A steel box girder hoisting construction method

Abstract

The present application relates to hoisting construction technical field, more specifically, it relates to a kind of steel box girder hoisting construction method, comprising: S1: connecting a cross beam between the lower end of steel wire rope and steel box girder, two upper connecting blocks are arranged in the top sliding rod of cross beam, two lower connecting blocks are arranged in the bottom sliding of cross beam;S2: according to the width of steel box girder, the spacing of two lower connecting blocks is adjusted, the spacing of two lower connecting blocks is directly proportional to the width of steel box girder, and cross beam is connected with steel box girder by two lower connecting blocks;According to the width of steel box girder, the spacing of two upper connecting blocks is adjusted, and the spacing of two upper connecting blocks is inversely proportional to the width of steel box girder, and the lower end of steel wire rope is connected with cross beam by two upper connecting blocks;S3: hoisting equipment is connected with the upper end of steel wire rope by lifting hook, then hoisting is carried out, and the present application solves the problem that the preparation step is complicated when different steel box girders are hoisted in prior art.

Description

Technical Field

[0001] This invention relates to the field of hoisting construction technology, and in particular to a method for hoisting steel box girders. Background Technology

[0002] Steel box girders, also known as steel plate box girders, are a common structural form for long-span bridges, generally used on bridges with large spans. They are called steel box girders because their shape resembles a box. Steel box girders require hoisting equipment, hooks, wire ropes, and lifting rings for installation. Figure 1 As shown. The wire rope 21 has 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 increases. When lifting, the swing amplitude of the steel box girder 4 is larger, 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 decreases. When lifting, the wire rope 21 is less stressed, but the swing amplitude of the steel box girder 4 is smaller, which is suitable for lifting lighter steel box girders 4.

[0003] Generally, the wider the steel box girder, the greater its weight. In existing technology, hoisting equipment needs to use wire ropes of different lengths when lifting different steel box girders. Longer wire ropes are used when lifting heavier girders to increase the safety angle and ensure better stress distribution. Shorter wire ropes are used when lifting heavier girders to decrease the safety angle and prevent excessive swaying during lifting of lighter girders. However, this means that multiple sets of wire ropes of different lengths need to be prepared for different steel box girder hoisting operations, resulting in a cumbersome preparation process. Summary of the Invention

[0004] To address the cumbersome preparation steps required for hoisting different types of steel box girders in existing technologies, this application provides a method for hoisting steel box girders.

[0005] The present invention provides a steel box girder hoisting construction method, which adopts the following technical solution:

[0006] A method for hoisting and installing steel box girders includes the following steps:

[0007] S1: Connect a crossbeam between the lower end of the wire rope and the steel box girder, slide two upper connecting blocks on the top of the crossbeam, and slide two lower connecting blocks on the bottom of the crossbeam.

[0008] S2: Adjust the spacing between the two lower connecting blocks according to the width of the steel box girder. The spacing between the two lower connecting blocks is proportional to the width of the steel box girder. The crossbeam is connected to the steel box girder through the two lower connecting blocks. Adjust the spacing between the two upper connecting blocks according to the width of the steel box girder. The spacing between the two upper connecting blocks is inversely proportional to the width of the steel box girder. The crossbeam is connected to the lower end of the wire rope through the two upper connecting blocks.

[0009] S3: The hoisting equipment connects to the upper end of the wire rope via a hook, and then lifts the object.

[0010] Preferably, in S1, a bracket is provided at the lower end of each of the two lower connecting blocks, and the shape of the opposite surface between the two brackets is respectively formed to mimic the outer contour of the two sides of the steel box girder; in S2, the two brackets are used to support the steel box girder during the lifting process.

[0011] Preferably, in S1, an adjusting rod is rotatably installed inside the crossbeam. The adjusting rod rotates around a horizontal axis. The adjusting rod is a double-ended screw with two sections of adjusting threads in opposite directions. The adjusting rod is threadedly connected to the two lower connecting blocks through the two sections of adjusting threads respectively. In S2, the distance between the two lower connecting blocks is adjusted by rotating the adjusting rod.

[0012] Preferably, in S1, two annular conveyor belts are provided inside the crossbeam. The two conveyor belts are respectively located between the two sets of upper connecting blocks and 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 the two lower connecting blocks adjust their spacing, the two upper connecting blocks are driven to adjust their spacing synchronously through the conveyor belts.

[0013] Preferably, in S1, a locking rod is connected between the upper connecting block and the crossbeam; before performing the operation in S2, the locking rod between the upper connecting block and the crossbeam is unlocked, and after performing the operation in S2, the locking rod between the upper connecting block and the crossbeam is locked.

[0014] Preferably, the angle between the lower end of the 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°.

[0015] Preferably, in S1, a horizontal rod is connected between the upper end of the wire rope and the hook, with the top of the horizontal rod for connection to the hook and the bottom for connection to the upper end of the wire rope.

[0016] Preferably, in S1, a diagonal suspension rod is used instead of a steel wire rope, and the two ends of the diagonal suspension rod are respectively hinged to the horizontal suspension rod and the upper connecting block.

[0017] Preferably, in S1, the crossbeam is erected on the steel box girder to be hoisted using outriggers on the ground.

[0018] Preferably, in S1, the bottom of both ends of the crossbeam is provided with a slot, and the crossbeam is engaged with the support leg through the slot.

[0019] The beneficial effects of this invention are as follows:

[0020] When faced with different steel box girders, it is possible to lift heavier steel box girders at a larger safety angle and lighter steel box girders at a smaller safety angle without changing the wire rope. This eliminates the need to prepare multiple sets of wire ropes of different lengths to handle the lifting of different steel box girders, thus solving the problem of cumbersome preparation steps when lifting different steel box girders in the existing technology. Attached Figure Description

[0021] Figure 1 This is a simplified schematic diagram of the hoisting of steel box girders in the background art;

[0022] Figure 2 This is a simplified schematic diagram of the use of wire ropes to hoist different steel box girders in the embodiments of this application;

[0023] Figure 3 yes Figure 2 A perspective view of a partial structure;

[0024] Figure 4 This is a simplified schematic diagram of the use of inclined hangers to suspend different steel box girders in the embodiments of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Horizontal suspension rod; 21. Steel wire rope; 22. Diagonal suspension rod; 3. Crossbeam; 31. Upper connecting block; 32. Lower connecting block; 33. Bracket; 34. Adjusting rod; 35. Conveyor belt; 36. Locking rod; 4. Steel box girder; 5. Support leg. Detailed Implementation

[0026] The following will be combined with the appendix Figure 2 -Appendix Figure 4 The present invention will be further illustrated by the embodiments.

[0027] This embodiment discloses a method for hoisting and constructing steel box girders.

[0028] Reference Figure 2 and Figure 3 The steel box girder hoisting construction method includes the following steps:

[0029] S1: Connect a crossbeam 3 between the lower end of the wire rope 21 and the steel box girder 4. Slide two upper connecting blocks 31 on the top of the crossbeam 3 and slide two lower connecting blocks 32 on the bottom of the crossbeam 3.

[0030] S2: Adjust the spacing between the two lower connecting blocks 32 according to the width of the steel box girder 4. The spacing between the two lower connecting blocks 32 is proportional to the width of the steel box girder 4. The crossbeam 3 is connected to the steel box girder 4 through the two lower connecting blocks 32. Adjust the spacing between the two upper connecting blocks 31 according to the width of the steel box girder 4. The spacing between the two upper connecting blocks 31 is inversely proportional to the width of the steel box girder 4. The crossbeam 3 is connected to the lower end of the wire rope 21 through the two upper connecting blocks 31.

[0031] S3: The hoisting equipment connects to the upper end of the wire rope 21 via a hook, and then lifts the object.

[0032] In the above construction steps, by using the crossbeam 3 of the upper connecting block 31 and the lower connecting block 32 to replace the lifting ring in the prior art, the wire rope 21 is no longer directly connected to the steel box girder 4. This allows the wire rope 21 to independently adjust its safety angle. When facing different steel box girders 4, it is not necessary to replace the wire rope 21 to lift the heavier steel box girder 4 at a larger safety angle and the lighter steel box girder 4 at a smaller safety angle. Therefore, it is not necessary to prepare multiple sets of wire ropes 21 of different lengths to deal with the lifting construction of different steel box girders 4, thus solving the problem of cumbersome preparation steps when lifting different steel box girders 4 in the prior art.

[0033] Reference Figure 2 and Figure 3 In step S1, brackets 33 are provided at the lower ends of the two lower connecting blocks 32, and the shapes of the opposing surfaces of the two brackets 33 are respectively formed to mimic the outer contours of the two sides of the steel box girder 4; in step S2, the two brackets 33 are used to support the steel box girder 4 during lifting. Compared with the prior art method of connecting the steel box girder 4 by embedding lifting rings on the top, the present invention can better avoid the problem of stress concentration by using a larger bearing area, and can lift the steel box girder 4 without damaging its structure, thus providing better protection for the steel box girder 4.

[0034] Reference Figure 2 and Figure 3In step S1, an adjusting rod 34 is rotatably installed inside the crossbeam 3. The adjusting rod 34 rotates around a horizontal axis and is a double-ended screw with two sections of adjusting threads in opposite directions. The adjusting rod 34 is threadedly connected to two lower connecting blocks 32 through the two sections of adjusting threads. In step S2, the distance between the two lower connecting blocks 32 is adjusted by rotating the adjusting rod 34. By setting the adjusting rod 34, the two lower connecting blocks 32 can be simultaneously moved away from or move closer to each other, achieving a rapid adjustment effect. Furthermore, the midpoint of the distance between the two lower connecting blocks 32 remains unchanged, thus better maintaining the center of gravity of the crossbeam 3. Further, one end of the adjusting rod 34 extends beyond the end of the crossbeam 3. This end of the adjusting rod 34 can be connected to a handwheel or drive component to achieve manual or automatic adjustment.

[0035] Reference Figure 2 and Figure 3 In step S1, two annular conveyor belts 35 are installed inside the crossbeam 3. These two conveyor belts 35 are located between two sets of upper connecting blocks 31 and lower connecting blocks 32, respectively. The upper connecting blocks 31 connect to the upper surface of the conveyor belts 35, and the lower connecting blocks 32 connect to the lower surface of the conveyor belts 35. In step S2, when adjusting the spacing, the two lower connecting blocks 32 drive the two upper connecting blocks 31 to adjust the spacing synchronously via the conveyor belts 35. Since the upper and lower surfaces of the conveyor belt move in opposite directions when in motion, this arrangement ensures that the upper connecting blocks 31 and lower connecting blocks 32 always move in opposite directions, achieving synchronous adjustment of the upper and lower connecting blocks 31 and 32 without requiring separate adjustment, thus achieving efficient operation. In other embodiments, the annular conveyor belts 35 can be replaced by an annular conveyor chain, as long as the upper and lower surfaces can move in opposite directions.

[0036] Reference Figure 2 and Figure 3In step S1, a locking rod 36 connects the upper connecting block 31 and the crossbeam 3. Before performing step S2, the locking rod 36 between the upper connecting block 31 and the crossbeam 3 is unlocked. After performing step S2, the locking rod 36 between the upper connecting block 31 and the crossbeam 3 is locked. Specifically, the locking rod 36 is a threaded rod. The outer wall of the upper connecting block 31 has a locking hole that extends through to the crossbeam 3. The locking rod 36 is threadedly connected to the locking hole. When locking is required, the locking rod 36 is screwed inward so that the inner end of the locking rod 36 presses against the surface of the crossbeam 3. When unlocking is required, the locking rod 36 is screwed outward so that the inner end of the locking rod 36 leaves the surface of the crossbeam 3, achieving the effect of quick 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 positional stability between the upper connecting block 31 and the crossbeam 3, and to avoid excessive load on the conveyor belt 35.

[0037] Reference Figure 2 and Figure 3 The safety angle A is defined as the angle between the lower end of the wire rope 21 and the horizontal plane. 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 settings is to ensure that the safety angle of the wire rope 21 is always greater than 45°, thereby improving the safety of hoisting.

[0038] Reference Figures 2 to 4 In step S1, a horizontal lifting rod 1 is connected between the upper end of the wire rope 21 and the hook. The top of the horizontal lifting rod 1 is connected to the hook, and the bottom is connected to the upper end of the wire rope 21. Further, in step S1, a diagonal lifting rod 22 is used instead of the wire rope 21. The two ends of the diagonal lifting rod 22 are hinged to the horizontal lifting rod 1 and the upper connecting block 31, respectively. Since the connection using the diagonal lifting rod 22 is a rigid connection, while the connection using the wire rope 21 is a flexible connection, the diagonal lifting rod 22 can provide higher lifting strength. Furthermore, since the safety angle can be adjusted by adjusting the position of the lower end of the diagonal lifting rod 22 when dealing with different steel box girders 4, there is no need to prepare excessive amounts of diagonal lifting rods 22. Therefore, even though the manufacturing cost of the diagonal lifting rod 22 is higher, it is easier to control costs.

[0039] Reference Figure 4In step S1, the crossbeam 3 is erected on the steel box girder 4 to be hoisted using outriggers 5 on the ground. The bottom of both ends of the crossbeam 3 has slots, through which the crossbeam 3 is secured to the outriggers 5. By replacing the steel wire rope 21 with the inclined suspension rod 22 and supporting the crossbeam 3 using outriggers 5, a scaffold is formed between the crossbeam, inclined suspension beam, crossbeam 3, and outriggers 5 during the preparation for hoisting the steel box girder 4. The scaffold can be directly hoisted above the steel box girder 4, and then the bracket 33 is adjusted to clamp the steel box girder 4 before hoisting. During this process, the scaffold can be pre-assembled off-site, eliminating the need for on-site assembly and avoiding difficulties in scaffold assembly due to site or equipment limitations.

[0040] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for hoisting and constructing steel box girders, characterized in that, Includes the following steps: S1: Connect a crossbeam (3) between the lower end of the wire rope (21) and the steel box girder (4), slide two upper connecting blocks (31) on the top of the crossbeam (3), and slide two lower connecting blocks (32) on the bottom of the crossbeam (3). S2: Adjust the spacing between the two lower connecting blocks (32) according to the width of the steel box girder (4). The spacing between the two lower connecting blocks (32) is proportional to the width of the steel box girder (4). The crossbeam (3) is connected to the steel box girder (4) through the two lower connecting blocks (32). Adjust the spacing between the two upper connecting blocks (31) according to the width of the steel box girder (4). The spacing between the two upper connecting blocks (31) is inversely proportional to the width of the steel box girder (4). The crossbeam (3) is connected to the lower end of the wire rope (21) through the two upper connecting blocks (31). S3: The hoisting equipment connects to the upper end of the wire rope (21) via a hook, and then lifts the load; In S1, brackets (33) are provided at the lower ends of the two lower connecting blocks (32), and the shapes of the opposite surfaces of the two brackets (33) are respectively formed in imitation of the outer contours of the two sides of the steel box girder (4); in S2, the two brackets (33) are used to lift the steel box girder (4) during the lifting process. In S1, an adjusting rod (34) is rotatably installed inside the crossbeam (3). The adjusting rod (34) rotates around the horizontal axis. The adjusting rod (34) is a double-ended screw with two sections of adjusting threads in opposite directions. The adjusting rod (34) is threadedly connected to the two lower connecting blocks (32) through the two sections of adjusting threads respectively. In S2, the distance between the two lower connecting blocks (32) is adjusted by rotating the adjusting rod (34). In S1, two annular conveyor belts (35) are provided inside the crossbeam (3). The two conveyor belts (35) are respectively located between the two sets of upper connecting blocks (31) and 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 the two lower connecting blocks (32) adjust the spacing, they drive the two upper connecting blocks (31) to adjust the spacing synchronously through the conveyor belts (35).

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

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

4. The steel box girder hoisting construction method according to claim 3, characterized in that: In S1, a horizontal rod (1) is connected between the upper end of the wire rope (21) and the hook. The top of the horizontal rod (1) is connected to the hook, and the bottom is connected to the upper end of the wire rope (21).

5. The steel box girder hoisting construction method according to claim 4, characterized in that: In S1, a diagonal suspension rod (22) is used to replace the steel wire rope (21), and the two ends of the diagonal suspension rod (22) are respectively hinged to the horizontal suspension rod (1) and the upper connecting block (31).

6. The steel box girder hoisting construction method according to claim 5, characterized in that: In S1, the crossbeam (3) is erected on the steel box girder (4) to be hoisted using outriggers (5) on the ground.

7. The steel box girder hoisting construction method according to claim 6, characterized in that: In S1, the bottom of both ends of the crossbeam (3) is provided with a slot, and the crossbeam (3) is connected to the support leg (5) through the slot.

Images