CN110530218B - Method for demolishing angle steel without punching blasting - Google Patents
Method for demolishing angle steel without punching blasting Download PDFInfo
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- CN110530218B CN110530218B CN201810505037.8A CN201810505037A CN110530218B CN 110530218 B CN110530218 B CN 110530218B CN 201810505037 A CN201810505037 A CN 201810505037A CN 110530218 B CN110530218 B CN 110530218B
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- angle steel
- blasting
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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
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
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- General Engineering & Computer Science (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a method for dismantling angle steel without punching blasting. The method comprises the following steps: step 1: manufacturing an auxiliary angle steel block which is the same as the angle steel to be demolished by blasting; step 2: seamlessly welding the auxiliary angle steel and the angle steel to be demolished by blasting into a cylindrical steel beam with a rectangular cross section, and seamlessly welding a back cover with the bottom of the steel beam by using a steel plate; and step 3: transversely cutting a pre-crack at the back of the angle steel to be dismantled; and 4, step 4: pouring granular media or concrete into the steel beam along the opening at the upper end of the steel beam, inserting a PVC pipe into the granular media or concrete along the center of the steel beam after the steel beam reaches a certain height, and pouring the granular media or concrete between the inner wall of the steel beam and the outer wall of the pre-buried PVC pipe; and 5: filling a medicine bag along the pre-buried PVC pipe; step 6: and (5) detonating. The invention has high utilization rate of explosive, the explosive is filled in the angle steel, the damage of flyrock and shock wave generated by explosion is small, and the angle steel is easy to protect.
Description
Technical Field
The invention belongs to the technical field of engineering blasting, particularly relates to the technical field of blasting demolition of steel structure members of angle steels and building structures, and particularly relates to a method for demolishing the angle steels without punching blasting.
Background
When the steel medium member or the building is demolished by blasting, because the structure is hollow or even a plate-shaped material, the blasting of punching, charging and blasting cannot be carried out, and the blasting process of building concrete in a cylinder formed by energy-collecting explosive bags, external application explosive bags and welding can only be adopted.
The above processes have significant technical drawbacks.
1. Blasting of the energy-gathered explosive bags needs to adopt high-brisance and high-detonation-velocity explosives which are mostly tube products and are difficult to realize for civil use; meanwhile, the energy-gathered explosive charge processed by the high-brisance high-detonation velocity explosive can only jet to act on plate blasting cutting, namely, only a slot can be cut on a steel plate, and a large opening cannot be generated, so that the whole structure is damaged and destabilized.
2. The explosive bag is externally applied to explode and cling to the object to be dismantled, the work doing capability of the explosive is locally concentrated at the contact part and does not cling to the object to be dismantled, most of the energy of the explosive does not directly act on the object to be dismantled, most of the energy of the explosive does not do useless work, and the generated explosion shock wave, explosion flyrock and noise are difficult to prevent and control and cannot be implemented in living and production environments with complex environments.
Disclosure of Invention
The invention provides a method for dismantling angle steel without perforation and blasting aiming at the structural characteristics of a building structure of the angle steel structure to overcome the defects of the prior art.
The technical solution of the invention is as follows: a method for demolishing angle steel without punching blasting comprises the following steps:
step 1: manufacturing an auxiliary angle steel block which is the same as the angle steel to be demolished by blasting;
step 2: seamlessly welding the auxiliary angle steel and the angle steel to be demolished by blasting into a cylindrical steel beam with a rectangular cross section, and seamlessly welding a back cover with the bottom of the steel beam by using a steel plate;
and step 3: transversely cutting a pre-crack at the back of the angle steel to be dismantled;
and 4, step 4: pouring granular media or concrete into the steel beam along the opening at the upper end of the steel beam, inserting a PVC pipe into the granular media or concrete along the center of the steel beam after the height is reached, keeping the embedded PVC pipe vertical, and continuing pouring the granular media or concrete between the inner wall of the steel beam and the outer wall of the embedded PVC pipe until the granular media or concrete is leveled with the opening of the steel beam after sedimentation;
and 5: filling explosive packages along the pre-buried PVC pipe, and then using stemming to block the opening of the PVC pipe;
step 6: and detonating after the preparation work before protection and warning blasting is finished.
According to an embodiment of the invention, the particulate medium is sand.
According to the embodiment of the invention, the concrete contains 300% of cement, and the proportion of water, sand and cement is 1: 3: 1.
the invention realizes the method for dismantling the angle steel without punching blasting through four key technical points:
1. welding angle steel to be dismantled into a steel beam;
2. pouring concrete in the steel beam in situ and reserving a medicine loading hole;
3. reserving a medicine loading hole, and adjusting and selecting the medicine amount, the medicine loading mode, the spacing mode and the type of the spacer according to actual conditions;
4. without any drilling construction.
By adopting the technical scheme, compared with the existing method, the method has the advantages that:
1. the 2# rock emulsion explosive is easier to obtain than a tubular explosive;
2. the utilization rate of the explosive is high, the cost of the explosive is saved, and the smaller amount of the explosive reaches the expected target;
3. various charging modes and interval modes can be selected, and the work-doing capability of the explosive is more fully utilized;
4. the explosive is filled in the angle steel, so that flying stones and shock waves generated by explosion are less harmful, and the angle steel is easy to protect.
Drawings
FIG. 1 is a schematic view of a hollow steel beam.
Fig. 2 is a schematic view of cast-in-place completion.
Fig. 3 is a schematic view of the completion of the charge.
In the figure: 1-auxiliary angle steel; 2, dismantling the angle steel to be blasted; 3-a steel gasket; 4-sand or concrete; 5-embedding a PVC pipe; 6-pre-cutting a seam; 7-blasting cartridge.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments, without limiting its scope.
Example 1: manufacturing an auxiliary angle steel 1 with the same size (80 mm x 8 mm) as the angle steel 2 to be demolished by blasting, wherein the length of the auxiliary angle steel 1 is 150 cm; aligning the long side of the auxiliary angle steel 1 corresponding to the long side of the angle steel 2 to be demolished by blasting and the short side corresponding to the short side, welding the aligned long sides and short sides into a hollow cylindrical steel beam by electric welding, and then sealing the bottom of the hollow steel beam by using a steel gasket 3, as shown in figure 1; cutting horizontal and longitudinal pre-cut seams 6 with the length of 40mm and the width of 5mm at intervals of 5cm from the outer sides of the angle steel 2 to be demolished and demolished with the hollow steel beam with the length of 50cm to 100 cm; pouring sand 4 with the particle size of 0.25-0.35mm into the hollow steel beam along the opening of the hollow steel beam, inserting a pre-buried PVC pipe 5 with the length of 105cm and the diameter of 40cm into the opening of the hollow steel beam after the height of the pre-buried PVC pipe is 50cm, keeping the pre-buried PVC pipe 5 positioned in the center of the hollow steel beam, and inserting the pre-buried PVC pipe 5 into the poured sand 4 to the depth of 5 cm; and continuously pouring sand 4 between the inner wall of the hollow steel beam and the outer wall of the embedded PVC pipe 5 until the height of the settled sand 4 is flush with the opening height of the hollow steel beam. And (3) loading blasting cartridges 7 to the bottom of the embedded PVC pipe 5 along the pipe orifice of the embedded PVC pipe 5, wherein 150g of 2# rock emulsion explosive (the explosive loading position is 50cm from the bottom, the explosive is loaded in 3 sections, each section is 50g, and the air interval of each section is 15 cm) and 3-shot ms & lt-3 & gt detonating tube detonators. And detonating can be carried out after preparation works before detonating, such as stemming blockage, protection, evacuation, warning and the like are carried out.
The dimension of the auxiliary angle steel 2 in the embodiment 1 is 80mm by 8mm, and the length is 150 cm; the size of the bottom sealing steel gasket 3 is 10cm by 1 cm; the grain diameter of the casting sand 4 is 0.25-0.35 mm; the size of the pre-buried PVC pipe 5 is 105cm in length, 40cm in diameter and 3mm in wall thickness; the precut slot 6 is 40mm long and 5mm wide and is along the right-angle back of the angle steel 1 to be dismantled; 50g of explosive is filled in every 15cm of air space, 1 detonator is filled, and 150g of 2# rock emulsion explosive and 3 ms-3 detonator are used in total. Final test results the cut length was 40cm and the failure length was 42 cm.
Example 2: manufacturing an auxiliary angle steel 1 with the same size (80 mm x 8 mm) as the angle steel 2 to be demolished by blasting, wherein the length of the auxiliary angle steel 1 is 150 cm; aligning the long side of the auxiliary angle steel 1 corresponding to the long side of the angle steel 2 to be demolished by blasting and the short side corresponding to the short side, welding the aligned long side and short side into a hollow cylindrical steel beam by electric welding, and then sealing the bottom of the hollow steel beam by using a steel gasket 3; cutting horizontal and longitudinal pre-cut seams 6 with the length of 40mm and the width of 5mm at intervals of 5cm from the outer sides of the angle steel 2 to be demolished and with the length of the hollow steel beam of 50cm to 100 cm; pouring concrete 4 with the mark number of 300 into the hollow steel beam along the opening of the hollow steel beam, inserting a pre-buried PVC pipe 5 with the length of 105cm and the diameter of 40cm into the opening of the hollow steel beam after the pouring height is 50cm, keeping the PVC pipe at the center of the hollow steel beam, and inserting the pre-buried PVC pipe 5 into the poured concrete 4 to the depth of 5 cm; concrete 4 continues to be poured between the inner wall of the hollow steel beam and the outer wall of the embedded PVC pipe 5 until the height of the concrete 4 after sedimentation is flush with the opening height of the hollow steel beam. And curing the concrete for 28 d. And (3) loading blasting cartridges 7 to the bottom of the embedded PVC pipe 5 along the pipe orifice of the embedded PVC pipe 5, wherein 150g of 2# rock emulsion explosive (the explosive loading position is 50cm from the bottom, the explosive is loaded in 3 sections, each section is 50g, and the air interval of each section is 15 cm) and 3-shot ms & lt-3 & gt detonating tube detonators. And detonating can be carried out after preparation works before detonating, such as stemming blockage, protection, evacuation, warning and the like are carried out. In example 2, the dimension of the auxiliary angle steel 1 is 80mm by 8mm, and the length is 150 cm; the size of the bottom sealing steel gasket 3 is 10cm by 1 cm; the mark number of cement in the poured concrete 4 is 300, and the proportion of water, sand and cement is 1: 3: 1; the size of the pre-buried PVC pipe 5 is 105cm in length, 40cm in diameter and 3mm in wall thickness; the precut slot 6 is 40mm long and 5mm wide and is along the right-angle ridge of the angle steel to be dismantled; 50g of explosive is filled in every 15cm of air space, 1 detonator is filled, and 150g of 2# rock emulsion explosive and 3 ms-3 detonator are used in total. Final test results cut length 48cm, failure length 62 cm.
Claims (3)
1. A method for demolishing angle steel without punching blasting is characterized by comprising the following steps:
step 1: manufacturing an auxiliary angle steel block which is the same as the angle steel to be demolished by blasting;
step 2: seamlessly welding the auxiliary angle steel and the angle steel to be demolished by blasting into a cylindrical steel beam with a rectangular cross section, and seamlessly welding a back cover with the bottom of the steel beam by using a steel plate;
and step 3: transversely cutting a pre-crack at the back of the angle steel to be demolished by blasting;
and 4, step 4: pouring granular media or concrete into the steel beam along the opening at the upper end of the steel beam, inserting a PVC pipe into the granular media or concrete along the center of the steel beam after the height is reached, keeping the embedded PVC pipe vertical, and continuously pouring the granular media or concrete between the inner wall of the steel beam and the outer wall of the embedded PVC pipe until the granular media or concrete is leveled with the opening of the steel beam after sedimentation;
and 5: filling explosive packages along the pre-buried PVC pipe, and then using stemming to block the opening of the PVC pipe;
step 6: and detonating after the preparation work before protection and warning blasting is finished.
2. The method for demolishing angle iron without perforating blasting according to claim 1, wherein the granular medium is sand.
3. The method for demolishing angle iron without perforating blasting according to claim 1, wherein the concrete has a cement mark of 300, and the ratio of water, sand and cement is 1: 3: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505037.8A CN110530218B (en) | 2018-05-24 | 2018-05-24 | Method for demolishing angle steel without punching blasting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505037.8A CN110530218B (en) | 2018-05-24 | 2018-05-24 | Method for demolishing angle steel without punching blasting |
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| CN110530218A CN110530218A (en) | 2019-12-03 |
| CN110530218B true CN110530218B (en) | 2021-09-07 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2189630Y (en) * | 1994-05-18 | 1995-02-15 | 陈维平 | Early-predetaching mould lifting-head |
| KR19980079219A (en) * | 1997-04-30 | 1998-11-25 | 공용조 | How to install molding explosives for cutting section steel |
| CN102383611A (en) * | 2012-01-11 | 2012-03-21 | 浙江大学 | Construction method for steel structure beam penetrating column |
| CN104295077A (en) * | 2013-07-17 | 2015-01-21 | 五冶集团上海有限公司 | Annular hanging platform for mounting stove shell of hot-blast stove, and mounting and dismounting method thereof |
| CN104452825A (en) * | 2014-10-13 | 2015-03-25 | 华东交通大学 | Post-cast strip replacing supporting structure used for disassembling building envelope support |
| CN105839976A (en) * | 2015-01-13 | 2016-08-10 | 国家电网公司 | Reinforcement method for angle iron of power transmission tower, and component |
-
2018
- 2018-05-24 CN CN201810505037.8A patent/CN110530218B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2189630Y (en) * | 1994-05-18 | 1995-02-15 | 陈维平 | Early-predetaching mould lifting-head |
| KR19980079219A (en) * | 1997-04-30 | 1998-11-25 | 공용조 | How to install molding explosives for cutting section steel |
| CN102383611A (en) * | 2012-01-11 | 2012-03-21 | 浙江大学 | Construction method for steel structure beam penetrating column |
| CN104295077A (en) * | 2013-07-17 | 2015-01-21 | 五冶集团上海有限公司 | Annular hanging platform for mounting stove shell of hot-blast stove, and mounting and dismounting method thereof |
| CN104452825A (en) * | 2014-10-13 | 2015-03-25 | 华东交通大学 | Post-cast strip replacing supporting structure used for disassembling building envelope support |
| CN105839976A (en) * | 2015-01-13 | 2016-08-10 | 国家电网公司 | Reinforcement method for angle iron of power transmission tower, and component |
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| CN110530218A (en) | 2019-12-03 |
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