CN108005055B - A kind of soft soil foundation burst point cavitation dynamic compaction method and its complexes - Google Patents
A kind of soft soil foundation burst point cavitation dynamic compaction method and its complexes Download PDFInfo
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- CN108005055B CN108005055B CN201711245936.0A CN201711245936A CN108005055B CN 108005055 B CN108005055 B CN 108005055B CN 201711245936 A CN201711245936 A CN 201711245936A CN 108005055 B CN108005055 B CN 108005055B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
- F42D1/045—Arrangements for electric ignition
-
- 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)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
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Abstract
The invention discloses a kind of soft soil foundation burst point cavitation dynamic compaction methods, continuous cavity is generated inside saturated soft soil using drillhole blasting, Soft Soil Layer is rammed with blunt nosed abnormal shape weight bell high-energy with special in explosion elementary errors time-histories, blunt nosed front end is set to generate vacuole by the liquefaction of soil mass that explosion generates, then under blasting impact and blunt nosed impact double action, cavitation is formed in the saturation soil body, weight energy is promoted deeply to run through stratum.Metaling is filled in the cavity to be formed in time ramming, forms dynamic replacement layer, then secondary multiple rammer is carried out with common hammer, rams effect and compacted depth to greatly improve, improve construction efficiency.A kind of explosion strong rammer linkage is also disclosed, the above method can be preferably applicable in and explosion strong rammer is carried out to soft soil foundation.
Description
Technical field
The present invention relates to construction engineering technical field, in particular to a kind of soft soil foundation burst point cavitation dynamic compaction method and its at
Covering device.
Background technique
There are a large amount of muddy soft soils for the southeastern coastal areas, and moisture content is high, and soil property is weak, these soils are built as engineering
It is long in time limit needed for common piling prepressing or vacuum preloading draining concretion method if having to pass through basement process before land used；Increase
When the drainage channels such as plastic draining board, and frequent silting, cause draining difficult, effect is also bad.It is adopted in foundation in saturated soft soil
Carrying out basement process with heavy-tamping method is a kind of common method and a kind of higher construction technology of efficiency, but this method exists
Main problem be when using it is larger ram can be carried out ram processing when, due in soft soil foundation pore water pressure accumulation, lack
Weary drainage channel, therefore be also easy to produce spongy soil, rams ineffective, and processing depth is limited.Common improved method is that strong rammer is set
Method is changed, broken stone pile or other drainage channels are first carried out by pilot hole displacement, strong rammer is then carried out again, can mention to a certain extent
Height rams effect, but speed of application is significantly affected, and reinforcement depth is still limited.
Summary of the invention
In view of the deficienciess of the prior art, the first purpose of this invention is to provide a kind of soft soil foundation burst point cavitation
Dynamic compaction method can preferably be handled muddy soft soil.
Above-mentioned technical purpose of the invention, which has the technical scheme that, to be included the following steps,
A, blast hole is bored in soft soil foundation, and the multiple emulsions of placement spaced apart in blast hole；
B, protection cylinder is installed, protection cylinder is lifted to explosion hole site, protection cylinder central alignment blast hole is made, makes it certainly
Recast is in sinking underground layer；
C, will be connected by tripping gear with crane with blunt nosed abnormal shape weight bell, and by it is special-shaped weigh bell be hung to blast hole just on
The setting height of side is provided with the arc groove being recessed inwardly on blunt nosed lower surface；
D, initiator is associated with the unhook control device above special-shaped weight bell, is set and is broken off relations according to the height of special-shaped weight bell
The time interval of time and emulsion detonation, time interval are that special-shaped weight from sling height drops down above the ground 1 meter of
The freely falling body time；Unhook is carried out to special-shaped weight and the emulsion that detonates when reaching the burst time, forms emulsion
Blasting impact preceding, abnormal shape weight bell impact achievees the effect that special-shaped weight bell follows burst point closely always, emulsion is using micro- rear
Poor millisecond blasting technology controls linkage initiator detonation by elementary errors, accurately controls and be divided between each emulsion burst time
0.1ms, firing order from the top down, to form effectively continuous cavity, promote to generate cavitation effect, abnormal shape weight bell is by detonation
It acts on and generates Cavitation effect in blast hole, effect is rammed in raising；
E, abnormal shape weight bell is hung out out of blast hole, filler is then inserted into blast hole, then extract protection cylinder；
F, common pile monkey is changed, strong rammer operation is again carried out, keeps filler closely knit, form compound foundation.
Through the above technical solutions, the surge waveform generated by explosion makes periphery Soft Soil Layer pore pressure sharply at cavity, produce
Raw liquefaction of soil mass phenomenon is goed deep into stratum for strong rammer impact and is created condition；When the liquefaction that special-shaped weight drop is formed to the burst point
When soil layer, under the double action of blasting impact and blunt nosed impact, it is existing that the front end of special-shaped weight makes the local soil body generate " vacuole "
As subsequent burst point generates short-delay blasting therewith, and vacuole constantly extends into deep soil, and special-shaped weight continues injection, reaches
The purpose of strong rammer injection.Different from common heavy-tamping method or simple short-delay blasting hole creating technology, this technology forms the soil body with explosion
Premised on cavity and liquefaction of soil, using with blunt nosed special-shaped heavy tamping Soft Soil Layer, effect is to advantageously form vacuole, is claimed
Be cavitation, due to blasting impact and the cavitation percussion formed with blunt nosed special-shaped weight, make to be saturated inside soil body
It generates apparent reaming and rams effect, tamping depth, which is significantly increased and advantageously forms, rams hole, rams effect for the first time and substantially mentions
It is high.Filler is filled in the cavity to be formed in time ramming, dynamic replacement layer can be formed, improves the intensity of soft soil foundation.It is secondary
Due to being filled with filler into blast hole before multiple rammer, drainage channel can be formed in soil layer, will not be generated in secondary rammer again
Spongy soil phenomenon rams effect and compacted depth to greatly improved.The operation of explosion strong rammer is protected in protection cylinder and sliding support
Shield is lower to be carried out, and can prevent the slungshot generated in blasting process from damaging, protection cylinder is pulled out by vibration after the completion of explosion strong rammer
Stake machine is pulled out, and to filler can also shake in withdrawal process close, the strong rammer efficiency again in later period can be improved.
Preferably, the emulsion is between 2.5~3.5 meters in the spacing in blast hole.
Preferably, filler is deposited on the outside of protection cylinder, and filler is packed into explosion by protection cylinder after extracting special-shaped weight bell
Then hole is extracted protection cylinder by lash method using vibration pile-drawing machine.
Preferably, it is characterized in that: when distance of the filler in blast hole away from explosion aperture is 3 when filler is packed into protection cylinder
Stop being packed into filler at~4 meters, continue to be packed into filler into blast hole after protection cylinder is extracted, until filler is slightly beyond explosion
Aperture reuses common column hammer and carries out secondary strong rammer to blast hole.
Preferably, four slidingtype A-frames are symmetrically arranged on the outside of protection cylinder, supplemental protective cylinder keeps stablizing.
Through the above technical solutions, the present invention having the beneficial effect that compared with the existing technology is being saturated by drillhole blasting
Continuous cavity is generated inside weak soil, generates cavity and cleavage effect, gathers periphery Soft Soil Layer pore pressure, and it is existing to generate liquefaction of soil mass
As protruding into stratum for strong rammer impact and creating conditions；With being rammed with playing the blunt nosed special-shaped weight high energy of shape in explosion elementary errors time-histories
Soft Soil Layer, when the liquefaction coating formed with blunt nosed special-shaped weight drop to the burst point of bullet shape, the blunt nosed front end for playing shape is recessed
Slot can make the local soil body generate cavitation phenomena, and subsequent burst point generates short-delay blasting therewith, and vacuole is constantly into deep soil
Extend, special-shaped weight continues injection, protrudes into weight energy through stratum, substantially increase tamping depth and construction efficiency.
Another object of the present invention with a kind of explosion strong rammer linkage is provided, the device can preferably with it is above-mentioned soft
The construction operation of soil base burst point cavitation dynamic compaction method.
A kind of explosion strong rammer linkage, including crane, tripping gear, with blunt nosed special-shaped weight, elementary errors control detonation
Device, unhook control device are realized by delay switch circuit between unhook control device and elementary errors control initiator and are linked, also wrapped
Controller is included, when controller sets the delayed ignition of delay switch circuit according to the sling height of special-shaped weight by program automatically
Between.
It is taken off between object and the time of emulsion detonation through the above technical solutions, tripping gear can be more accurately controlled
Every making special-shaped weight lower end fall on Soft Soil Layer in 0.1 millisecond after the Lithium Oxides By Detonation With Emulsion Explosive of the top, make special-shaped weight and quick-fried
The raw impact one of bankruptcy, which is worked, generates cavitation phenomena, and the impact generated with subsequent burst point cooperates, and makes vacuole constantly to life
At extending in the soil body.
Preferably, arc groove is equipped in the middle part of blunt nosed lower end.
Through the above technical solutions, arc groove can generate congregational rate to the shock wave that emulsion generates, make quick-fried
The Soft Soil Layer of liquefaction of soil mass is generated after broken, and cavitation work is formed under the double action of blasting impact and blunt nosed impact, in saturated soil body
With enabling the deep enough penetratingly layer of the energy of special-shaped weight.
Detailed description of the invention
Fig. 1 is protection cylinder in embodiment one and the structural schematic diagram after the assembly of slidingtype A-frame；
Fig. 2 is a kind of structural schematic diagram of explosion strong rammer linkage in embodiment two；
Fig. 3 is blunt nosed structural schematic diagram.
Appended drawing reference: 1, protection cylinder；2, A-frame；3, sliding slot；4, crane；5, console；6, special-shaped weight；7, it breaks off relations
Device；8, blunt nosed；9, arc groove.
Specific embodiment
With specific embodiment, the invention will be further described with reference to the accompanying drawing.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Embodiment one, a kind of soft soil foundation burst point cavitation dynamic compaction method
A kind of soft soil foundation burst point cavitation dynamic compaction method, includes the following steps,
A, brill blast hole is applied using small-sized drill in soft soil foundation, the drilling depth of blast hole is according to design reinforcement stratum
Depth exceeds 1 meter of progress operation；In the bottom of blast hole clay back cover after the completion of drilling well, then it is put into blast hole more
A emulsion, the spacing in blast hole between each emulsion are maintained between 3 meters, and in 3 meters of the hole away from blast hole
Place is sealed real with clay.
B, protection cylinder 1 is installed, whole round steel casing (as shown in Figure 1) is selected, by the lifting of protection cylinder 1 to explosion hole location
It sets, makes 1 central alignment blast hole of protection cylinder, it is made to be arranged four in Gravitative Loads sinking underground layer, and on the outside of protection cylinder 1
A sliding groove, while the A-frame 2 of four slidingtypes is set, the rectangular triangle of A-frame 2, one of A-frame 2
Right-angle side and ground face contact, another right-angle side be in sliding groove and with can be slided in sliding slot 3, supplemental protective cylinder 1 is protected
It is fixed to keep steady, 3 upper end closed of sliding slot, can be to avoid protection cylinder 1 completely into in blast hole.It is heavy that protection cylinder 1 places posterior end
Enter into blast hole, for 1 lower end of protection cylinder still in the emulsion top of the top, 1 upper end of protection cylinder remains in explosion at this time
Outside hole.Protection cylinder 1 stacks filler on the outside of protection cylinder 1 after placing, to be filled in time into blast hole after facilitating explosion, filler
Coarse aggregate, metaling etc. can be selected.Protection cylinder 1 can to avoid in blasting process slungshot damage.
C, it is in elongated cylindrical that special-shaped weight 6 is whole, and the diameter of special-shaped weight 6 is slightly less than protection cylinder 1, special-shaped 6 front end of weight
Blunt nosed the 8 of shape is played with one, is provided with the arc groove 9 (as shown in Figure 3) being recessed inwardly on blunt nosed 8 lower surface, it will be with blunt
First 8 special-shaped weight bell is connected by tripping gear 7 with crane 4, and abnormal shape weight bell is hung to the setting height right above blast hole；
D, initiator is associated with the unhook control device above special-shaped weight bell, it is set according to the height that special-shaped weight bell is hung to
Surely the time interval of unhook time and emulsion detonation.Time interval is that special-shaped weight 6 is reached from sling height freely falling body
Time above bottom surface at 1 meter.Then it is broken off relations by unhook control device to special-shaped weight 6, special-shaped weight 6 exists after unhook
It falls downwards under the action of gravity, then when 1 meter above special-shaped weight 6 reaches bottom surface, from top to down successively by initiator
Detonate the emulsion of blast hole most, and 0.1 millisecond is divided between the burst time of emulsion, different while emulsion detonation
Type weight 6 enters in blast hole and continues the blasting impact for deeply being formed, emulsion into blast hole in preceding, abnormal shape weight
Bell impact achievees the effect that special-shaped weight bell follows burst point closely always rear.Elementary errors millisecond blasting skill is used between multiple emulsions
Art controls initiator detonation by elementary errors, accurately controls and be divided into 0.1ms between each emulsion burst time, in saturated soft soil
Inside forms effectively continuous cavity, rams weak soil with 6 high-energy of special-shaped weight for playing shape blunt nosed 8 in explosion elementary errors time-histories
Layer makes blunt nosed 8 front end generate vacuole by the liquefaction of soil mass that explosion generates, in the double action of blasting impact and blunt nosed 8 impact
Under promote to generate cavitation inside saturated soft soil, enable the deep enough penetratingly layer of the energy of special-shaped weight 6.
E, abnormal shape weight bell is hung out out of blast hole, filler is then inserted into blast hole by protection cylinder 1, forms rubble
Displacement layer, filler can select coarse aggregate, metaling etc..When filler apart from blast hole eat dishes without rice or wine 3~4 meters when stop into blast hole
Fill filler, then extracted protection cylinder 1 out of blast hole using vibrating extractor, when protection cylinder 1 is extracted due to
The available close effect of certain vibration of filler in blast hole is inserted in the effect of vibration.
F, filler is continued to fill up into blast hole again after extracting protection cylinder 1, until filler is slightly above protection cylinder 1, then more
Hammer ram is changed, is hammered into shape using common column, secondary multiple rammer is carried out to filler, keeps filler closely knit, form compound foundation.Then it changes to next
Point carries out the operation of explosion strong rammer, and the ground until completing whole block is reinforced.
Embodiment two, a kind of explosion strong rammer linkage,
As shown in Figures 1 to 3, a kind of explosion strong rammer linkage, including crane 4, tripping gear 7, unhook control device, band
Blunt nosed 8 special-shaped weight 6, elementary errors controls initiator, further includes controller, controller, elementary errors control initiator are arranged at control
In platform 5 processed, controller controls the linkage between unhook control device and elementary errors control initiator.Controller is by program according to different
The sling height of type weight 6 sets the delayed ignition time automatically, and the time of delayed ignition is to fall from special-shaped weight 6 from sling height
The freely falling body time to above the ground 1 meter.Special-shaped weight 6 with blunt nosed 8 is connected by the suspension hook of tripping gear 7 and crane 4
It connects, tripping gear 7 is controlled by unhook control device, and elementary errors control initiator is controlled by the controller detonation.Tripping gear 7 can be adopted
The automatic coupling shown in Publication No. CN202265818U, unhooking rammer device, by two-way tension oil cylinder therein and loop wheel machine
Hydraulic system be connected, and use solenoid valve as unhook control device control two-way cylinder movement realize take off hook operation.
First emulsion is connect with elementary errors control initiator when use and is put into blast hole, then by special-shaped weight
6 sling, and by the height input controller of special-shaped weight 6, controller calculates special-shaped weight 6 by built-in program and falls off and detonate
The burst time of device.After the input unhook instruction into controller, controller controls electromagnetic valve work, and tripping gear 7 breaks off relations, different
Type weight 6 falls, while controller starts timing, and when controller reaches the delayed ignition time of setting, controller control is micro-
Difference control initiator detonates to the emulsion of the top in blast hole, and special-shaped weight 6 is in above bottom surface 1 meter at this time
Place, subsequent elementary errors control initiator successively detonate to the emulsion in blast hole, firing order from top to bottom, when detonation
Between between be divided into 0.1ms.
The shock wave that explosion generates can form cavity in soil layer or generate cleavage effect, make the Soft Soil Layer pore pressure on periphery
Accumulation generates liquefaction of soil mass phenomenon, when special-shaped weight 6 enters the liquefaction soil layers of burst point formation, is arranged in blunt nosed 8 lower end
The arc groove 9 in portion makes the local soil body generate cavitation phenomena, and the short-delay blasting that subsequent burst point generates therewith can make vacuole continuous
Extend into deep soil, so that special-shaped weight 6 is continued injection, achieve the purpose that strong rammer.
Above-described embodiment is only presently preferred embodiments of the present invention, is not limited the scope of the invention according to this, therefore: it is all according to
The equivalence changes that structure of the invention, shape, principle are done, should all be covered by within protection scope of the present invention.
Claims (5)
1. a kind of soft soil foundation burst point cavitation dynamic compaction method, it is characterized in that: include the following steps,
A, blast hole is bored in soft soil foundation, and the multiple emulsions of placement spaced apart in blast hole；
B, protection cylinder is installed, protection cylinder is lifted to explosion hole site, protection cylinder central alignment blast hole is made, makes it from recast
With in sinking underground layer；
C, it will be connected by tripping gear with crane with blunt nosed abnormal shape weight bell, and abnormal shape weight bell be hung to right above blast hole
Setting height is provided with the arc groove being recessed inwardly on blunt nosed lower surface；
D, initiator is associated with the unhook control device above special-shaped weight bell, is broken off relations the time according to the height setting of special-shaped weight bell
With the time interval of emulsion detonation, time interval is the freedom that special-shaped weight drops down above the ground 1 meter of from sling height
The falling bodies time；Unhook is carried out to special-shaped weight and the emulsion that detonates when reaching the burst time, forms emulsion quick-fried
Preceding, abnormal shape weight bell impact achievees the effect that special-shaped weight bell follows burst point closely always, emulsion is using elementary errors milli rear for broken impact
Second blasting technique controls linkage initiator detonation by elementary errors, accurately controls and is divided into 0.1ms between each emulsion burst time,
Firing order from the top down, to form effectively continuous cavity, promotes to generate cavitation effect, abnormal shape weight bell exists by detonative action
Cavitation effect is generated in blast hole, effect is rammed in raising；
E, abnormal shape weight bell is hung out out of blast hole, filler is then inserted into blast hole, then extract protection cylinder；
F, common pile monkey is changed, strong rammer operation is again carried out, keeps filler closely knit, form compound foundation.
2. a kind of soft soil foundation burst point cavitation dynamic compaction method according to claim 1, the emulsion is in blast hole
Spacing be 2.5~3.5 meters between.
3. a kind of soft soil foundation burst point cavitation dynamic compaction method according to claim 2, it is characterized in that: filler is deposited in protection
Filler is packed into blast hole by protection cylinder after extracting special-shaped weight bell, then passes through vibration using vibration pile-drawing machine by cylinder outside
Method extracts protection cylinder.
4. a kind of soft soil foundation burst point cavitation dynamic compaction method according to claim 3 protects it is characterized in that: filler is packed into
Stop being packed into filler when distance of the filler in blast hole away from explosion aperture is 3~4 meters when cylinder, continue after protection cylinder is extracted
Filler is packed into blast hole, until it is secondary to blast hole progress strong to reuse common column hammer slightly beyond explosion aperture for filler
It rams.
5. a kind of soft soil foundation burst point cavitation dynamic compaction method according to claim 1, it is characterized in that: symmetrical on the outside of protection cylinder
If supplemental protective cylinder keeps stablizing there are four slidingtype A-frame.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910616976.4A CN110319739B (en) | 2017-12-01 | 2017-12-01 | Blasting dynamic compaction linkage device |
| CN201711245936.0A CN108005055B (en) | 2017-12-01 | 2017-12-01 | A kind of soft soil foundation burst point cavitation dynamic compaction method and its complexes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711245936.0A CN108005055B (en) | 2017-12-01 | 2017-12-01 | A kind of soft soil foundation burst point cavitation dynamic compaction method and its complexes |
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| CN201910616976.4A Division CN110319739B (en) | 2017-12-01 | 2017-12-01 | Blasting dynamic compaction linkage device |
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| CN108005055A CN108005055A (en) | 2018-05-08 |
| CN108005055B true CN108005055B (en) | 2019-08-06 |
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| CN112982390A (en) * | 2019-12-17 | 2021-06-18 | 上海三航奔腾海洋工程有限公司 | Steel casing of rock-socketed cast-in-place pile capable of not sinking along with punching |
| CN115014999A (en) * | 2022-01-19 | 2022-09-06 | 昆明理工大学 | Testing device and testing method for liquefaction degree of saturated sandy soil under explosive load |
| CN115387320A (en) * | 2022-08-02 | 2022-11-25 | 济南黄河路桥建设集团有限公司 | Rocket hammer column ramming and full ramming combined construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101538849B (en) * | 2007-06-28 | 2010-11-17 | 刘汉龙 | Foundation treatment method combining vibration ramming compaction at shallow layer and blasting compaction at deep layer with well-point dewatering |
| CN100532729C (en) * | 2007-06-28 | 2009-08-26 | 刘汉龙 | High vacuum well-points dewatering groundwork treatment method by shallow ramming compaction and deep blasting compaction |
| CN203259075U (en) * | 2013-03-12 | 2013-10-30 | 中国建筑第四工程局有限公司 | Blasting device used in boring cast-in-situ pile |
| CN104234031B (en) * | 2013-06-18 | 2015-12-16 | 郑州宇通重工有限公司 | A kind of full-automatic de-hook dynamic compaction machinery |
| CN105113478A (en) * | 2015-08-31 | 2015-12-02 | 山东省城乡建设勘察设计研究院 | Dynamic compaction treatment method of deep foundation displacement |
| CN206015653U (en) * | 2016-06-20 | 2017-03-15 | 叶吉 | A kind of pipe of reinforced soft soil ground is rammed |
| CN107356168B (en) * | 2017-07-25 | 2019-11-29 | 中铁四局集团第二工程有限公司 | A kind of deep water inclined naked batholith plinth underwater demolition construction method |
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| CN110319739A (en) | 2019-10-11 |
| CN110319739B (en) | 2021-10-01 |
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