CN115523814B - In-situ collapse blasting demolition method for reinforced concrete cooling tower - Google Patents
In-situ collapse blasting demolition method for reinforced concrete cooling tower Download PDFInfo
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- CN115523814B CN115523814B CN202211234933.8A CN202211234933A CN115523814B CN 115523814 B CN115523814 B CN 115523814B CN 202211234933 A CN202211234933 A CN 202211234933A CN 115523814 B CN115523814 B CN 115523814B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/02—Particular applications of blasting techniques for demolition of tall structures, e.g. chimney stacks
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/08—Wrecking of buildings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D5/00—Safety arrangements
- F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
- F42D5/045—Detonation-wave absorbing or damping means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a method for in-situ collapse blasting demolition of a reinforced concrete cooling tower, which comprises the following steps: step one, preprocessing, namely arranging a load reduction groove and an auxiliary load reduction groove on the wall of the cooling tower; drilling blast holes on all the herringbone upright posts at the lower part of the ring beam of the cooling tower, and forming an annular blasting notch under the ring beam after blasting; dividing two explosion areas in the annular explosion incision, and detonating detonators with two different specifications, namely 50ms in-hole delay and 500ms in-hole delay; step four, carrying out protective measures on the blasting positions of the herringbone upright posts, wrapping the herringbone upright posts, and carrying out hanging protection on the annular blasting incisions; and fifthly, blasting the cooling tower. The invention can realize in-situ collapse and disassembly under the action of the gravity of the cooling tower, the detonation pile is more concentrated, the damage to surrounding buildings is reduced, and the invention is applicable to various working environments, in particular to blasting operation with extremely complex surrounding environment and limited tilting range.
Description
Technical Field
The invention relates to the technical field of engineering blasting, in particular to a method for in-situ collapse blasting demolition of a reinforced concrete cooling tower.
Background
At present, a directional collapse blasting demolition method is generally adopted for blasting demolition of the reinforced concrete cooling tower in China. The method comprises the steps of blasting a blasting notch at the bottom of the toppling side of the cooling tower, and carrying out explosive explosion on the herringbone column and the ring beam in the blasting notch to destroy the stability of the structure, so that the whole structure is unstable and the gravity center is displaced, and the cooling tower can be collapsed in a preset direction.
The directional collapse blasting demolition method has high requirement on collapse space, and is only suitable for being implemented in an environment with enough collapse sites. With the development of cities, buildings are more and more dense, the geographical environment in which a cooling tower is located becomes more complex, the collapse range is greatly limited, and therefore, higher requirements are placed on the blasting technology.
Therefore, a method for in-situ collapse blasting demolition of the reinforced concrete cooling tower is provided.
Disclosure of Invention
The invention aims to provide a method for in-situ collapse blasting demolition of a reinforced concrete cooling tower, which aims to solve or improve at least one of the technical problems.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a method for in-situ collapse blasting demolition of a reinforced concrete cooling tower, which comprises the following steps:
step one, preprocessing, namely arranging a load reduction groove and an auxiliary load reduction groove on the wall of the cooling tower;
drilling blast holes on all the herringbone upright posts at the lower part of the ring beam of the cooling tower, and performing blasting incision on the herringbone upright posts to form annular blasting incision under the ring beam after blasting;
dividing two explosion areas in the annular explosion incision, and detonating detonators with two different specifications, namely 50ms in-hole delay and 500ms in-hole delay;
step four, carrying out protective measures on the blasting positions of the herringbone upright posts, wrapping the herringbone upright posts, and carrying out hanging protection on the annular blasting incisions;
and fifthly, blasting the cooling tower.
Preferably, in the first step, the pretreated object includes a reinforced concrete cooling tower water spraying platform and an external pedestrian climbing ladder which are demolished by blasting, the water spraying platform is all treated, the external pedestrian climbing ladder is completely demolished by using gas cutting according to the sequence from top to bottom, if the demolition safety risk is large, the demolition safety risk is inconvenient, the demolition safety protection device can be cut into multiple sections according to one section of each 2m, the whole supporting and connecting function is damaged, and the demolition blasting effect is ensured.
Preferably, in the first step, when the load reducing groove is formed, the ring beam of the cooling tower is damaged; and a load reducing groove is formed in each of the annular beam and the cylinder wall at each interval of four pairs of herringbone upright posts.
Preferably, in the third step, explosive is filled in the annular blasting incision of the herringbone upright post, and the detonation time difference of the two blasting areas is set in a millisecond delay mode by adopting an in-hole delay blasting technology.
Preferably, in the third step, a plurality of blast holes are distributed in each herringbone upright post, and the number of blast holes in the upper half part of the herringbone upright post is smaller than that of blast holes in the lower half part of the herringbone upright post; the charge capacity of the blast hole at the lower half part of the herringbone upright post is increased by 15-20%.
Preferably, in the third step, an electronic detonator is adopted for detonation; the two explosion areas are connected in a serial connection mode, the explosion areas are connected in a parallel connection mode, the explosion of the explosion point is ensured, and finally the explosion point is connected to the initiator.
Preferably, in the third step, in order to ensure the blasting effect, the filled explosive is a explosive roll with the diameter phi=32 mm, and the blast holes are arranged in a single row at equal intervals.
Preferably, in the second step, in order to better utilize the explosion energy, the depth l= (3/5-2/3) δ of the blast hole; the minimum resistance line is w=1/2 δ; the distance between the blast holes is (1.0-2.0) L; wherein δ is the diameter of the herringbone post.
Preferably, in the first step, in order to better disassemble the cooling tower, the height of the load reducing groove is 7 m-13 m; the width of the load reducing groove is 0.5 m-1.0 m, and the width of the auxiliary load reducing groove is 0.6 m-0.8 m.
The invention discloses the following technical effects:
according to the invention, the annular notch is formed by drilling and blasting the herringbone upright post at the bottom of the cooling tower, and the pre-dismantling of the annular beam and the cylinder wall is realized by arranging the load-reducing groove and the auxiliary load-reducing groove on the cylinder wall of the cooling tower, so that the cooling tower can be collapsed and disassembled in situ under the action of dead weight when the blasting notch is formed, the cooling tower is demolished in situ by blasting, the cooling tower collapses in a limited range, the blasting pile is more concentrated, and the damage to surrounding buildings is reduced;
according to the invention, two explosion areas are arranged in the explosion notch, and detonators with two different specifications, namely 50ms in-hole delay and 500ms in-hole delay, are adopted for detonation, so that the influence of tower collapse vibration can be effectively reduced, the in-situ collapse of the cooling tower is ensured, and the explosion device is suitable for various operation environments, particularly explosion operation with extremely complex surrounding environment and limited dumping range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure of a ring-shaped blasting slit according to the present invention;
FIG. 2 is a top view of a ring blasted incision in accordance with the present invention;
FIG. 3 is a process flow diagram of the present invention;
wherein, 1, load reducing groove; 2. an auxiliary load-reducing groove; 3. a ring beam; 4. annular blasting cuts; 5. a herringbone upright post.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1-3, the invention provides a method for in-situ collapse blasting demolition of a reinforced concrete cooling tower, comprising the following steps:
step one, preprocessing, namely arranging a load reduction groove 1 and an auxiliary load reduction groove 2 on the wall of a cooling tower;
step two, drilling blast holes on all the herringbone upright posts 5 at the lower part of the ring beam 3 of the cooling tower, and performing blasting incision on the herringbone upright posts 5 to form an annular blasting incision 4 below the ring beam 3 after blasting; through drilling and blasting the herringbone upright posts 5 at the bottom of the cooling tower to form annular cuts, and through arranging the load reducing grooves 1 and the auxiliary load reducing grooves 2 on the wall of the cooling tower, the pre-dismantling of the annular beam 3 and the wall of the cooling tower can be realized, so that when the blasting cuts are formed, the cooling tower can collapse and disintegrate in situ under the action of dead weight, the in-situ blasting dismantling is realized, the cooling tower collapses in a limited range, the blasting piles are more concentrated, and the damage to surrounding buildings is reduced;
step three, two explosion areas are divided into the annular explosion notch 4, and detonators with two different specifications, namely 50ms in-hole delay and 500ms in-hole delay, are adopted for detonation, so that the influence of tower collapse vibration can be effectively reduced, the in-situ collapse of the cooling tower is ensured, and the method is suitable for various operation environments, particularly explosion operation with extremely complex surrounding environment and limited dumping range;
step four, carrying out protective measures on the blasting part of the herringbone upright post 5, wrapping the herringbone upright post 5 by adopting 2 layers of geogrids and 10 layers of dense mesh safety nets, and simultaneously carrying out hanging protection on the annular blasting incision 4 by adopting 2 layers of 6-needle sun-proof nets;
and fifthly, blasting the cooling tower.
In a further optimization scheme, in the first step, the pretreated object comprises a reinforced concrete cooling tower water spraying platform and an external pedestrian climbing ladder which are demolished by blasting, the water spraying platform is all treated, the external crawling ladder is completely demolished by using gas cutting according to the sequence from top to bottom, if the demolition safety risk is large, the demolition safety risk is inconvenient to completely demolish, the demolition safety protection device can be cut into multiple sections according to one section of each 2m, the integral supporting and connecting function of the demolition safety protection device is damaged, and the demolition and demolition effects of blasting are ensured.
In the further optimization scheme, in the first step, when the load reducing groove 1 is formed, the ring beam 3 of the cooling tower is damaged; the annular beam 3 and the cylinder wall are provided with a load reducing groove 1 on each four pairs of herringbone upright posts 5 at intervals.
In the further optimizing scheme, in the step three, explosive is filled in the annular blasting notch 4 of the herringbone upright post 5, and the detonation time difference of the two blasting areas is set in a millisecond delay mode by adopting an in-hole delay blasting technology.
In the further optimization scheme, in the third step, a plurality of blast holes are distributed in each herringbone upright post 5, and the number of blast holes in the upper half part of the herringbone upright post 5 is smaller than that of blast holes in the lower half part; the charge capacity of the blast hole at the lower half part of the herringbone upright post 5 is increased by 15-20%; the number of the blastholes can be set according to the specific use environment, in the embodiment, 10 blastholes are distributed in each herringbone upright post 5, wherein the number of the blastholes in the upper half part is 4, the number of the blastholes in the lower half part is 6, and the number of the blastholes in the bottom is increased by 15% -20% on the basis of design drug loading; so set up, improve perforation density and the drug loading of herringbone stand 5 bottom for the blasting effect of herringbone stand 5 bottom promotes greatly, and then promotes the effect that the cooling tower collapsed in situ.
In the third step, an electronic detonator is adopted for detonation; the two explosion areas are connected in series, the explosion areas are connected in parallel, the explosion point is ensured to be subjected to quasi-explosion, and finally the explosion point is connected to the initiator; in the embodiment, 48 pairs of herringbone upright posts 5 are shared, wherein 28 pairs of herringbone upright posts 5 which are close to the center are respectively set as a first explosion area and a second explosion area by taking northwest as the center, and the rest 20 pairs of herringbone upright posts 5 are respectively set as the first explosion area and the second explosion area; the medicine in the first explosive region adopts in-hole delay of 50ms; the second explosive region is filled with the medicine with a delay of 500ms in the hole; by the arrangement, the first explosion zone and the second explosion zone are subjected to batch explosion, so that the influence of tower collapse vibration can be effectively reduced, and in-situ collapse is realized.
In a further optimized scheme, in the third step, in order to ensure the blasting effect, the filled explosive is a explosive roll with the diameter phi=32 mm; the blast holes are distributed in a single row at equal intervals.
In a further optimization scheme, in the second step, in order to better utilize explosion energy, the depth L= (3/5-2/3) delta of the blast hole is increased; the minimum resistance line is w=1/2 δ; the distance between the blast holes is (1.0-2.0) L; wherein δ is the diameter of the herringbone upright 5; wherein, the minimum resistance line refers to the shortest distance from the center or gravity of the medicine bag to the nearest free surface.
In a further optimization scheme, in the first step, in order to enable the cooling tower to be better disassembled, the height of the load reducing groove 1 is 7-13 m, the width of the load reducing groove 1 is 0.5-1.0 m, and the width of the auxiliary load reducing groove is 0.6-0.8 m.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (8)
1. The in-situ collapse blasting demolition method for the reinforced concrete cooling tower is characterized by comprising the following steps of:
step one, preprocessing, namely arranging a load reducing groove (1) and an auxiliary load reducing groove (2) on the wall of the cooling tower;
drilling blast holes on all the herringbone upright posts (5) at the lower part of the ring beam (3) of the cooling tower, and blasting the herringbone upright posts (5) to form annular blasting incisions (4) under the ring beam (3) after blasting;
step three, dividing two explosion areas in the annular explosion notch (4), and detonating detonators with two different specifications, namely 50ms in-hole delay and 500ms in-hole delay, are adopted;
step four, protective measures are implemented on the blasting positions of the herringbone upright posts (5), wrapping is implemented on the herringbone upright posts (5), and hanging protection is implemented on the annular blasting notch (4);
blasting a cooling tower;
in the first step, when a load reducing groove (1) is formed, the ring beam (3) of the cooling tower is damaged; the annular beam (3) and the cylinder wall are provided with a load reducing groove (1) at each interval of four pairs of herringbone upright posts (5).
2. The reinforced concrete cooling tower in-situ collapse blasting demolition method of claim 1, wherein: in the first step, the pretreated object comprises a reinforced concrete cooling tower water spraying platform and an external pedestrian climbing ladder which are demolished by blasting, the water spraying platform is all treated, the external crawling ladder is completely demolished by using gas cutting according to the sequence from top to bottom, if the demolishing safety risk is large, the demolishing safety risk is inconvenient to completely demolish, the demolishing safety protection device can be cut into a plurality of sections according to one section of each 2m, the integral supporting connection effect of the demolishing safety protection device is damaged, and the demolishing effect is ensured.
3. The reinforced concrete cooling tower in-situ collapse blasting demolition method of claim 1, wherein: in the third step, explosive is filled in the annular blasting notch (4) of the herringbone upright post (5), and the detonation time difference of the two explosion areas is set in a millisecond delay mode by adopting an in-hole delay blasting technology.
4. The reinforced concrete cooling tower in-situ collapse blasting demolition method of claim 1, wherein: in the third step, a plurality of blast holes are distributed in each herringbone upright post (5), and the number of blast holes in the upper half part of the herringbone upright post (5) is smaller than that of blast holes in the lower half part; the charge capacity of the blast hole at the lower half part of the herringbone upright post (5) is increased by 15-20 percent.
5. The reinforced concrete cooling tower in-situ collapse blasting demolition method of claim 1, wherein: in the third step, an electronic detonator is adopted for detonation; the two explosion areas are connected in a serial connection mode, the explosion areas are connected in a parallel connection mode, the explosion of the explosion point is ensured, and finally the explosion point is connected to the initiator.
6. The reinforced concrete cooling tower in-situ collapse blasting demolition method of claim 1, wherein: in the third step, in order to ensure the blasting effect, the filled explosive is a explosive roll with the diameter phi=32 mm; the blast holes are distributed in a single row at equal intervals.
7. The reinforced concrete cooling tower in-situ collapse blasting demolition method of claim 1, wherein: in the second step, in order to ensure that the depth L= (3/5-2/3) delta of the blast hole is formed; the minimum resistance line is w=1/2 δ; the distance between the blast holes is (1.0-2.0) L; wherein delta is the diameter of the herringbone upright post (5).
8. The reinforced concrete cooling tower in-situ collapse blasting demolition method of claim 1, wherein: in the first step, in order to better utilize the explosion energy, the cooling tower is better disassembled, and the height of the load reducing groove is 7-13 m; the width of the load reducing groove is 0.5 m-1.0 m, and the width of the auxiliary load reducing groove is 0.6 m-0.8 m.
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| CN202211234933.8A CN115523814B (en) | 2022-10-10 | 2022-10-10 | In-situ collapse blasting demolition method for reinforced concrete cooling tower |
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| CN202211234933.8A CN115523814B (en) | 2022-10-10 | 2022-10-10 | In-situ collapse blasting demolition method for reinforced concrete cooling tower |
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| CN115523814B true CN115523814B (en) | 2023-06-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4201633B2 (en) * | 2003-03-28 | 2008-12-24 | 三井住友建設株式会社 | Blasting and dismantling method of reinforced concrete structure |
| CN101967888A (en) * | 2010-10-20 | 2011-02-09 | 江苏江中集团有限公司 | Multidirectional multi-fold blasting method for high-rise building with frame-shear structure |
| CN102003921B (en) * | 2010-10-21 | 2013-04-10 | 姬云峰 | Balance blasting method |
| CN103148749B (en) * | 2013-03-25 | 2015-08-05 | 姬云峰 | A kind of symmetrical double-rotation blasting method |
| CN104089550B (en) * | 2014-03-21 | 2016-03-09 | 河南理工大学 | A kind of Reinforced Concrete Cooling Tower height compensating groove compound notch blasting demolishing method |
| CN110375600B (en) * | 2019-08-30 | 2021-08-20 | 江汉大学 | Vertical in-situ collapse blasting demolition method for high-rise structure |
| CN113338665B (en) * | 2021-06-10 | 2022-10-11 | 中铁六局集团石家庄铁路建设有限公司 | Cooling tower dismantling method |
| CN113720225B (en) * | 2021-07-28 | 2023-07-11 | 安徽江南***工程有限公司 | Blasting demolition construction method for irregular-shaped frame-core tube high building |
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