CN101941028B - Method for correcting spatially-downwarped steel beam - Google Patents

Abstract

The invention relates to a method for correcting a steel beam deflected in space, which is characterized in that: a correcting device is made, which includes a box-shaped beam, and a pair of hanging arm groups with rectangular holes on the upper part are respectively arranged at both ends of the box-shaped beam, Hang the box girder directly below the steel girder to be corrected, hang the box girder under the steel girder to be corrected, place a hydraulic jack on the box girder, use an electric hydraulic oil pump to supply oil to the hydraulic jack, and the hydraulic jack Stretch upward, press the downward deflection of the steel beam, so that the steel beam is subjected to upward pressure, after pressing, measuring, pressing again, measuring again, repeated testing and testing, until the deflection value of the steel beam meets the correction requirements . Its advantages are: use the steel beam itself as a support, hang the box girder on it, press down the deflection with a hydraulic jack to achieve the purpose of correction, and avoid the problems of high cost and long construction period caused by replacing the steel beam.

Description

Correction method of deflected steel beam in space

technical field

The invention relates to a method for correcting steel beams deflected under space, which is used for in-situ correction of steel beams at the bottom of a group of steel beams that are seriously deflected in the overhaul project of large furnaces such as gas vertical furnaces, but is not easy to be disassembled and replaced, and belongs to steel deflected under space Beam orthotics technology field.

Background technique

In the traditional overhaul project, some parts with serious deformation are replaced. However, in some cases, corrective measures must be taken due to the constraints of the construction period and cost of the project.

The gas vertical furnace is an industrial furnace specially used to dry coal to obtain gas. Its main product is gas, and its by-products mainly include coke and by-products generated during gas purification. Its main structure is a furnace body made of refractory bricks. On the steel structure furnace bottom with a height of about 8 meters, the furnace protection structure is composed of furnace columns, beams, and furnace top bracing. Coal charging, gas absorption and other supporting equipment are installed on the top of the furnace; equipment for falling coke is installed under the bottom of the furnace. The basic production process is as follows: coal is charged from the top of the furnace, the coal is dry-distilled at high temperature in the furnace body to produce gas, the gas is absorbed from the top of the furnace and sent to the chemical production process, and coke is leaked from the bottom of the furnace. After several years of production of the furnace body, most of the masonry and various equipment have been damaged to varying degrees and need to be overhauled. During the overhaul, the masonry must be completely removed and new bricks laid, and various equipment must also be dismantled. Depending on the technical condition, it is decided to replace or repair. During the overhaul, the steel structure of the furnace body is often still usable. Due to the weight of the furnace body and related equipment on the furnace bottom steel beam, the coke discharge equipment is hung below, and the load is heavy. The steel beams on the furnace bottom are seriously out of tolerance. The downward deflection ranges from 20-50mm. If the method of replacement is adopted, not only the material of the furnace bottom steel beam is wasted, but also the steel structure of the furnace protection and related equipment must be dismantled and installed. In this way, the amount of work, the construction period and the cost will be increased. If it can be corrected to achieve an upward deflection of 1-5mm, the disadvantages caused by replacement can be avoided, and the overhaul cost and construction period can be greatly saved. However, there is currently no special or general equipment for in-situ correction of the deflection deformation of the furnace bottom steel beam on the market, nor is there any method for in-situ correction of the downward deflection deformation of the furnace bottom steel beam.

Contents of the invention

The object of the present invention is to provide a method for correcting the space deflection steel beams for the serious deflection of the steel beams at the bottom of the furnace in the overhaul project of large furnaces such as gas vertical furnaces and the method of replacement.

The method for correcting steel beams under space deflection of the present invention is as follows: make a correcting device, including a box-shaped girder, a pair of hanging arm groups with rectangular holes in the upper part are respectively arranged at both ends of the box-shaped girder, and the box is lifted by a hoisting tool. Hang the shaped girder directly below the steel girder to be corrected, lift the box girder upwards so that the hanging arm groups on the box girder are inserted on both sides of the steel girder to be corrected, and clamp the steel girder between the two hanging arm groups of each set. Between the two hanging arms, insert the hanging pins in the rectangular holes of the two hanging arms of each group of hanging arms respectively, hang the box girder under the steel beam to be corrected, place a hydraulic jack on the box girder, and use The electric hydraulic oil pump supplies oil to the hydraulic jack, and the hydraulic jack stretches upwards to press against the downward deflection of the steel beam, so that the steel beam is subjected to upward pressure. After pressing, measuring, pressing again, and measuring again, repeated testing , until the deflection value on the steel beam meets the correction requirements.

The advantages of the present invention are: use the steel beam itself as a support, hang the box girder on it, press down the deflection with a hydraulic jack to achieve the purpose of correction, and avoid the high cost and long construction period caused by the replacement of the steel beam. question.

Description of drawings

Fig. 1 is a structural schematic diagram of a deflected steel beam correction device in space;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the schematic diagram of the correction method of the deflected steel beam under the space;

Fig. 4 is a view from A--A direction of Fig. 3 .

Detailed ways

Example: Correction of deflection of grouped steel beams at the bottom of a gas vertical furnace.

1mm钢线，其下表面较钢梁两端的上表面高50mm，用钢尺在钢梁的任一点可测量到该点与钢线下表面的距离，若大于50mm，表示下挠，小于50mm，表示上挠，顶压时将千斤顶5置于下挠度最大的点，(大多数在梁的中点)这样在顶压时可随时测量到上挠的程度，便可发令停压。直至达到有一定上挠度值(1-5mm)的要求为止。当矫正完一根钢梁后，用吊装工具将空间下挠钢梁矫正装置吊挂于另一根需的钢梁上，同时移动工作平台8，重复矫正动作。依次从成组钢梁的一端逐根矫正至另一端。将全部钢梁矫正完毕，直至所有钢梁上挠度值达到矫正要求为止。With reference to the accompanying drawings, the basic shape of the steel beam 9 to be corrected is I-shaped, with a total height of 600mm, a width of 200mm on the upper and lower flanges, a thickness of 30mm, and a thickness of 20mm on the web; to realize the correction device for the downward deflection of the steel beam in the manufacturing space, the correction device Comprising a box beam 1, the box beam 1 is all made of 20mm steel plates, and a pair of hanging arm groups 2 with rectangular holes 3 are respectively welded at the two ends of the box beam 1. The correction method is: hang the box girder 1 directly below the steel girder 9 to be corrected with a hoisting tool, lift the box girder 1 upwards, and insert the hanging arm group 2 on the box girder 1 into the steel girder 9 to be corrected. On both sides, clamp the steel beam 9 between the two hanging arms of each group of hanging arms, insert the hanging pins 4 into the rectangular holes 3 of the two hanging arms of each group of hanging arms, and suspend the box beam 1 Below the steel beam 9 to be corrected, a hydraulic jack 5 is placed on the box girder 1, and a movable working platform 8 is set on the ground below the box girder 1, on which people and necessary tools can be placed. The electric hydraulic oil pump 7 is used to supply oil to the hydraulic jack 5, the electric hydraulic oil pump 7 is placed on the movable work platform 8, the hydraulic jack 5 is connected through the high pressure oil pipe 6, and the electric hydraulic oil pump 7 is connected to a 380v power supply. When the hydraulic pump 7 is started to supply oil, the piston rod of the jack 5 is ejected upwards, and presses the downward deflection of the steel beam, so that the steel beam is subjected to upward pressure. After pressing, measuring, pressing again, and measuring again, try repeatedly test. Before the top pressure, install the straightened steel beam for measurement on the steel beam 9.

1mm steel wire, the lower surface of which is 50mm higher than the upper surface of both ends of the steel beam. Use a steel ruler to measure the distance between this point and the lower surface of the steel wire at any point of the steel beam. If it is greater than 50mm, it means downward deflection. If it is less than 50mm, Represent upward deflection, and jack 5 is placed on the point of maximum deflection during jacking, (mostly at the midpoint of the beam) so that the degree of upward deflection can be measured at any time when jacking up, and the pressure can be stopped. Until the requirement of a certain upper deflection value (1-5mm) is reached. After correcting a steel beam, use the hoisting tool to hang the steel beam correction device under the space on another required steel beam, and move the working platform 8 at the same time to repeat the correcting action. Correct one by one from one end of the group of steel beams to the other end. Complete the correction of all steel beams until the deflection values on all steel beams meet the correction requirements.

Claims (1)

1. A correction method for deflected steel beams in a space is characterized in that: make a correction device, including a box beam, and a pair of hanging arm groups with rectangular holes are respectively arranged on the two ends of the box beam, The hoisting tool hangs the box girder directly below the steel girder to be corrected, lifts the box girder upwards, inserts the hanging arm groups on the box girder on both sides of the steel girder to be corrected, and clamps the steel girder on each set of hanging arms. Between the two hanging arms of the arm group, insert the hanging pins into the rectangular holes of the two hanging arms of each arm group, hang the box girder under the steel beam to be corrected, and place it on the box girder The hydraulic jack uses an electric hydraulic oil pump to supply oil to the hydraulic jack. The hydraulic jack extends upwards and presses the downward deflection of the steel beam, so that the steel beam is subjected to upward pressure. After pressing, measuring, pressing again, and measuring again, repeat Test the top until the deflection value on the steel beam meets the correction requirements.

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