CN-117945270-B - Construction method for hoisting high-temperature ultrahigh-pressure boiler drum after being hung

Abstract

The invention discloses a construction method for hoisting a high-temperature and ultra-high-pressure boiler drum after being hung, wherein a crawler crane single machine is adopted to hoist the boiler drum at the outer side of the boiler, the temporary hanging beam is arranged close to the crawler crane, and the drum formal hanging beam is arranged far away from the crawler crane. After the steam drum is hung to the elevation in place, the tower crane installs the temporary hanging beam in place, 2 phi 47.5 steel wire ropes are adopted at the upper parts of the temporary hanging beam and the formal hanging beam, 2 phi 34 steel wire ropes are adopted at the contact part with the steam drum, and four heads of the steel wire ropes on the hanging beam and four heads of the steel wire ropes on the steam drum are connected in series to form one rope, so that the steel wire ropes are uniformly stressed. And installing a formal suspender beam after the hanging is finished, and finishing final positioning of the steam drum through the crawler crane and the chain block. The invention can carry out the installation work of the steam drum hoisting after the verticality of each layer of steel frame is checked and accepted without a slow platform and steel beams in the boiler furnace, and the checking and accepting modes of steps and sections enable engineering technicians to better and more conveniently control each quality element, thereby improving the construction process level.

Inventors

• Yue Zhitao
• XU ZHAOHUA
• LIN BINGQING

Assignees

• 山东电力建设第三工程有限公司

Dates

Publication Date

20260508

Application Date

20240118

Claims (2)

1. 1. The construction method for hoisting the high-temperature and ultra-high-pressure boiler drum after being hung is characterized by comprising the following steps of: step 1, selecting working conditions of the crawler crane, namely selecting the length and an included angle of a main arm of the crawler crane according to the height of a steel frame of a boiler, selecting the length of an auxiliary arm of the crawler crane according to the position of a steam drum, and determining an over-lifting counterweight of the crawler crane according to the weight of the steam drum; Step 2, combining a temporary hanging beam system on the ground, determining the length of the temporary hanging beam according to the distance between adjacent plate beams of the steam pocket, determining the specification of the temporary hanging beam according to the stress condition of the temporary hanging beam, and determining the height of a supporting beam according to the height of the adjacent beam of the steam pocket, and fixing two steel wire ropes at the temporary hanging position of the temporary hanging beam; step 3, unloading the drum to a preset position on the ground, fixing two steel wire ropes at the hanging position of the drum for doubling up, and erecting a platform channel on the top of the drum; Step4, operating the crawler crane, vertically hoisting the steam drum to a corresponding height, and slowly climbing the rod to a preset position for installing the steam drum; Step 5, hoisting the temporary hanging beam in the step 2, and welding the buttresses and the diagonal braces of the temporary hanging beam after the temporary hanging beam is hoisted to a preset position; Step 6, hanging the steam drum, namely connecting the steel wire rope on the hanging beam and the steel wire rope on the steam drum in series to form a rope so that the steel wire rope is uniformly stressed; step 7, adjusting the longitudinal and transverse center lines and elevation of the steam drum to be in place through the cooperation of the chain block and the crawler crane, and completing the formal positioning of the steam drum after the formal suspender beam is installed; drawing a position on the boiler plate girder in advance before the hanging girder is in place, wherein the position is prevented from being connected with a drum formal suspender Liang Xiangpeng; The position axis of the crawler crane station is not in the same straight line with the position of the steam drum, so that the steam drum is prevented from being contacted with the crane arm; the steam drum lifting positions are arranged along the front-rear direction of the boiler, so that the steam drum lifting path is shortened.
2. 2. The construction method for hoisting the high-temperature ultrahigh-pressure boiler drum after being hung is characterized in that two 6x 37-phi 47.5 steel wires are adopted at the position of the drum near the hanging beam, the length is 12.1m, two 6x 37-phi 47.5 steel wires are adopted at the upper part of a formal hanging beam, the length is 14.4m, two 6x 37-phi 34.5 steel wires are adopted at the contact part with the drum, the length is 13.5m, the two plug connectors of one steel wire rope near the hanging beam and the upper part of the formal hanging beam are connected with two folding parts of two steel wires at the bottom of the drum by two 25t snap rings, and the two plug connectors of the other steel wire rope near the upper part of the hanging beam are connected with four plug connectors of the steel wire rope at the bottom of the drum by two 25t snap rings.

Description

Construction method for hoisting high-temperature ultrahigh-pressure boiler drum after being hung Technical Field The invention relates to the technical field of boiler drum construction, in particular to a hoisting construction method after a high-temperature ultrahigh-pressure boiler drum is hung. Background The boiler steam drum is used as an important component part for connecting the whole boiler steam-water system, the construction progress and quality of the boiler steam drum can directly influence the successful development of important works such as subsequent heating surfaces and the like, and the boiler steam drum is one of key construction projects of boiler profession. The traditional steam drum construction scheme is that a steam drum is obliquely hoisted to a preset position of a steam drum installation elevation from the bottom of a furnace by a furnace top winch through a pulley block, and finally the steam drum is translated forwards to the installation position through the pulley block. The installation scheme has the advantages that the space of the lifting hole in the furnace is insufficient, the steam drum can not be lifted horizontally, the platform and the cross beam in the furnace can only be slowly loaded, the steam drum can be horizontally loaded to the position through the small tank after reaching the lifting height, the size of the steam drum is longer than that of a hearth, the inclined lifting inclination angle is larger, so that the stress of two windlass is uneven, and the installation process of the steam drum is difficult to meet more difficulties and risks due to the large size, high arrangement, more number of platforms and steel frames in the slow loading furnace and long construction period of the steam drum, and the strict requirements of projects on the construction period and quality are difficult to meet. Disclosure of Invention In order to overcome the problems in the prior art, the invention provides a hoisting construction method for a high-temperature and ultrahigh-pressure boiler drum after being hung. The technical scheme adopted by the invention for solving the technical problems is that the hoisting construction method for the steam pocket of the high-temperature and ultra-high-pressure boiler after being hung comprises the following steps: step 1, selecting working conditions of the crawler crane, namely selecting the length and an included angle of a main arm of the crawler crane according to the height of a steel frame of a boiler, selecting the length of an auxiliary arm of the crawler crane according to the position of a steam drum, and determining an over-lifting counterweight of the crawler crane according to the weight of the steam drum; Step 2, combining a temporary hanging beam system on the ground, determining the length of the temporary hanging beam according to the distance between adjacent plate beams of the steam pocket, determining the specification of the temporary hanging beam according to the stress condition of the temporary hanging beam, and determining the height of a supporting beam according to the height of the adjacent beam of the steam pocket, and fixing two steel wire ropes at the temporary hanging position of the temporary hanging beam; step 3, unloading the drum to a preset position on the ground, fixing two steel wire ropes at the hanging position of the drum for doubling up, and erecting a platform channel on the top of the drum; Step4, operating the crawler crane, vertically hoisting the steam drum to a corresponding height, and slowly climbing the rod to a preset position for installing the steam drum; Step 5, hoisting the temporary hanging beam in the step 2, and welding the buttresses and the diagonal braces of the temporary hanging beam after the temporary hanging beam is hoisted to a preset position; Step 6, hanging the steam drum, namely connecting the steel wire rope on the hanging beam and the steel wire rope on the steam drum in series to form a rope so that the steel wire rope is uniformly stressed; and 7, adjusting the longitudinal and transverse center lines and elevation of the steam drum to be in place through the cooperation of the chain block and the crawler crane, and installing a formal suspender beam to complete formal positioning of the steam drum. According to the hoisting construction method after the high-temperature ultrahigh-pressure boiler drum is hung, the reinforcing rib plates are arranged at the hanging positions of the steel wire ropes in the step2, and the cushion blocks are arranged at the upper parts of the hanging positions of the steel wire ropes, so that loads are uniformly distributed, and unhooking is facilitated. In the above construction method for hoisting the high-temperature and ultra-high-pressure boiler drum after hanging, in the step 3, in order to ensure a drum hoisting channel, the boiler is slowly provided with a right suspender beam of the drum furnace, and a main beam and