CN107542474B - Tunnel oversized widened section surface controlled blasting excavation construction method - Google Patents
Tunnel oversized widened section surface controlled blasting excavation construction method Download PDFInfo
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- CN107542474B CN107542474B CN201710839644.3A CN201710839644A CN107542474B CN 107542474 B CN107542474 B CN 107542474B CN 201710839644 A CN201710839644 A CN 201710839644A CN 107542474 B CN107542474 B CN 107542474B
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- section
- excavation
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- widened
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 42
- 238000010276 construction Methods 0.000 title claims abstract description 36
- 238000005422 blasting Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 40
- 238000004880 explosion Methods 0.000 claims description 7
- 239000003818 cinder Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a construction method for controlling blasting excavation of an oversized widened section of a tunnel, which is used in the technical field of tunnel construction and comprises the following steps: s10, excavating a common section in advance; s20, after primary support of common section excavation is completed and settlement is stable, carrying out blasting excavation on a widening section, excavating the widening section by adopting a step method, and excavating a vault heightened part of the common section; s30, cutting in from one end of the widening section in a direction inclined to the side wall by a certain angle, advancing, excavating an end wall at the other end by using a smooth blasting method after the end wall is excavated to a design contour line, and then performing primary support; meanwhile, backward excavation is carried out, the method is pushed forward by using a smooth blasting method according to the excavation method of the common section, and then the primary support of the upper step excavation of the widened section is synchronously completed; and S40, finally blasting and excavating the lower step. The method accelerates the excavation progress of the widening section, avoids construction period risks and labor waste, and greatly reduces the construction cost. The construction process is simpler, and the requirement of using under the condition of a shorter widening section can be met.
Description
Technical field
The present invention is used for technical field of tunnel construction, controls Blasting Excavation more particularly to a kind of tunnel super large widened section face
Construction method.
Background technique
With the Large scale construction of the highway in China network of communication lines, and the Large scale construction in oil reserve base in recent years, tunnel
Road design becomes increasingly complex, in order to meet the needs of safety and line equipment installation, the section of widened section therein relative to
Conventional section constantly expands.Especially petroleum pipeline tunnel, conventional section design is smaller, and wants to meet the space of expansion joint
It asks, the ratio standard paragraphs of widened section design broaden one times or more, and height also increases by three or four meters, and it is smaller to widen segment length, more
For a widened section respectively in different positions, this just brings great challenge to constructing tunnel.
For the tunnel for being distributed super large widened section in narrow-bore tunnel, in the construction process, how safely, fast and accurately
Completion widened section excavate, become the emphasis of construction method research.
Conventional tunnel widened section excavation method:
Two side-wall pilot tunnel construction.This kind of method is suitable for the longer situation of widened section, is excavated to and widens to conventional section
Start to use when section, first have to open one section of working face, then start to push ahead, main sequence of construction are as follows: excavates right side base tunnel
Get out of a predicament or an embarrassing situation-one Core Soil top bar of base tunnel top bar one Core Soil in left side gets out of a predicament or an embarrassing situation-right side base tunnel top bar.
Widened section uses the shortcomings that two side-wall pilot tunnel excavation construction:
(1), working procedure is more complicated, is only useful in the longer situation of widened section and uses.
(2), when using the method, conventional section construction will be severely impacted, and cannot achieve cross-operation, to duration shadow
Sound is larger, and causes the work holdup, hence it is evident that increases construction cost.
(3), widened section out break is difficult to effectively control.
Summary of the invention
To solve the above problems, the present invention provides a kind of tunnel super large widened section face control Excavation Blasting method,
Can relatively accurate control Tunnel Overbreak & Underbreak, and accelerate construction progress, reduce construction cost, reduce construction safety risk.
The technical solution adopted by the present invention to solve the technical problems is: a kind of control explosion of tunnel super large widened section face is opened
Cut construction method, comprising the following steps:
S10. conventional section is excavated in advance；
S20. after conventional section excavates just branch completion and settlement stability, widened section Blasting Excavation is carried out, widened section uses
Benching tunnelling method excavates, and first excavates conventional section vault Elevated section；
S30. it is then cut, and pushed ahead with the direction being tilted a certain angle to side wall in one end from widened section, to
It is excavated to after design profile line, the headwall of the other end is excavated using smooth blasting method, then carry out just branch；It reversely opens simultaneously
It digs, is pushed ahead according to the excavation method of conventional section using photoface exploision method, then synchronously complete widened section top bar excavation
Just branch；
S40. last Blasting Excavation is got out of a predicament or an embarrassing situation.
It is further used as the improvement of technical solution of the present invention, in step S10, when Blasting Excavation conventional section, in widened section
Place is appropriate to increase light blast hole camber angle, and excavates reserved notch to widened section.
It is further used as the improvement of technical solution of the present invention, when being excavated using benching tunnelling method, get out of a predicament or an embarrassing situation height take widened section compared with
The height that conventional section is increased.
It is further used as the improvement of technical solution of the present invention, in step S20, when excavating conventional section vault Elevated section,
It first slots, excavates after being excavated to design profile line and then horizontally forward obliquely, finally excavate at the residue of back.
It is further used as the improvement of technical solution of the present invention, and after conventional section vault Elevated section is completed, construction is common
The first branch of section and widened section radian same section.
It is further used as the improvement of technical solution of the present invention, in step S30, from one end of widened section to tilt to side wall
The direction incision at 30 ° of angles, and pushing ahead, not scarfing cinder after explosion, quick-fried heap is carried out it is smooth, as temporary construction platform, with
The propulsion of explosion, platform are constantly increased, and until meeting vault construction height requirement, dig to side wall to the contour line of widened section
When, it carries out other end headwall light and pops diggings, after the completion of excavation at headwall, carry out the first branch in the region, it is complete to supporting at headwall
Cheng Hou starts reversed excavation, is excavated along widened section tunnel contour line, constructed according to smooth Surface Blasting Technology, and strict control is super
It owes to dig, and constructs one section one section of supporting.
It is further used as the improvement of technical solution of the present invention, removes temporary construction platform, carries out Blasting Excavation of getting out of a predicament or an embarrassing situation.
Beneficial effects of the present invention: then the present invention presses specific process excavation widened section by excavating conventional section in advance
New process has the advantage that
(1), it accelerates widened section and excavates progress, avoid duration risk, avoid the work holdup.
(2), the control of the out break of contour line and headwall is fairly proper.
(3), existing machinery equipment can be made full use of, construction cost is greatly reduced.
(4), working procedure is fairly simple, uses in the case where can satisfy shorter widened section.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings:
Fig. 1 is that widened section vault Elevated section of the present invention excavates schematic diagram；
Fig. 2 is widened section side wall excavation construction schematic diagram of the present invention；
Fig. 3 is widened section side wall sequence of excavation figure of the present invention.
Specific embodiment
Referring to figs. 1 to Fig. 3, that show the specific structures of the preferred embodiments of the invention.It will be detailed below this
Invent the design feature of each element, and when if there is being described to direction (upper and lower, left and right, before and after), it is with knot shown in FIG. 1
Structure is reference description, but actual use direction of the invention is not limited thereto.Widened section described below: in some traffic or
It is arranged in pipeline tunnel, is used as one or more local sections of emergency lane or equipment installation space relative to common disconnected
The tunnel section that face size is widened or increased.
The present invention provides a kind of tunnel super large widened section faces to control Excavation Blasting method, comprising the following steps:
S10. conventional section is excavated in advance, suitably increases light blast hole camber angle at widened section, and excavate in advance to widened section
Stay notch；
S20. after conventional section excavates just branch completion and settlement stability, widened section Blasting Excavation is carried out, widened section uses
Benching tunnelling method excavates, and height of getting out of a predicament or an embarrassing situation takes widened section compared with the height that conventional section is increased, and first excavates conventional section vault Elevated section,
When excavating conventional section vault Elevated section, referring to Fig. 1, first slot obliquely, the then water after being excavated to design profile line
It is flat to excavate forward, finally excavate at the residue of back, after conventional section vault Elevated section is completed, construction conventional section with widen
The first branch of section radian same section；
S30. referring to fig. 2, Fig. 3, cut from one end of widened section with the direction for tilting 30 ° of angles to side wall, and push ahead,
Not scarfing cinder after explosion, the progress of quick-fried heap is smooth, and as temporary construction platform, with the propulsion of explosion, platform is constantly increased, until
Meet vault construction height requirement, when side wall is digged to the contour line of widened section, carries out other end headwall light and pop digging, wait hold
After the completion of excavating at wall, the first branch in the region is carried out, after the completion of supporting at headwall, starts reversed excavation, along widened section tunnel
Contour line is excavated, and is constructed according to smooth Surface Blasting Technology, strict control out break, and is constructed one section one section of supporting；
S40. temporary construction platform is finally removed, Blasting Excavation of getting out of a predicament or an embarrassing situation is carried out.
Then the present invention presses the new process that specific process excavates widened section by excavating conventional section in advance, have following excellent
Point:
(1), it accelerates widened section and excavates progress, widened section is excavated can be avoided pair with common section supporting with crossed construction
The influence of duration avoids duration risk, avoids the work holdup.
(2), the control of the out break of contour line and headwall is fairly proper.
(3), existing machinery equipment can be made full use of, construction cost is greatly reduced.
(4), working procedure is fairly simple, uses in the case where can satisfy shorter widened section.
Certainly, the invention is not limited to above embodiment, and those skilled in the art are without prejudice to originally
Equivalent deformation or replacement can be also made under the premise of spirit, these equivalent variation or replacement are all contained in the application right
It is required that in limited range.
Claims (7)
1. a kind of tunnel super large widened section face controls Excavation Blasting method, which comprises the following steps:
S10. conventional section is excavated in advance；
S20. after conventional section excavates just branch completion and settlement stability, widened section Blasting Excavation is carried out, widened section uses step
Method is excavated, and conventional section vault Elevated section is first excavated；
S30. the then direction incision from one end of widened section to be tilted a certain angle to side wall, and push ahead, wait be excavated to
After design profile line, the headwall of the other end is excavated using smooth blasting method, then carries out just branch；It is reversed simultaneously to excavate, it presses
Excavation method according to conventional section is pushed ahead using photoface exploision method, is then synchronously completed widened section top bar and is excavated just branch；
S40. last Blasting Excavation is got out of a predicament or an embarrassing situation.
2. tunnel super large widened section face according to claim 1 controls Excavation Blasting method, it is characterised in that: step
In S10, when Blasting Excavation conventional section, suitably increase light blast hole camber angle at widened section, and excavate reserved cut to widened section
Mouthful.
3. tunnel super large widened section face according to claim 1 controls Excavation Blasting method, it is characterised in that: use
When benching tunnelling method excavates, height of getting out of a predicament or an embarrassing situation takes widened section compared with the height that conventional section is increased.
4. tunnel super large widened section face according to claim 1 controls Excavation Blasting method, it is characterised in that: step
In S20, when excavating conventional section vault Elevated section, first slot obliquely, it is then horizontal after being excavated to design profile line
It excavates forward, finally excavates at the residue of back.
5. tunnel super large widened section face according to claim 4 controls Excavation Blasting method, it is characterised in that: common
After section vault Elevated section is completed, the first branch of construct conventional section and widened section radian same section.
6. tunnel super large widened section face according to claim 1 controls Excavation Blasting method, it is characterised in that: step
In S30, cut from one end of widened section with the direction for tilting 30 ° of angles to side wall, and push ahead, not scarfing cinder after explosion, it will be quick-fried
Heap progress is smooth, and as temporary construction platform, with the propulsion of explosion, platform is constantly increased, until meeting vault construction height
It is required that when side wall is digged to the contour line of widened section, carries out other end headwall light and pop diggings, after the completion of excavation at headwall,
The first branch for carrying out the region starts reversed excavation, is excavated along widened section tunnel contour line after the completion of supporting at headwall,
It constructs according to smooth Surface Blasting Technology, strict control out break, and construct one section one section of supporting.
7. tunnel super large widened section face according to claim 6 controls Excavation Blasting method, it is characterised in that: remove
Temporary construction platform carries out Blasting Excavation of getting out of a predicament or an embarrassing situation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710839644.3A CN107542474B (en) | 2017-09-18 | 2017-09-18 | Tunnel oversized widened section surface controlled blasting excavation construction method |
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| CN201710839644.3A CN107542474B (en) | 2017-09-18 | 2017-09-18 | Tunnel oversized widened section surface controlled blasting excavation construction method |
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| CN107542474A CN107542474A (en) | 2018-01-05 |
| CN107542474B true CN107542474B (en) | 2019-04-23 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108222950B (en) * | 2018-02-07 | 2020-03-24 | 宁波市交通规划设计研究院有限公司 | Communicating and deviation rectifying method for water diversion and water delivery tunnel under weak and broken surrounding rock geological condition |
| CN109751054B (en) * | 2019-03-27 | 2020-06-12 | 中铁隧道局集团有限公司 | Construction method of U-shaped large-section tunnel |
| CN110924974B (en) * | 2019-11-28 | 2022-03-04 | 云南省建设投资控股集团有限公司 | Construction method of branch tunnel |
| CN111663946B (en) * | 2020-06-03 | 2022-03-22 | 中国水利水电第四工程局有限公司 | Variable-diameter excavation method for cavern |
| CN113338952A (en) * | 2021-07-16 | 2021-09-03 | 中铁二十局集团有限公司 | Construction method for large-section tunnel with turnout line led out from railway tunnel |
| CN113338953A (en) * | 2021-07-16 | 2021-09-03 | 中铁二十局集团有限公司 | Construction method for extra-large section tunnel with turnout line led out from railway tunnel |
| CN114320319B (en) * | 2021-11-09 | 2024-05-03 | 珠海华昕开发建设有限公司 | Construction method for expanding tunnel from minimum section to extra-large section |
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| CN107542474A (en) | 2018-01-05 |
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Effective date of registration: 20220518 Address after: 511400 No. 2502, ganghanghuating No. 1 office complex building, No. 1, Ganghang 1st Street, Nansha street, Nansha District, Guangzhou, Guangdong Patentee after: CHINA RAILWAY GUANGZHOU ENGINEERING GROUP URBAN RAIL ENGINEERING Co.,Ltd. Patentee after: CHINA RAILWAY GUANGZHOU ENGINEERING GROUP Co.,Ltd. Patentee after: CHINA RAILWAY GUANGZHOU ENGINEERING GROUP HARBOR AND SHIPPING ENGINEERING CO.,LTD. Address before: 511458 No. 582, Jingang Avenue, Nansha District, Guangzhou, Guangdong Patentee before: CHINA RAILWAY GUANGZHOU ENGINEERING GROUP Co.,Ltd. Patentee before: CHINA RAILWAY GUANGZHOU ENGINEERING GROUP HARBOR AND SHIPPING ENGINEERING CO.,LTD. |
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Granted publication date: 20190423 |