Hoisting method of curve inclined steel tower section in limited space

Abstract

The invention belongs to the field of constructional engineering, and particularly relates to a hoisting method of a curved inclined steel tower section in a limited space, which comprises the following steps: establishing a steel beam hoisting scheme, adding second lifting lugs at two ends of a first partition plate at the top of two side wall plates, fixedly arranging long circular rings at the second lifting lugs, and arranging first lifting lugs at the first partition plate of the two side wall plates; a steel wire rope penetrates into the two lifting lugs on one side, the steel wire rope is fixed through a long circular ring, and the stress direction during lifting is changed; the stress condition of a steel beam hoisting scheme during actual hoisting is simulated through finite element modeling dynamic analysis, the included angle between the bottom of the steel tower section and the horizontal plane is adjusted through simulation calculation, the included angle between the binding face and the horizontal plane after the steel tower section deflects is larger than the included angle when the steel tower section is installed in place, and the length of a steel wire rope and the arrangement position of a first lifting lug are determined. The direction of the lifting rope is changed through the multiple lifting lugs and the long lifting ring, then the stress direction is changed, and the limitation and potential safety hazards existing in the environment of a traditional lifting method are solved.

Description

Technical Field

[0001] The invention belongs to the field of construction engineering, and in particular relates to a method for hoisting a curved inclined steel tower segment in a limited space. Background Art

[0002] In modern architecture and engineering, curved inclined steel tower structures are widely used. However, during the construction process, how to hoist these steel tower segments safely and efficiently in a limited space is a technical problem. Conventional limited space inclined steel tower segment hoisting usually adopts two-point hoisting or four-point hoisting, and usually only two lifting ears are under force. The posture adjustment can only be achieved by adjusting the center of gravity by counterweights to achieve the purpose of posture adjustment. Conventional hoisting methods have the disadvantages of high requirements for lifting rigging, poor hoisting stability, and slow installation speed. They may not be effectively implemented in a small space, which may easily lead to increased construction difficulty and increased safety risks.

[0003] Therefore, how to provide a method for hoisting curved inclined steel tower segments in a limited space becomes a problem that needs to be solved by those skilled in the art. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention discloses a method for hoisting a curved inclined steel tower segment in a limited space. Through a unique arrangement of lifting lugs, a long lifting ring is used to change the direction of the lifting rope and thus change the direction of force, so as to solve the limitations and safety hazards of the traditional hoisting method in such an environment, and specifically discloses the following technical solutions:

[0005] A method for hoisting a curved inclined steel tower segment in a limited space comprises the following steps:

[0006] S01. Establish a steel beam lifting plan, arrange second lifting ears on both sides of the top of the inner arc wall plate of the steel tower segment, respectively, the second lifting ears are fixed with long circular rings, and the first lifting ears are arranged at the first partition of the wall plates on both sides;

[0007] S02. Use a steel wire rope to pass through the two lifting eyes on one side. When passing through, first fix one end of the steel wire rope on the second lifting eye, then put the long ring into the steel wire rope, and fix the other end of the steel wire rope on the first lifting eye. Finally, fix the steel wire rope through the long ring to change the force direction during lifting and use gravity for self-balancing.

[0008] S03. Through finite element modeling dynamic analysis, simulate the stress conditions of the steel beam lifting scheme during actual lifting. Through dynamic analysis, the steel tower segment will deflect under its own weight after lifting, and the steel tower segment will become inclined after the rotation is completed. Through simulation calculation, adjust the angle between the bottom of the steel tower segment and the horizontal plane, so that the angle between the bottom contact surface of the steel tower segment and the horizontal plane after the deflection is greater than the angle when it is installed in place, so as to determine the length of the wire rope and the layout position of the first lifting lug;

[0009] S04. According to the steel beam lifting plan, a first lifting lug, a second lifting lug, a long circular ring and a steel wire rope are arranged at corresponding positions of the steel tower segment;

[0010] S05. Use a crane to hoist and close the steel tower segments.

[0011] Furthermore, during hoisting, ensure that there is a sufficient safe distance between the steel tower segment and the concrete bridge deck.

[0012] Furthermore, a temporary jack is arranged inside the steel tower segment, and the temporary jack is arranged around the double-piece I-beam inside the steel tower segment.

[0013] Furthermore, when closing the mouth, first ensure that the lower mouth is aligned, then slowly swing the crane arm and adjust the temporary jack inside the segment to close the upper mouth, and finally temporarily fix it with a yard plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention changes the force transmission direction of the lifting rope by setting the first lifting lug and the fixing ring, so that the four lifting points of the steel tower segment are subjected to force, thereby reducing the safety risk of lifting;

[0016] 2. The single-side lifting eye of the present invention adopts one lifting rope, which can adaptively average the single-side force center of gravity to the two lifting eyes, thereby increasing the stability during lifting;

[0017] 3. The present invention uses finite element modeling and dynamic analysis to determine the position of the lifting lugs and the length of the lifting rope under the required steel tower segment posture. After lifting, the steel tower segment automatically forms an inclination posture, so that the steel tower segment angle is greater than the angle when installed in place, and the distance between the steel tower segment and the concrete during lifting is increased to ensure a sufficient safety distance. The increased angle will cause the lower mouth to contact and align first during installation. After the lower mouth is closed, the upper mouth is closed by swinging the crane arm, and the internal jack is used for coordination and adjustment to promote the rapid installation of the steel tower segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of the steel beam lifting solution of the present invention;

[0019] Figure 2 It is a schematic diagram of the interior of a steel tower segment of the present invention;

[0020] Figure 3 This is a schematic diagram of the temporary jack installation of the present invention;

[0021] Figure 4 It is a schematic diagram of the equilibrium state of the steel tower segment of the present invention;

[0022] Figure 5 It is a schematic diagram of the hoisting and closing of the steel tower segments of the present invention.

[0023] Among them, 1-the first lifting eye, 2-the second lifting eye, 3-the long ring, 4-the steel wire rope; 5-the crane; 6-the temporary jack; 7-the steel tower segment; 8-the concrete bridge deck. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] Reference Figure 1-5 This embodiment discloses a method for hoisting a curved inclined steel tower segment in a limited space, comprising the following steps:

[0027] S01. Establish a steel beam lifting scheme, arrange second lifting ears 2 on both sides of the top of the inner arc wall plate of the steel tower segment 7, the second lifting ears 2 are fixed with long circular rings 3, and the first lifting ears 1 are arranged at the first partition of the wall plates on both sides;

[0028] S02. Use a steel wire rope 4 to pass through the two lifting ears on one side. When passing through, first fix one end of the steel wire rope 4 on the second lifting ear 2, then insert the long ring 3 into the steel wire rope 4, and fix the other end of the steel wire rope 4 on the first lifting ear 1. Finally, fix the steel wire rope 4 through the long ring 3 to change the force direction during lifting and use gravity for self-balancing;

[0029] S03. Through finite element modeling dynamic analysis, simulate the stress conditions of the steel beam lifting scheme during actual lifting. Through dynamic analysis, the steel tower segment 7 will deflect under its own weight after lifting, and the steel tower segment 7 will become inclined after the rotation is completed. Through simulation calculation, adjust the angle between the bottom of the steel tower segment 7 and the horizontal plane, so that the angle between the bottom fitting surface of the steel tower segment 7 and the horizontal plane after the deflection is greater than the angle when it is installed in place, thereby determining the length of the steel wire rope 4 and the arrangement position of the first lifting lug 1, ensuring the smooth process of lifting the steel tower segment 7 in a limited space;

[0030] S04. According to the steel beam lifting scheme, a first lifting lug 1, a second lifting lug 2, a long ring 3 and a wire rope 4 are set at the corresponding position of the steel tower segment 7, and a temporary jack 6 is provided inside the steel tower segment 7. The temporary jack 6 is arranged around the double-piece I-beam inside the steel tower segment 7;

[0031] S05. The steel tower segment 7 is hoisted and closed by the crane 5. It should be noted that during hoisting, a sufficient safety distance should be ensured between the steel tower segment 7 and the concrete bridge deck 8. When closing, first ensure that the lower end is aligned, then the boom of the crane 5 is slowly swung and the temporary jack 6 inside the segment is adjusted to close the upper end, and finally, it is temporarily fixed by the stacking plate.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for hoisting a curved inclined steel tower segment in a limited space, characterized in that: The following steps are involved: S01. Establish a steel beam lifting plan, arrange second lifting ears on both sides of the top of the inner arc wall plate of the steel tower segment, respectively, the second lifting ears are fixed with long circular rings, and the first lifting ears are arranged at the first partition of the wall plates on both sides; S02. Use a steel wire rope to pass through the two lifting eyes on one side. When passing through, first fix one end of the steel wire rope on the second lifting eye, then put the long ring into the steel wire rope, and fix the other end of the steel wire rope on the first lifting eye. Finally, fix the steel wire rope through the long ring to change the force direction during lifting and use gravity for self-balancing. S03. Through finite element modeling dynamic analysis, simulate the stress conditions of the steel beam lifting scheme during actual lifting. Through dynamic analysis, the steel tower segment will deflect under its own weight after lifting, and the steel tower segment will become inclined after the rotation is completed. Through simulation calculation, adjust the angle between the bottom of the steel tower segment and the horizontal plane, so that the angle between the bottom contact surface of the steel tower segment and the horizontal plane after the deflection is greater than the angle when it is installed in place, so as to determine the length of the wire rope and the layout position of the first lifting lug; S04. According to the steel beam lifting plan, a first lifting lug, a second lifting lug, a long circular ring and a steel wire rope are arranged at corresponding positions of the steel tower segment; S05. Use a crane to hoist and close the steel tower segments.

2. The method for hoisting a curved inclined steel tower segment in a limited space according to claim 1 is characterized in that: During hoisting, ensure that there is sufficient safety distance between the steel tower segment and the concrete bridge deck.

3. The method for hoisting a curved inclined steel tower segment in a limited space according to claim 1, characterized in that: A temporary jack is arranged inside the steel tower segment, and the temporary jack is arranged around the double-piece I-beam inside the steel tower segment.

4. The method for hoisting a curved inclined steel tower segment in a limited space according to claim 3 is characterized in that: When closing, first ensure that the lower opening is aligned, then slowly swing the crane arm and use the temporary jack inside the segment to adjust until the upper opening is closed, and finally temporarily fix it with a code plate.

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