Construction adjustment method for gantry girder when too long

Abstract

The application provides a construction adjustment method for a portal girder when the girder is too long. By adjusting the position of the web plate-to-rib of the girder bell mouth and the rigid leg, the girder can still maintain the perpendicularity of the leg without adjusting the span of the trolley through the dislocation of the web plate-to-rib. The small dislocation can also meet the requirements of the web plate-to-rib of the leg, the correction amount is small, the size of the girder does not need to be modified again, the construction requirements are met while the investment cost is saved, and the overall structure of the portal is stable.

Description

Technical Field

[0001] This invention relates to a construction adjustment method for a gantry beam that is too long, belonging to the field of port equipment technology. Background Technology

[0002] Gantry cranes are a new type of small lifting equipment developed to meet the company's daily production needs for moving equipment, loading and unloading goods in and out of warehouses, lifting and repairing heavy equipment, and transporting materials. They are suitable for various occasions that require lifting large objects, such as equipment manufacturing, construction, and port transportation. They can reduce manpower, lower production and operating costs, and improve work efficiency.

[0003] During the fabrication of the gantry crane beam in the workshop, a certain length deviation is allowed. When the length is made too long, the opening dimension from the flexible hinge point to the rigid flared end exceeds the allowable deviation. In current general construction projects (such as GB14406 general gantry cranes), when the opening at the top of the beam is made too long, it is generally corrected by adjusting the verticality of the outriggers, with an allowable verticality deviation of H / 1000. If this is insufficient, it can be corrected by reducing the span of the trolley. When moving the crane to the user's storage yard, the adjusting bolts on the trolley are adjusted to meet the usage requirements.

[0004] However, in actual construction, under certain extreme conditions, to ensure the overall structural stability of the gantry crane, situations arise where the outriggers must be vertical and cannot be aligned using other methods. Simultaneously, to reduce on-site adjustments to match the track gauge and prevent the trolley from biting the rails, alignment using the trolley span is not feasible. Due to the massive size and structure of the main beam, disassembling and re-welding is clearly impractical. With the lower track gauge and outrigger verticality already determined, and the flexible legs connected to the main beam hinge, the main beam's flared end and the outrigger frame cannot be aligned. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned problems existing in the construction and assembly process of existing gantry frames, and to propose a construction adjustment method when the main beam of the gantry frame is too long.

[0006] The technical solution of this invention: a construction adjustment method for an excessively long gantry beam, specifically including the following steps:

[0007] (1) Insert the pin into the flexible leg side, weld the anti-shear block, and tighten the rigid leg and flexible leg sides with the support hoist;

[0008] (2) Measure the verticality of the rigid legs and flexible legs on both sides of the main beam, and adjust the verticality of the flexible legs to be in place;

[0009] (3) Based on the impact points of the rigid legs and flexible legs on both sides of the main beam, measure the actual span at the bottom of the main beam and calculate the actual adjustment value to be made on the rigid leg side;

[0010] (4) Use a 120T gantry crane to lift the top of the main beam on the side of the rigid leg, remove the spot weld at the support flange of the rigid leg by carbon gouging, and lift the hook to separate the main beam from the support flange.

[0011] (5) Use the outrigger hoist to adjust the verticality of the rigid leg;

[0012] (6) Remove the carbon gouging from the vertical weld of the main beam flared mouth, adjust the position of the reinforcement of the main beam flared mouth and the support web of the rigid leg, and complete the flared mouth positioning weld at the misaligned reinforcement.

[0013] (7) Reposition the clips on the web of the rigid leg, lower the hook and place the beam in place, and re-measure all dimensions to ensure they are within acceptable limits;

[0014] (8) Complete the welding of the large joint between the main beam flare and the support flange.

[0015] Furthermore, the gantry frame as a whole includes a main beam, rigid legs, and flexible legs, wherein the rigid legs are vertically installed on the sea side, the flexible legs are vertically installed on the land side, and the main beam is installed on top of the rigid legs and the flexible legs.

[0016] Furthermore, in step (4), the separation height between the main beam and the support flange is 30mm.

[0017] Furthermore, in step (6), the misalignment width of the reinforcing bar position shall not exceed 1 / 2 the thickness of the web plate of the support leg.

[0018] Compared with the prior art, the advantages of the present invention are as follows: by adjusting the position of the reinforcement of the main beam flared mouth and the web plate of the rigid leg, the main beam can still maintain the verticality of the leg without adjusting the trolley span by using the reinforcement misalignment. At the same time, even a slight misalignment can meet the reinforcement requirements of the leg. The amount of rectification is small, and there is no need to modify the main beam size. While meeting the construction requirements, it saves investment costs and ensures the overall structural stability of the gantry. Attached Figure Description

[0019] Appendix Figure 1 This is a structural front view of the construction process of the construction adjustment method for the gantry beam of the present invention when it is too long.

[0020] Appendix Figure 2 This is a structural side view of the construction process of the construction adjustment method for the gantry beam of the present invention when it is too long. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] like Figures 1-2 As shown, the gantry crane as a whole consists of a main beam, rigid legs, and flexible legs. The rigid legs are vertically positioned on the sea side, and the flexible legs are vertically positioned on the land side. The main beam is installed on top of the rigid and flexible legs. Because the main beam is longer than expected during manufacturing in the workshop, it will be aligned and aligned after assembly. To ensure that the trolley span between the rigid and flexible legs meets the drawing requirements, the following adjustment and alignment method is required before welding the final assembly joint.

[0023] (1) Insert the pin into the flexible leg side, weld the anti-shear block, and tighten the rigid leg and flexible leg sides with the support hoist;

[0024] (2) Measure the verticality of the rigid legs and flexible legs on both sides of the main beam. If the verticality of the flexible legs exceeds the tolerance, it should be adjusted to the correct position first.

[0025] (3) Based on the impact points of the rigid legs and flexible legs on both sides of the main beam, measure the actual span at the bottom of the main beam and calculate the actual adjustment value to be made on the rigid leg side;

[0026] (4) Use a 120T gantry crane to lift the top of the main beam on the side of the rigid leg, remove the spot weld at the support flange of the rigid leg by carbon gouging, lift the hook, and separate the main beam from the support flange by about 30mm.

[0027] (5) Use the outrigger hoist to adjust the verticality of the rigid leg;

[0028] (6) Remove the vertical weld seam of the main beam flared mouth with carbon gouging, adjust the position of the reinforcement of the main beam flared mouth and the support web of the rigid leg, and the misalignment of the reinforcement shall not exceed 1 / 2 of the thickness of the support web, which is 8mm in this embodiment, and complete the flared mouth positioning weld.

[0029] (7) Reposition the clips on the web of the rigid leg, lower the hook and place the beam in place, and re-measure all dimensions to ensure they are within acceptable limits;

[0030] (8) Complete the welding of the large joint between the main beam flare and the support flange.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A construction adjustment method for an excessively long gantry beam, characterized in that: The method specifically comprises the following steps: (1) the flexible leg side is worn with a pin shaft, a shear block is welded, and the rigid leg and the flexible leg are pulled tight by a support leg hoist; (2) the perpendicularity of the rigid leg and the flexible leg on both sides of the girder is measured, and the perpendicularity of the flexible leg is adjusted to be in place; (3) according to the side impact points of the rigid leg and the flexible leg on both sides of the girder, the actual span of the lower opening of the girder is measured, and the actual adjustment value of the rigid leg side is calculated; (4) the top end of the girder on the rigid leg side is hung by a 120T door machine, the point weld seam at the support flange of the girder and the rigid leg is removed by carbon planing, the lifting hook is lifted, and the girder is separated from the support flange; (5) the perpendicularity of the rigid leg is adjusted by the support leg hoist; (6) the vertical weld of the girder horn mouth is removed by carbon planing, the position of the butt strap of the girder horn mouth and the support web of the rigid leg is adjusted, and the positioning welding of the horn mouth is completed at the misaligned butt strap; (7) the repositioning clamp code on the support web of the rigid leg is placed, the girder is placed in place by lowering the hook, and each size is re-measured to be qualified; (8) the large joint welding of the girder horn mouth and the support flange is completed.

2. The construction adjustment method for a portal girder when the portal girder is too long according to claim 1, characterized in that: The gantry whole body comprises a girder, a rigid leg and a flexible leg, wherein the rigid leg is vertically arranged on the sea side, the flexible leg is vertically arranged on the land side, and the girder is installed on the top of the rigid leg and the flexible leg.

3. The construction adjustment method of a portal girder when it is too long according to claim 1, characterized in that: In the step (4), the separation height of the girder and the support flange is 30mm.

4. The construction adjustment method for a portal girder when the portal girder is too long according to claim 1, characterized in that: In the step (6), the misalignment width of the butt strap position should not be more than 1 / 2 of the thickness of the support web.

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