CN106595410A - Deep foundation pit earth pressure controlled blasting method - Google Patents
Deep foundation pit earth pressure controlled blasting method Download PDFInfo
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- CN106595410A CN106595410A CN201611211330.0A CN201611211330A CN106595410A CN 106595410 A CN106595410 A CN 106595410A CN 201611211330 A CN201611211330 A CN 201611211330A CN 106595410 A CN106595410 A CN 106595410A
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- blasting
- foundation pit
- voltage
- deep foundation
- blasting method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a deep foundation pit earth pressure controlled blasting method which comprises the following steps: before hole drilling, cleaning up floating slag, living stones and hydrops on a working face; perpendicularly drilling holes in a designated position, wherein the bottoms of shot holes are basically on the same horizontal plane; clearing the holes after hole drilling; producing stemming, selecting standard emulsion explosive for powder charging, using non-electric millisecond delay detonators and detonating cords, and carrying out firm wiring; covering blasting bodies with steel plates and sandy soil, and finally, releasing water to fill gaps in the shot holes and the up-down gaps of the steel plates; arranging sandy soil piles to surround the side, close to a high-tension cable, an existing line, a residential area and a workshop, of a bridge pier, especially the sections close to the high-tension cable and the existing line; arranging a blasting guard at each crossing; after a monitor sends out a blasting command, picketing and starting to carry out blasting after ensuring that the surrounding is safe by a blasting staff; and removing the guard after ensuring that a danger is removed. With adoption of the method, the construction speed is accelerated, the blasting shaking speed, blasting dust and noise are reduced, safety of the residential area and the workshop is ensured, the work hindrance problem by villagers is solved, and the economic loss of an enterprise is reduced.
Description
Technical field
The present invention relates to a kind of voltage-controlled blasting method processed of the deep foundation pit soil for effectively preventing slungshot, specifically in blasting body
Top covers the Controlled blasting technique of sandy soil.
Background technology
Grand bridge total length 1959.65m, there is 2 abutments and 58 bridge piers, pier footing have cast-in-situ bored pile, open cut foundation,
Dig a well basic three kinds of forms, and the geological condition of deep foundation is followed successively by from top to bottom：Plain fill, silty clay, thin coarse sand, underlie it is complete
Weathering is to weak weathered granite.53#～58# piers dig a well 6～8m of depth of foundation, and during site operation, average lower digging after 2～3m entering
Weak weathered granite.The grand bridge be located at Huan Ren counties Pu Lebao towns Lao Manzi villages, close on both wired, 220KV high-voltage lines, factory building and
Residential block.
To ensure transmission line safety, it is impossible to using conventional blasting method method, can only be using non-explosions such as artificial, machineries
Method is excavated, and progress is too slow.
The content of the invention
The purpose of the present invention is that solution conventional blasting method is excavated and produces slungshot, the problems such as non-explosion progress is too slow, proposes
One kind effectively prevents a kind of deep basal pit blasting scheme of slungshot, and the method is practical, efficient, economical.
The technical scheme is that：The voltage-controlled blasting method processed of deep foundation pit soil, it is characterised in that：The method is according to following step
Suddenly carry out：
The floating quarrel of working face stone living and ponding are cleaned out before S1 jewel holes, it is to avoid eye is determined during jewel hole and is forbidden and bit freezing.
The whole working faces of S2 are substantially smooth, and cloth eye is uniform, and determine eye accurately will remove the vertical perforating of air leg using air drill,
The hollow hexagonal steel that drilling rod is not waited from Φ 18mm × (1.8～4.5m) length, drill bit is bored using Φ 42mm yi word patterns steel alloy
Head, the bottomed depth of borehole is basic on a horizontal plane.
After the completion of S3 jewel holes, pressure wind is connected with a device is swept, broken quarrel and muddy water in borehole are cleaned out, it is ensured that powder charge is arrived
Bottom.
S4 explosives select specification Φ 30mm × 200mm × 200g emulsions, and field fabrication stemming, diameter of phi 35mm is long
Degree 200mm or so, facilitates placement into blasthole.Powder charge, coefficient of decoupling charge K=45/ are carried out using positive continuous charging structure
30=1.5, remaining blasthole length is filled up using stemming.Using non-electrical millisecond delay cap and the primacord of length 7.0m, connect
Line is firm and solid, it is ensured that be powered good, follow-up work will ensure that detonator wire is intact, prevent from breaking, break.
To avoid propagation of explosion from interrupting, Section 5 medicine fills 1 with segment number i.e. 1 section detonator to S5 in the snubber more than powder charge；In rectangle
In reliever, Section 4 medicine every three eyes installs 1 additional with segment number i.e. 3 section detonator, it is ensured that explosive all detonates.
S6 is that 6mm steel plates cover blasting body with 2 respective area thickness, and steel plate is connected with 4 bolts, and upper pressure 2～4 is given up
Legacy steel, then 0.5m thickness left and right sand is pressed, then 1 layer of steel plate is put, upper lid 0.5m thickness sand finally discharges water blasthole internal clearance, steel
The upper and lower space filling of plate.In protection process is set up, detonator connecting line is protected by, prevent from breaking payment to a porter, connecting line.
S7 bridge piers are near high-voltage line, both wired, residential block, factory building side set sand heap and go along with sb. to guard him, sand heap go along with sb. to guard him height,
Or enclosing is carried out with color steel, bamboo rake, the especially location by high-voltage line, both wired.
S8 warning distances are more than 200m, and every crossing is intended to set blast warning, and equipment, personnel, animal are intended to evacuate to peace
Outside full distance, operating personnel's band safety cap.
S9 carries out the person of blowing out, squad leader and security official's linkage blasting system.Blasting guarding is responsible for by security official, squad leader is responsible for finger
Wave, the person of blowing out blows picket after squad leader sends and blows out instruction, confirm just to start detonation after surrounding safety.After detonation, 15 are waited
Go to check again after minute, get rid of the danger, after confirming without danger, then release warning.
The present invention has the advantage that and good effect：
1st, using soil pressure blasting technique, efficiency of construction is substantially increased, a rate of advance is improved by 0.2 original～0.3m/d
To 3.0～4.0m/d, more than 13 times of work efficiency raising, speed of application is accelerated.
2nd, steel plate and sandy soil and priming petock are covered in blasting body, have prevented slungshot, it is ensured that neighbouring high-tension line and
The safety of existing railway；Reduce blast-shaking speed, quick-fried dirt and noise, it is ensured that residential block, the safety of factory building, control and disturb residents,
Villager's resistance work difficult problem is solved, business economic loss is reduced.Ginger man fort grand bridge 55# pier explosion initial conditions of table 2 and pre-
Phase demolition effect.
Description of the drawings
Fig. 1 digs a well basic borehole layout drawing for 55# piers (size is in meters).
Fig. 2 is A-A profiles.
Specific embodiment
As shown in Figure 1-2, a kind of Controlled blasting technique that sandy soil are covered above blasting body.Specific implementation process is as follows：
1st, the floating quarrel of working face stone living and ponding are cleaned out before jewel hole, it is to avoid eye is determined during jewel hole and is forbidden and bit freezing.
2nd, whole working face is substantially smooth, and cloth eye is uniform, determines eye accurately, removes air leg using YT-29 type air drills and vertically beats
Eye, from the hollow hexagonal drill steel that Φ 18mm × (1.8～4.5m) length is not waited, is bored using Φ 42mm yi word patterns steel alloy
Head, borehole bottom is substantially on a horizontal plane.
3rd, after the completion of jewel hole, with sweep a device connect pressure wind carry out borehole cleaning, it is ensured that powder charge is on earth.
4th, from specification Φ 30mm × 200mm × 200g emulsions, field fabrication diameter of phi 35mm, length 200mm are left
Right stemming, facilitates placement into blasthole.Powder charge, coefficient of decoupling charge K=45/30=are carried out using positive continuous charging structure
1.5, remaining blasthole length is filled up using stemming.Using non-electrical millisecond delay cap and the primacord of length 7.0m, line jail
Lean on, it is ensured that be powered good, follow-up work notes protection.
5th, in order to avoid propagation of explosion interruption, Section 5 medicine fills 1 same segment number (1 section) detonator in the snubber more than powder charge；In square
In shape reliever, Section 4 medicine every three eyes installs 1 same segment number (3 sections) detonator additional, it is ensured that explosive all detonates.
6th, it is that 6mm steel plates cover blasting body with 2 respective area thickness, steel plate is connected with 4 bolts, upper pressure 2～4 is given up
Legacy steel, then 0.5m thickness left and right sand (removing stone, it is to avoid produce slungshot) is pressed, then 1 layer of steel plate is put, upper lid 0.5m thickness sand,
Finally discharge water blasthole internal clearance, the upper and lower space filling of steel plate.In protection process is set up, detonator connecting line is protected
Shield, ten million can not break payment to a porter, connecting line.
7th, bridge pier was near high-voltage line, both wired, residential block, factory building side set sand heap and went along with sb. to guard him, and height is tried one's best height, or with coloured silk
Steel plate etc. carries out enclosing, especially the location by high-voltage line, both wired.
8th, warning distance is more than 200m, and every crossing is intended to set blast warning, equipment, personnel, animal etc. and is intended to evacuate to
Outside safe distance, operating personnel's band safety cap.
9th, the person of blowing out, squad leader and security official's linkage blasting system are carried out.Blasting guarding is responsible for by security official, squad leader is responsible for finger
Wave, the person of blowing out blows picket after squad leader sends and blows out instruction, confirm just to start detonation after surrounding safety.After detonation, 15 are waited
Go to check again after minute, get rid of the danger, after confirming without danger, then release warning.
The ginger man fort grand bridge 55# pier blasting parameter design tables of table 1
Fig. 2 ginger man fort grand bridge 55# pier explosion initial conditions and expected blasting effect.
Claims (6)
1. the voltage-controlled blasting method processed of deep foundation pit soil, it is characterised in that：The method is carried out according to the following steps：By work before S1 jewel holes
The floating quarrel in face stone living and ponding are cleaned out；S2 carries out vertical perforating in specified location, and borehole bottom is substantially on a horizontal plane；
Borehole cleaning is carried out after the completion of S3 jewel holes；S4 makes stemming, and from specification Φ 30mm × 200mm × 200g emulsions powder charge is carried out,
Using non-electrical millisecond delay cap and primacord, line is firm, and follow-up work notes protection；S5 steel plates and sandy soil cover explosion
Body, finally discharges water blasthole internal clearance, the upper and lower space filling of steel plate；S6 bridge piers are near high-voltage line, both wired, residential block, factory building
Side sets sand heap and goes along with sb. to guard him, especially the location by high-voltage line, both wired；Every crossing of S7 is all provided with blast warning, equipment, people
Member, animal etc. are intended to evacuate to outside safe distance 200m, operating personnel's band safety cap；S8 is sent in squad leader by the person of blowing out and is blown out
After instruction, picket is blown, confirm just to start detonation after surrounding safety；Wait after detonation and go again within 15 minutes to check, get rid of the danger, confirm nothing
After danger, then release warning.
2. the voltage-controlled blasting method processed of deep foundation pit soil according to claim 1, it is characterised in that：Above-mentioned employing Φ 18mm ×
Hollow hexagonal drill steel that (1.8～4.5m) length is not waited, that Φ 42mm yi word patterns alloy tool steel bits remove air leg with air drill is vertical
Perforating.
3. the voltage-controlled blasting method processed of deep foundation pit soil according to claim 1, it is characterised in that：Field fabrication diameter of phi
The stemming of 35mm, length 200mm or so, facilitates placement into blasthole, and using positive continuous charging structure powder charge is carried out, powder charge not coupling
Syzygy number K=45/30=1.5, remaining blasthole length is filled up using stemming；With non-electrical millisecond delay cap and length 7.0m
Primacord.
4. the voltage-controlled blasting method processed of deep foundation pit soil according to claim 1, it is characterised in that：In order to avoid propagation of explosion interruption,
Section 5 medicine fills 1 with segment number i.e. 1 section detonator in the snubber more than powder charge；In rectangle reliever, every the 4th of three eyes the
Section medicine installs 1 additional with segment number i.e. 3 section detonator, it is ensured that explosive all detonates.
5. the voltage-controlled blasting method processed of deep foundation pit soil according to claim 1, it is characterised in that：With 2 respective area thickness
Blasting body is covered for 6mm steel plates, steel plate is connected with 4 bolts, 2～4 waste and old shaped steel of upper pressure, then 0.5m thickness left and right sand is pressed,
1 layer of steel plate is put again, and upper lid 0.5m thickness sand finally discharges water blasthole internal clearance, the upper and lower space filling of steel plate；Protected setting up
Cheng Zhong, is protected by detonator connecting line, forbids to break payment to a porter, connecting line.
6. the voltage-controlled blasting method processed of deep foundation pit soil according to claim 1, it is characterised in that：Bridge pier near high-voltage line, both
Wired, residential block, the higher the better for the sand heap of factory building side, or is protected using color steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611211330.0A CN106595410A (en) | 2016-12-24 | 2016-12-24 | Deep foundation pit earth pressure controlled blasting method |
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| CN201611211330.0A CN106595410A (en) | 2016-12-24 | 2016-12-24 | Deep foundation pit earth pressure controlled blasting method |
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| CN201611211330.0A Pending CN106595410A (en) | 2016-12-24 | 2016-12-24 | Deep foundation pit earth pressure controlled blasting method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109059690A (en) * | 2018-09-10 | 2018-12-21 | 中铁十八局集团有限公司 | A kind of open cut tunnel for effectively preventing slungshot, reducing vibration is perpendicular to dig standing method |
| CN109059691A (en) * | 2018-09-10 | 2018-12-21 | 中铁十八局集团有限公司 | A kind of open cut tunnel for effectively preventing slungshot, reducing vibration is perpendicular to dig standing method |
| CN109579645A (en) * | 2017-09-28 | 2019-04-05 | 广东省长大公路工程有限公司 | A kind of tunnel hydraulic pressure demolition constructing structure and its application |
| CN110644494A (en) * | 2019-09-03 | 2020-01-03 | 中国建筑一局(集团)有限公司 | Combined blasting construction method for large-diameter deep foundation pit |
| CN111043923A (en) * | 2019-12-10 | 2020-04-21 | 中铁隆工程集团有限公司 | Blasting method suitable for adjacent important buildings |
| CN111121573A (en) * | 2019-12-30 | 2020-05-08 | 临沂会宝岭铁矿有限公司 | Ground loosening blasting method for dense plant area |
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| RU2156431C1 (en) * | 2000-03-01 | 2000-09-20 | Жученко Евгений Иванович | Method for charging-in of deep-hole and design of deep-hole charge |
| CN103410153A (en) * | 2013-08-30 | 2013-11-27 | 南通八建集团有限公司 | Adjacent deep foundation trench and shallow foundation trench synchronous construction method |
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| RU2156431C1 (en) * | 2000-03-01 | 2000-09-20 | Жученко Евгений Иванович | Method for charging-in of deep-hole and design of deep-hole charge |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579645A (en) * | 2017-09-28 | 2019-04-05 | 广东省长大公路工程有限公司 | A kind of tunnel hydraulic pressure demolition constructing structure and its application |
| CN109059690A (en) * | 2018-09-10 | 2018-12-21 | 中铁十八局集团有限公司 | A kind of open cut tunnel for effectively preventing slungshot, reducing vibration is perpendicular to dig standing method |
| CN109059691A (en) * | 2018-09-10 | 2018-12-21 | 中铁十八局集团有限公司 | A kind of open cut tunnel for effectively preventing slungshot, reducing vibration is perpendicular to dig standing method |
| CN110644494A (en) * | 2019-09-03 | 2020-01-03 | 中国建筑一局(集团)有限公司 | Combined blasting construction method for large-diameter deep foundation pit |
| CN111043923A (en) * | 2019-12-10 | 2020-04-21 | 中铁隆工程集团有限公司 | Blasting method suitable for adjacent important buildings |
| CN111121573A (en) * | 2019-12-30 | 2020-05-08 | 临沂会宝岭铁矿有限公司 | Ground loosening blasting method for dense plant area |
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Application publication date: 20170426 |
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