CN-121992962-A - Layered hoisting dismantling method for reinforced concrete bracket

CN121992962ACN 121992962 ACN121992962 ACN 121992962ACN-121992962-A

Abstract

The invention relates to the technical field of building construction, in particular to a layered hoisting and dismantling method for a large reinforced concrete support in a chemical device. According to the method, a technical system of spatial positioning, controllable fracture and integral hoisting is constructed through the synergistic effect of multi-hanging point bundling of a beam penetrating through a floor slab and temporary stabilization of a hoop tool.

Inventors

ZHAO QINGDONG
BAI PENG
Leng Guangyong
LI TAO
GAO HONGTAO
Jin Zhongrang
LONG HU
LI YU
SUN LINGANG
SUN ZHIBIN
Cun Daijiang
ZHANG CHUNZHI
ZHENG LIANHONG

Assignees

云南建投安装股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260330

Claims (2)

1. The layered hoisting and dismantling method of the large reinforced concrete support is applied to a concrete chimney or an exhaust pipe support and is characterized by comprising the following steps of: S1, dividing and demarcating a frame structure into a plurality of hoisting units along the height direction, determining a critical layer M for integral hoisting, dismantling and field crushing and dismantling according to the matching relation between the rated load of hoisting equipment and the weight of the layer structure to be dismantled and the space constraint of adjacent facilities, wherein the Mth layer and above are integrally hoisted by a whole layer, and the Mth layer and below are broken by a breaking hammer; S2, bundling a layer of concrete floor slab to be dismantled through a beam with multiple hanging points, namely arranging rectangular holes on the layer of concrete floor slab to be dismantled, wherein the rectangular holes are positioned on one side of four corner posts facing the geometric center of the frame and on one side of four side posts perpendicular to the side walls facing the inside of the frame, the distance between the center line of the holes and the edge of the section of the posts is 600mm-800mm; S3, carrying out horizontal circular cutting on the four corner posts by adopting a rope saw, wherein the cutting is carried out in a diagonal cutting sequence, suspending when each corner post is horizontally cut to a depth of 70%, then installing a hoop tool on the corner post below a cutting joint, carrying out horizontal circular cutting on the four corner posts by adopting the rope saw, cutting in a contralateral cutting sequence, directly carrying out 100% horizontal cutting, and finally carrying out 100% horizontal cutting on the four corner posts by using the rope saw, wherein the hoop tool and the tension force of a steel wire rope jointly maintain the stability of a hoisting unit so as to prevent sudden fracture caused by stress release; S4, integrally hoisting and circulating, namely, after the uniform stress of the 8 hoisting points is confirmed, integrally hoisting the hoisting unit to a ground crushing area by adopting an all-ground automobile crane, and repeating the steps S2-S4 in sequence from top to bottom until all the layers above the Mth layer are removed.
2. The layered hoisting dismantling method for the large reinforced concrete support frame disclosed by claim 1 is characterized in that the anchor ear tool comprises a hard aluminum plastic sheet (1), angle steels (2), channel steels (3) and stud bolts (4), wherein the hard aluminum plastic sheet is rectangular, two side cutting slits are respectively plugged in, the outer side edges of the hard aluminum plastic sheet are flush with the edges of the corner posts, the angle steels are respectively fixed at the four corners of the corner posts, the corner posts and the edges of the hard aluminum plastic sheet are wrapped at the same time, the channel steels are arranged outside the corner posts to opposite sides, corresponding through holes are arranged on the channel steel wing plates, and the stud bolts are arranged on the other opposite sides and penetrate through the through holes on the channel steels and are fixed by nuts. Specifically, the hoisting unit determines to follow the following rules: the weight rule is that the calculated weight of the whole layer of hoisting units does not exceed 85% of rated hoisting weight of hoisting equipment under the working condition corresponding to the elevation of the layer; geometric rules, namely, the minimum safe distance between the top elevation of the hoisting unit and the vertical line of the lifting hook of the hoisting equipment is larger than the height of the top point of the adjacent barrier; and (3) the structural rule is that when the section size of the concrete column of the layer to be dismantled is larger than that of the adjacent lower layer column, the layer is regarded as a structural abrupt change layer, and the layer column and the lower layer column can be cut in a segmented mode or lifted independently. Specifically, the critical layer M follows the rule that the critical layer M for integral hoisting and crushing dismantling is determined by comparing the size relation between G and Q multiplied by eta (eta is a safety coefficient and eta is more than or equal to 0.8 and less than or equal to 0.9) and the size relation between (H layer top +S) and Hobs based on the rated load Q of hoisting equipment, the weight G of a layer structure to be dismantled, the height Hobs of an adjacent barrier and the hoisting safety distance S.

Description

Layered hoisting dismantling method for reinforced concrete bracket Technical Field The invention relates to the technical field of building construction, in particular to a layered hoisting and dismantling method for a large reinforced concrete bracket in a chemical device. Background With the advancement of urban updating and capacity replacement of chemical enterprises, a large number of high-rise reinforced concrete structures (such as exhaust pipe supports of converters of sulfuric acid plants, cooling tower frames of power plants and the like) face dismantling requirements. Such structures are typically characterized by large heights, large aspect ratios, large numbers of floors, and proximity to production facilities, with significant limitations associated with conventional demolition methods. In the prior art, a rope saw cutting and automobile crane hoisting combined dismantling method is adopted for dismantling high-rise buildings in urban centers, such as the description of a green dismantling method for high-rise buildings in urban centers (university of great Ann, volume 46 of 2024), wherein hoisting holes are reserved or opened on concrete floors, and the method is used for realizing block hoisting through rope threading, however, the method still depends on a traditional single-point or double-point hooking mode during hoisting, and the problem of controlling the gravity center of a whole layer of beam slab column serving as a rigid hoisting unit is not solved. When the method is applied to a high-rise frame structure, as the whole layer of beam slab column of the high-rise reinforced concrete structure has the characteristics of large height-width ratio, sensitive wind load and extremely easy generation of unbalanced load swing, the frame can topple or collide with adjacent equipment in the hoisting process, and therefore, a dismantling method capable of realizing the whole layer hoisting of the high-rise reinforced concrete frame under the conditions of limited external sites and adjacent sensitive equipment and having accurate and controllable gravity center is needed. Disclosure of Invention The invention aims to overcome the defects that the gravity center is difficult to control and unbalanced load swing is easy to generate during the whole-layer lifting of a high-rise frame in the prior art, and provides a layered lifting and dismantling method for a large reinforced concrete bracket, so that the gravity center of a whole-layer beam slab column is automatically overlapped with a vertical line of a lifting hook, and zero influence of adjacent sensitive equipment is ensured. In order to solve the technical problems, the invention adopts the following technical scheme: the layered hoisting and dismantling method of the large reinforced concrete support is applied to a concrete chimney or an exhaust pipe support and is characterized by comprising the following steps of: S1, dividing and demarcating a frame structure into a plurality of hoisting units along the height direction, determining a critical layer M for integral hoisting, dismantling and field crushing and dismantling according to the matching relation between the rated load of hoisting equipment and the weight of the layer structure to be dismantled and the space constraint of adjacent facilities, wherein the Mth layer and above are integrally hoisted by a whole layer, and the Mth layer and below are broken by a breaking hammer; S2, bundling a layer of concrete floor slab to be dismantled through a beam with multiple hanging points, namely arranging rectangular holes on the layer of concrete floor slab to be dismantled, wherein the rectangular holes are positioned on one side of four corner posts facing the geometric center of the frame and on one side of four side posts perpendicular to the side walls facing the inside of the frame, the distance between the center line of the holes and the edge of the section of the posts is 600mm-800mm; S3, carrying out horizontal circular cutting on the four corner posts by adopting a rope saw, wherein the cutting is carried out in a diagonal cutting sequence, suspending when each corner post is horizontally cut to a depth of 70%, then installing a hoop tool on the corner post below a cutting joint, carrying out horizontal circular cutting on the four corner posts by adopting the rope saw, cutting in a contralateral cutting sequence, directly carrying out 100% horizontal cutting, and finally carrying out 100% horizontal cutting on the four corner posts by using the rope saw, wherein the hoop tool and the tension force of a steel wire rope jointly maintain the stability of a hoisting unit so as to prevent sudden fracture caused by stress release; S4, integrally hoisting and circulating, namely, after the uniform stress of the 8 hoisting points is confirmed, integrally hoisting the hoisting unit to a ground crushing area by adopting an all-ground automobile crane, and repeating the steps S2-S4 i