CN108731566B - Method for blasting demolishing angle steel structure of prefabricated granular medium module - Google Patents
Method for blasting demolishing angle steel structure of prefabricated granular medium module Download PDFInfo
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- CN108731566B CN108731566B CN201810505055.6A CN201810505055A CN108731566B CN 108731566 B CN108731566 B CN 108731566B CN 201810505055 A CN201810505055 A CN 201810505055A CN 108731566 B CN108731566 B CN 108731566B
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- angle steel
- steel
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- dismantled
- prefabricated
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 238000005422 blasting Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000004033 plastic Substances 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 8
- 230000000903 blocking effect Effects 0.000 claims abstract description 4
- 239000003814 drug Substances 0.000 claims abstract description 4
- 239000004576 sand Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims 1
- 239000002360 explosive Substances 0.000 abstract description 20
- 238000005520 cutting process Methods 0.000 abstract description 8
- 230000006378 damage Effects 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 3
- 239000004575 stone Substances 0.000 abstract description 3
- 238000004880 explosion Methods 0.000 abstract description 2
- 239000000839 emulsion Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000005474 detonation Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/28—Cores; Mandrels
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a method for blasting demolishing of angle steel structure prefabricated granular media. The method comprises the following steps: (1) Manufacturing an auxiliary angle steel piece identical to the angle steel to be blasted and dismantled; (2) Welding the long side of the auxiliary angle steel with the angle steel to be blasted and dismantled to form a hollow cylindrical steel beam with a rectangular section; (3) welding the bottom of the hollow cylindrical steel girder by using a steel plate; (4) transverse cutting pre-cracks on the back of the angle steel to be removed; (5) manufacturing a plastic cuboid cylindrical die; (6) Filling a granular medium into a plastic cuboid cylindrical mold, and pre-burying a pre-buried PVC pipe in the center of the mold; (7) And (3) filling the medicine bags into the openings at the upper ends of the pre-buried PVC pipes, and blocking the openings of the PVC pipes by using stemming to obtain the prefabricated granular medium medicine filling modules. (8) And loading the prefabricated granular medium charging module into the hollow cylindrical steel beam, and detonating. The explosive has high utilization rate, can select various charging modes and interval modes, has little harm to flying stones and shock waves generated by explosion, and is easy to protect.
Description
Technical Field
The invention belongs to the technical field of engineering blasting, and particularly relates to a method for blasting and dismantling an angle steel structure by a prefabricated particle medium module.
Background
When the steel medium member or the building structure is demolished by blasting, the steel medium member or the building structure cannot be perforated, charged and blasted due to the hollow structure and even plate-shaped material, and only the processes of explosive charge collection, explosive charge external application and concrete blasting in a welded cylinder can be adopted.
The above process has obvious technical drawbacks.
1. The explosive-gathering bag is blasted by adopting high-intensity Gao Baosu explosive, most of the explosive is a tube product, and the civil use is difficult to realize; meanwhile, the shaped explosive package processed by the high-intensity and high-explosion-speed explosive can only jet flow to act on the blasting cutting of the sheet material, namely, only a cutting joint can be formed on a steel plate, and a large opening cannot be produced, so that the whole structure is damaged and unstably.
2. The explosive powder blasting of the external application explosive bag is closely attached to the explosive of the object to be removed, the function is locally concentrated at the contact position, most of the energy of the explosive which is not closely attached to the object to be removed does not directly act on the object to be removed, most of the energy does idle work, and the generated blast shock wave, blasting flying stone and noise are not easy to prevent and control and cannot be implemented in living and production environments with complex environments.
3. The cylindrical internal concrete blasting is only suitable for cylindrical steel structures with larger cross-sectional areas, the construction site concrete pouring and maintenance time is long, the poured concrete structure is damaged by the punching operation, the damage in the concrete is unknown, the judgment of the loading capacity is affected, and the welding and pouring operation difficulty is high in a complex environment.
Disclosure of Invention
The invention provides a method for blasting and dismantling an angle steel structure prefabricated particle medium module in order to overcome the defects of the prior art.
The technical scheme of the invention is as follows: the method for blasting and dismantling the angle steel structure prefabricated granular medium module comprises the following steps:
(1) Manufacturing an auxiliary angle steel piece identical to the angle steel to be blasted and dismantled;
(2) Welding the long side of the auxiliary angle steel with the angle steel to be blasted and dismantled to form a hollow cylindrical steel beam with a rectangular section;
(3) The bottom of the hollow cylindrical steel girder is welded in a seamless way by using a steel plate which is made of the same material as the angle steel;
(4) The back of the angle steel to be dismantled is transversely cut into pre-cracks;
(5) Manufacturing a plastic cuboid cylindrical mold by taking two side data of blasting demolishing angle steel as length and width, wherein the bottom of the mold is sealed, and the upper end of the mold is opened;
(6) Erecting a plastic cuboid cylindrical mold, filling granular media along an upper end opening to a certain height, after the granular media naturally subside, pre-burying a pre-buried PVC pipe with the length slightly higher than the upper end opening in the center of the mold, and continuously filling the granular media between the outer wall of the pre-buried PVC pipe and the inner wall of the mold until the granular media naturally subside, and keeping the mold and the pre-buried PVC pipe in a vertical state all the time, wherein the height of the granular media is slightly lower than the upper end opening of the mold;
(7) Filling a medicine bag along the upper end opening of the pre-buried PVC pipe according to the design dosage, and blocking the mouth of the PVC pipe by using stemming to obtain a prefabricated granular medium filling module;
(8) And loading the prefabricated granular medium charging module into the hollow cylindrical steel beam, and detonating after the preparation work is completed before warning and protection blasting.
According to an embodiment of the invention, the particulate medium is a sand medium.
The prefabricated module assembled blasting demolition steel structure is realized through four key technical points:
1. welding angle steel to be dismantled into a steel beam;
2. manufacturing a charging mould, and reserving charging holes when pouring granular media in the mould;
3. the prefabricated module is internally reserved with a charge hole, and the dosage, the charge mode, the interval mode and the spacer type can be adjusted and selected according to actual conditions;
4. the central axis of the embedded PVC pipe is required to coincide with the central axis of the hollow steel beam; the PVC pipe is ensured to be at the center of the hollow steel beam.
By adopting the technical scheme, the invention has the advantages compared with the existing method that: 1. the 2# rock emulsion explosive is easier to obtain than the controlled explosive; 2. the utilization rate of the explosive is high, the cost of the explosive is saved, and the smaller dosage reaches the expected target; 3. multiple charging modes and interval modes can be selected, and the explosive is used as the functional force more fully; 4. explosive is filled into the angle steel, flying stones and shock waves generated by explosion are less in harm, and the protection is easy.
Drawings
Fig. 1 is a schematic view of a hollow cylindrical steel girder.
Fig. 2 is a schematic view of a plastic rectangular cylindrical mold.
Fig. 3 is a schematic view of the assembly of a preformed particulate media charge module.
In the figure: 1-attaching angle steel; 2, demolishing angle steel to be blasted; 3-steel gaskets; 4-sand media; 5-embedding a PVC pipe; 6-pre-lancing; 7-blasting cartridge; 8-cuboid barrel mould.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description, without limiting the scope of protection.
The method comprises the following steps of 1, manufacturing an auxiliary angle steel 1 with the same size as an angle steel 2 to be blasted and dismantled, and making the length of the auxiliary angle steel 1 150cm by using a prefabricated particle medium module assembly method of the blasted and dismantled angle steel structure; aligning the long side of the auxiliary angle steel 1 corresponding to the long side and the short side of the angle steel 2 to be blasted and removed, welding into a hollow cylindrical steel beam by using electric welding, and sealing the bottom of the hollow steel beam by using a steel gasket 3; cutting transverse and longitudinal pre-cutting slits 6 at intervals of 5cm from the outer side of the angle steel 2 to be blasted and dismantled between 50cm and 100cm in length of the hollow steel beam, wherein the length is 40mm, and the width is 5mm; customizing a plastic cuboid cylindrical die 8 with the cross section size of 78 x 78cm, the thickness of 3mm and the length of 150cm; filling sand medium 4 along the upper end opening of the plastic cuboid cylindrical die 8, wherein the grain diameter is 0.25-0.35mm, inserting a pre-buried PVC pipe 5 with the length of 105cm and the diameter of 40cm into the opening of the plastic cuboid cylindrical die 8 after the sand medium 4 is settled and the height of the sand medium 4 is 50cm, keeping the PVC pipe at the right center of the hollow steel girder, and inserting the pre-buried PVC pipe 5 into the poured sand medium 4 with the depth of 5cm; and pouring the sand medium 4 between the inner wall of the plastic cuboid cylindrical die 8 and the outer wall of the embedded PVC pipe 5 until the height of the sand medium 4 is flush with the height of the hollow steel beam opening after sedimentation. Filling a blasting cartridge 7 into the embedded PVC pipe 5 along the pipe orifice of the embedded PVC pipe 5, wherein 150g of 2# rock emulsion explosive is filled from the bottom 50cm, 3 sections of explosive are filled, 50g of each section is filled, and 15cm of air is spaced between each section; 3 ms-3 detonating tube detonator. The detonation can be performed after the preparation work before the detonation such as stemming blocking, protection, evacuation, warning and the like.
The size of the auxiliary angle steel 1 is 80mm, 8mm and 150cm; the size of the back cover steel gasket 3 is 10cm x 1cm; the rectangular cylindrical die is made of polypropylene, and the cross section size is 78 x 78cm, the thickness is 3mm and the length is 150cm; the grain diameter of the casting sand is 0.25-0.35mm; the size of the embedded PVC pipe is 105cm long, 40cm in diameter and 3mm in wall thickness; the length of the pre-cutting seam is 40mm, the width of the pre-cutting seam is 5mm, and the pre-cutting seam is along the right-angle back of the angle steel to be removed; 50g of each 15cm air space charge is filled with 1 detonator, and 150g of No. 2 rock emulsion explosive and 3 ms-3 detonators are used in total. The final test effect was cut to a length of 41cm and a breaking length of 42cm.
Claims (2)
1. A method for blasting demolition of angle steel structure of prefabricated granular medium module is characterized by comprising the following steps:
(1) Manufacturing an auxiliary angle steel piece identical to the angle steel to be blasted and dismantled;
(2) Welding the long side of the auxiliary angle steel with the angle steel to be blasted and dismantled to form a hollow cylindrical steel beam with a rectangular section;
(3) The bottom of the hollow cylindrical steel girder is welded in a seamless way by using a steel plate which is the same as the angle steel to be blasted and dismantled;
(4) Pre-cracking is transversely cut at the back of the angle steel to be blasted and dismantled;
(5) Manufacturing a plastic cuboid cylindrical mold by taking two edge data of angle steel to be blasted and dismantled as length and width, wherein the bottom of the plastic cuboid cylindrical mold is sealed, and the upper end of the plastic cuboid cylindrical mold is opened;
(6) Erecting a plastic cuboid cylindrical die, filling granular media along an upper end opening to a certain height, pre-burying a pre-buried PVC pipe with the length slightly higher than the upper end opening in the middle of the plastic cuboid cylindrical die after the granular media naturally subside, and continuously filling the granular media between the outer wall of the pre-buried PVC pipe and the inner wall of the plastic cuboid cylindrical die until the granular media naturally subside to a height slightly lower than the upper end opening of the plastic cuboid cylindrical die, so that the plastic cuboid cylindrical die and the pre-buried PVC pipe are kept in a vertical state all the time;
(7) Filling a medicine bag along the upper end opening of the pre-buried PVC pipe according to the design dosage, and blocking the mouth of the pre-buried PVC pipe by using stemming to obtain a prefabricated granular medium filling module;
(8) And loading the prefabricated granular medium charging module into the hollow cylindrical steel beam, and detonating after the preparation before blasting is finished.
2. The method for blasting demolition of angle steel structures in a prefabricated granular media module of claim 1, wherein the granular media is sand media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505055.6A CN108731566B (en) | 2018-05-24 | 2018-05-24 | Method for blasting demolishing angle steel structure of prefabricated granular medium module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505055.6A CN108731566B (en) | 2018-05-24 | 2018-05-24 | Method for blasting demolishing angle steel structure of prefabricated granular medium module |
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| Publication Number | Publication Date |
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| CN108731566A CN108731566A (en) | 2018-11-02 |
| CN108731566B true CN108731566B (en) | 2023-04-28 |
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| CN201810505055.6A Active CN108731566B (en) | 2018-05-24 | 2018-05-24 | Method for blasting demolishing angle steel structure of prefabricated granular medium module |
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| CN113432500B (en) * | 2021-08-06 | 2022-09-30 | 安徽理工大学 | Blasting method for fracture-containing dangerous rock mass |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2904338C2 (en) * | 1979-02-06 | 1982-05-13 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Method of destroying concrete walls or the like. Objects made of similar material due to the effects of explosions |
| JP6160859B2 (en) * | 2013-04-24 | 2017-07-12 | 株式会社カコー | Steel structure dismantling method |
| CN103938888B (en) * | 2014-05-14 | 2016-01-27 | 中钢集团武汉安全环保研究院有限公司 | The blasting demolishing method of a kind of tubular steel column structure construction of structures |
| CN105823386B (en) * | 2016-06-03 | 2017-06-09 | 武汉科技大学 | The blasting demolishing method of reinforced concrete brace in a kind of foundation ditch |
| CN107858941B (en) * | 2017-11-16 | 2019-06-28 | 南京交通工程有限公司 | A kind of hydraulic pressure demolition dismounting Prestressed Continuous Box Beam bridge construction technique |
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