CN107504872A - It is a kind of to prevent tunnel arch foot to owe the blasting method dug - Google Patents
It is a kind of to prevent tunnel arch foot to owe the blasting method dug Download PDFInfo
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- CN107504872A CN107504872A CN201710820158.7A CN201710820158A CN107504872A CN 107504872 A CN107504872 A CN 107504872A CN 201710820158 A CN201710820158 A CN 201710820158A CN 107504872 A CN107504872 A CN 107504872A
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- porose area
- arch springing
- bottom plate
- arch
- region
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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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention belongs to Tunnel Blasting technical field, there is provided a kind of to prevent tunnel arch foot to owe the blasting method dug.Tunnel arch foot region is divided into three sub-regions：Arch springing porose area, bottom plate porose area and periphery porose area；Described arch springing porose area is the region for only including arch springing hole；Described bottom plate porose area is comprising several bottom plate holes and is not more than 0.5m close to the region of arch springing porose area, zone length；Periphery porose area is comprising several periphery holes and is not more than 0.5m close to the region of arch springing porose area, region height；Described bottom plate porose area is identical with periphery porose area firing order, or bottom plate porose area and periphery porose area detonate according to sequencing, and arch springing porose area finally detonates；Arch springing porose area lags behind 100~300ms of last detonation subregion.The present invention can effectively solve the problems, such as that hard rock tunnel arch springing owes digging, improve tunnel Forming Quality, save engineering cost.
Description
Technical field
The invention belongs to Tunnel Blasting technical field, is related to a kind of blasting method for preventing tunnel arch foot to owe digging.
Background technology
Drill bursting construction is the common method of tunnel excavation, because it has good adaptability to different geological conditions,
It is low to excavate cost, the breaking surrounding rock that is particularly suitable for use in tunnel, solid rock tunnel and the construction of a large amount of short tunnels are current or even future
The Main Means of regular period inner tunnel driving.However, limited by construction equipment and construction level, the hard rock that drilling and blasting method excavates
Usually there is deficient digging, especially tunnel arch foot position in tunnel, big by rock clamping action, and it is particularly problematic, it is necessary to two to owe digging
Secondary benefit big gun or mechanical equivalent of light excavation, greatly reduce blast working efficiency, increase engineering cost.Therefore how to optimize arch springing region blasting parameter
Control tunnel arch foot is owed digging and is particularly important.
Prevent the prior art that tunnel arch foot owes to dig from mainly there are following measures.File 1 (CN206146313U) discloses one
Kind reduce the cloth pore structure of out break, dense holes and spacer holes arranged along excavation contour line, spacer holes positioned at two dense holes it
Between and the depth of dense holes be more than spacer holes.File 2 (CN205119959U) discloses a kind of combination blasthole for reducing out break,
Arrange that deep hole and shallow bore hole are located at first branch contour line as a pair of combination blastholes, wherein outlet of deep hole in the periphery hole region of face
On, eyeground falls on design excavation contour line, and blast hole depth is identical with reliever blast hole depth；Shallow bore hole aperture is located at first branch profile
Between line and design excavation contour line, eyeground, which falls, to be designed beyond excavation contour line, and blast hole depth is less than the blast hole depth of deep hole,
Blasthole inclination angle is more than the blasthole inclination angle of deep hole.File 3 (" influence and controlling soil moist of the Tunnel Overbreak ＆ Underbreak to tunneling cost ", Jiao Hai
It is bright, Jiangxi building materials, the 5th phase, page 153,160, on March 15th, 2017) it is smart from raising periphery hole jewel hole precision and surveying setting-out
Spend, control measure are angularly proposed using smooth Surface Blasting Technology, reinforcement field management.
Above measure can reduce the out break problem of tunnel perimeter to a certain extent, but complex operation be present, increase explosion
The problems such as used time, while can not preferably solve the problems, such as that digging is owed in tunnel arch foot region, especially (country rock grade is I to hard rock tunnel
~IV grade).Basic reason be above measure from periphery hole this single angle, have ignored bottom plate hole to arch springing explosion imitate
The influence of fruit, cause tunnel arch foot demolition effect poor.
The content of the invention
The purpose of the present invention is to owe complex operation, used time mistake be present in digging measure for existing processing tunnel arch foot region
The problems such as long, less efficient, there is provided a kind of to prevent tunnel arch foot to owe the blasting method dug.
Technical scheme：
A kind of to prevent tunnel arch foot to owe the blasting method dug, step is as follows：
Tunnel arch foot region is divided into three sub-regions：Arch springing porose area, bottom plate porose area and periphery porose area；Described arch springing hole
Area is the region for only including arch springing hole；Described bottom plate porose area is comprising several bottom plate holes and close to the region of arch springing porose area, area
Length of field is not more than 0.5m；Periphery porose area is comprising several periphery holes and is not more than close to the region of arch springing porose area, region height
0.5m；
Described bottom plate porose area is identical with periphery porose area firing order, or bottom plate porose area and periphery porose area are according to sequencing
Detonation, arch springing porose area finally detonate；Arch springing porose area lags behind 100~300ms of last detonation subregion；
The blasthole single hole explosive payload of described arch springing porose area is maximum；
Described arch springing porose area blasthole number is 1, and bottom plate porose area blasthole number is 1~2, periphery porose area blasthole number
For 1~2；
The blasthole spacing for each blasthole that described tunnel arch foot region is included is no more than 0.35m.
The described Millisecond delay method of ignition is the other non-electric shock conducting tube detonator method of multistage, or using other using different sections in hole
Detonator, or change delay time size using detonator outside hole.
Beneficial effects of the present invention：It is not required to by other special equipments, only relying on existing pusher leg drill can be real
Existing blasthole is laid, simultaneously, it is not necessary to using electric detonator, it is quick-fried that arch springing can be achieved using the other non-electric shock conducting tube detonator of multistage of routine
It is broken.The method that the invention provides is simple to operate, and blasting cost is low, and demolition effect is good.
Brief description of the drawings
Fig. 1 is the steel for shot schematic diagram of the present invention.
In figure：1 arch springing region；2 arch springing porose areas；2-a arch springings hole；3 bottom plate porose areas；
3-a arch springings area bottom plate hole；4 periphery porose areas；4-a arch springings area periphery hole；5 excavation contour lines；
6 bottom plate lines.
Embodiment
It is the specific embodiment of the present invention below, and with reference to accompanying drawing, technical scheme is made further
Description.
Embodiment
IV grade of tunnel surrounding grade, section configuration is semicircle tunnel.Arch springing region 1 is marked on tunnel excavation section,
Detonated using Millisecond delay so that arch springing region 1 lags behind the other region detonations of tunnel excavation section.By tunnel arch foot region 1
It is divided into three sub-regions, respectively arch springing porose area 2, bottom plate porose area 3, periphery porose area 4.Three sub-regions are risen using Millisecond delay
Quick-fried, periphery porose area 4 is with using Ms-13 section non-electric shock conducting tube detonators, priming network design interval 650ms, arch springing hole in the hole of bottom plate porose area 3
Area 2 uses Ms-15 section non-electric shock conducting tube detonators, priming network design interval 880ms, finally detonates.Arch springing porose area 2 lags behind periphery hole
Area 4 and bottom plate porose area 3 detonate, lag time 230ms.The blasthole single hole explosive payload of arch springing porose area 2 is maximum in three sub-regions.It is quick-fried
Broken explosive used is No. 2 rock emulsion explosives.Three sub-regions in arch springing region 1 arrange a blasthole, respectively arch springing hole
2-a, arch springing area bottom plate hole 3-a, arch springing area periphery hole 4-a.
A kind of blasting method for preventing that tunnel arch foot owes to dig comprises the following steps.
A, drilled by design requirement on tunnel cross-section.Drilling parameter is：Using V-cut, cut depth 1.8m；It is auxiliary
Help 0.5~0.6m of pitch of holes, blast hole depth 1.6m；Periphery 0.4~0.5m of pitch of holes, blast hole depth 1.6m；Between bottom plate hole blasthole
Away from 0.7m；Three blastholes of the laying of arch springing region 1, respectively arch springing hole 2-a, arch springing area bottom plate hole 3-a, arch springing area periphery hole 4-a,
Blast hole depth is 1.6m；Arch springing hole 2-a is located at arch springing (excavation contour line 5 and the intersection of bottom plate line 6), 8 ° of blasthole inclination angle, arch
5 ° of pin area bottom plate hole 3-a blastholes inclination angle, laid close to arch springing hole 2-a, the two is respectively positioned on bottom plate line 6 and spacing 0.35m, arch springing
3 ° of area periphery hole 4-a blastholes inclination angle, is laid on tunnel excavation contour line 5, close to arch springing hole 2-a layings and the two spacing
0.3m；
B, detonator and explosive are fitted into blasthole.Blasting parameter is：Keyhole single hole explosive payload 0.9kg, detonator section used
Wei not Ms-1 sections and Ms-3 sections；Via hole single hole explosive payload 0.45kg, detonator section used Wei not Ms-5 sections, Ms-7 sections, Ms-9 sections；
In addition to arch springing area periphery hole 4-a, other periphery hole single hole explosive payload 0.3kg, the other Ms-11 sections of detonator section used；Except arch springing area
Beyond bottom plate hole 3-a, other bottom plate hole explosive payload 0.6kg, detonator section used Wei not Ms-11 sections；Detonator section in the 2-a holes of arch springing hole
Not Wei Ms-15 sections, realize last detonation, single hole explosive payload is 0.9kg；Detonator section Wei not Ms-13 in arch springing area bottom plate hole 3-a holes
Section, single hole explosive payload 0.6kg；In arch springing area periphery hole 4-a holes detonator section not Wei Ms-13 sections, single hole explosive payload is 0.45kg.
C, blasthole is blocked, stemming length is all higher than 0.5m；On line is detonated, and joins mode using cluster, and detonator section Wei the 1st outside hole
Section, the whole excavated section of once detonation.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art changes between hole depth, pitch-row, adjustment priority delay in the technical scope of the present invention
It is included within the scope of the present invention every measure.
Claims (5)
1. a kind of prevent tunnel arch foot to owe the blasting method dug, it is characterised in that tunnel arch foot region is divided into three sub-regions：
Arch springing porose area, bottom plate porose area and periphery porose area；Described arch springing porose area is the region for only including arch springing hole；Described bottom plate porose area
It is to include several bottom plate holes and be not more than 0.5m close to the region of arch springing porose area, zone length；Periphery porose area is to include several weeks
It is lateral opening and be not more than 0.5m close to the region of arch springing porose area, region height；
Described bottom plate porose area is identical with periphery porose area firing order, or bottom plate porose area and periphery porose area rise according to sequencing
Quick-fried, arch springing porose area finally detonates；Arch springing porose area lags behind 100~300ms of last detonation subregion.
2. according to claim 1 prevent tunnel arch foot to owe the blasting method dug, it is characterised in that described arch springing porose area
Blasthole single hole explosive payload it is maximum.
3. according to claim 1 or 2 prevent tunnel arch foot to owe the blasting method dug, it is characterised in that described arch springing
Porose area blasthole number is 1, and bottom plate porose area blasthole number is 1~2, and periphery porose area blasthole number is 1~2.
4. according to claim 1 or 2 prevent tunnel arch foot to owe the blasting method dug, it is characterised in that described tunnel
The blasthole spacing for each blasthole that arch springing region is included is no more than 0.35m.
5. according to claim 3 prevent tunnel arch foot to owe the blasting method dug, it is characterised in that described tunnel arch foot
The blasthole spacing for each blasthole that region is included is no more than 0.35m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710820158.7A CN107504872B (en) | 2017-09-13 | 2017-09-13 | A kind of blasting method for preventing tunnel arch foot to owe to dig |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710820158.7A CN107504872B (en) | 2017-09-13 | 2017-09-13 | A kind of blasting method for preventing tunnel arch foot to owe to dig |
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| CN107504872A true CN107504872A (en) | 2017-12-22 |
| CN107504872B CN107504872B (en) | 2019-03-05 |
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| CN201710820158.7A Active CN107504872B (en) | 2017-09-13 | 2017-09-13 | A kind of blasting method for preventing tunnel arch foot to owe to dig |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114383480A (en) * | 2022-01-26 | 2022-04-22 | 广东爆破工程有限公司 | Blasting construction method for hole-pile method subway station protection main structure |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040060454A (en) * | 2002-12-30 | 2004-07-06 | 코오롱건설주식회사 | Excavation method of tunnel for reducing overbreak and underbreak in tunnel blasting |
| CN103470274A (en) * | 2013-09-17 | 2013-12-25 | 中国神华能源股份有限公司 | Installation construction method of tunnel arch frame |
| CN205119959U (en) * | 2015-11-03 | 2016-03-30 | 山东科技大学 | Reduce and surpass combination big gun hole of owing to dig |
| CN106437774A (en) * | 2016-11-25 | 2017-02-22 | 沈阳建筑大学 | Method of constructing tunnel with single cave and single cover |
| CN106546135A (en) * | 2016-11-05 | 2017-03-29 | 中交航局第四工程有限公司 | A kind of tunnel cross-section excavates control mould |
| CN206146313U (en) * | 2016-10-18 | 2017-05-03 | 山东科技大学 | Reduce and surpass cloth pore structure of owing to dig |
-
2017
- 2017-09-13 CN CN201710820158.7A patent/CN107504872B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040060454A (en) * | 2002-12-30 | 2004-07-06 | 코오롱건설주식회사 | Excavation method of tunnel for reducing overbreak and underbreak in tunnel blasting |
| CN103470274A (en) * | 2013-09-17 | 2013-12-25 | 中国神华能源股份有限公司 | Installation construction method of tunnel arch frame |
| CN205119959U (en) * | 2015-11-03 | 2016-03-30 | 山东科技大学 | Reduce and surpass combination big gun hole of owing to dig |
| CN206146313U (en) * | 2016-10-18 | 2017-05-03 | 山东科技大学 | Reduce and surpass cloth pore structure of owing to dig |
| CN106546135A (en) * | 2016-11-05 | 2017-03-29 | 中交航局第四工程有限公司 | A kind of tunnel cross-section excavates control mould |
| CN106437774A (en) * | 2016-11-25 | 2017-02-22 | 沈阳建筑大学 | Method of constructing tunnel with single cave and single cover |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114383480A (en) * | 2022-01-26 | 2022-04-22 | 广东爆破工程有限公司 | Blasting construction method for hole-pile method subway station protection main structure |
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| CN107504872B (en) | 2019-03-05 |
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