaced by a ring-shaped conveyor chain, as long as the upper surface and the lower surface can move in opposite directions.

[0025] Reference Figure 2 and Figure 3 In S1, a locking rod 36 is connected between the upper connecting block 31 and the cross beam 3; before the operation of S2 is performed, the locking rod 36 between the upper connecting block 31 and the cross beam 3 is unlocked, and after the operation of S2 is performed, the locking rod 36 between the upper connecting block 31 and the cross beam 3 is locked. Specifically, the locking rod 36 is a threaded rod, and a locking hole penetrating the cross beam 3 is provided on the outer wall of the upper connecting block 31. The locking rod 36 is threadedly connected to the locking hole. When locking is required, the locking rod 36 is screwed inwardly so that the inner end of the locking rod 36 is pressed against the surface of the cross beam 3. When unlocking is required, the locking rod 36 is screwed outwardly so that the inner end of the locking rod 36 leaves the surface of the cross beam 3, thereby achieving the effect of fast locking and unlocking. It should be noted that, since the lower connecting block 32 has been locked by the adjusting rod 34, and the upper connecting block 31 and the lower connecting block 32 have been connected by the conveyor belt 35 or the conveyor chain, the upper connecting block 31 has been locked by the adjusting rod 34. The purpose of setting the locking rod 36 is to further improve the position stability between the upper connecting block 31 and the crossbeam 3 and avoid excessive burden on the conveyor belt 35.

[0026] Reference Figure 2 and Figure 3 The angle between the lower end of the steel wire rope 21 and the horizontal plane is the safety angle A. In S2, the safety angle A is greater than 45°, and the adjustment range of the safety angle A is 0-45°. The purpose of the above setting is to ensure that the safety angle of the steel wire rope 21 is always greater than 45°, thereby improving the safety of hoisting.

[0027] Reference Figures 2 to 4In S1, a horizontal suspension rod 1 is connected between the upper end of the steel wire rope 21 and the hook, and the top of the horizontal suspension rod 1 is connected to the hook and the bottom is connected to the upper end of the steel wire rope 21. Furthermore, in S1, an inclined suspension rod 22 is used to replace the steel wire rope 21, and the two ends of the inclined suspension rod 22 are respectively hinged to the horizontal suspension rod 1 and the upper connecting block 31. Since the connection using the inclined suspension rod 22 is a rigid connection and the connection using the steel wire rope 21 is a flexible connection, the inclined suspension rod 22 can have a higher lifting strength. In addition, in the present invention, when facing different steel box girders 4, the safety angle can be adjusted by adjusting the position of the lower end of the inclined suspension rod 22, and there is no need to prepare too many redundant inclined suspension rods 22. Therefore, even if the manufacturing cost of the inclined suspension rod 22 is better, it is easier to control the cost.

[0028] Reference Figure 4 In S1, the cross beam 3 is erected on the steel box beam 4 to be hoisted on the ground using the legs 5, and the bottoms of both ends of the cross beam 3 are provided with slots, and the cross beam 3 is connected to the legs 5 through the slots. By replacing the steel wire rope 21 with the inclined suspension rod 22 and supporting the cross beam 3 with the legs 5, a hanger is formed between the horizontal suspension beam, the inclined suspension beam, the cross beam 3 and the legs 5 in the preparation work for hoisting the steel box beam 4, and the hanger can be directly hoisted to the top of the steel box beam 4 to be hoisted, and then the bracket 33 is adjusted to clamp the steel box beam 4, and then the hoisting can be carried out. In this process, the hanger can be assembled off-site first, without the need for on-site assembly, avoiding the problem of hanger assembly difficulties caused by site restrictions or equipment restrictions at the construction site.

[0029] The above are all preferred embodiments of the present invention, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A steel box girder hoisting construction method, characterized in that: The following steps are involved: S1: A cross beam (3) is connected between the lower end of the steel wire rope (21) and the steel box beam (4), two upper connecting blocks (31) are slidably arranged on the top of the cross beam (3), and two lower connecting blocks (32) are slidably arranged on the bottom of the cross beam (3); S2: According to the width of the steel box girder (4), the spacing between the two lower connecting blocks (32) is adjusted, the spacing between the two lower connecting blocks (32) is proportional to the width of the steel box girder (4), and the cross beam (3) is connected to the steel box girder (4) via the two lower connecting blocks (32); according to the width of the steel box girder (4), the spacing between the two upper connecting blocks (31) is adjusted, the spacing between the two upper connecting blocks (31) is inversely proportional to the width of the steel box girder (4), and the cross beam (3) is connected to the lower end of the steel wire rope (21) via the two upper connecting blocks (31); S3: The hoisting equipment is connected to the upper end of the steel wire rope (21) via a hook, and then hoisting is performed.

2. A steel box girder hoisting construction method according to claim 1, characterized in that: In S1, brackets (33) are provided at the lower ends of the two lower connecting blocks (32), and the shapes of the opposing surfaces between the two brackets (33) are respectively formed according to the outer contours of the two sides of the steel box girder (4); in S2, the two brackets (33) are used to support the steel box girder (4) during the lifting process.

3. A steel box girder hoisting construction method according to claim 2, characterized in that: In S1, an adjusting rod (34) is rotatably arranged in the crossbeam (3), the adjusting rod (34) rotates around a horizontal axis, the adjusting rod (34) is a double-headed screw having two sections of adjusting threads with opposite rotation directions, and the adjusting rod (34) is threadedly connected to the two lower connecting blocks (32) through the two sections of adjusting threads; in S2, the spacing between the two lower connecting blocks (32) is adjusted by rotating the adjusting rod (34).

4. A steel box girder hoisting construction method according to claim 3, characterized in that: In S1, two annular conveyor belts (35) are arranged inside the crossbeam (3), and the two conveyor belts (35) are respectively located between two groups of the upper connecting blocks (31) and the lower connecting blocks (32), the upper connecting blocks (31) are connected to the upper surface of the conveyor belts (35), and the lower connecting blocks (32) are connected to the lower surface of the conveyor belts (35); in S2, when adjusting the spacing, the two lower connecting blocks (32) drive the two upper connecting blocks (31) to synchronously adjust the spacing through the conveyor belts (35).

5. The method for hoisting a steel box girder according to claim 1, characterized in that: In S1, a locking rod (36) is connected between the upper connecting block (31) and the cross beam (3); before the operation of S2 is performed, the locking rod (36) between the upper connecting block (31) and the cross beam (3) is unlocked; after the operation of S2 is performed, the locking rod (36) between the upper connecting block (31) and the cross beam (3) is locked.

6. A steel box girder hoisting construction method according to claim 1, characterized in that: The angle between the lower end of the steel wire rope (21) and the horizontal plane is taken as the safety angle A. In S2, the safety angle A is greater than 45°, and the adjustment range of the safety angle A is 0-45°.

7. A steel box girder hoisting construction method according to claim 4, characterized in that: In S1, a transverse suspension rod (1) is connected between the upper end of the steel wire rope (21) and the suspension hook, the top of the transverse suspension rod (1) is connected to the suspension hook and the bottom is connected to the upper end of the steel wire rope (21).

8. A steel box girder hoisting construction method according to claim 7, characterized in that: In S1, an inclined suspension rod (22) is used to replace the steel wire rope (21), and the two ends of the inclined suspension rod (22) are respectively hinged to the horizontal suspension rod (1) and the upper connecting block (31).

9. A steel box girder hoisting construction method according to claim 8, characterized in that: In S1, the cross beam (3) is erected on the steel box beam (4) to be hoisted on the ground using supporting legs (5).

10. A steel box girder hoisting construction method according to claim 9, characterized in that: In S1, the bottoms of both ends of the crossbeam (3) are provided with clamping grooves, and the crossbeam (3) is clamped onto the supporting legs (5) through the clamping grooves.

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