CN102839610A - Demolition blasting method for prestress concrete cantilever trussed arch bridge - Google Patents
Demolition blasting method for prestress concrete cantilever trussed arch bridge Download PDFInfo
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- CN102839610A CN102839610A CN2012103412269A CN201210341226A CN102839610A CN 102839610 A CN102839610 A CN 102839610A CN 2012103412269 A CN2012103412269 A CN 2012103412269A CN 201210341226 A CN201210341226 A CN 201210341226A CN 102839610 A CN102839610 A CN 102839610A
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Abstract
The invention discloses a demolition blasting method for a prestress concrete cantilever trussed arch bridge. The demolition blasting method comprises the following steps: an energy-gathering line cutting blasting method is adopted; firstly, all prestress anchor cable reinforcing steel bars and lower chord girder reinforcing steel bars in a main hole pin section on the main arch of the bridge are cut at the same time; the dose of the thread-loaded explosive of an energy-gathering explosive bag for cutting the pre-stress anchor cable reinforcing steel bars is 40g/cm; a multi-point water pressure blasting method is adopted for demolishing supporting stand columns and arch support stand columns on the piers of the bridge and a hollow body of an edge hole steel structure beam; water pressure explosive bag groups are arranged according to the required positions and heights of cutting openings based on the bridge collapse technology; and the arch top of the bridge and a solid body section between the two edge hole steel structure beams close to a bridge abutment are demolished by a drilling blasting method. By virtue of the above method, the steel structure beam, the arch support stand columns and the plier stand columns are completely demolished, the concrete is crashed and separated, and the bridge is collapsed in an unstable state.
Description
Technical field
The present invention relates to the demolition blasting method of highway bridge, the particularly blasting demolishing method of prestressed concrete cantilever truss arch bridge.
Background technology
Prestressed concrete cantilever truss arch bridge is the new structure bridge that grows up the eighties in 20th century; The force-bearing situation of the full structure of this class formation bridge is superior to encircleing the purlin bridge; Have the big characteristics of span; Be one of main developing direction of Longspan Bridge, in recent years, needs such as widen and exist in a large number these type of structural bridges to remove owing to build water conservancy projects, highway.Traditional bridge demolition blasting is general to adopt single shallow blasting, hydraulic pressure demolition or cumulative cutting explosion to remove; But prestressed reinforced concrete cantilever truss arch bridge is a combining structure; Member is box structure mostly; Wall is thin, adopts simple boring or multiple spot hydraulic pressure demolition scheme can not realize design idea fully, adopts cumulative line cutting blasting scheme cost higher fully.
Summary of the invention
In order to improve defective and the deficiency in the above-mentioned prestressed concrete cantilever truss arch bridge demolition blasting process, passed through a large amount of engineering practices, the present invention proposes a kind of practical approach reasonable in design, easy and simple to handle.
The technical scheme that the present invention adopts: a kind of prestressed concrete cantilever truss arch bridge blasting demolishing method comprises following operating procedure:
(1) adopt cumulative line cutting blasting method, at first all prestress anchorage cable reinforcing bars on the bridge main arch and main aperture pin section lower edge purlin sheet reinforcing bar are cut off simultaneously, its wire-bound dose of cumulative cartridge bag that cuts off the prestress anchorage cable reinforcing bar is 40g/cm, selects the hexogen explosive for use;
(2) to the support post on the bridge pier of bridge and abut column and the lateral opening beam body employing multiple spot hydraulic pressure demolition method on an empty stomach of just having purchased; Control water coupling cartridge bag damage envelope by water filling height or length, required incision site, the height placement hydraulic pressure cartridge bag crowd of technical requirements of caving in by pontic; Multiple spot hydraulic pressure demolition dose can be by momentum criterion formulas Q=K δ
1.6R
1.4Calculate, select emulsion for use;
(3) adopt destroy a bridge vault and close on the real abdomen section between two lateral opening firm structure beams of abutment of drilling and blasting method, drilling depth is got 2/3 of the position thickness δ that bores; Adjacent two explosion distance between borehole a are: 30-40cm between adjacent two explosive holes apart from b is: 20-30cm, and the explosive consumption q of every cube of steel concrete gets 1.5kg/m3, and the explosive payload in every hole can be calculated by Q=qab δ, selects emulsion for use.
Adopt said method; Prestressed concrete cantilever truss arch bridge is under the comprehensive blast action that the explosion of cumulative linear incision, multiple spot hydraulic pressure demolition and drilling and blasting combine, and lateral opening firm structure beam, abut and pier column disintegrate fully, and cage is taken off in the concrete fragmentation; Pontic slump under instability status; Relying on deadweight to fall, secondly is to disintegrate to want fully to be beneficial to follow-up clear quarrel work.
The specific embodiment
It is domestic that Bijie naturalization bridge is positioned at naturalization village, Bijie City, Guizhou Province, is the important highway bridge on the expensive complete high-grade highway, was open to the traffic in 1994; Because unsound at bridge construction stage supervision mechanism, quality is not effectively guaranteed, has buried serious hidden danger of quality; And it is rapid when design, not expect economic development; Vehicle flowrate is very big, and overload, overrun vehicle is a lot, causes this bridge just to need demolition blasting less than the length of service.
(1) adopts cumulative line cutting blasting method; At first all prestress anchorage cable reinforcing bars on the bridge main arch and main aperture pin section lower edge purlin sheet reinforcing bar are cut off simultaneously; Its wire-bound dose of flexible linear-shaped charge bag that cuts off the prestress anchorage cable reinforcing bar is 40g/cm; Select the hexogen explosive for use, the huge tension basis that produces when avoiding main arch to cave in like this;
(2) to the support post on the bridge pier of bridge and abut column and the lateral opening beam body employing multiple spot hydraulic pressure demolition method on an empty stomach of just having purchased; Control water coupling cartridge bag damage envelope by water filling height or length, required incision site, the height placement hydraulic pressure cartridge bag crowd of technical requirements of caving in by pontic; Multiple spot hydraulic pressure demolition dose can be by momentum criterion formulas Q=K δ
1.6R
1.4Calculate, δ is the wall thickness of works in the formula; R is the internal diameter of works, is the half the of minor face for rectangular configuration; K is that coefficient gets 10, arranges that the number of plies of cartridge bag is arranged according to the height of required destruction, and the distance between every layer of blasting charge is 0.5m, selects emulsion for use;
(3) adopt destroy a bridge vault and close on the real abdomen section between two lateral opening firm structure beams of abutment of drilling and blasting method, drilling depth is got 2/3 of the position thickness δ that bores; Adjacent two explosion distance between borehole a are: 30-40cm between adjacent two explosive holes apart from b is: 20-30cm, and the explosive consumption q of every cube of steel concrete gets 1.5kg/m3, and the explosive payload in every hole can be calculated by Q=qab δ, selects emulsion for use.
Claims (1)
1. prestressed concrete cantilever truss arch bridge blasting demolishing method is characterized in that comprising following operating procedure:
(1) adopt cumulative line cutting blasting method, at first all prestress anchorage cable reinforcing bars on the bridge main arch and main aperture pin section lower edge purlin sheet reinforcing bar are cut off simultaneously, its wire-bound dose of cumulative cartridge bag that cuts off the prestress anchorage cable reinforcing bar is 40g/cm, selects the hexogen explosive for use;
(2) to the support post on the bridge pier of bridge and abut column and the lateral opening beam body employing multiple spot hydraulic pressure demolition method on an empty stomach of just having purchased; Control water coupling cartridge bag damage envelope by water filling height or length, required incision site, the height placement hydraulic pressure cartridge bag crowd of technical requirements of caving in by pontic; Multiple spot hydraulic pressure demolition dose can be by momentum criterion formulas Q=K δ
1.6R
1.4Calculate, select emulsion for use;
(3) adopt destroy a bridge vault and close on the real abdomen section between two lateral opening firm structure beams of abutment of drilling and blasting method, drilling depth is got 2/3 of the position thickness δ that bores; Adjacent two explosion distance between borehole a are: 30-40cm between adjacent two explosive holes apart from b is: 20-30cm, and the explosive consumption q of every cube of steel concrete gets 1.5kg/m3, and the explosive payload in every hole can be calculated by Q=qab δ, selects emulsion for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012103412269A CN102839610A (en) | 2012-09-17 | 2012-09-17 | Demolition blasting method for prestress concrete cantilever trussed arch bridge |
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| CN2012103412269A CN102839610A (en) | 2012-09-17 | 2012-09-17 | Demolition blasting method for prestress concrete cantilever trussed arch bridge |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104790303A (en) * | 2015-04-30 | 2015-07-22 | 青岛第一市政工程有限公司 | Water-pressure blasting demolition technology for box bridge |
| CN104930936A (en) * | 2015-06-24 | 2015-09-23 | 中交一公局第五工程有限公司 | Rapid controlled blasting demolition method for arch-shaped highway over-line bridge |
| CN105088979A (en) * | 2015-09-04 | 2015-11-25 | 贵州新联***工程集团有限公司 | Demolition blasting method for large bridge |
| CN105571418A (en) * | 2016-02-23 | 2016-05-11 | 程大春 | Water-coupled charging blasting demolition method for reinforced concrete beam or column |
| CN105648931A (en) * | 2015-12-31 | 2016-06-08 | 中铁二局集团有限公司 | Blasting method of separated type overpass |
| CN108583815A (en) * | 2018-04-24 | 2018-09-28 | 西京学院 | A kind of seabed vacuum pipe and lifesaving escaping method considering lifesaving escaping |
| CN108613602A (en) * | 2018-04-25 | 2018-10-02 | 中铁四院集团岩土工程有限责任公司 | A kind of blasting demolishing method of Structure in Complex Structure prestressed girder |
| CN109269367A (en) * | 2018-10-19 | 2019-01-25 | 洛阳理工学院 | It is a kind of to exempt from punching construction method for reinforced concrete frame structure demolition blasting |
| CN110984002A (en) * | 2020-01-17 | 2020-04-10 | 广东冠粤路桥有限公司 | Bridge deck auxiliary structure and method for dismantling cantilever box girder of main bridge T-shaped structure |
| CN111485569A (en) * | 2020-04-24 | 2020-08-04 | 中交路桥建设有限公司 | Method for removing temporary bearing platform in water by blasting method |
| CN111551088A (en) * | 2020-05-12 | 2020-08-18 | 中钢集团武汉安全环保研究院有限公司 | Accurate blasting demolition method for single-tower single-cable-plane prestressed cable-stayed bridge |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104790303A (en) * | 2015-04-30 | 2015-07-22 | 青岛第一市政工程有限公司 | Water-pressure blasting demolition technology for box bridge |
| CN104930936B (en) * | 2015-06-24 | 2016-05-04 | 中交一公局第五工程有限公司 | Highway arch form line bridge controlled blasting fast dismantling eliminating method |
| CN104930936A (en) * | 2015-06-24 | 2015-09-23 | 中交一公局第五工程有限公司 | Rapid controlled blasting demolition method for arch-shaped highway over-line bridge |
| CN105088979B (en) * | 2015-09-04 | 2017-03-22 | 贵州新联***工程集团有限公司 | Demolition blasting method for large bridge |
| CN105088979A (en) * | 2015-09-04 | 2015-11-25 | 贵州新联***工程集团有限公司 | Demolition blasting method for large bridge |
| CN105648931A (en) * | 2015-12-31 | 2016-06-08 | 中铁二局集团有限公司 | Blasting method of separated type overpass |
| CN105571418A (en) * | 2016-02-23 | 2016-05-11 | 程大春 | Water-coupled charging blasting demolition method for reinforced concrete beam or column |
| CN105571418B (en) * | 2016-02-23 | 2018-01-16 | 程大春 | Reinforced beam or post water coupling blasting demolishing method |
| CN108583815A (en) * | 2018-04-24 | 2018-09-28 | 西京学院 | A kind of seabed vacuum pipe and lifesaving escaping method considering lifesaving escaping |
| CN108613602A (en) * | 2018-04-25 | 2018-10-02 | 中铁四院集团岩土工程有限责任公司 | A kind of blasting demolishing method of Structure in Complex Structure prestressed girder |
| CN109269367A (en) * | 2018-10-19 | 2019-01-25 | 洛阳理工学院 | It is a kind of to exempt from punching construction method for reinforced concrete frame structure demolition blasting |
| CN109269367B (en) * | 2018-10-19 | 2020-06-05 | 洛阳理工学院 | Punching-free construction method for blasting demolition of reinforced concrete frame structure |
| CN110984002A (en) * | 2020-01-17 | 2020-04-10 | 广东冠粤路桥有限公司 | Bridge deck auxiliary structure and method for dismantling cantilever box girder of main bridge T-shaped structure |
| CN111485569A (en) * | 2020-04-24 | 2020-08-04 | 中交路桥建设有限公司 | Method for removing temporary bearing platform in water by blasting method |
| CN111551088A (en) * | 2020-05-12 | 2020-08-18 | 中钢集团武汉安全环保研究院有限公司 | Accurate blasting demolition method for single-tower single-cable-plane prestressed cable-stayed bridge |
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Application publication date: 20121226 |