CN108613602A - A kind of blasting demolishing method of Structure in Complex Structure prestressed girder - Google Patents
A kind of blasting demolishing method of Structure in Complex Structure prestressed girder Download PDFInfo
- Publication number
- CN108613602A CN108613602A CN201810381026.3A CN201810381026A CN108613602A CN 108613602 A CN108613602 A CN 108613602A CN 201810381026 A CN201810381026 A CN 201810381026A CN 108613602 A CN108613602 A CN 108613602A
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- CN
- China
- Prior art keywords
- prestressed girder
- building
- prestressed
- girder
- blasthole
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
Abstract
The present invention relates to technical field of building construction, in particular to a kind of blasting demolishing method of Structure in Complex Structure prestressed girder.Include the following steps：1), the ultimate tensile strength of calculated prestressing force beam, is drilled with blasthole on prestressed girder, and the explosive that can destroy prestressed girder structural stability is buried into blasthole；2), blow-up point is arranged on the structures above and below prestressed girder；3) blow-up point in building structure, is ignited successively, until all structures collapse completely.The present invention has the characteristics that reasonable design, safe and reliable, easy construction, is suitable for the demolition blasting of various labyrinth building prestressed girders.
Description
Technical field
The present invention relates to technical field of building construction, in particular to a kind of demolition blasting of Structure in Complex Structure prestressed girder
Method.
Background technology
So far from early 1980s, prestressing technique obtains unprecedented great development, prestressed reinforced concrete construction
Using appearing in the engineerings such as Super High, super-span, ultra-large volume, overlength and large area, overweight load.Post tentioned prestressed concrete girder
It is to penetrate presstressed reinforcing steel in reserving hole channel after concrete members reach defined intensity and carry out tensioning, recycle anchorage
Presstressed reinforcing steel after tensioning is anchored at the end of component, transmits the prestressing force of presstressed reinforcing steel by the anchorage of component ends
To concrete component, it is made to generate compressive pre-stress.
In recent years, it is torn open due to building the explosion that the needs such as water conservancy projects, highway broadening have complicated prestress architecture structure
It removes.Traditional building structure demolition blasting generally uses single main support failure mode, its structural instability, disintegration is made to collapse,
But the features such as prestressed girder inside building structure is because of its stress release, high intensity causes it to disintegrate difficult, especially prestressing force
Presstressed reinforcing steel in beam is difficult to use conventional method and is destroyed, conventional method can also influence building structure total Collapse effect and
Safety.
Invention content
Present invention aim to solve the existing blasting demolishing method that above-mentioned background technology is mentioned to be applied to have pre- answer
The building of power beam there are problems that disintegrating it is difficult, be difficult to destroy and influence is collapsed effect, it is pre- to provide a kind of Structure in Complex Structure
The blasting demolishing method of stress beam.
The technical scheme is that：A kind of blasting demolishing method of Structure in Complex Structure prestressed girder, it is characterised in that：
Include the following steps：
1), the ultimate tensile strength of calculated prestressing force beam, is drilled with blasthole on prestressed girder, and being buried into blasthole can break
The explosive of bad prestressed girder structural stability；
2), cloth on the top building on being carried on prestressed girder and the lower section building being supported in below prestressed girder
Set blow-up point；
3) blow-up point in building structure, is ignited successively, until all structures collapse completely.
In the further step 1), the method that blasthole is drilled on prestressed girder is：It is grown along it in prestressed girder
It spends at the center in direction and is drilled with blasthole.
The further blasthole is the vertical drilling hole from top to bottom extending into prestressed girder.
The further blasthole does not penetrate through prestressed girder vertically.
The further blasthole is located at the surface of prestressed girder bosom emptying aperture.
The further explosive is dose control can form vertical notch destruction prestressing force on prestressed girder
Girder construction stability but not the emulsion for causing prestressed girder to collapse immediately.
In the further step 3, the method for igniting the blow-up point in building structure successively is：Top is first ignited to build
The blow-up point on object is built, after forming the notch for destroying top building, then ignites the blow-up point on prestressed girder, it is pre- to form destruction
The notch of stress beam structural stability finally ignites the blow-up point on the building of lower section, forms the notch for destroying lower section building.
Advantages of the present invention has：1, by arranging that blow-up point destroys the structural stability of prestressed girder on prestressed girder,
The intensity that entire prestressed girder is reduced during structure demolition, forces prestressed girder to collapse in blasting process and building
It is disintegrated completely in journey, improves the efficiency of entire demolition blasting, solve the problems, such as that prestressed girder is difficult to disintegrate.
2, it by arranging blow-up point in prestressed girder centre position, is formed on prestressed girder and destroys its structural stability
Notch does not need to actually completely destroy prestressed girder, therefore explosive dose is small, at low cost, and blasthole is drilled with more simple
It is single, the difficulty of entire blast working will not be increased.
3, fall the structural stability of prestressed girder by premature degradation, top building collapse generation gravity destroy it is pre-
The structure of stress beam completes Demolition Construction, had not only reduced explosive dose, but also not will produce the security risk of blast products splashing,
Improve the safety of prestressed girder demolishing buildings construction.
4, reasonable design, securely and reliably, according to the distribution situation of prestress anchorage cable reinforcing bar, calculated prestressing force when demolition blasting
The ultimate tensile strength of beam, choosing rational blasting method makes the reduction of prestressed girder ultimate strength, reaches unstable failure level, protects
The safe slow release of prestressing force inside prestressed girder has been demonstrate,proved, while having also ensured the explosion of top building and lower section building
Effect.
2, easy to operate, the method for the invention is easy to operate, simplifies Structure in Complex Structure prestressed girder demolition blasting
Construction technology, reduce the difficulty of construction of blasting and dismantling engineering, greatly improve work efficiency.
Therefore, the present invention has the characteristics that reasonable design, safe and reliable, easy construction, is built suitable for various labyrinths
Build the demolition blasting of object prestressed girder.
Description of the drawings
Fig. 1：The complex building structural schematic diagram of the embodiment of the present invention；
Fig. 2：Steel for shot structural schematic diagram on the prestressed girder of the present invention；
Wherein：1-top building；2-prestressed girders；3-lower section buildings；4-prestress anchorage cable reinforcing bars；5-big guns
Hole；6-emptying apertures.
Specific implementation mode
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
Certain building be reorganization and expansion for several times form, overall structure is extremely complex, earliest be four layers of brick-concrete building, after increase
It it is ten layers, six layers of top is frame structure, has prestressed girder interlayer, such as Fig. 1 between mixed five layers of the upper frame structure therewith of four layers of brick
It is shown.
As shown in Figure 1, i.e. the lower section building 3 of the present embodiment be four layers of brick-concrete building, prestressed girder 2 be four layers with
Support beam body between five layers, is post-stress beam, and top building 1 is six story frame structures.
Practical demolition blasting work is as follows：
Step 1: survey calculation needs the length L=18m, vertical height H=2m, width B of the prestressed girder 2 of demolition blasting
=0.6m, gravitational load Q=1.93 × 10 that prestressed girder 2 carries6kg.2 inside anchor cable reinforcing bar 4 of prestressed girder is distributed 3 group 6
Beam chooses rational blasting method shape on prestressed girder 2 according to the ultimate tensile strength of these parameter calculated prestressing force beams 2
At the notch for destroying 2 structural stability of prestressed girder, the vertical height of the notch is l=80cm.
Step 2: as shown in Fig. 2, in the prestressed girder 2 for being embedded with more prestress anchorage cable reinforcing bars 4 along its length
Centre position is drilled with multiple blastholes 5, and multiple blastholes 5 from top to bottom extend in prestressed girder 2, but do not pass through in the vertical direction
Rational hole depth h=60cm, pitch-row a is arranged by the technology requirement that 2 ultimate tensile strength of prestressed girder is destroyed in logical prestressed girder 2
=40cm, single hole explosive payload are filled according to 2.88kg, select emulsion.
Step 3: when building structure demolition blasting, setting 2 burst time of prestressed girder is 1 blasting cut of top building
After formation, before building 3 blasting cut in lower section formed, it is ensured that before building structure slump, the unstability of prestressed girder 2 is answered in advance
The explosion of power beam 2 actually only destroys the structural stability of prestressed girder 2, will not directly contribute collapsing for prestressed girder 2, directly
After collapsing to top building 1, total under the effect of gravity destroys prestressed girder 2 completely, causes whole building
Disintegration and failure, in this way reduce slump vibration effect.
The prestressed girder 2 of the present embodiment is located at the middle layer position of Structure in Complex Structure, the direct shadow of blasting demolishing method
Ring the demolition effect of top building 1 and lower section building 3.
The blasthole 5 of the present embodiment is located at the surface of rectangle emptying aperture 6 in prestressed girder 2, and emptying aperture 6 is for installing ventilation duct
Road is located at the centre position of prestressed girder 2.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent defines.
Claims (7)
1. a kind of blasting demolishing method of Structure in Complex Structure prestressed girder, it is characterised in that：Include the following steps：
1), the ultimate tensile strength of calculated prestressing force beam (2) is drilled with blasthole (5) on prestressed girder (2), is buried into blasthole (5)
If the explosive of prestressed girder (2) structural stability can be destroyed；
2), the top building (1) on being carried on prestressed girder (2) and the lower section building being supported in below prestressed girder (2)
Object arranges blow-up point on (3)；
3) blow-up point in building structure, is ignited successively, until all structures collapse completely.
2. a kind of blasting demolishing method of Structure in Complex Structure prestressed girder as described in claim 1, it is characterised in that：It is described
Step 1) in, the method that blasthole (5) is drilled on prestressed girder (2) is：At the center of prestressed girder (2) along its length
Place is drilled with blasthole (5).
3. a kind of blasting demolishing method of Structure in Complex Structure prestressed girder as claimed in claim 2, it is characterised in that：It is described
Blasthole (5) be the vertical drilling hole from top to bottom extending into prestressed girder (2).
4. a kind of blasting demolishing method of Structure in Complex Structure prestressed girder as claimed in claim 3, it is characterised in that：It is described
Blasthole (5) do not penetrate through prestressed girder (2) vertically.
5. a kind of blasting demolishing method of Structure in Complex Structure prestressed girder as claimed in claim 4, it is characterised in that：It is described
Blasthole (5) be located at the surface of prestressed girder (2) bosom emptying aperture (7).
6. a kind of blasting demolishing method of Structure in Complex Structure prestressed girder as described in claim 1, it is characterised in that：It is described
Explosive be dose control can be formed on prestressed girder (2) vertical notch destroy prestressed girder (2) structural stability but
The emulsion that prestressed girder (2) will not be caused to collapse immediately.
7. a kind of blasting demolishing method of Structure in Complex Structure prestressed girder as described in claim 1, it is characterised in that：It is described
Step 3 in, the method for blow-up point ignited successively in building structure is：First ignite the blow-up point on top building (1), shape
After destroying the notch of top building (1), then the blow-up point on prestressed girder (2) is ignited, is formed and destroy prestressed girder (2) knot
The notch of structure stability finally ignites the blow-up point on lower section building (3), forms the notch for destroying lower section building (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810381026.3A CN108613602A (en) | 2018-04-25 | 2018-04-25 | A kind of blasting demolishing method of Structure in Complex Structure prestressed girder |
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| CN201810381026.3A CN108613602A (en) | 2018-04-25 | 2018-04-25 | A kind of blasting demolishing method of Structure in Complex Structure prestressed girder |
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| CN108613602A true CN108613602A (en) | 2018-10-02 |
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| CN201810381026.3A Pending CN108613602A (en) | 2018-04-25 | 2018-04-25 | A kind of blasting demolishing method of Structure in Complex Structure prestressed girder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111537258A (en) * | 2020-05-22 | 2020-08-14 | 中国水利水电第十六工程局有限公司 | Dam concrete prestress anchor cable blasting demolition sampling method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839610A (en) * | 2012-09-17 | 2012-12-26 | 贵州新联爆破工程有限公司 | Demolition blasting method for prestress concrete cantilever trussed arch bridge |
| CN104775367A (en) * | 2015-02-07 | 2015-07-15 | 河南理工大学 | Method for blasting demolition of bridge in urban area by controlling stepping-type sequential collapse |
-
2018
- 2018-04-25 CN CN201810381026.3A patent/CN108613602A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839610A (en) * | 2012-09-17 | 2012-12-26 | 贵州新联爆破工程有限公司 | Demolition blasting method for prestress concrete cantilever trussed arch bridge |
| CN104775367A (en) * | 2015-02-07 | 2015-07-15 | 河南理工大学 | Method for blasting demolition of bridge in urban area by controlling stepping-type sequential collapse |
Non-Patent Citations (1)
| Title |
|---|
| 蒙云琪等: "基于数值模拟的铁四院前大楼拆除爆破方案优化", 《爆破》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111537258A (en) * | 2020-05-22 | 2020-08-14 | 中国水利水电第十六工程局有限公司 | Dam concrete prestress anchor cable blasting demolition sampling method |
| CN111537258B (en) * | 2020-05-22 | 2022-07-15 | 中国水利水电第十六工程局有限公司 | Dam concrete prestress anchor cable blasting demolition sampling method |
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Application publication date: 20181002 |