CN100370107C - Electrifying dismounting method for steel reinforced concrete structure building - Google Patents
Electrifying dismounting method for steel reinforced concrete structure building Download PDFInfo
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- CN100370107C CN100370107C CNB2006101172797A CN200610117279A CN100370107C CN 100370107 C CN100370107 C CN 100370107C CN B2006101172797 A CNB2006101172797 A CN B2006101172797A CN 200610117279 A CN200610117279 A CN 200610117279A CN 100370107 C CN100370107 C CN 100370107C
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Abstract
The invention relates to an electrifying dismantling method for reinforced concrete structure. The method includes the following steps: selecting several pillars as destroying object and taking rapidly corrosion to the inner reinforced steel bar; taking process the pillars: taking insulation process to the section of the reinforced steel bar, inserting light-round reinforced steel bar that has the same diameter, connecting the stainless steel block or copper sheet with the negative pole of DC power supply to fasten corrosion, shutting down power supply, and starting dynamo to supply cross-range pull to the pillars. The invention has the advantages of low cost, convenient to operate, controllable process and little disturbance to environment. It could improve the dismantling efficiency and save manpower and material resources.
Description
Technical field
What the present invention relates to is the electrifying dismounting method of a kind of method of technical field of buildings, particularly a kind of steel reinforced concrete structure building.
Background technology
At present, the infrastructure of China be in extensive newly-built and large amount of building aging and deposit the stage, the renewal of appearance of city makes the removal behavior of old building frequent day by day.The dismounting of existing both at home and abroad relevant building and separate body technique and mainly contain: special dismounting methods such as demolition blasting method, dismantling prestressing method, mechanical removal method, quiet bulbs of pressure demolition reduction method, hot melt cutting disassembling method, the employing high pressure fire hose, laser etc.Wherein the demolition blasting method is most widely used, and its basic skills is a close blast hole drilling on the supporting member of structure, adopts moment to ignite simultaneously or the elementary errors ignition, demolishs works fast.But shortcoming is to lack accurate and unified theory, and the early-stage preparations complexity certain risk is arranged, and cost is higher.
It is to cause one of principal element that total destroys that the prior art document has been introduced the corrosion of reinforcing bar in the concrete.As Hong Naifeng, reinforcement corrosion and guard technology (1) in the concrete---reinforcement corrosion harm with to concrete destruction, industrial construction, 1999,29 (8), 66～68.Corrosion of steel bar can not only be cut down section area, makes the component load-bearing ability drop, also can reduce reinforcing bar and concrete bond stress, influences both cooperative performances.Simultaneously,, thereby reduced the stress performance and the endurance quality of structure, destroyed the safety of structure because volume expansion behind the corrosion of steel bar causes concrete cover to break, even come off.But these researchs are all prevented the corrosion effect of reinforcing bar, are not expected and can oppositely utilize this effect to reach the purpose of dismantling concrete structure when work threatens greatly and makes great efforts one of structural safety.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of electrifying dismounting method of steel reinforced concrete structure building is provided.Make its corrosion effect of utilizing reinforcing bar in the concrete more fully, realize fast, remove safely, effectively steel reinforced concrete structure building.
Technical scheme of the present invention specifically comprises the steps:
1., according to treating the stress system and the Architectural Mechanics knowledge of dismounting structure, choose that some pillars make the reinforcing bar in these posts that corrosion take place to quicken as destroying object in the structure.The principle that these pillars are chosen is the slump that their destruction will cause total.Selection to the destruction post of diverse location can make structure collapse towards different directions.
2., choose destroy post after, each pillar is carried out following processing: bar cutting face is done insulation handle, in the pillar internal drilling, insert plain bar with the hole equivalent diameter, piece of stainless steel or copper sheet are linked to each other with the negative electrode of dc source, form the loop, pillar twines a circle with iron chains and iron chains is linked to each other with motor.
Describedly bar cutting face is done insulation handle, be meant: earlier with the bar cutting at capital in these posts and post basal cross section place, and bar cutting face is done insulation handle, make reinforcing bar and outside reinforcing bar in this post no longer have electrical connectivity.Because the contact effect of stirrup, vertical muscle of all of this post inside and stirrup all are electric connections.
The plain bar of described insertion and hole equivalent diameter, be meant: in order to strengthen the influence degree of corrosion of steel bar the pillar bearing capacity, guarantee that in post pillar can destroy after the abundant corrosion of reinforcing bar, diverse location place boring in pillar, insert plain bar then with the hole equivalent diameter, these extrapolation reinforcing bars closely contact with vertical muscle, and therefore after energising, corrosion takes place together for the extrapolation reinforcing bar in the post, vertical muscle and stirrup.
The plain bar of described insertion and hole equivalent diameter, its position are determined by the following method:
A, vertical at pillar: from top to bottom with selected several zones of the spacing that equates, serve as vertical interval in zone, every place with the protective layer thickness of twice along the pillar short transverse, and each determines that 3 pillar cross sections arrange the extrapolation reinforcing bar;
B, in determining the pillar cross section: along the long side direction in pillar cross section, arrange the extrapolation reinforcing bar, run through the pillar cross section in the both sides immediate area of the vertical muscle of middle institute cloth.If arrange these extrapolation reinforcing bars after check, the effective resistance to compression area of the residue in pillar cross section still is enough to resist a power effect, also need arrange the extrapolation reinforcing bar too at the short side direction in pillar cross section.
Can described checking computations behind the configuration extrapolation reinforcing bar, need the residue effective resistance to compression area of checking computations cross section after the bloated effect performance of rust of reinforcing bar also resist the effect of a power.When determining cross section residue effective area, for the purpose of conservative, extrapolation reinforcing bar one-sided influences the one-tenth-value thickness 1/10 that width is taken as this pillar concrete cover.Concrete checking computations process is to obtain the average compressive stress value with the suffered axle power value of this pillar divided by cross section residue effective area, sees that whether it is greater than concrete compressive strength standard value.As greater than, illustrate that the cross section will destroy, the residue effective area in cross section is not enough to the effect of opposing axle power, otherwise, illustrate that then the effective resistance to compression area of residue in cross section still is enough to the effect of opposing axle power.
During the dismantling concrete structure, structure is in the operating mode that only is subjected to the dead load effect.According to calculating, the load-bearing pillar of structure except axle power, also comprises two-way moment of flexure and shearing at the internal force that produces under the dead load effect.For the purpose of conservative, do not consider earlier the destruction of moment of flexure and shearing pair cross-section here.The quantity of the extrapolation reinforcing bar of arranging should make the residue effective resistance to compression area of cross section after the reinforcing bar rust expands the effect performance hold effect that can't stand a power, the effect of moment of flexure and shearing so in addition, and the cross section will inevitably be destroyed.
The introducing of these extrapolation reinforcing bars is obvious for the supporting capacity effect of destroying pillar: on the one hand, in the cross section, the bloated interaction energy of the rust of extrapolation reinforcing bar significantly destroys the core space concrete, and the effective bearing area in cross section is reduced greatly, and supporting capacity is corresponding significantly to be reduced.On the other hand, at each vertical select location place of pillar, extrapolation reinforcing bar rust expand act on vertical stack can make three at interval the pillar cross section in the adjacent sections scope of twice protective layer thickness all destroy basically.Like this, pillar just has been divided into some segments from these select locations.According to existing result of study, after the vertical abundant corrosion of muscle, itself and concrete cementation meeting completely lose in the post, can think that promptly vertical muscle no longer has effect of contraction to the core space concrete.Therefore, can think there is not mutual effect of contraction basically between these separated segment pillars, and also bear two-way moment of flexure and the shearing action that the dead load effect produces on each little shell of column, so will rotate each other and the translation displacement, make the whole pillar destruction of collapsing.
Described piece of stainless steel or copper sheet are linked to each other with the negative electrode of dc source, form the loop, be meant: a certain reinforcing bar that will select post links to each other with the anode of external direct current power supply.Smear pitch simultaneously in the selected zone of exterior posts and add graphite or spray zinc layer conductive coating, in coating, bury piece of stainless steel or copper sheet underground.Then piece of stainless steel or copper sheet are linked to each other with the negative electrode of dc source, form the loop.
Describedly twine a circle and link to each other, be meant: near the position of the capital circle iron chains that is fastened, then the motor of iron chains with the distant place linked to each other on pillar top with motor with iron chains.
3., start each dc source, make the quick corrosion of reinforcing bar in these selected posts.
Each dc source of described startup is meant: start the dc source that each links to each other with selected post, and by controlling the size of current in each loop, make the corrosion degree of each selected post keep synchronous substantially.
Theoretical foundation is according to Faraday's law, and there are direct proportionate relationship in the size of current that dc source provides and the corrosion rate of reinforcing bar, so can control the corrosion rate of reinforcing bar by adjusting size of current.
4., close each power supply, starter motor applies the side direction pulling force for each post.
Described each power supply of closing is meant: according to field observation, when pillar occurs closing on the sign of destruction, close each dc source.
Described each post of giving applies the side direction pulling force, is meant: motor applies a side direction pulling force for simultaneously each post by iron chains, and each post is destroyed, and structure is collapsed towards predetermined direction.
The present invention has that cost is not high, convenient and easy, process is controlled, to characteristics such as environmental disturbances are few, not only can effectively improve the efficient of demolishing buildings, can also significantly use manpower and material resources sparingly.
Description of drawings
Accompanying drawing 1 is the schematic diagram that corrosion is quickened in energising to the inside configuration reinforcing bar.
Accompanying drawing 2 is the post network arrangements figure of certain multispan multi-layer concrete structure.
Accompanying drawing 3 is the selected vertical extrapolation reinforcement placement figure of post.
Accompanying drawing 5 is the schematic cross-section of No. 2 and No. 6 post bidirectional arrangements extrapolation reinforcing bars.
Accompanying drawing 6 is the post network plane figure of certain single span multi-layer concrete frame construction.
The specific embodiment
Shown in accompanying drawing 1,2,3.For a certain structure that needs dismounting,, utilize the selected a part of load-bearing pillar 1 of Architectural Mechanics knowledge as destroying object at first according to the stress system and the desired results collapse direction of structure.
These pillars 1 are removed the concrete cover of capitals and post basal cross section earlier, reinforcing bar is come out,, and section is done insulation with epoxy resin etc. handle, make the reinforcing bar in these posts only have electrical connectivity in inside then with these bars cutting.
Hole at diverse location place in the vertical and definite cross section of pillar respectively according to the layout rules of aforementioned extrapolation reinforcing bar then, the plain bar 9 of insertion and hole equivalent diameter, the position of these extrapolation reinforcing bars 9 should be close to vertical muscle 2, and has electrical connectivity with it.In order to guarantee extrapolation reinforcing bar 9 and concrete tight the contact, can before inserting, it make its surface be stained with cement mortar, and extrapolation reinforcing bar 9 is closely contacted with original concrete, the bulking effect of reinforcing bar is given full play to.
With lead 3 a certain vertical internal rod 2 is linked to each other with the anode 5 of Constant Direct Current power supply 4.Select a certain size zone on the pillar surface; concrete cover that earlier should the zone chisels out a part; reduce protective layer thickness; smear conductive coating 6 (pitch adds graphite, spray zinc layer etc.) at concrete surface then; in this zone, keep at a certain distance away subsequently; bury piece of stainless steel or copper sheet 7 underground as negative electrode, link to each other with the negative electrode 8 of dc source 4.So just make every selected post all form a loop with dc source 4.
Simultaneously on each selected post 1 top near the position of the capital circle iron chains that is fastened, and iron chains linked to each other with motor at a distance.
Start each dc source, make the reinforcing bar in each selected post that corrosion take place to quicken.According to field observation, when pillar occurs closing on the sign of destruction, close each dc source, starter motor applies the side direction pulling force for simultaneously each post by iron chains, and each post is destroyed simultaneously, and structure is collapsed towards predetermined direction.Clear up remaining member with machineries such as crane or manpower subsequently, remove building fully.
1) example 1: remove multispan multi-layer concrete structure
Certain six story frame structure residential building, the post network arrangements as shown in Figure 2.
(1) the selected post that destroys: so that structural entity is collapsed southwards is example, and seven posts in selected bottom column net southern side are for destroying post.
(2) regional A, B, C, the D that equates in vertical selected 4 spacings of every selected post, in each position with the protective layer thickness of twice serve as vertical interval each determine that 3 cross sections arrange extrapolation reinforcing bar 9, as shown in Figure 3.
(3) in these 12 cross sections,, arrange extrapolation reinforcing bar 9 in the two side areas of next-door neighbour's central longitudinal muscle, as shown in Figure 4 along long side direction.Wherein, for these 12 cross sections of No. 2 and No. 6 posts, according to calculating the two-way extrapolation reinforcing bar 9 of needs layout in each cross section, as shown in Figure 5.
(4) energising, the starter motor that is undertaken each post by preceding method provides operations such as pulling force, and each post is destroyed simultaneously, and structure is collapsed to predetermined direction.
2) example 2: remove the single span sandwich construction
(1) make the structural entity fall in: as shown in Figure 6, the six roots of sensation post of selected bottom column net inside is for destroying post, make its damage inactivation after, structural entity is with fall in.
(2) make structure left (right side) side collapse: as shown in Figure 6, five posts of a selected bottom column net left side (right side) side one row are for destroying post, the same its damage inactivation that makes, can make structure left (right side) side collapse.
Claims (9)
1. the electrifying dismounting method of a steel reinforced concrete structure building is characterized in that, specifically comprises the steps:
1., choose the interior some pillars of structure as destroying object, make the reinforcing bar in these posts that corrosion take place to quicken, the principle that these pillars are chosen is the slump that their destruction will cause total, and the selection to the destruction post of diverse location makes structure collapse towards different directions;
2., choose destroy post after, each pillar is carried out following processing: bar cutting face is done insulation handle, in the pillar internal drilling, insert plain bar with the hole equivalent diameter, piece of stainless steel or copper sheet are linked to each other with the negative electrode of dc source, form the loop, pillar twines a circle with iron chains and iron chains is linked to each other with motor;
3., start each dc source, make the quick corrosion of reinforcing bar in these selected posts;
4., close each power supply, starter motor applies the side direction pulling force for each post.
2. the electrifying dismounting method of steel reinforced concrete structure building according to claim 1, it is characterized in that, describedly bar cutting face is done insulation handle, be meant: elder generation is with the bar cutting at capital in these posts and post basal cross section place, and bar cutting face is done insulation handle, make reinforcing bar and outside reinforcing bar in this post no longer have electrical connectivity.
3. the electrifying dismounting method of steel reinforced concrete structure building according to claim 1, it is characterized in that, the plain bar of described insertion and hole equivalent diameter, be meant: in order to strengthen the influence degree of corrosion of steel bar the pillar bearing capacity, guarantee that in post pillar can destroy after the abundant corrosion of reinforcing bar, diverse location place boring in pillar, insert plain bar then with the hole equivalent diameter, these extrapolation reinforcing bars closely contact with vertical muscle, therefore after energising, corrosion takes place in the extrapolation reinforcing bar in the post, vertical muscle and stirrup together.
4. the electrifying dismounting method of steel reinforced concrete structure building according to claim 1 is characterized in that, the plain bar of described insertion and hole equivalent diameter, and its position is determined by the following method:
1. vertical at pillar: from top to bottom with selected several zones of the spacing that equates, serve as vertical interval in zone, every place with the protective layer thickness of twice along the pillar short transverse, and each determines that 3 pillar cross sections arrange the extrapolation reinforcing bar;
2. in determining the pillar cross section: along the long side direction in pillar cross section, arrange the extrapolation reinforcing bar, run through the pillar cross section in the both sides immediate area of the vertical muscle of middle institute cloth.
5. the electrifying dismounting method of steel reinforced concrete structure building according to claim 1, it is characterized in that, described piece of stainless steel or copper sheet are linked to each other with the negative electrode of dc source, form the loop, be meant: a certain reinforcing bar that will select post links to each other with the anode of external direct current power supply, smear pitch simultaneously in the selected zone of exterior posts and add graphite or spray zinc layer conductive coating, in coating, bury piece of stainless steel or copper sheet underground, then piece of stainless steel or copper sheet are linked to each other with the negative electrode of dc source, form the loop.
6. the electrifying dismounting method of steel reinforced concrete structure building according to claim 1, it is characterized in that, describedly twine a circle and link to each other, be meant: near the position of the capital circle iron chains that is fastened, then the motor of iron chains with the distant place linked to each other on pillar top with motor with iron chains.
7. the electrifying dismounting method of steel reinforced concrete structure building according to claim 1, it is characterized in that, each dc source of described startup, be meant: start the dc source that each links to each other with selected post, and, make the corrosion degree of each selected post keep synchronous substantially by controlling the size of current in each loop.
8. the electrifying dismounting method of steel reinforced concrete structure building according to claim 1 is characterized in that, described each power supply of closing is meant: according to field observation, when pillar occurs closing on the sign of destruction, close each dc source.
9. the electrifying dismounting method of steel reinforced concrete structure building according to claim 1, it is characterized in that described each post of giving applies the side direction pulling force, is meant: motor applies a side direction pulling force for simultaneously each post by iron chains, each post is destroyed, and structure is collapsed towards predetermined direction.
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| CNB2006101172797A CN100370107C (en) | 2006-10-19 | 2006-10-19 | Electrifying dismounting method for steel reinforced concrete structure building |
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| CNB2006101172797A CN100370107C (en) | 2006-10-19 | 2006-10-19 | Electrifying dismounting method for steel reinforced concrete structure building |
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| CN100370107C true CN100370107C (en) | 2008-02-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024014004A1 (en) * | 2022-07-15 | 2024-01-18 | 日本電信電話株式会社 | Peeling device, peeling method, and program |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104153597B (en) * | 2014-07-18 | 2016-08-24 | 张振堂 | A kind of low floor building demolition method |
| CN106907020B (en) * | 2017-04-14 | 2022-06-14 | 金陵科技学院 | Recycling machine for building |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256649A (en) * | 1996-03-18 | 1997-09-30 | Kumagai Gumi Co Ltd | Disassembling method for reinforcing concrete structure |
| CN1224479A (en) * | 1996-12-27 | 1999-07-28 | 日立造船株式会社 | Discharge impact breaking device |
| JPH11264292A (en) * | 1998-03-19 | 1999-09-28 | Ishikawajima Harima Heavy Ind Co Ltd | Continuous breaking system by electric energy |
| JPH11324348A (en) * | 1998-05-13 | 1999-11-26 | Nippon Boshoku Kogyo Kk | Destructing method |
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2006
- 2006-10-19 CN CNB2006101172797A patent/CN100370107C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256649A (en) * | 1996-03-18 | 1997-09-30 | Kumagai Gumi Co Ltd | Disassembling method for reinforcing concrete structure |
| CN1224479A (en) * | 1996-12-27 | 1999-07-28 | 日立造船株式会社 | Discharge impact breaking device |
| JPH11264292A (en) * | 1998-03-19 | 1999-09-28 | Ishikawajima Harima Heavy Ind Co Ltd | Continuous breaking system by electric energy |
| JPH11324348A (en) * | 1998-05-13 | 1999-11-26 | Nippon Boshoku Kogyo Kk | Destructing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024014004A1 (en) * | 2022-07-15 | 2024-01-18 | 日本電信電話株式会社 | Peeling device, peeling method, and program |
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