CN208313149U - A kind of presplit blasting blast hole projectile filling device for excavation of foundation pit - Google Patents
A kind of presplit blasting blast hole projectile filling device for excavation of foundation pit Download PDFInfo
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- CN208313149U CN208313149U CN201820725195.XU CN201820725195U CN208313149U CN 208313149 U CN208313149 U CN 208313149U CN 201820725195 U CN201820725195 U CN 201820725195U CN 208313149 U CN208313149 U CN 208313149U
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- cylinder
- excavation
- foundation pit
- blasting
- filling device
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Abstract
The utility model discloses a kind of presplit blasting blast hole projectile filling devices for excavation of foundation pit, including sealed cylindrical and setting strut within the barrel, bottom cushion, electric detonator and several by the concatenated blasting charge of primacord, the bottom cushion is mounted on the bottom of cylinder, strut is embedded in inside bottom cushion and is fixed on cylinder center position, the blasting charge is fixed on strut, electric detonator is fixed together with a certain blasting charge therein, and is connect by conducting wire with external initiator；The cylinder top is equipped with stopple, is full of aqueous medium in the cylinder；The utility model overcomes the installation problem that arbitrariness is also big, explosion precision is not high in explosive position in traditional presplit blasting, it is ensured that the integrity degree of presplit blasting contour line.
Description
Technical field
The utility model belongs to blasting engineering technical field, and in particular to a kind of presplit blasting blasthole for excavation of foundation pit
Means for loading.
Background technique
Presplit blasting is answered extensively in the engineerings such as the Shockproof damping of underground excavation project, slope treatment and large-scale explosion
With.When presplit blasting refers to progress rock excavation, first producing one in the forward position design profile line of the area Zhu Bao explosion has centainly
The through crack of width controls it to the destroying infection for retaining rock mass, is allowed to obtain to buffer, reflect the vibration wave of Excavation blasting
Obtain more smooth outline excavation.Presplit blasting is not only excavated in vertical, inclination and is used widely on wall surface；In the song of rule
Face, warp surface and horizontal foundation plane etc. also use presplit blasting.
At present mainly using series connection spaced loading structure in presplit blasting, according to the big of the linear charging density of regulation
Small, the small medicine coil standard powder stick or voluntarily restructured is banded on primacord at a certain distance, and is bound on bamboo chip together
Or on bamboo pole, it is put into hole.It is quick-fried to eventually affect presplitting the problem is that the position installed is difficult to control accurately in implementing for it
Broken effect.
Utility model content
The utility model proposes a kind of presplit blasting blast hole projectile filling devices for excavation of foundation pit, and detonator and explosive are set
It sets in the middle part of sealed cylindrical, so that explosive is in the center of blasthole, accurately controls explosive effect, while cylinder interior is filled
Full water medium reduces Blasting shock wave pressure peak, reduces the destruction to shot rock, it is ensured that contour line it is complete
Degree.
The specific technical solution of the utility model is as follows:
A kind of presplit blasting blast hole projectile filling device for excavation of foundation pit, the branch including sealed cylindrical and setting within the barrel
Bar, bottom cushion, electric detonator and several by the concatenated blasting charge of primacord, the bottom cushion is mounted on the bottom of cylinder
Portion, strut are embedded in inside bottom cushion and are fixed on cylinder center position, and the blasting charge is fixed on strut, electronics thunder
Pipe is fixed together with a certain blasting charge therein, and is connect by conducting wire with external initiator；The cylinder top
Stopple is installed, is full of aqueous medium in the cylinder.
Further, the strut is iron wire, is embedded in inside bottom cushion.
Further, cylinder is made of PVC material.
Further, the top of sealed cylindrical is provided with stopple, realizes inner sealing.
Further, the stopple is part pyramid like configuration made of rubber.
Further, bottom cushion is made of expandable polystyrene is foam-formed.
Further, the conducting wire of detonator is pierced by by the through-hole in the middle part of stopple.
Further, bottom cushion is provided centrally with fixation hole, and strut is mounted on fixation hole.
The advantageous effects that the utility model has are as follows:
1, the utility model is provided with powder charge cylinder in blasthole, and explosive is arranged on the center line of cylinder, and cylinder
Outer diameter and blasthole internal diameter are close, it is ensured that explosive is on the center of blasthole in installation and blast process, and then is overcome
The installation problem that arbitrariness is also big, explosion precision is not high in explosive position in traditional presplit blasting, it is ensured that presplit blasting contour line
Integrity degree.
2, the utility model is provided with bottom cushion in the bottom of powder charge cylinder, and can according to need to change bottom pad
The height of layer, has adapted to the requirement in blasting engineering to blasthole difference elevation parameter, while the bottom cushion is made of foam,
Explosive charge is buffered, the protective effect protected to explosion contour line is played.
3, the utility model cylinder is filled with aqueous medium in inside simultaneously using sealing structure, during explosive charge, drop
Low Blasting shock wave pressure peak, reduces the destruction to shot rock, it is ensured that the integrity degree of contour line；Aqueous medium simultaneously
It can function as filler, block blasthole, reduce the loss of explosive energy, and prevent from brewing accident in explosion construction.
4, the stopple of the utility model is provided centrally with through-hole, and fixation hole, one end of strut is arranged in the center of bottom cushion
It is mounted on fixation hole, the other end passes through the through-hole at stopple center, ensures that strut is on the center line of cylinder, finally
It ensures that explosive is in the center of cylinder, improves the precision of presplit blasting, and there is structure to implement simply, on a large scale
Convenient feature.
Detailed description of the invention
Fig. 1 is the utility model presplit blasting system theory of constitution schematic diagram；
The structural schematic diagram of Fig. 2 the utility model presplit blasting blast hole projectile filling device；
Fig. 3 is the utility model means for loading scheme of installation in presplit blasting blasthole；
Appended drawing reference is as follows:
1-strut；2-electric detonators；3-aqueous mediums；4-the blastings charge；5-primacords；6-cylinders；7-stopples；9—
Conducting wire；10-blastholes；11-quick-fried the hearts；12-the areas Zhu Bao；13-contour lines；14-rocks；15-bottom cushions；16-through-holes；
20-means for loadings；21-initiators.
Specific embodiment
One, presplit blasting blast hole projectile filling system and device
As shown in Figure 1, presplit blasting is the brill tier hole 10 on shot rock 14, means for loading 20 is arranged in blasthole 10
Inside, using Uncoincided charge mode, initiator 21 ignites internal electronics thunder before 12 explosion of the area Zhu Bao where the quick-fried heart 11
Pipe, detonate this row's means for loading, breaks rock 14 at excavation face, forms the contour line 13 in neat perforation crack.
In order to realize that the effect of presplit blasting is accurately controlled, and obtain ideal explosion contour line, the structure of this patent
Want to overcome the mode of traditional random powder charge, and use the charge constitution of careful design, it is ensured that setting of the explosive in blasthole
Position carries out explosion, while reducing the impact crest value of explosion, protects to hole wall.
As shown in Figures 2 and 3, the means for loading of the utility model include sealed cylindrical 6 and be arranged in cylinder 6 strut 1,
Bottom cushion 15, electric detonator 2 and several are the blasting charge 4 of string-like by primacord 5, and the dose of the blasting charge 4 is according to theory
The accurate control of calculating, wherein electric detonator 2 is fixed together with a certain blasting charge 4 therein, and passes through conducting wire 9 and outside
Initiator connection；Coupled between the blasting charge 4 and the blasting charge 4 by primacord 5, the purpose is to ensure in a blasting charge 4 wherein
After cap sensitive, the explosion of other blastings charge 4 can be reliably ignited.
Bottom cushion 15 is mounted on the bottom of cylinder 6, and strut 1 is embedded in 15 inside of bottom cushion and is fixed on cylinder center
Position, the blasting charge are fixed on strut, it can be ensured that and explosive is in the position of center line of cylinder 6, and in implementing, cylinder 6
Outer diameter be less than 10 internal diameter 5-10mm of blasthole, and cylinder 6 is placed on the center of blasthole 10, it can be ensured that every blasting charge 4 from
The centerline of blasthole 10 starts to detonate, to accurately be controlled presplitting effect.
In order to reduce the destruction to blasthole palisades, stopple 7 is arranged in the top of the utility model cylinder 6, and rubber can be used in stopple 7
Part pyramid like configuration made of glue is pressed on the top of cylinder 6.Stopple 7 is provided centrally with through-hole 16, and electric detonator 2 is led
Line 9 is pierced by by the through-hole 16 of stopple 7, and the inner sealing of cylinder 6 is realized under the action of extruding force.
6 inner filling water medium 3 of cylinder, can reduce the initial peak pressure of explosion wave, extend the effect of shock wave
Time reduces the destruction to palisades, it is ensured that retains the stability of palisades, while aqueous medium 3 can function as filler, blocks big gun
The loss of explosive energy is reduced in hole, prevents from brewing accident in explosion construction.
The bottom of cylinder 6 is provided with bottom cushion 15, and can according to need to change the thickness of bottom cushion 15, adapts to
Requirement in blasting engineering to blasthole difference elevation parameter, while the bottom cushion 15 is made of foam, to explosive charge
It is buffered, reduces the destruction to palisades, play the protective effect protected to explosion contour line.
Cylinder 6 uses PVC circular tube structure, itself also has partial buffer effect, bottom cushion 15 is fixed on the bottom of cylinder 6
Portion, the middle part of bottom cushion 15 are provided with fixation hole, and strut 1 is fixed in the fixation hole, it is ensured that its centre bit for being in cylinder 6
It sets.Bottom cushion 15 can be used that expandable polystyrene is foam-formed to be made, and iron wire can be used in strut 1, and lower end is inserted directly into simultaneously
It is fixed in the middle part of foam, upper end then passes through the central through hole 16 of stopple 8, limited up and down, it is ensured that the essence of fixed position
Degree.
Two, presplit blasting parameter designing
The explosion time difference, blast hole parameter, the not coefficient of coup, pitch of holes coefficient, powder charge ginseng are mainly considered in presplit blasting design
Number etc..
(1) the explosion time difference
As soon as theory analysis shows that the pre- ceasma detonating delay time of row is shorter with engineering practice, presplitting effect is better.This patent
The blasthole just arranged is carried out while being detonated using digital electric detonator, detonating delay time is close to zero, and general Nonel detonator
The time difference is difficult to control, typically at least in several milliseconds.At present digital electric detonator can impregnate in an aqueous medium 10 hours or so and
Still reliable to ignite.
(2) blast hole parameter
Blasthole diameter is two kinds of 90mm, 120mm.Blast hole depth, that is, presplitting bottom hole should reach excavation pit layer under normal circumstances
Bottom elevation.The utility model presplitting hole depth rate bottom hole wants 1.0~2.0m of ultra-deep.If this ultra-deep is engineering institute to the destruction of basement rock
Do not allow, then should properly increase bottom hole elevation or bottom hole elevation is constant, and the not blasting charge at 0.5~1m of hole bottom.This reality
With novel then by changing 15 thickness of bottom cushion of 6 bottom of cylinder, requirement in this respect is simply met very much.
(3) not coefficient of coup ξ
When presplit blasting, to make rock mass crack and so that palisades is wrecked, it is desirable to which shock is in hole wall
On radial pressure to be lower than the compressive ultimate strength of rock mass, and the tangential tensile stress thus derived from then will be more than the anti-of rock mass
Tensile strength.For this fragile material some for rock, concrete etc., it is easier to reach.The pressure resistance of usual rock
Degree is 10~100MPa or more, and tensile strength is much lower, is less than its 1/10, this is just to meet above-mentioned requirements, is mentioned
Advantageous condition is supplied.
Under normal circumstances, when explosive charge pack surface shock wave pressure peak value, up to 1000MPa or more, this
Numerical value is considerably beyond the compression strength of rock, and therefore, the rock mass around pack is crushed to powdery, in order to mitigate effect
In the pressure on palisades, other than using low brisance, low explosive, it is still necessary to take decoupling charge structure, i.e. blasthole is straight
Diameter D is greater than powder stick diameter d.The definition of coefficient of coup ξ is not ξ=D/d.Because of D >=d, therefore always there is ξ >=1.The coefficient of coup can not
It is determined with following empirical formula:
ξ=1+18.32 σ-0.26, in formula, σ is rock compressive ultimate strength, is equal to 105Pa.The parameter of the utility model is set
ξ=2~4, i.e. D=(2~4) d are taken in meter.
(4) pitch of holes coefficient
Pitch of holes coefficient E is the ratio of pitch-row a and blasthole diameter D, i.e.,
E=a/D
Pitch-row a and pitch of holes coefficient E is the important parameter of presplit blasting.If only from improve construction efficiency for, choose compared with
Big pitch-row can reduce presplitting hole drill hole number, but this will be such that dynamite quantity per hole increases, it cannot be guaranteed that presplitting wall surface smooth and
Retain the complete of basement rock.Theoretical research is proved with engineering practice, using small pitch, the method for dispersion powder charge, presplit blasting
Effect is relatively good.
When mono- timing of d, in ξ=2~4 ranges, if a and D are increased in proportion to, necessarily cause under presplitting quality
Drop；In other words, certain presplitting quality is kept, it is smooth especially for important engine request presplitting wall surface with the increase of D
When spending high, lesser E value should be used.Pitch of holes coefficient E=7~12 of the utility model, and line between contour line and blasthole
Distance L be about pitch-row a half.
(5) data of explosive filled
Linear charging density generally takes 250~400g/m3, charge structure, which uses, to be dispersed on the form fixed value strut of powder stick,
The adjacent spacing b for dispersing powder stick is not more than the gap distance 50cm of powder stick.In view of the clamping action of bottom hole, bottom pack should add
Strong equivalent, about the 2~5 of middle and upper part linear charging density times.Not powder charge in depth away from aperture 1m or so when powder charge, can pass through tune
The pack of section the top is realized at a distance from barrel top.
Test of many times verification result shows: means for loading and the explosive parameters design of the utility model realize precracking
Slit width is greater than 1.0cm in light weathered granite, and slit width reaches 1.5cm or more in middle weathered granite rock, and surveys vibration
Dynamic parameter improves 30% than the means for loading effectiveness in vibration suppression of anhydrous medium, and the irregularity degree after pre- broken face excavates is less than 5cm, super deficient
Rate is that the blasthole trace retention rate within positive and negative 5cm, on pre- broken face should be not less than 90%, and nearby rock seriously blasthole does not occur
Blasting crack.The utility model effective protection palisades and stability of slope, can be used for City Subway Station foundation pit Blasting Excavation
The presplit blasting of equal foundation pits reaches damping and protects the double effects of palisades.
Claims (8)
1. a kind of presplit blasting blast hole projectile filling device for excavation of foundation pit, it is characterised in that: exist including sealed cylindrical and setting
Strut, bottom cushion, electric detonator in cylinder and several by the concatenated blasting charge of primacord, the bottom cushion installation
In the bottom of cylinder, strut is embedded in inside bottom cushion and is fixed on cylinder center position, and the blasting charge is fixed on branch
On bar, electric detonator is fixed together with a certain blasting charge therein, and is connect by conducting wire with external initiator；It is described
Cylinder top stopple is installed, aqueous medium is full of in the cylinder.
2. the presplit blasting blast hole projectile filling device according to claim 1 for excavation of foundation pit, it is characterised in that: described
Strut is iron wire, is embedded in inside bottom cushion.
3. the presplit blasting blast hole projectile filling device according to claim 1 for excavation of foundation pit, it is characterised in that: cylinder is adopted
It is made of PVC material.
4. the presplit blasting blast hole projectile filling device according to claim 1 for excavation of foundation pit, it is characterised in that: sealing circle
The top of cylinder is provided with stopple, realizes inner sealing.
5. the presplit blasting blast hole projectile filling device according to claim 4 for excavation of foundation pit, it is characterised in that: described
Stopple is part pyramid like configuration made of rubber.
6. the presplit blasting blast hole projectile filling device according to claim 1 for excavation of foundation pit, it is characterised in that: bottom pad
Layer is made of expandable polystyrene is foam-formed.
7. the presplit blasting blast hole projectile filling device according to claim 6 for excavation of foundation pit, it is characterised in that: detonator
Conducting wire is pierced by by the through-hole in the middle part of stopple.
8. the presplit blasting blast hole projectile filling device according to claim 1 for excavation of foundation pit, it is characterised in that: bottom pad
Layer is provided centrally with fixation hole, and strut is mounted on fixation hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820725195.XU CN208313149U (en) | 2018-05-16 | 2018-05-16 | A kind of presplit blasting blast hole projectile filling device for excavation of foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820725195.XU CN208313149U (en) | 2018-05-16 | 2018-05-16 | A kind of presplit blasting blast hole projectile filling device for excavation of foundation pit |
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| CN208313149U true CN208313149U (en) | 2019-01-01 |
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| CN201820725195.XU Expired - Fee Related CN208313149U (en) | 2018-05-16 | 2018-05-16 | A kind of presplit blasting blast hole projectile filling device for excavation of foundation pit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426494A (en) * | 2018-05-16 | 2018-08-21 | 厦门爆破工程公司 | A kind of presplit blasting blast hole projectile filling device for excavation of foundation pit |
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2018
- 2018-05-16 CN CN201820725195.XU patent/CN208313149U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426494A (en) * | 2018-05-16 | 2018-08-21 | 厦门爆破工程公司 | A kind of presplit blasting blast hole projectile filling device for excavation of foundation pit |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190101 Termination date: 20210516 |
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| CF01 | Termination of patent right due to non-payment of annual fee |